NH-EL Series - Nortec Humidity

Transcription

Your guide to selecting and specifying Nortec Electrode Humidifiers.
NH-EL
Series
Engineering
Manual
Includes technical specifications,
guidelines, and options for selection
and application of NH-EL electrode
humidifiers.
2577597_A | MAY 2014
Thank you for choosing Nortec.
Proprietary Notice
This document and the information disclosed herein are proprietary data of Nortec Humidity
Ltd. Neither this document nor the information contained herein shall be reproduced, used,
or disclosed to others without the written authorization of Nortec Humidity Ltd., except to the
extent required for installation or maintenance of recipient’s equipment.
Liability Notice
Nortec does not accept any liability for installations of humidity equipment installed by
unqualified personnel or the use of parts/components/equipment that are not authorized or
approved by Nortec.
Copyright Notice
Copyright 2014, Nortec Humidity Ltd. All rights reserved.
Contents
4
40
6
Humidifier
Components
Operation
Humidifier
Installation
Requirements
7
Sequence Of Operation
40
Mounting with Keyholes
8
Drain Cycles
41
Location
10
Cylinders
43
Plumbing
12
User Interface
44
Electrical
45
Steam Distribution Systems
45
Steam Distributors
13
NH-EL Humidifier
Models
45
Duct Distributors
14
Double Unit (150-200 lb/hr)
47
Blower Packs
15
Humidifier Features
48
17
Options
Atmospheric Steam
Distribution Lines
18
Accessories
48
Condensate
20
Humidifier
Specification
51
Control System
Design
20
24
Checklist
Dimensions
50
NH-EL Control Inputs
50
Multi-Mode
29
Model Specifications
51
Analog Controls
32
Sample Specification
55
Digital Control
56
35
Total Humidification
Load
Duct Distribution Control
Design
57
35
Base Humidification Load
Calculating
Space Distribution Control
Design
57
Nortec Online
38
Moisture Content
Equilibrium
59
Remote Fault Option
59
Warranty
38
Condensate Loss
Table of Contents | 3
Humidifier Components
High Water Sensor
Plug
Condensate Return
Fill Cup
Steam Outlet
TEST
NOTE:
NH-EL 005-030
shown, component
location may vary
slightly for other
models.
Control Terminal
Strip
Cylinder Plug
Cylinder
Cylinder Strap
Touch Screen Display
Fill Valve
Auxiliary Drain Switch
On/Off Switch
Drain Canal
Door Interlock Switch
Drain Valve
Driver Board
Contactor
Remote Relay Board
High Voltage
Terminal Block
Integrated Controller
Transformer
TEST
Figure 1: NH-EL Humidifier Components
4 | Humidifier Components
Description of Components
Table 1: Humidifier Components
Plumbing Cabinet
Component
Function of Component
Drains water from cylinder by activating drain valve without software.
Condensate Return
Provides a connection to return condensate to the humidifier.
Cylinder Plug
Power connectors to the electrodes in the cylinder.
Cylinder strap
Reusable strap that securely holds the cylinder in place.
Cylinder
Water reservoir that supports the electrodes in the water.
Prevents contactor from engaging when door is removed (pull out to override
this safety feature while troubleshooting).
Combines cylinder drain water and fill cup overflow into a single drain outlet.
Supports the cylinder, drains water from humidifier, and provides a port for
filling the cylinder from the fill cup.
Drain Canal
Drain Valve
Fill Cup
Fill Valve
High Water Sensor Plug
Steam Outlet
Contactor
Electrical Cabinet
Control Terminal Strip
Driver Board
High Voltage Terminal Block
Integrated Controller
On/Off Switch
Remote Relay Board (option)
Transformer
Provides an air gap for backflow prevention and provides a gravity feed hose
connection to the cylinder via the drain valve.
Controls flow of water into the humidifier.
Used to detect max water level in cylinder.
Connects to atmospheric steam distribution system.
Activated/Deactivates power to cylinder electrodes.
Terminal strip for connecting external controls and blower pack to the
humidifier.
Provides input and output connections to humidifier components.
Primary power connection from the disconnect to the humidifier.
Controls all functions of the humidifier operation, provides a user interface for
configuration of the humidifier.
Switches power On/Off to the humidifier electronics. Note: Turn off humidifier
disconnect to shut off primary power to the humidifier.
Provides wiring connections to dry contacts which switch to indicate that the
humidifier is on, humidifying, needs service, or is in a fault condition.
User interface for configuring the humidifier.
Steps primary voltage down to 24 VAC to power the low voltage electronics.
Humidifier Components | 5
Operation
The NH-EL is an atmospheric steam humidifier that generates steam with heat created from
resistance to an electrical charge between multiple electrodes immersed in water. The NHEL is designed for air humidification with an atmospheric steam distribution system that
Steam Line
vents the generated steam into the conditioned environment.
The electrode steam system produces pure uncontaminated steam with variable output of
Steam Distributor
25% to 100% (inclusive) of the units rated capacity with a stability of +/-5%. Water borne
minerals remain in the cylinder as water evaporates. Minerals are periodically flushed outCondensate Return
through the adaptive cylinder drains. The adaptive drains operate based upon trending unit
Fill Cup
boil down cycles. This allows for better adaption
to various water conditions and ensures
Control Board
Cylinder
that system drains are only carried out when necessary, creating minimum waste water in
Steam Line
order to maintain optimum operating conditions. If not operated for three days the NH-ELOverflow
Current Sensor
High
models drain automatically, this empties the
steam cylinder asWater
a preventative measure to
Sensor
Steam Distributor any excess scale
organic growth. Solid mineral scale electrically insulates the electrodes,
sinks to the bottom of the cylinder. When the
electrodes are
completely
insulated the Electrodes
Contactor
Condensate Return
cylinder is easily removed and replaced.
Fill Cup
Control Board
Cylinder
Drain Valve
Steam Line
Overflow
Drain Canal
Current Sensor
External Air
Gap
High
Water
Sensor
Internal Air
Gap
Steam Distributor
Electrodes
Contactor
Condensate Return
Fill Cup
Fill Valve
Control Board
Cylinder
Drain Valve
Current Sensor
Overflow
Air Gap
Drain Canal
External Air
Gap
Internal Air
Gap
High
Water
Sensor
Electrodes
Contactor
Fill Valve
Drain Valve
Air Gap
External Air
Gap
Drain Canal
Internal Air
Gap
Figure 2: Humidifier Schematic
Air Gap
6 | Operation
Fill Valve
Sequence Of Operation
Automated machinery may operate differently depending upon the various inputs and user
configurable parameters. The sequence of operation detailed below may vary from
observations depending upon the unique operating conditions of each humidifier.
Note: When water in the cylinder makes contact with the energized electrodes, current flows between
the electrodes through the water. The resistance of the water to the electrical current heats the water
and turns it to steam.
1. When the humidifier receives electric input from external controls to produce steam, the
humidifier will display the “Filling” status and power the contactor(s), passing electricity
to the cylinder(s). The current transformer on the Driver Board monitors the flow of
current (amps) to the cylinder for 60 seconds. As the current draw between the cylinder
electrodes equates to the amount of heat and therefore steam produced, the current
draw must be regulated to control steam production.
2. Active monitoring of the current draw will result in one of several possible outcomes, the
two most common are detailed here:
 If the measured current draw is lower than the current draw that equates to the
system demand and the high water sensor is not made, the system operation will
continue to step 3. If the high water sensor is made system operation will skip to step
4.
 If the measured current draw is higher than the current draw that equates to the
system demand but does not exceed 115% of the Full Load Amps, the system
operation will skip ahead to step 5.
Note: Two factors affect the current draw of the cylinder. (1) The surface area of the electrode exposed
to water, greater exposure will increase current draw. (2) The total dissolved solids (TDS) of the supply
water, higher TDS will result in increased conductivity of the water. Low TDS may prevent unit operation.
3. The humidifier will display the “Filling” status. The fill valve will activate and water will
flow into the fill cup. Water from the fill cup flows into the bottom of the cylinder through
a hose connected to the drain valve housing. The humidifier will continue to fill until the
current draw matches the current draw that equates to system demand (100% demand
equates to Full Load Amps) or the high water sensor detects that the cylinder is full.
4. Once the filling/draining cycles have stopped, the humidifier will display the
“Humidifying” status. Water will continue to evaporate reducing the surface area of the
electrodes exposed to the conductive water and therefore the current draw. If the filling
cycle in step 3 was interrupted by the high water sensor activating, system operation will
return to step 2 once the water evaporates below the high water sensor pin. Otherwise
continue onto step 5.
Operation | 7
5. As evaporation of the water continues and the current draw decreases accordingly, the
control software measures the time for the current to decrease across a predetermined
threshold (For further details see Drain Cycles on page 8). One of two outcomes will
result from this measurement. The most common outcomes are detailed here:
 If the time for the boil down cycle is shorter than optimal, the Auto Adaptive Control
System will initiate a drain cycle to replace the high conductivity water in the cylinder
with fresh supply water. The fill valve will be active during these drain cycles to
reduce waste water below 140°F/60°C.
 If the time for this boil down cycle is optimal or longer, the humidifier will not perform
a mineral dilution drain.
6. To maintain steam production, system operation will loop back to step 2.
Drain Cycles
Concentrations of minerals will adhere to the cylinder electrodes, electrically insulating them
and preventing efficient operation and shortening cylinder life. To minimize this while
maintaining efficiency, the humidifier will initiate a draining process that will dilute the
mineral content in the cylinder only when required and only the minimum volume to
maintain optimal operation.
Drain Activation
Once the humidifier has achieved the desired current draw, the water in the cylinder will
evaporate reducing the water level and therefore the current draw. This reduction in current
draw will happen at different speeds depending upon the conductivity and volume of the
water. More dissolved minerals will reduce the resistance of the water and allow for a
smaller volume of water to maintain the same heat production/evaporation rate as a larger
volume of lower conductivity water. The water level change associated to evaporating the
smaller volume of more conductive water will have a greater impact on current draw and
therefore reduce the current draw faster with higher conductivity water. The control board
monitors the time required for the current draw to cross a pre-determined threshold.

If the Actual Time (Ta) for the boil down across the predetermined thresholds is longer
than the predetermined Optimal Time (To), this indicates that the water has not yet
concentrated excessive amounts of minerals and a mineral dilution drain is not yet
required.

If the Actual Time (Ta) is shorter than a predetermined Optimal Time (To) it is indicative
of water that has concentrated an excessive amount of dissolved minerals and a
demineralization drain is initiated (see Figure 2).
8 | Operation
Figure 2: Conductivity Measurement
Drain Volume
The volume of water that must be drained is calculated by the Auto Adaptive Control System.
This algorithm establishes a proportional drain component based on the difference between
the actual time of the latest boil down cycle (Ta) minus an optimal time (To). It then adds an
integral drain component accumulated from previous drain cycles that will increase or
decrease subsequent drain cycles ensuring more stable prolonged operation.
In cases where a long drain is required the Control System breaks the drain time down into
several small drains to prevent a reduction in the humidifier output capacity that would
otherwise result from a long drain. During multi drains the system maintains the fill valve
operation to assist in reducing the drain water temperature below 140°F/60°C and pulses
the drain valve on for each partial drain (see figure 3).
Figure 3: Multiple Short Drains
Operation | 9
Cylinders
A cylinder is the water reservoir for the humidifier. It consists of a plastic canister with a
steam outlet, water inlet/outlet with strainer, separators and mounts for various electrodes
to be immersed into the water. The NH-EL humidifiers ship with the standard cylinder
indicated in Table 8 and Table 9 on page 29. The standard cylinder has been developed for
optimum performance in the conductivity range of most potable water systems 330 – 670
µSiemens(µS). If required, the humidifier is easily adapted to operate with water
conductivities outside this ideal range. This allows for operation with a total range of 1501250 µS.
Consult with factory for details on adapting the humidifiers operation to accommodate water
conductivities outside the standard operating range.
Low Conductivity Cylinder - For improved operation on potable water between 150 and 330
µS, select a lower conductivity cylinder. (Alternative not available for 208-277v units with
exception for 200 series cylinders)
High Conductivity Cylinder - For improved operation on potable water between 670 and
1250 µS, select a higher conductivity cylinder. (Alternative not available for 480-600v units)
Water Conditions Versus Cylinder Life
The atmospheric steam output of the humidifier is pure and clean steam. During operation
the dissolved minerals from the water supply are left behind in the cylinder. Many of these
minerals will be removed during periodic flush cycles of the cylinder (for drain frequencies
see Drain Cycles on page 8). Figure 4: Water Condition Versus Cylinder Life and Drains generalizes the effect of water hardness, and demand on cylinder life. Cylinder life is
ultimately determined by the water chemistry, the unit running time, and output capacity
setting.
Cylinder Life Expectancy
Capacity Adjustment Setting
100%
50%
25%
400
200
10
CaCO mg /L (p pm)
Grains of Hardness
20
Conductivity of Water (µS/cm)
500
700
1000
600
800
500
600
400
400
300
200
200
100
100
5
500
1000
2000
4000
8000
Average Operating Hours
Note: Other parameters may affect cylinder life.
0
0%
20%
40%
80%
0
100%
Drain Rate as a Percentage of Steam Output
Figure 4: Water Condition Versus Cylinder Life and Drains
10 | Operation
60%
Total Dissolved Solids (ppm)
30
Nortec Electrode Drain Rates vs Water Conductivity
with Auto-Adaptive Control
900
1200
800
Output Versus Cylinder Life
Percent Of Full Steam Output
The NH-EL series humidifier maintains full output capacity for the full life of the cylinder.
Figure 5: Output Versus Cylinder Life illustrates the expected end of cylinder life
performance. As minerals build-up on the electrodes in the cylinder, the patented AutoAdaptive Control System automatically raises the water level slightly in the cylinder. This
exposes fresh electrode surface to water and maintains peak output and efficiency from the
humidifier. Once the electrode surface is completely electrically insulated the user is alerted
to change the cylinder. Other humidifiers’ performance may degrade gradually as the
minerals adhere to the cylinder. By increasing the water level to expose fresh electrode
surface, the NH Series will maintain maximum output throughout cylinder life.
100%
80%
The nortec humidifiers maintain
full output throughout its life.
60%
Typical output of other types of
humidifiers. Ability to produce
steam decreases throughout its
life.
40%
20%
0%
NEW 3/4
1/2
1/4 REPLACE
Cylinder Life
Figure 5: Output Versus Cylinder Life
Operation | 11
User Interface
The NH-EL controller provides a large interactive touchscreen display, integrated digital
communication protocols for building management system connectivity (BACnet, Modbus),
and Internet monitoring via Nortec Online (NortecOnline.com). See Nortec Online on page
55 for more information.
Provides status
information as well
as a user interface
for configuring the
humidifier.
Status LED
Single LED changes
color to indicate status.
(Can be used to drain
cylinder without software)
On/Off Switch
(Turns humidifier On/Off)
(prevents contactor from
engaging when door is open)
NOTE: Pull out with door off
to override.
Figure 6: User Interface
The Touch Screen Display - Allows for easy configuration of all features of the NH-EL
humidifier and provides information indicating operating status, configurations, trend graphs
and data of recent operation, service and fault messages, and troubleshooting information.
One of the key features of the NH-EL controller is tracking operation and providing
information about service requirements to make the humidifier easy to service and
maintain.
12 | Operation
NH-EL Humidifier Models
The NH-EL is available in two different models; The standard model with distributor sold
separately, and the “Space” model which comes with a blower pack distributor system
attached directly to the top of the humidifier that facilitates direct humidification of the
conditioned environment (See Figure 7: NH-EL Models). The NH-EL models come in
capacities ranging from 5 lb/hr (2 kg/hr) to 200 lb/hr (90 kg/hr). For capacities exceeding
200lb/hr, up to 16 humidifiers can be linked together to operate from one set of control
signals. NH-EL humidifiers are packaged in three different cabinets depending upon
capacity. Table 8 on page 29 provides specifications for the NH-EL product line.
NH-EL Space 050-100
NH-EL Space 010-050
NH-EL 010-050
NH-EL 050-100
NH-EL 150-200
Figure 7: NH-EL Models
Humidifier Models | 13
Double Unit (150-200 lb/hr)
NH-EL double units have two cylinders. The construction and installation of double units is
identical to units with a single cylinder with the following exceptions:


Two Cylinder units have two fill/drain connects and two driver boards (designated A and
B). One driver board controls each cylinder (see Figure 7: NH-EL Models).
Double units can operate both cylinders in sequence or parallel from a single set of
control signals or independently based on two sets of control signals.
Independent Operation – Each cylinder will operate independent of the other. Two sets of
controls must be provided, one for each cylinder. Control wiring for each cylinder must be
connected to the cylinder’s corresponding driver board/terminal strip.
Parallel Operation – Both cylinders will respond equally to one set of controls. The control
wiring must be connected to the A driver board/terminal strip.
Sequence Operation –Both cylinders will respond in a staged fashion to one set of controls.
Cylinder A’s output range is 0-100% of demand and Cylinder B’s output range is 50-100% of
demand. The advantage of this configuration is that it allows the unit to achieve the lowest
steam output of single control configurations by disabling one cylinder entirely and ramping
down to the minimum 25% output capacity of the other cylinder.
14 | Humidifier Models
Humidifier Features
The NH-EL includes many advanced features that set it apart from other humidifiers. The
following list outlines some of the NH-EL series features. For help in determining selection
options use the Specification Checklist on page 20.
Table 2: NH-EL Features
Feature
Touch screen interface
Digital graphic display
On/Off control
Control and User Interface Features
Up to two modulating control
inputs per cylinder.
Integrated PI controller
Demand signal acceptance
Digital communication protocols
BTL certified
Remote Fault Indication
Nortec Online
Independent circuits on multicylinder humidifiers
Status indicator LED
Adjustable units of measure
Manual output adjustment
Description
Provides intuitive interface for configuring
system features and settings. See page 12.
Displays visual feedback on the humidifier
inputs (conditioned environment humidity
and set-points). See page 12.
Provides the capability of regulating system
operation with simple on/off controls. See
page 50.
Allows modulating humidifier output to
improve accuracy of supply humidity. See
page 54.
Provides direct compatibility with humidity
transducers ( RH sensor) with adjustable set
points and P/I parameters. See page 50.
Provides direct compatibility with modulating
demand signals. See page 50.
Allows for BMS interface with integrated
BACnet IP/MSTP and Modbus protocols. See
page 55.
Provides BTL certified BACnet IP/MSTP &
enables use of Lonworks. See page 55.
Allows dry contact feedback on unit
operation. See page 59.
Complimentary access to the Nortec Online
systems which allow remote access to view
the operational status and history of the
humidifier. See page 57.
Allows for independent control of multiple
humidifier cylinders through a common
control system. See page 50.
Provides quick reference feedback on system
performance. See page 12.
Display settings in Metric or Imperial units of
measure.
Provides the ability to limit the maximum
steam production of the humidifier.
NH-EL
Standard
Option














Table 2: NH-EL Features (Continued)
Feature
Auto pulse drain valve
Full system drain
Disposable cylinder
Operation and Maintenance
Auto Adaptive control system
Drain water cooling
Extreme drain water cooling
Potable water operation
Foam detection
Advanced foam detection
Backflow prevention
Extended fill cup
Safety door interlock switch
Other
Keep Warm Function
Short cycling detection and
correction
Description
Clears potential drain obstructions.
Anti-fungal cylinder drain after three days
with no demand. Time period is adjustable.
Allows for fast, clean, simple service of the
humidifier. See page 10.
Efficient water consumption and humidifier
performance. See page 88.
140°F/60°C tempered drain during normal
and manual operation. See page 88.
120°F/49°C tempered drain during normal
and manual operation.
Compatible with standard potable water
supplies.
Standard foam detection and correction
capability.
Advanced foam detection and correction
capability.
Integrated air gap in fill cup provides
protection for supply water systems.
Allows for operation in excess of 5.5 in. W.C.
See page 47.
Reduces hazards to service personnel.
Provides improved humidifier response time.
Prevents operational problems associated to
seasonal shifts in humidity load
Certified to meet product standards as
C-UL-US Listed
detailed by Underwriters Laboratories.
Provides guarantee against manufacturer
Warranty
defects. See Warranty on page 60.
Allows for distribution to the conditioned
Choice of steam distribution*
environment directly with the Space model or
indirectly via duct distributors.
Provides convenient means of integrating
Wall Mounting
humidification needs.
*NH-EL Space model includes distributor.
NH-EL
Standard
Option


















Options
Note: Installation instructions are provided with each option and accessory.
Table 3: NH-EL Options
Availability
Name
Factory
Installed
Field
Install Kit
Application

Blower packs are a distribution system capable of dispersing the
steam created by the NH-EL directly into the conditioned
environment. NH-EL Space models have these blower packs preinstalled with steam lines and condensate drainage. Remotely
mounted blower packs are also available. See page 46 for more
information.
Remote Fault
Indication

Provides a PCB with four low voltage relays that operate
depending upon the humidifier status. Status indicators include;
Power Indication, Humidifying, Service, and Error relays. See
Remote Fault Option on page 59 for more information.
Control Setting
at Factory

Lonworks
Digital
Communication

Built-On
Blower Packs

Provides a humidifier pre-configured for the requested control
signal acceptances prior to leaving the factory. The humidifiers
can be field reconfigured as needed. See page 21.

Allows for digital communication via Lonworks communication
protocol. Digital communication allows for detailed operational
feedback and direct humidifier control. See page 55.

For networks that require BTL certified BACnet digital
communication instead of the integrated non BTL certified
BACnet communication. Digital communication allows for detailed
operational feedback and direct humidifier control. See page 55.
BTL Certified
BACnet Digital
Communication

Aux. Internal
Fusing

Advanced
Foam
Detection


Provides an advanced level sensing control system for monitoring
water levels inside the cylinder. Used to correct/prevent
operational concerns associated with Foaming.
Extreme Drain
Water Cooling


For installations where waste water must be cooler than the
standard 140°F/60°C, this option reduces temperatures below
120°F/49°C.
Fill Cup
Extension

For installations where duct static pressure exceeds 5.5 inches
W.C (1.37 kPa). a fill cup extension kit can increase the maximum
potential operating pressure of the humidifier to 10 inches W.C
(2.49 kPa).
Spare Cylinders

Cylinders are the primary service component. Advisable to keep
spare cylinders on site to ensure minimal down time.
Provides extra internal protection to the humidifier, must always
be used in conjunction with an external fused disconnect. See
Table 5 on page 20 for part number information.
Accessories
Table 4: Common Humidification Accessories
Name
Related
Documentation
Application
External
Condensate
Cooling
See pg. 47.
Self-actuated and Electric condensate waste water coolers are
available to reduce waste water temperatures below 140°F/60°C to
meet regulations restricting the temperature of hot water that can be
fed to drains.
Steam
Distributor
Tubes
2556592
Steam
Distributor
Installation
Manual
Steam Distributor Tubes are used for adding steam into ventilation
ducts. Available in three different steam capacities and various
lengths to suit duct dimensions.
SAM-e/Mini
SAM-e
Distributor
Manifolds
1503529 SAMe Engineering
Manual
Remote Blower
Pack
2572641 and
pg. 46.
The SAM-e Steam Distribution Manifolds are used for adding steam
into ventilation ducts larger than 24 in (61 cm) where either higher
steam capacity or short absorption is required. The Mini SAM-e is
available in dimensions under 24 in (61 cm).
Available in a range of sizes and steam capacities to match duct and
humidifier requirements.
Blower packs are used for direct humidification of the conditioned
environment. Capable of dispersing up to 100lb/hr each, blower packs
should be selected to match or exceed humidifier capacity.
On/Off
Humidistats
See pg. 50.
Nortec offers a range of digital and mechanical on/off duct and wall
mounted humidistats for use with control and high limit applications.
Modulating
Humidistats
See pg. 52.
Nortec offers a range of digital modulating duct and wall mounted
humidistats for use with control and high limit applications.
Provides automatic humidistat set point reduction to prevent
humidification that would cause condensation on windows/surfaces
adjacent to outdoor air.
2520263 Duct Mount Temperature Sensor
2553858 Outdoor Mount Temperature Sensor
Outdoor
Temperature
Sensors
See pg. 52.
Humidity
Transducers
See pg. 52.
Nortec offers a range of digital humidity sensors for duct and wall
mounting for use with control and high limit applications.
Air Proving
Switch
See pg. 52.
Provides a mechanical differential pressure switch to enable humidifier
operation when ventilation ducts are operational. Adjustable for
pressures 0.05 - 12” W.C (12.5-2989.1 Pa).
See pg. 47.
Provides a means of adapting steam line diameters to accommodate
longer length steam lines from humidifier outlets to distributor inlet
adapters.
1507846 – Steam Line Reducer 1.75” to 7/8 in. Copper
1508165 – Steam Line Reducer 1.75" to 7/8 in. S.S.
Steam Line
Reducers
Steam hoses are used as steam distribution lines or as couplers to
copper or stainless steel steam distribution lines. When used for
steam distribution the maximum recommended hose length is 10 ft (3
m). Steam hose is available in two sizes.
Nortec Flexible
Steam Hose
Large / Small
Condensate
Trap
See pg. 47.
See pg. 47.
Condensate hose can be used for draining condensate or coupling to
copper or stainless steel condensate lines.
1328810 – Steam Supply Hose7/8 in. ID. per foot (30 cm)
1328820 - Steam Supply Hose 1 3/4 in.ID. per foot (30 cm)
1328840 – Condensate Hose 3/8 in. ID per foot (30 cm)
Condensate traps must be used to remove condensate that forms in
steam distribution lines. Nortec offers copper adapters to the
condensate traps to match its large and small steam hose.
1329634 – Condensate Trap Small 7/8 x 7/8 x 3/8
1329635 – Condensate Trap Large 1 3/4 x 1 3/4 x 3/8
In-Line Water
Filter and
Replacement
Filters
N/A
Inline water filter for supply water which contains sediment that could
obstruct the fill valve strainer or drain fittings.
1329505 - In-Line Water Filter 5 Micron Filter
1329561 - Replacement Water Filters 1 Micron
1329506 - Replacement Water Filters 5 Micron
Condensate
Pump
N/A
High temperature condensate pump for pumping waste water from the
NH-EL or condensate from the distributor systems.
1429527 - Drain Water Sump Pump, low flow
Drain Air Gap
Reducer
Pocket HygroThermometer
digital display
Transformer,
Plug In, 120
VAC to 24 VAC
See pg. 43
N/A
N/A
All NH-EL humidifiers require an air gap on the drain line as close as
possible to the humidifier. This air gap reducer is a copper 2:3/4 in.
(19.05:50.8mm) OD fitting that can provide the drain air gap.
2522172 - External Drain Air-Gap Reducer
The pocket hygro thermometer provides a means for easily checking
the humidity and temperature in a space. Useful tool for
troubleshooting humidity problems.
1469595 - Pocket Hygro-Thermometer Digital Display
“Wall Wart” AC adapter 120 VAC to 24 VAC 40VA for providing power
to remote electronics/controls.
1603032 - Transformer, Plug In, 120 VAC to 24 VAC
Humidifier Specification
Checklist
The following checklist can be used to specify the NH-EL Series Humidifier. It is strongly advised
to use the free Nortec H.E.L.P. software (www.NortecHELP.com) to assist in humidifier sizing
and accessory selection.
Humidifier
Humidifier Capacity - See Total Humidification Load on page 35. Select a humidifier, or
combination of humidifiers that exceeds the total humidification load.
 005 lb/hr
 010 lb/hr
 020 lb/hr
 030 lb/hr
 050 lb/hr
Quantity:
Quantity:
Quantity:
Quantity:
Quantity:
 075 lb/hr Quantity:
Humidifier Electrical - See on Table 3 on page 17.
Voltage:
Phase:
Disconnect:
Humidifier Part Number:
Cylinder - Optimise performance with the correct cylinder for supply water conductivity.
 Standard (330-670µS)
 Low Conductivity (150-330µS)(alternative not available for 208-277v units)
 High Conductivity (670-1250µS)(alternative not available for 480-600v units)
Optional Aux. Internal Fusing – Supplemental overcurrent protection.
(Not a substitute for an external disconnect).
Part Number:
3 Phase
1 Phase
Table 5: Aux. Internal Fusing Part Numbers
Capacity
005
110-120V
2574100
208V
220-240V
277V
380V
440-480V
550-600V
010
2574101
2574101
2574101
2574102
2574102
2574102
020
2574104
2574105
2574105
2574106
2574106
2574106
020
2574103
2574103
2574107
2574107
2574107
030
2574108
2574108
2574109
2574109
2574109
050
2574110
2574110
2574111
2574112
2574112
075
2574113
2574113
2574114
2574115
2574116
100
2574117
2574117
2574118
2574118
2574119
150
2574120
2574120
2574121
2574122
2574123
200
2574124
2574124
2574125
2574125
2574126
20 | Humidifier Specification
Extreme Drain Water Cooler – Used to reduces waste water to below 120°F/49°C
 2574078 – Factory installed for NH-EL 005-020lb/hr
 2574080 – Factory installed for NH-EL 030 lb/hr
 2574082 – Factory installed for NH-EL 050-075 lb/hr
Other Options - For more NH-EL options see Table 3 on page 17.
 Remote Fault Indicator (see page 59) – to provide remote operational feedback
 Advanced foam detection – for use with softened water.
 In-line water filters (see Table 4 on page 18)
Controls
Humidifier Control Signal Acceptance - Optional factory configuration of controls. Factory
configuration eliminates the need to reconfigure the NH-EL in the field. See NH-EL Control
Inputs on page 50.
Part No:
Table 6: Control Acceptance – Part Numbers
Signal
0-5 VDC
0-20mA
4-20 mA
0-10 VDC
0-16 VDC
1-5 VDC
2-10 VDC
0-20 VDC
Demand Acceptance
Transducer Acceptance
Single Channel
Dual Channel
Single Channel
Dual Channel
2523060
2523062
2523064
2523066
2523090
2523092
2523094
2523096
2523061
2523063
2523065
2523089
2523091
2523093
2523095
2523097
2523100
2523102
2523105
2523110
2523112
2523114
2523116
2523118
2523101
2523104
2523107
2523111
2523113
2523115
2523117
2523119
Humidity Controls – Required for automated regulation of humidifier operation. See Control
System Design on page 50.
 Air Proving Switch – Required for humidification into ventilation ducts/air handlers.
 1603032 Optional Transformer, Plug In, 120 VAC to 24 VAC (see Table 4 on page
18).
 2520263 Duct mount outdoor temperature setback sensor – prevents window
condensation.
 2553858 Exterior mount outdoor temperature setback sensor – prevents window
condensation.
Control Humidistat Part No:
High Limit Humidistat Part No:
Humidifier Specification | 21
Table 7: Nortec Humidistats
Demand
Part Num.
Duct
Mount
2548732
2548731
2520273*
1510142
2520266*
1329102
1329108
1509858
1509857

Wall
Mount




Transducer
Duct
Mount
Wall
Mount
Digital
Mech.






0-10
VDC
2-10
VDC








On/Off
Fan
Start













*Remotely mounted digital controller included to provide ease of access.
Digital Communication Protocol – For interface with building automation systems(see Digital
Control on page 55 or Nortec document 2574199 BACnet/Lonworks Supplemental manual).
 BACnet IP/MSTP (Standard)
 Modbus (Standard)
 Nortec Online (Standard)
 2574194 BACnet Tested Laboratories certified BACnet IP – For BTL certified networks
 2574193 BACnet Tested Laboratories certified BACnet MS/TP – For BTL certified
networks
 2574194 Lonworks
Steam Distribution
Select a distributor that exceeds the production capacity of the humidifier(s), fits the duct/air
handler size (if applicable), and accommodates the steam outlet connections to the humidifier.
Options - See Steam Distribution Systems on page 45.
 1710010 –140°F/60°C Self-Actuated Condensate Cooler.
 1710020 – 140°F/60°C 24V Electric Condensate Cooler.
 2572615 – Remote blower pack 005-100lb/hr, 110-120V, 1 Phase.
(see Blower Packs on page 46)
SAM-e (See 1503529 SAM-e Engineering manual for selection information)
Steam Inlet Adapter:
SAM-e Header:
Steam Tubes:
Quantity:
 Insulation (Improves energy efficiency by as much as 70%)
 Mounting Frame (required for vertical duct installation)
Steam Distributor (See 1506117 Steam Distributor Installation manual)
Part Number:
Quantity:
Steam Hose (See Atmospheric Steam Distribution Lines on page 47.)
 1328810 Hose 7/8 in. ID.
 1328820 Hose 1 3/4 in. ID.
 1328834 Hose 3/8 in. ID.
Steam Tube Length:
Steam Tube Length:
Condensate Tube Length:
Steam Line Reducers (For adapting the steam line diameter to various fittings)
 1507846 –1¾ to 7/8 in. Copper
 1508165 - 1¾"o 7/8 in. Stainless Steel
Quantity:
Quantity:
Steam Line Tee (For steam line condensate drainage)
 1329634 – Small Tee adapter 7/8 x 7/8 x 3/8
 1329635 – Large Tee adapter 1 3/4 x 1 3/4 x 3/8
Quantity:
Quantity:
Humidifier Specification | 23
Dimensions
Figure 8: NH-EL 005-030 Physical Data & Dimensions
Humidifier Specifications | 25
Empty Weight
005-010
Full Weight
020
030
Water Inlet Pressure
Clearance Front
Clearance Left and Right
Clearance Floor
Clearance Ceiling
83lbs (38kg)
93 lbs (42kg)
103lbs (47kg)
118lbs (54kg)
30-80 PSI (2.07 – 5.52 BAR)
Blower Pack Speed Setting
LOW
HIGH
132in.
120in.
(355.3cm)
(305cm)
12in.
12in.
(30.5cm)
(30.5cm)
12in.
12in.
(30.5cm)
(30.5cm)
24in.
24in.
(61cm)
(61cm)
Clearances based upon 72°F (22.2°C), 43% RH with
blower on High speed setting. See Location on page 41.
Figure 11: NH-EL Space 005-030 Physical Data & Dimensions
Empty Weight
Full Weight
Water Inlet Pressure
Clearance Front
Clearance Left and Right
Clearance Floor
Clearance Ceiling
123lbs (56kg)
188 lbs (85kg)
30-80 PSI
(2.07 – 5.52 BAR)
Blower Pack Speed Setting
LOW
HIGH
Not
248in.
recommended
(630cm)
Not
30in.
recommended
(76cm)
Not
24in.
recommended
(61cm)
Not
36in.
recommended
(91cm)
Clearances based upon 72°F (22.2°C), 43% RH with
blower on High speed setting. See Location on page 41.
Figure 12: NH-EL Space 050-100 Physical Data & Dimensions
Model Specifications
Table 8: NH-EL Specifications
Phase
Capacity
lb (kg)
5 (2.3)
10 (4.5)
1
20 (9)
20 (9)
30
(13.5)
3
50
(22.5)
75 (34)
100 (45)
Voltage
NH-EL
Part No.
Amps
Max Ext
Fuse
KW
Standard
Cylinder
110-120
208
220-240
277
380*
440-480
550-600
208
220-240
277
380*
440-480
550-600
208
220-240
380*
440-480
550-600
208
220-240
380*
440-480
550-600
208
220-240
380*
440-480
550-600
208
220-240
380*
440-480
550-600
208
220-240
380*
440-480
550-600
2573379
2573380
2573382
2573383
2573384
2573385
2573386
2573388
2573389
2573390
2573391
2573392
2573393
2573394
2573395
2573396
2573397
2573398
2573399
2573400
2573401
2573402
2573403
2573404
2573405
2573406
2573407
2573408
2573409
2573410
2573411
2573412
2573413
2573414
2573415
2573416
2573417
2573418
15.9
18.3
15.9
13.7
9.8
7.9
6.3
36.6
31.7
27.5
19.7
15.9
12.7
21.1
18.3
11.4
9.2
7.3
31.7
27.5
17.1
13.7
11.0
51.9
45.0
28.4
22.4
18.0
77.9
67.4
42.6
33.8
27.0
94.4
90.0
56.8
45.0
36.0
20
25
20
20
15
15
15
45
40
35
25
20
20
30
25
15
15
15
40
35
25
20
15
70
60
40
30
25
100
90
60
45
35
125
125
80
60
45
1.9
3.8
3.8
3.8
3.8
3.8
3.8
7.6
7.6
7.6
7.6
7.6
7.6
7.6
7.6
7.6
7.6
7.6
11.4
11. 4
11.4
11.4
11.4
18.7
18.7
18.7
18.7
18.7
28.1
28.1
28.1
28.1
28.1
34.0
37.4
37.4
37.4
37.4
202
202
202
202
203
204
204
321
321
321
305
309
309
303
303
311
311
311
421
421
407
411
411
621
621
603
605
605
621
621
603
605
605
621
621
603
605
605
* 50 Hertz, not UL listed
Fill
gal (l)
per min
0.13 (0.5)
0.13
(0.5)
Net/Full
Weight
lb (kg)
45/55
(21/25)
0.13
(0.5)
45/65
(21/30)
0.13
(0.5)
0.3
(1.2)
45/80
(21/37)
0.5
(2.0)
0.5
(2.0)
85/150
(39/68)
0.9
(3.3)
** Per cylinder basis.
Table 8: NH-EL Specifications Continued
Phase
Capacity
lb (kg)
150 (68)
3
200 (90)
Voltage
NH-EL
Part No.
Amps
Max Ext
Fuse
KW
Standard
Cylinder
208
220-240
380*
440-480
550-600
208
220-240
380*
440-480
550-600
2573419
2573420
2573421
2573422
2573423
2573424
2573425
2573426
2573427
2573428
155.8
135.0
85.2
67.4
54.0
188.7
180.0
113.7
90.0
72.0
200
175
110
90
70
250
225
150
125
90
56.1
56.1
56.1
56.1
56.1
68.0
74.8
74.8
74.8
74.8
621
621
603
605
605
621
621
603
605
605
** Per cylinder basis.
Fill
gal (l)
per min
Net/Full Weight
lb (kg)
0.5**
(2.0**)
120/245
(55/112)
0.9**
(3.3**)
Table 9: NH-EL Space Specifications
Phase
Capacity
lb (kg)
5 (2.3)
1
3
Volts
110-120
208
220-240
277
10 (4.5)
380*
440-480
550-600
208
220-240
277
20 (9)
380*
440-480
550-600
208
220-240
380*
20 (9)
440-480
550-600
208
220-240
30
380*
(13.5)
440-480
550-600
208
220-240
50
380*
(22.5)
440-480
550-600
208
220-240
380*
75 (34)
440-480
550-600
208
220-240
380*
100 (45)
440-480
550-600
NH-EL
Space
Part No.
2573429
2573430
2573431
2573432
2573433
2573434
2573435
2573436
2573437
2573438
2573439
2573440
2573441
2573442
2573443
2573444
2573445
2573446
2573447
2573448
2573449
2573450
2573451
2573452
2573453
2573454
2573455
2573456
2573457
2573458
2573459
2573460
2573461
2573462
2573463
2573464
2573465
2573466
Amps
17.2
19
16.5
14.2
10.2
8.2
6.6
37.3
32.3
28
20.3
16.2
13
21.8
18.9
11.9
9.5
7.6
32.4
28.1
17.8
14
11.3
52.6
45.6
28.7
22.7
18.3
78.6
68
43
34.1
27.3
95.1
90.6
57.1
45.3
36.3
Max
Ext
Fuse
25
25
25
20
15
15
15
45
40
35
25
20
20
30
25
15
15
15
40
35
25
20
15
70
60
40
30
25
100
90
60
45
35
125
125
80
60
45
KW
2.1
4
4
4
4
4
4
7.8
7.8
7.8
7.8
7.8
7.8
7.8
7.8
7.8
7.8
7.8
11.7
11.7
11.7
11.7
11.7
18.9
18.9
18.9
18.9
18.9
28.3
28.3
28.3
28.3
28.3
34.2
37.7
37.7
37.7
37.7
StandFill
ard
gal (l)
Cylinder per min
202
0.13 (0.5)
202
202
202
203
204
204
321
321
321
305
309
309
303
303
311
311
311
421
421
407
411
411
621
621
603
605
605
621
621
603
605
605
621
621
603
605
605
Net/Full
Weight
lb (kg)
83/93
0.13
(0.5)
(38/42)
0.13
(0.5)
83/103
(38/47)
0.13
(0.5)
0.3
(1.2)
83/118
(38/54)
0.5
(2.0)
0.5
(2.0)
123/188
(56/85)
0.9
(3.3)
Sample Specification
PART 1 - GENERAL
1.1 Work Included:
a. Nortec NH-EL Series electrode steam humidifier[s] as indicated on drawing[s] and as
indicated on schedule[s].
b. Complete and operable humidification system [which meets applicable building codes]
c. Equipment start-up and project inspection by qualified factory trained representative.
1.2 Quality Assurance:
a. Certifications, C-UL US Listed.
b. ISO 9001-2008.
c. ANSI/NFPA 70 - National Electrical Code.
d. ARI 640, "Standard for Commercial and Industrial Humidifiers.
e. ASHRAE SSPC 135 BACnet
1.3 Related Sections:
a. 23 Mechanical General
b. 23[ ] Piping Installation
c. 23[ ] Control System
1.4 Submittals:
a. Submit product data under provisions of Section 23. Include product description, model,
dimensions, component sizes, rough-in requirements, service sizes, and finishes. Include
rated capacities, operating weights, furnished specialties, and accessories.
b. Submit manufacturer's installation instructions.
c. Submit operation and maintenance data.
d. Submit coordination drawings. Detail fabrication and installation of humidifiers. Include
piping details, plans, elevations, sections, details of components, and dispersion tubes.
Detail humidifiers and adjacent equipment. Show support locations, type of support,
weight on each support, and required clearances.
e. Submit wiring diagrams including power, signal, and control wiring. Differentiate between
manufacturer-installed and field-installed wiring.
f. Submit minimum water quality requirements and water pressure requirements.
1.5 Schedules:
a. Refer to information contained in schedule[s] attached to this specification.
b. Humidifiers to be of type, capacity, and arrangement as listed in schedule[s].
c. Include accessories listed in schedule[s] and those accessories required for type of unit.
ELECTRODE STEAM HUMIDIFICATION SYSTEM - NORTEC MODEL NH-EL
PART 2 - PRODUCTS
2.1 Provide Nortec NH-EL electrode humidifier generating mineral-free, sterile steam from a
potable water supply Packaged unit, wall mounted, atmospheric steam generation using an
electrode steam cylinder[s]. Resistive element technology and boiler steam (pressure
steam) technology not acceptable.
2.2 Unit[s] to be complete with:
a. Touchscreen controller with standard building automation and Online connectivity:
i. Intuitive touchscreen control with color graphic user interface.
ii. Standard building automation communication protocols BACnet IP, BACnet MSTP
and Modbus. Additional hardware required for building automation
communication not acceptable.
iii. Standard Nortec Online connectivity for remote monitoring and factory diagnostic.
iv. Embedded web interface for easy configuration and remote monitoring from any
computer with a web browser over a local area network (LAN) connection.
v. USB interface for new software/feature upload and download of operational
information.
vi. Single or dual channel analog signal acceptance, supporting both demand and
transducer control. Ability to control set point from humidifier control when using
transducer controls.
b. Standard remote monitoring with Nortec Online
i. Integrated hardware and software allows for remote end-user and factory
diagnostic of humidifier(s) via the internet.
ii. Humidifier parameter data and performance trending data can be exported
remotely using the internet.
iii. Humidifier will be accessed via the internet by registering humidifier to
www.norteconline.com. Controls contractor to provide internet access to
humidifier through Ethernet cable with RJ-45 connection.
c. Packaged system with Nortec electrode cylinder technology:
i. Nortec cylinder optimized for humidifier capacity and supply voltage. Cylinder
must have welded seam to ensure watertight and have high water sensor to
prevent overfilling.
ii. Durable powder coated steel cabinet with zero side clearance requirement for
minimal footprint (excluding distribution attachments).
iii. Insulating air gap between plumbing and electrical compartment for increased
electronic reliability.
iv. Standard internal drain water tempering to ensure maximum 140°F [60°C] drain
water. External drain water cooler not acceptable.
v. Integral fill cup with minimum 1-inch [25 mm] air gap to prevent back siphoning.
vi. Full cylinder indication and pre-notification of automatic shutdown at end of
cylinder life.
vii. Automatic pulse feature to clean any obstruction from the drain solenoid valve if
required.
viii. Automatic off-season shut-down [after 3 days of "no call"] will completely drain the
cylinder[s] and automatically restart on call for humidity. Adjustable on/off and
time sequence. Provides extended cylinder life, while ensuring stagnant water
does not remain in the system.
ix. Plumbing door interlock safety switch to allow power interruption when installing
or servicing the humidifier.
d. Nortec Auto-Adaptive Control water management:
i. Advanced water management utilizing the patented Proportional plus Integral
Auto-Adaptive Control system for optimal energy efficiency, water usage and
cylinder life.
ii. 98% thermal efficiency from startup until end of cylinder life.
iii. Drains automatically optimized to water conditions to maximize cylinder and
reduce water usage.
iv.
Modulating output between 20% and 100% of rated capacity.
2.3 Optional Accessories
a. Refer to 'Option schedule'
PART 3 - EXCECUTION
3.1 Installation:
a. Install humidifiers per manufacturers' instructions.
b. Install with required clearance for service and maintenance.
3.2 Accessories:
a. Install accessories in accordance with manufacturer's recommendations.
3.3 Commissioning:
a. Start-up of humidifier to be by factory trained technician.
Total Humidification Load
The total humidification load is the sum of three primary considerations:
Base Humidification Load - The humidification load required to increase unconditioned supply
air, from the worst case scenario, to meet the design requirements for the conditioned
environment. This is typically the largest contributing factor to the total humidification load. See
page 35.
Moisture Content Equilibrium - Materials stored in a conditioned environments may retain
moisture content out of equilibrium with the moisture content of that environment. Depending
upon the hygroscopic principals of the material it may have an equalizing effect on the
environment, thereby increasing or decreasing the relative humidity. See page 38.
Condensate Losses – Convection heat transfer from steam in the steam distribution system will
revert the steam to a liquid state, detracting from the gross humidifier output. See page 38.
Safety Margin –Once all other considerations have been made, it may be prudent to
increase the capacity of the humidifier if the design conditions are going to regularly
keep the unit operating at or near or maximum operational capacity.
Nortec provides a convenient method to calculate the humidification load for any application
with our online program - Humidifier Engineering and Load-sizing Program (H.E.L.P.).
Additionally this program can also assist with absorption distance calculations, selection of
humidifiers, distributors, controls, and accessories. For access to this program please go to:
www.NortecHelp.com
There are tutorials on the use of this program available from the Literature & Media section of
the Nortec website www.Humidity.com. Additional information on the effects of humidity,
calculating relative humidity, load calculations and recommended design conditions can be
found in the Nortec Humidification Load Calculation manual (2553856).
Base Humidification Load Calculating
Total Unconditioned Air Supply Volume
The total volume of incoming unconditioned air per hour, forced and naturally ventilated, must
be determined. The incoming volume depends on the construction of the conditioned
environment and the type of air circulation system used.
Forced Ventilation – Typically, an air handler system will exchange a fixed percentage of
conditioned air for unconditioned air. This unconditioned air is the volume of air that requires
humidification.
Air handler systems vary by design but will rely upon adding or removing volumes of air from a
controlled environment. Air handling systems that add air to the conditioned environment will
have a total forced air volume equivalent to the unconditioned supply air volume. Air handling
systems that exhaust air from the conditioned environment must have at least an equal volume
of unconditioned air reintroduced; That equal volume of unconditioned air will be the total
forced air volume.
Humidification Load | 35
Accounting for Economizer Cycles - Under normal heating conditions the unconditioned supply
air volume is usually relatively small to avoid large heating and conditioning treatments.
However when the economizer cycle is in operation, the unconditioned air volume may be as
high as 100% of the total ventilation. To calculate the humidification load for a system with an
economizer cycle the air ventilation and thermal load must be calculated for each month in
which the economizer mode may operate to determine the highest humidification load.
Natural Ventilation – A system that does not rely upon direct mechanical means to provide air
ventilation to the conditioned environment. Air will ventilate through openings in the building
envelope. The amount of makeup air is calculated based on the volume of the conditioned
space and an estimate of air changes per hour.
Unconditioned Supply Air Moisture
Once the total volume of unconditioned supply air is known, the moisture content of this air
must be determined. To ensure the humidifier capacity will be able to satisfy design conditions,
we must base our calculations off the lowest unconditioned supply air temperatures and
humidity that can be expected on a yearly basis. In applications where the unconditioned supply
air will be drawn from the local atmosphere, Nortec advises utilizing the weather data compiled
by geographic location published by the ASHRAE Climate Data Centre.
Once the lowest temperature for the given geographic location is known, use Table 10 (IP units)
or Table 11 (SI units) on page 37 to determine the moisture (lb) per cubic foot of air at 100%
humidity. Multiply the 100% moisture content by the lowest humidity levels for the geographic
location.
Max Supply Moisture(lb/cu.ft) = The 100% RH moisture content obtained from the tables on
page 37 for the lowest anticipated supply air temperature for the unconditioned air source.
Low Humidity(%) = The lowest anticipated humidity (percentage of Relative Humidity) for the
unconditioned supply air source.
Conditioned Air Moisture
The moisture content for the designed air conditions must be determined. To ensure the
humidifier capacity will be able to satisfy design conditions, we must base our calculations off
the highest desired design air temperatures and humidity.
Once the highest design temperature and highest humidity have been determined for the
application, use Table 10 (IP units) or Table 11 (SI units) on page 37 to determine the moisture
(lb) per cubic foot of air at 100% humidity. Multiply the 100% moisture content by the highest
required humidity levels for the conditioned environment.
Max Supply Moisture(lb/cu.ft) = The 100% RH moisture content obtained from the tables on
page 37 for the highest design air temperature.
Design Humidity(%) = The highest required humidity (percentage of RH) for the design
conditions.
36 | Humidification Load
Base Humidification Load
The base humidification load equates to the difference between the Conditioned Air
Moisture(lb/cu.ft) and Supply Air Moisture(lb/cu.ft) multiplied by the hourly Unconditioned Air
Supply Volume (CFM).
Base Load Base humidification load as determined by calculating the moisture required to bring
the unconditioned supply air to meet the conditioned air requirements.
Supply Air Unconditioned Air Supply Volume in cubic feet of air per hour as obtained from Total
Unconditioned Air Supply Volume on page 35.
Conditioned Air Moisture Conditioned Air Moisture in pounds per cubic foot as obtained from
page36.
Supply Moisture Unconditioned Supply Air Moisture in pounds per cubic foot as obtained on
page 36.
Table 10: Moisture Content of Air at 100% RH (IP units)
°F
-20
-10
-5
0
5
10
15
20
25
30
31
32
33
34
35
36
37
38
39
40
lb/cu.ft
0.0000343
0.0000414
0.0000500
0.0000686
0.0000871
0.000111
0.000141
0.000177
0.000223
0.000279
0.000291
0.000304
0.000316
0.000327
0.000340
0.000353
0.000366
0.000380
0.000394
0.000409
°F
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
lb/cu.ft
0.000424
0.000440
0.000457
0.000474
0.000491
0.000509
0.000527
0.000547
0.000567
0.000587
0.000609
0.000630
0.000651
0.000674
0.000699
0.000723
0.000747
0.000773
0.000800
0.000829
°F
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
lb/cu.ft
0.000857
0.000886
0.000916
0.000946
0.000979
0.00101
0.00104
0.00108
0.00111
0.00116
0.00119
0.00123
0.00127
0.00131
0.00135
0.00139
0.00144
0.00149
0.00154
0.00158
°F
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
lb/cu.ft
0.00163
0.00168
0.00173
0.00178
0.00184
0.00190
0.00195
0.00201
0.00207
0.00213
0.00220
0.00226
0.00233
0.00240
0.00247
0.00254
0.00262
0.00269
0.00277
0.00285
°F
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
120
125
130
135
140
lb/cu.ft
0.00293
0.00302
0.00310
0.00319
0.00328
0.00337
0.00347
0.00356
0.00366
0.00376
0.00387
0.00397
0.00408
0.00419
0.00430
0.00491
0.00559
0.00634
0.00719
0.00812
Table 11: Moisture Content of Air at 100% RH (SI units)
°C
kg/cu.m
°C
kg/cu.m
°C
kg/cu.m
°C
kg/cu.m
°C
kg/cu.m
-30
-29
-28
-27
-26
-25
-24
-23
-22
-21
-20
-19
-18
-17
-16
-15
-14
-13
-12
-11
0.000578
0.000553
0.000540
0.000540
0.000551
0.000573
0.000606
0.000650
0.000704
0.000769
0.000845
0.000931
0.00103
0.00113
0.00125
0.00138
0.00152
0.00167
0.00183
0.00200
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
7
8
9
0.00218
0.00238
0.00259
0.00281
0.00305
0.00330
0.00357
0.00385
0.00415
0.00447
0.00481
0.00516
0.00554
0.00594
0.00636
0.00680
0.00727
0.00777
0.00829
0.00884
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
0.00943
0.0100
0.0107
0.0114
0.0121
0.0129
0.0137
0.0145
0.0154
0.0163
0.0173
0.0183
0.0194
0.0206
0.0218
0.0230
0.0243
0.0257
0.0272
0.0287
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
0.0303
0.0320
0.0337
0.0356
0.0375
0.0395
0.0416
0.0438
0.0461
0.0485
0.0510
0.0536
0.0563
0.0592
0.0621
0.0652
0.0685
0.0718
0.0753
0.0790
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
0.0828
0.0867
0.0908
0.0951
0.0995
0.104
0.109
0.114
0.119
0.124
0.130
0.136
0.142
0.148
0.154
0.161
0.168
0.175
0.182
0.190
Moisture Content Equilibrium
Materials stored in conditioned environments may retain moisture content out of equilibrium
with the moisture content of that environment. Depending upon the hygroscopic principals of
the material it may have an equalizing effect on the environment, thereby increasing
(desorption) or decreasing (absorption) the Relative Humidity (RH) of the surrounding
environment. Any materials stored in the conditioned environment that may emit or absorb
significant moisture from the atmosphere should have the hygroscopic principals of that
material assessed with the manufacturer. Once the severity of this influence is known it should
be incorporated into the total humidification load.
Hygroscopic Regain – is defined as the amount of water a completely dry material will absorb
from the air through desorption or adsorption. Any hygroscopic product that is purchased and sold
by weight must have a carefully controlled environment.
Condensate Loss
Convection heat transfer from steam in the steam distribution system will revert the steam to a
liquid state, detracting from the gross humidifier output. An estimate of the condensate losses
throughout the distribution system should be done to ensure the total humidifier capacity, less
this condensation loss, will still satisfy the total load requirement.
38 | Humidification Load
Distributor Losses - The distributor system is often the largest contributor to condensate losses
in a properly designed distributor system. These losses can be minimized by installing insulation
kits available for most advanced distributors.
The amount of humidification lost to condensation is dependent upon the design of the
distributor system. Reference the engineering guide of the distributor for specific condensation
loss information. Additional information on calculating condensate loss and the savings of
insulating distributors can be found in Nortec white paper “Nortec Stainless Steel Air Gap
Insulation R Value”.
Supply Line Losses – Condensate losses per linear foot can be roughly estimated in a system
with properly designed atmospheric steam lines. Total length of the atmospheric steam line
must be taken into account, that is the sum of linear length of the tube and equivalent length of
every fitting. For equivalent lengths of common fittings see Table 12. Once total equivalent
linear length is determined, Table 13 can be used to estimate the humidifier capacity lost to
supply line losses. For design information on steam lines see Atmospheric Steam Distribution
Lines on page 47.
Table 12: Approximate Equivalent Length of Atmospheric Steam Line Fittings
Nominal tube
Standard
size
90° elbow
0.75” - 0.875”
2 ft
1.5” - 1.75”
3.5 ft
3”
5 ft
4”
8 ft
*Valve in full open position.
Standard
45° elbow
1 ft
1.75 ft
2.5 ft
4 ft
Side-outlet
tee
4 ft
7 ft
11 ft
15 ft
Full Bore Gate
valve*
0.4 ft
0.8 ft
1.1 ft
1.6 ft
Globe valve*
18 ft
34 ft
54 ft
80 ft
Note: Nortec stainless steel air-gap insulation provides one method for reducing a
distributor losses and conserving energy. See Nortec publication 1503529 – SAM-e
Engineering Manual for more information on specifying SAM-e insulation.
Table 13: Approximate Condensate per Foot of Atmospheric Steam Line
Steam
MED-L copper tube
Stainless steel
Steam loss per
capacity
nominal steam line
tube (thickness
foot in
(lbs/hr)*
size
0.065”)
condensation
4-30
0.75”
0.875”
0.06 lbs/ft
30-100
1.5”
1.75”
0.11 lbs/ft
200-300
3”
3”
0.16 lbs/ft
400-660
4”
4”
0.22 lbs/ft
Note: Based on 1” pipe insulation at 3” W.C. duct static pressure.
*Inclusive.
Humidifier Installation Requirements
Caution: The following sections provide an outline of the installation requirements. For
detailed installation instructions refer to Document No. 2570435 NH-EL Installation
Manual
Mounting with Keyholes
1. The NH-EL Series humidifier is wall mounted using keyholes on the back of the cabinetry.
2. Use #12 x 3 in. (7.5 cm) screws mounted into 2x4 studs or better. Two screws are needed for a single
unit (005 to 100lb/hr). Three screws are needed for a double unit (150 to 200lb/hr).
3. Fasten the “L” brackets to the top of the humidifier using the appropriate wood screw into the
mounting studs to secure the unit from any upward motion.
Note: Use screws longer than 3 in. (7.5 cm) if drywall or other spacer is present (supplied by
others).
SPACE
B
A
Insert screws so that
1/4 in. (6 mm) exposed,
hang unit, tighten
screws.
Install “L” bracket
after hanging
humidifier
#12 x 3 in. (7.5 cm)
Wood Screws
Unit Size
5-30
50-100
150-200
Screws
2
2
3
Dim A in (cm)
.
12 (30.5)
16 (40.6)
16 (40.6)
Dim B in. (Cm)
16 (40.6)
SPACE
Figure 13: Mounting With Keyholes
40 | Humidifier Installation
Location
 Mount on a suitable wall or vertical surface. Do not sit the unit on the floor. Allow clearances required
for plumbing and electrical connections.
 Install only in areas with ambient temperature 41-104°F (5–40°C), relative humidity 5 - 95% RH (noncondensing). Blower packs should not be installed near cold surfaces or where dew point may be
reached.
 The humidifier cannot be used as a structural member. All piping connected to the unit must be
supported independently.
 Ensure mounting surface can support the full weight of the humidifier and accessories. Specific
humidifier weights are detailed in Table 8 on page 29 and Table 9 on page 29.
 Install in a location that facilitates regular maintenance and where; electrical, water, drain (with proper
slope), connections can be made to the humidifier.
 When possible, install below the steam distributor. Take care to provide proper steam line routing and
proper condensate traps as per the Steam Distribution section on page 22.
 DO NOT locate the humidifier any further then absolutely necessary from the steam distributor. Net
output will be reduced as a result of efficiency loss of steam lines.
 Clearance dimensions shown are for reference only and are the minimum required for maintenance of
the humidifier. Consult local and national codes before final location and installation. Nortec does not
accept responsibility for installation code violations.
*Side clearance not required, only recommended for ease of service access.
(See Table for
Blowerpack
clearances)
(See Table for
Blowerpack
clearances)
5-95%
(See Table for
Blowerpack
clearances)
6 in.
(15 cm)
Recommended
Side
Clearance
Mount Humidifier
Level
36 in. (91.5 cm)
Min. Front Clearance
If Blowerpack is used,
mount so that the steam
outlet is at least
96 in. (244 cm)
above ground level.
24 in.(61 cm)
Min Height
Figure 14: Installation Location/Clearance
Humidifier Installation | 41
Table 14: Minimum Clearances for Blower Packs
Frontal
Overhead
Left side
Clearance
Clearance
Clearance
Inch (cm)
Inch (cm)
Inch (cm)
5-30 (2.3-13.6)
Low
132 (336)
12(31)
12 (31)
5-30 (2.3-13.6)
High
120 (305)
12(31)
12 (31)
50-100 (22.7-45.4)
High*
248 (630)
36 (91)
30 (76)
Based upon Nominal Conditions 72˚F (22.2˚C), 43% RH.
*Low speed not advised for 100lb/hr.
Supply steam
lbs(kg) per hour
Speed
setting
Right side
Clearance
Inch (cm)
12 (31)
12 (31)
30 (76)
Plumbing
1.2 in. (30 mm). OD
un-threaded outlet
with factory supplied
bent hose and clamp.
Air gap required.
2 1/2 in. to 7/8 in. copper
reducer is ideal.
(NORTEC option P/N 2522172)
Hose must not touch
the bottom of the funnel.
1/2 in. NPT
Use union to connect
supply pipe to unit.
Min. 7/8 in. OD drain line.
Keep as short as possible.
Slope down to floor
drain or main drain.
Increase size if combining
multiple drains as in double unit.
Always install a water
shut-off valve.
*Pipe and water shut-off valve not supplied by NORTEC.
Figure 15: NH-EL Water Supply and Drain Connection
Table 15: NH-EL Supply Water Requirements
Conductivity
(µSiemens)
150-1250*
Hardness Range
(GPG)
Silica Range
(ppm)
Alkalinity Range
(pH)
0-10
0-3
0-4
0-14
7-7.5
*Default humidifier configuration supports approximately 330-670µS





All water supply and drain line connections should be installed in accordance with local
plumbing codes.
Supply cold potable water, not purified water such as reverse osmosis or demineralized. See
Table 8 and Table 9 for supply water flow rates.
Use material suitable for 212°F (100°C) for drain and condensate lines.
The drain line should not end in a sink used frequently by personnel, or where plumbing
codes prohibit. Route to a floor drain or equivalent for safety reasons.
Ensure drain line is adequately sized to provide free and easy draining, an air gap must be
installed as shown. A restricted drain can cause cylinder water to over concentrate and
result in poor operation or result in water backing up at the air gap.
Electrical
Caution: Wiring to be performed by a licensed electrician.
Three Phase NH-EL
Three Phase Supply
Ground
Ground
L1
L2
L3
Neutral
L1
L2
L3
E
X
T
Dedicated
Circuit Breaker
or
Fused Disconect
I
N
T
Single Phase NH-EL
Single Phase Supply
Ground .
Ground
L1
L2
Note:
1 Install a disconnect within view
of the humidifier.
2 Optional internal fuses are not
a substitute for external fuses.
3 Dedicated external fused
disconnect must be installed.
Fusing must not exceed max
circuit protection as indicated
on the specification label.
4 Ensure that adequate power is
available to carry full humidifier
amp draw as indicated on the
specification label.
5 All wiring to be in accordance
with national and local electrical
codes.
L1
L2
E
X
T
Three Phase Supply
(Note: Load will be unbalanced)
Ground
Ground
L1
L2
L3
Neutral
L1
L2
E
X
T
I
N
T
Three Phase Supply
(Note: Load will be unbalanced)
Ground
Ground
L1
L2
L3
Neutral
L1
Neutral
E
X
T
Figure 16: NH-EL Primary Power Connections
I
N
T
I
N
T
.
Steam Distribution Systems
Steam Distributors
The atmospheric steam generated by the NH-EL must be introduced into the conditioned environment to
facilitate humidification. This is accomplished with either Blower Packs mounted directly in the conditioned
environment, or by mounting Duct Distributors into air handlers or supply ducts feeding the conditioned
environment. In all cases the steam distributor must be capable of dispersing equal to, or greater amounts
of steam that the humidifier will produce.
Use the free Nortec online program - Humidifier Engineering and Load-sizing Program (H.E.L.P.)
to assist in distributor sizing and accessory selection. Additionally this program can also assist
with absorption distance calculations, selection of humidifiers, controls, and accessories. For
access to this program please go to: www.NortecHelp.com
Additional information on the effects of humidity, calculating relative humidity, load calculations
and recommended design conditions can be found in the Nortec Humidification Load Calculation
manual (2553856).
Duct Distributors
A variety of duct distributor systems are available to accommodate duct dimensions, humidifier capacities,
and steam absorption distances. To facilitate proper steam absorption and prevent condensation in duct
the following criteria must be met:
 Steam distribution capacity must be equal to or greater than the humidifier steam production capacity,
less steam line condensate losses. Multiple distributors can be utilized as needed.
 There must be laminar air flow in the duct across the distributor. Excessively turbulent air flow may
cause air stream collisions with internal duct walls/components which must be avoided for the
calculated absorption distance downstream.
 The duct air velocity must be greater than 300 fpm to prevent steam migrating to, and colliding with,
the duct ceiling.
 An air proving switch and high limit humidistat must be utilized. See NH-EL Control Inputs on page 50.
 Duct static pressures must not exceed -2” WC to 5.5” WC (-0.5 to 1.37 kPa) or up to 10” WC (2.49
kPa) with fill cup extension.
 Atmospheric steam lines must be installed in order to provide steam from the NH-EL humidifier to the
steam distributor as detailed in Atmospheric Steam Distribution Lines on page 47.
For more information on duct distributor systems see the Nortec reference literature detailed by part
number in Table 16. This literature is accessible from the Nortec website www.Humidity.com.
Table 16: Duct Distributor Models
Duct Dimensions
Model
Steam Capacities
(lb/hr)
Min**
Max**
ASD Tube
BSD Tube
CSD Tube
SAM-e
Mini SAM-e
0-25*
0-35
0-115
Max 1200**
Max 210**
10”
12”
24”
18” X 18”W
8” x 12”W
66”
102”
138”
360” x 360”W
36” x 36”W
*Max 22lb/hr for 10” ASD tubes.
**Available in various standardized configurations.
Nortec
Reference
Literature
2556592
1503529
Blower Packs
Nortec Blower Packs create an air stream to facilitate absorption of the atmospheric steam in the
conditioned environment. Once the steam is absorbed the humidity will disperse evenly throughout most
conditioned environments without the need of further mechanical assistance with exception to;
mechanical obstructions, localized variances in temperature, infiltrating air, or materials that have
equalizing moisture effects on the surrounding atmosphere. See Space Distribution Control Design on
page 57.
Blower Packs are available in two configurations: Remotely Mounted (RM-BP) or Built-On (Space). Each has
two speed settings, High speed provides shorter absorption distances, low speed offers quitter operation
with longer absorption distance. The NH-EL Space model comes preassembled with the Blower Pack with
steam line, condensate drainage, and wiring. This increases the standard installation tolerances of the
humidifier as detailed on page 40.
Figure 17: Blower Pack Configurations
Each Remote Mounted Blower Pack (RM-BP) is capable of supporting 5-100lb/hr. These distribution
methods will require; 120VAC 15 amp power supply, atmospheric steam lines, condensate drainage (See
Atmospheric Steam Distribution Line on page 47). For more information on Blower Packs see Nortec
document 2572641.
*Not to scale
Figure 18: Remote Mounted Blower Pack
Atmospheric Steam Distribution Lines
Atmospheric steam generated by the NH-EL must be introduced from the humidifier to the steam
distribution system to facilitate humidification of the conditioned environment. If the atmospheric
distribution system creates steam pressures outside -2” WC to 5.5” WC (-0.5 to 1.37 kPa), or up to 10” WC
(2.49 kPa) with fill cup extension when combined with duct static pressures, operation of the humidifier
will be impaired. To prevent this, ensure duct static pressures are within range and all steam line designs
utilize the correct; steam line material, diameter, length, slope, insulation, and condensate drainage. For
more steam line design information see the “Steam Lines and Condensate Returns” section of the
2570435 NH-EL Installation Manual.
Material
Only use Notec steam hose, MED-L copper tube, or stainless steel tube that meets the ID requirements
based on humidifier capacity as detailed in Table 17 on page 48. Consult with the manufacturers of the
steam line materials for information on applications with atmospheric steam.
Length
Maximum recommended steam line lengths are detailed in Table 17 on page 48. Minimize the length of
steam lines to reduce efficiency losses to condensate. Table 12 on page 39 provides equivalent length of
some common fittings that can be used when determining the total equivalent length of steam lines. See
Condensate Loss starting on page 38 for information on calculating efficiency losses based on total
equivalent steam line length.
Condensate
Condensate is formed in the steam line and steam distributor systems. Steam lines must be designed to
minimize the condensate created, and to remove any condensate that will otherwise obstruct the free
venting of the atmospheric steam.
Insulation – a minimum 1 in. pipe insulation is recommended to reduce the condensate created as per
Figure 19.
Minimum Slope – Slope the steam line towards condensate drainage traps as per Figure 20. The minimum
slope with the flow of steam is 2°, against the flow of steam the minimum slope is 10°.
Condensate Traps – The distribution line must be drained at all low points and every 15 ft (4.5m) of linear
steam line. Drainage from the steam line is accomplished with full size Tee fittings as per Figure 20.







MAIN RULES FOR ATMOSPHERIC STEAM LINES
Steam lines must not have any restrictions which could cause back pressure or more than 5.5 in.
W.C. when combined with duct static pressure.
Follow recommended materials, size and length (see Figure 17 on page 46).
Only use Nortec steam hose for short steam runs, (<10 ft./3 m) and adapting to the cylinder
steam outlet.
Slope the steam lines and insulate with 1.0 in. (2.5 cm) pipe insulation minimum as indicated in
Figure 19.
Trap condensate using full size ‘T’ for Traps (see Figure 20).
Operate units/tanks in parallel when installing multiple units or double unit to single steam
distributor (See Double Unit (150-200 lb/hr) on page 14).
Flush steam lines and supply water lines after construction.
Use Appropriate Slope
Insulate Pipe
Minimal Slope (up)
10 Degrees
n
Directio
Steam
2 in.
(5 cm)
1 ft (30 cm)
Minimal Slope (down)
2 Degrees
Steam
Directio
Stea
n
m Dir
ection
0.5 in.
(12 mm)
1 in. (2.5 cm) pipe
insulation
1ft (30 cm)
Figure 19: Steam Line Slope and Insulation
Condensate Returns
 Route condensate back to humidifier fill cup where possible. Clean condensate
can be returned to cylinder from the fill cup.
 Condensate should not be routed to a sink used frequently by personnel. Route to
a floor drain or equivalent. Condensate normally cools in traps but is still hot. A
SAM-e or larger steam line generates more condensate and water may not cool in
the trap. A drain water cooler option may be installed if required by code.
 Large volumes of condensate from multiple humidifiers or SAM-e systems should
never be returned to a single humidifier.
 Multiple condensate drain points must be trapped individually prior to coupling
Tee is same size
as steam line
Use a full size tee, not a 90
degree elbow for vertical
to horizontal transitions.
12 in. (30 cm)
min drop to
top of ‘P’ Trap
P Trap min
6 in. (15 cm)
or
duct static
pressure + 2 in
whichever is
greater
‘P’ Traps Use:
- NORTEC 0.375 in condensate hose
- 1/4 in Med-L copper tubing, or
- 0.375 in stainless steel tubing
Minimum Slope.
1 ft (30 cm)
0.25 in
(0.6 cm)
Condensate drains must be sloped down.
Figure 20: Condensate Traps
Table 17: Recommended Steam Line Material*, Maximum Length, Losses
NH-EL
Model
5
10
20
30
50
75/150**
100/200**
5
10
20
30
50
75/150**
100/200**
5-30
50-200**
Maximum Steam
MED-L
Stainless
Possible Steam Losses
Line Length
Copper
Steel
(based on 1” insulated copper pipe)
ft
(m)
Tube
Tube
lb/hr/ft
(kg/hr/m)
7
(2)
12
(3.5)
0.75
0.875 X 0.049W
0.06
(0.09)
17
(5)
22
(6.5)
43
(13)
47
(14)
1.5
1.75 X 0.065W
0.11
(0.16)
50
(15)
Oversized Steam Line (Use for longer steam runs)***
14
(4)
24
(7)
1
1.125 X 0.049W
0.06
(0.09)
34
(10)
44
(13)
86
(26)
94
(28)
2
2.0 X 0.065W
0.11
(0.16)
100
(30)
Nortec Steam Hose
5
(1.5)
Pt No 1328810 (7/8”)
0.1
(0.15)
5
(1.5)
Pt No. 1328820 (1 3/4”)
0.15
(0.22)
Note: *
The use of steam line other than copper, stainless steel tube or Nortec supplied steam line will void the warranty and may adversely affect
the operation of the humidifier
** Use one steam line per cylinder for NH-EL150-200 humidifiers. Do not combine lines except at distributor using a Nortec adapter designed
for that purpose and only if humidifiers are operated in parallel.
*** These diameters require a reducer at humidifier and steam distributor connection
Combining Steam Lines
To combine multiple steam lines from a double unit or from multiple units, always use a Nortec supplied
adapters at the steam distributor. Do not use common steam lines for double units or from multiple
humidifiers. Always operate units or double tank units in parallel. See Double Unit (150-200 lb/hr) on
page 14.
Combine multiple
steam lines at steam
distributor using a
Nortec Adapter
Units must be controlled
in parallel.
Also applies for double
tank models 150/200.
Figure 21: Combining Multiple Steam Lines
Control System Design
The NH-EL is designed to be regulated by an automated control system interfaced to the humidifier’s
control terminal strip, but operation may also be regulated with a computer or building management
system with a compatible digital communication protocol. See Digital Control on page 55 for more
information. Regardless the interface, control components for the conditioned environment will vary
primarily depending upon Duct or Space distribution method. All modulating input signals to the humidifier
must be of a matching type, either transducers (RH Sensor), or humidistats (demand signals). For wiring
use a minimum of 18 AWG and keep as short as possible.
NH-EL Control Inputs
The NH-EL operation can be regulated with Analog Controls supporting up to two modulating inputs and
multiple on/off devices for each cylinder, or with Digital Control using computer or building management
system interface using standard digital communication protocols. For control system designs for the
conditioned environment see Control System Design on page 50.
Note: Regardless of selecting Analog or Digital controls, Nortec humidifiers must have a closed
circuit across the on/off security loop(s) to operate. Nortec highly recommends the use of a
High Limit humidistat and an Air Proving switch for duct installations.
Multi-Mode
The Multi-Mode function allows connection of up to 16 humidifiers to one control signal (Analog or Digital)
to a designated Master unit. Humidifiers can be configured to operate in parallel or to come on in stages
to match demand. Staged configuration of the units will allow for a lower turn down ratio by using the
smallest capacity humidifier as the master. Parallel configuration allows for connections to common
distributor systems and offers more even wear on all units. For more information see Double Unit (150200 lb/hr) on page 14.




Connect up to 16 units (equivalent of 1600 lb/hr) using 18-24 AWG multi-strand, twisted pair,
shielded cable.
Connect humidistats/transducers and security loop to master unit only.
Jump the security loops on slave units.
When connecting double units connect only to driver board A.
Master
Slave 1
Slave X
Daisy Chain
up to 16
Humidifiers
Daisy chain pole 1 and 2
of terminal J10 of the
control board.
Note:
Do not reverse polarity.
Figure 22: Multi Mode Wiring
Analog Controls
All analog controls will interface with the NH-EL on the low voltage control terminal strip. Controls can be
supplied by Nortec or by others. The humidifier will not be capable of steam production until the security
enable/disable loop has been satisfied.
The control signal acceptance can be configured by Nortec at the factory or can be field configured with
the digital touch screen user interface. See Table 6 on page 21 for ordering information for preconfigured
control signal acceptances. Control configurations allow for enable/disable of both modulating inputs as
well as selection from a range of signal acceptances detailed in Table 18.
Table 18: NH-EL Viable Control Signals
Control Type
Control Signal
NH-EL
Modulating
Control/High-Limit
Signals
On/Off
Control/High-Limit
Signals
Demand or Transducer
0-5 V, 0-10 V, 1-5 V, 2-10 V,
0-20 V, 0-16 V, 3.2-16 V,
0-20mA, 4-20mA
Dry Contact
24 VAC or 10 VDC
Dry Contact
24 VAC
On/Off
Security Loop
Double Units - Double humidifiers have two terminal strips and differentiate the controls for each cylinder
with A/B designations as per Figure 7: NH-EL Models on page 13. If controlling double units in Series or
Parallel configuration, only one set of controls will be required to terminal strip A. If controlling with
Independent mode, one set of controls will be required for each terminal strip and each cylinder will
operate independent of the other.
Modulating Control
The NH-EL can be operated with one or two modulating inputs per cylinder. If using two modulating inputs
both signals must be of the same type: Demand signals as provided by an external controller, or
Transducer (RH sensor) signals as provided by an external humidity sensor. In both cases, the humidifier
will not start to produce steam until the calculated system demand exceeds 26%.
Demand Signals When the humidifier receives a demand signal it will calculate the desired steam
production as a percentage of total humidifier capacity proportional to the incoming demand signal as a
percentage of the signal range. When two demand signal inputs are used, the humidifier will respond to
the lowest of the two demand signals.
Transducer Signals When using modulating transducers (RH Sensor), the humidifier will use an internal PI
controller to calculate system demand for each channel input. The calculated system demand for each
input channel will vary depending upon the configurable humidity set points, as well as proportional and
integral functions of the internal controller. If using two transducer signals, two demand signals will be
calculated and the humidifier will respond to the lowest of the two calculated demand signals. Transducers
with a possible zero input are not recommended. The humidifier also supports an optional low and high
humidity alarm warning with reconfigurable humidity triggers.
Safety Control
The NH-EL can be enabled for operation by closing the 24VAC safety loop (pin 1 to pin 2) on the low
voltage control terminal strip. This loop also facilitates on/off control of the humidifier. This security loop
can be used for safety feedbacks that indicate the functional status of the humidification system
components critical to the correct and safe operation of the humidifier.
Digital Control
The digital interface can be configured to control the humidifiers output or can be used to monitor
operation, and change system configurations. Digital communication can be used in conjunction with
Analog controls to regulate the humidifiers operation. With NH-EL humidifiers utilizing the digital
communication features, it is recommended to use transducers for the control and high limit signals.
The NH-EL supports standard communication protocols BACnet IP, MS/TP and Modbus RTU. The desired
integrated communication protocol can be selected and configured using the digital touch screen
interface. With optional hardware kits the humidifier can be adapted to communicate with Lonworks, or
BTL certified BACnet IP/MSTP. See page Table 3: NH-EL Options on page 17 for optional communication
packages and Nortec document 2574199 BACnet/Lonworks Supplemental manual.
BACnet
The NH-EL uses a standard RJ-45 connector and Category (CAT) 5,5E ,or 6 provided by others to connect
to the Integrated Controller board to facilitate BACnet Internet Protocol (IP) and Master Slave Token
Passing (MS/TP) communications. Refer to the Building Management System (BMS) supplier for maximum
recommended communication line lengths. See Nortec document 2574199 – BACnet, LonWorks
supplemental Installation and Operation Manual for control points and connection information.
Modbus RTU
The NH-EL uses a three pole terminal to the Integrated Controller board to facilitate the Modbus EIA-485,
2-wire communications. Connections can be made directly to the provided terminal with the recommended
18-24 AWG Shielded, twisted pair with 120 Ω impedance. Cables of superior quality are also considered
acceptable. To minimize signal loss, a wire run should not exceed 2200 feet (670m). To ensure
communication reliability, it is recommended that no more than 8 nodes are connected to a single
chain/bus. See Nortec document 2560599 – Using Modbus with Nortec Humidifiers for a listing of
Modbus parameters and connection/configuration information available with the NH-EL.
Lonworks and BTL Certified BACnet IP/MSTP
LonWorks and BTL certified BACnet systems require additional optional hardware. See Nortec document
2574199 – BACnet, LonWorks supplemental Installation and Operation Manual for required kits, control
points and connection information.
Duct Distribution Control Design
When distributing into a supply air duct the humidifier system will require an Air Proving Switch, Duct High
Limit, and a Humidity Controller. Environments with outdoor walls should consider the Outdoor
Temperature Setback Sensor.
Figure 23: Duct Control Location
1. Air Proving Device
Steam vented from a duct distributor will require air flow over the distributor in order to be absorbed.
Nortec air proving switches provide normally open dry contact feedback to the humidifiers security loop
that will prevent humidification should the air handler not be operational.
2. High Limit Safety
The high limit will allow for limiting supply air humidity in order to prevent the air from reaching
saturated conditions that lead to water damage. Typically On/Off duct or wall humidistats suffice for this
application, but there are several applications where modulating transducers or humidistats should be
used:
 When using a variable air volume (VAV) air handling system.
 When installing the high limit after a bend or obstruction in the supply duct.
 With very high, or 100% outdoor air applications.
 Installations with short clearances for steam absorption.
Nortec duct humidistats or transducers should be installed 10 ft / 3 m downstream of the duct
distributor system or outside of the calculated absorption distance. Wall mount high limits should be
used for space distribution and should be installed in the conditioned environment avoiding discharge
diffusers, infiltrating air, and localized variations in temperatures.
3. Humidity Control
The Humidity Control will detect the relative humidity in the conditioned environment and provide
feedback to the humidifier. Must be installed in a location representative of the conditioned
environment. Duct controls installed in exhaust or return ducts are preferred. Wall mount controls can
also be installed in the conditioned environment avoiding discharge diffusers, infiltrating air, and
localized variations in temperatures.
The NH-EL is compatible with On/Off or modulating humidistats, and transducers (RH sensors), but
there are several applications where modulating transducers or humidistats should be used:



With very high, or 100% outdoor air applications.
When using economizers or variable air volume air handling systems.
Where narrow humidity tolerances are required.
4. Outdoor Temperature Setback
This should be used to prevent condensation on windows or other surfaces that are adjacent to outdoor
air. Must be installed in an area representative of the outdoor air temperatures such as a fresh air
intake duct or directly outside. For use with Nortec humidistat humidity controller that limits set points
based upon outdoor temperatures. Automatic setback is reconfigurable depending upon insulation
quality of windows, default setback as per Figure 24. See Table 4 on page 20 for more information.
Figure 24: Default Set Point Setback
Space Distribution Control Design
When distributing directly into the conditioned environment the humidification system will require a Control
Humidistat, and a High Limit is recommended. Environments with outdoor walls should use the Outdoor
Temperature Setback Sensor to prevent window sill/wall water damage.
1
Humidity
Control
(in location
representative
of the space)
Figure 25: Space Control Location
Nortec Online
Nortec Online provides the ability to monitor the humidification system remotely. All Nortec NH-EL
humidifiers ship ready to connect to Nortec Online over the internet without the need for additional
gateways or factory installed options. Nortec Online provides humidifier operational status, system
configuration information, fault history, trended steam production, trended control inputs, and trended
humidity readings (with transducers) in addition to e-mail notification of any fault with the humidifier.
Nortec Online also enables factory service technicians to assist facility staff with troubleshooting,
diagnostics, and tuning of the system.
Network Connections
To take advantage of Nortec Online, the humidifier must be physically connected to the internet through a
network (by others). The Nortec Online connection must then be enabled and the humidifier registered to
a user account on NortecOnline.com. Multiple humidifiers can be connected to the same network,
although each must be configured with an individual IP address.
Figure 26: Nortec Online
Wired connections are recommended for optimal reliability and quality of the connection. Wireless (“wifi”)
connections can be achieved through the use of a Wireless Bridge, provided by others. Refer to the
documentation provided with the bridge for configuration and setup. See Nortec publication 2553430 –
NH-EL Online Installation Manual for detailed information about Nortec Online.
Remote Fault Option
The NH-EL remote fault option includes 4 relays that can provide remote status indication. The relays are
mounted to a remote fault board which is located as shown in Figure 27. The PCB with the relays includes
markings which indicate the function of each terminal on the board. The relays indicate the following
status:
Unit On
The normally open relay is closed when the humidifier has power and the On/Off switch is
set to On.
Steam
The normally open relay is closed when the control board detects that the cylinder is drawing
current and steam is being produced.
Service
The relay can be wired to open (NC) or close (NO) when a warning is displayed on the
humidifier display and the yellow service LED is illuminated.
Error
The relay can be wired to open (NC) or close (NO) when a fault is detected by the humidifier
controls.
NO
COM
NO
COM
NC
NO
COM
NC
NO
COM
Unit ON
Steam
Service
Error
Figure 27: Remote Fault Wiring
Warranty
Nortec Humidity Inc. and/or Nortec Humidity Ltd. (hereinafter collectively referred to as THE
COMPANY), warrant for a period of two years after installation or 30 months from
manufacturer’s ship date, whichever date is earlier, that THE COMPANY’s manufactured and
assembled products, not otherwise expressly warranted (with the exception of the cylinder), are
free from defects in material and workmanship. No warranty is made against corrosion,
deterioration, or suitability of substituted materials used as a result of compliance with
government regulations.
THE COMPANY’s obligations and liabilities under this warranty are limited to furnishing
replacement parts to the customer, F.O.B. THE COMPANY’s factory, providing the defective
part(s) is returned freight prepaid by the customer. Parts used for repairs are warranted for the
balance of the term of the warranty on the original humidifier or 90 days, whichever is longer.
The warranties set forth herein are in lieu of all other warranties expressed or implied by law. No
liability whatsoever shall be attached to THE COMPANY until said products have been paid for in
full and then said liability shall be limited to the original purchase price for the product. Any
further warranty must be in writing, signed by an officer of THE COMPANY.
THE COMPANY’s limited warranty on accessories, not of the companies manufacture, such as
controls, humidistats, pumps, etc. is limited to the warranty of the original equipment
manufacturer from date of original shipment of humidifier.
THE COMPANY makes no warranty and assumes no liability unless the equipment is installed in
strict accordance with a copy of the catalog and installation manual in effect at the date of
purchase and by a contractor approved by THE COMPANY to install such equipment.
THE COMPANY makes no warranty and assumes no liability whatsoever for consequential
damage or damage resulting directly from misapplication, incorrect sizing or lack of proper
maintenance of the equipment.
THE COMPANY makes no warranty and assumes no liability whatsoever for damage resulting
from freezing of the humidifier, supply lines, drain lines, or steam distribution systems.
THE COMPANY retains the right to change the design, specification and performance criteria of its
products without notice or obligation
58 | Warranty
U.S.A
826 Proctor Avenue
Ogdensburg, NY 13669
CANADA
2740 Fenton Road
Ottawa, Ontario K1T 3T7
TEL: 1.866.NORTEC1
FAX: 613.822.7964
EMAIL: nortec@humidity.com
WEBSITE: www.humidity.com

NH-EL Series - Nortec Humidity

Transcription

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