Condair 2596995-A RS Series User manual

Condair 2596995-A RS Series User manual
2596995-A EN 1911
ENGINEERING MANUAL
Steam humidifier
Nortec RS series
Humidification and Evaporative Cooling
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Installation date (MM/DD/YYYY):
Commissioning date (MM/DD/YYYY):
Site:
Model:
Serial number:
Contact
Condair Ltd.
2740 Fenton Road, Ottawa, Ontario K1T3T7
TEL: 1.866.667.8321, FAX: 613.822.7964
EMAIL: [email protected], WEBSITE: www.condair.com
Proprietary Notice
This document and the information disclosed herein are proprietary data of Condair Ltd. Neither this document, nor
the information contained herein shall be reproduced, used, or disclosed to others without the written authorization
of Condair Ltd., except to the extent required for installation or maintenance of recipient's equipment.
Liability Notice
Condair Ltd. does not accept any liability due to incorrect installation or operation of the equipment or due to the
use of parts/components/equipment that are not authorized by Condair Ltd.
Copyright Notice
© Condair Ltd. All rights reserved.
Technical modifications reserved
Contents
1
1.1
1.2
1.2.1
1.3
1.4
1.5
1.6
Nortec RS Steam Humidifier
General Description
Features
Detailed Features List
Options
Accessories
Humidifier Components
User Interface
1
1
2
3
4
5
7
11
2
2.1
2.2
2.3
Operation
Functional description
Sequence of Operation
Drain interval time / water consumption
12
12
13
15
3
3.1
3.1.1
3.1.2
3.2
Product Specifications
Model Specifications
Model Designation
Nortec RS Specifications
Specification Drawings
16
16
16
17
20
4
4.1
4.2
4.3
4.3.1
4.3.2
4.3.3
4.3.3.1
4.3.3.2
4.3.3.3
4.3.4
4.4
4.4.1
4.4.1.1
4.4.1.2
4.4.2
4.4.3
4.4.3.1
4.4.3.2
4.4.4
4.4.5
4.5
Planning
Location and Clearances
Services
Installation Requirements
Humidifier Mounting
Water and Drainage Connections
Steam Distribution
Duct Distributors
Blower Packs
Atmospheric Steam and Condensate Lines
Electrical Connection
Control System Design
Control Signal Input
Analog Control Signals
Digital Control Signals
Linkup
Humidity Control Design
Duct Distribution Control Design
Space Distribution Control Design
Remote Fault Indication Board
Accessory Board
Preventative Maintenance
25
25
27
28
28
30
31
31
33
34
38
39
40
40
41
42
43
43
45
46
47
48
Nortec RS
2596995_0_EN_1905
Contents
iii
iv
5
5.1
5.1.1
5.1.1.1
5.1.1.2
5.1.1.3
5.1.1.4
5.1.2
5.1.3
Total Humidification Load Calculation
Total Humification Load
Calculating Base Humidification Load
Total Unconditioned Air Supply Volume
Unconditioned Supply Air Moisture
Conditioned Air Moisture
Base Humidification Load
Moisture Content Equilibrium
Condensate Loss
49
49
50
50
50
51
51
52
53
6
6.1
6.2
Product Selection
Humidifier and Options
Steam Distribution Equipment
55
55
57
A
A.1
A.2
Appendix
Sample Specification
Blank Schedule
Contents
i
i
iii
2596995_0_EN_1905
Nortec RS
Introduction
Purpose of Manual
The Nortec RS Engineering Manual is intended to give the reader a good understanding of the Nortec RS steam
humidifier, its operating principles, features and specifications. It also describes how to calculate the total humidification load for a project, how to select a model, its options and accessories, as well as how to plan for installation
of the unit.
Intended Audience
The Nortec RS Engineering Manual is intended for consulting engineers who design and implement the humidification requirements for a facility.
Other Helpful Resources
Visit www.na.condairhelp.com and use the free Condair online program – Humidifier Engineering and Loadsizing Program (H.E.L.P.) to assist you with absorption distance calculations, selection of humidifiers,
steam distributors, controls and accessories.
Tutorials on using this program are available from the Literature & Media section of the Condair website – www.condair.com.
Additional information on the effects of humidity, relative humidity calculations, load calculations, and
recommended design conditions can be found in the Condair Humidification Load Calculation Manual
(Condair document 2553856).
All documents referenced in this manual are available from www.condair.com.
Nortec RS
2596995_0_EN_1905

v
1
Nortec RS Steam Humidifier
1.1
General Description
The Nortec RS humidifier is an atmospheric steam generator, which operates on the resistance heating principle – heat is generated by the resistive heating elements immersed in water. The Nortec RS
humidifier is designed for direct room humidification using a blower pack, or humidification through the
ducts in an air handling unit using a steam distributor. It is suitable for a variety of humidification applications including commercial offices, hospitals, computer rooms, museums, clean rooms, schools, printing
plants, and other applications where reliability is required.
The Nortec RS humidifier comes in three different housing sizes – small, medium and large depending on the steam output. The small model has capacities ranging from 10 lb/h (4.5 kg/h) to 20 lb/h
(9.1 kg/h), the medium model from 30 lb/h (13.6 kg/h) to 90 lb/h (40.8 kg/h), and the large model from
90 lb/h (40.8 kg/h) to 180 lb/h (81.6 kg/h). The small and medium size models can be ordered with a
built-on blower pack (refer to Figure 1). Table 8 on page 17, Table 9 on page 19 and Table 9 on page 19 list
the specifications for each model.
The large model has two steam cylinders instead of one. The construction is similar to the single cylinder units except that it has two fill and drain connections, two driver boards, and one primary voltage
terminal and two low voltage terminal strips – one for each steam cylinder (designated "A" and "B"). The
separate driver boards and low voltage terminal strips allow the large model to handle two separate sets
of control signals. This gives the large Nortec RS humidifier the flexibility to operate in parallel mode or
series mode for connecting multiple humidifiers together for the same zone.
In parallel mode, one set of control signals is wired to the driver board and low voltage terminal strip for
steam cylinder "A", which controls the humidity in both zones. Both steam cylinders respond equally to
the demand for humidity.
In series mode, one set of control signals is wired to the driver board and low voltage terminal strip for
steam cylinder "A", which control the humidity in both zones. In this mode, both steam cylinders operate
in a staged fashion – steam cylinder "A" can be configured to handle output from 0-50% of demand, and
cylinder "B" from 50-100% of demand.
7
1
2
3
4
6
5
Figure 1: Nortec RS Humidifier Models
1
2
3
4
Nortec RS
RS 10 - RS 20 – small model with single steam cylinder
RS 10 - RS 20 – small model with single steam cylinder
and built-on blower pack
RS 30 - RS 90 – medium model with single steam cylinder
RS 30 - RS 90 – medium model with single steam cylinder
and built-on blower pack
2596995_0_EN_1905
5
6
7
RS 90 - RS 180 – large model with dual steam cylinders
Steam cylinder "A", large model
Steam cylinder "B", large model
Nortec RS Steam Humidifier
1
1.2
Features
The Nortec RS humidifier has many advanced features that set it apart from other humidifiers.
•
Pure, clean steam at an economical price.
•
•
Fully configured and packaged unit that is ready to install out-of-the-box.
Patented Scale Management option provides easiest maintenance on the market.
•
State-of-the-art touchscreen controller provides great user experience and advanced user controls.
•
Robust product from the company that has been in the market for over 40 years, and continues to
perfect humidification technology.
•
Most accurate steam output with optional High Precision control.
•
Zero side clearance for small installation footprint.
•
Standard integration into building management systems (BMS) using Modbus, BACnet MS/TP or
BACnet IP. Other protocols are available as options.
•
Standard drain water cooling which tempers drain water to meet local plumbing code requirements
before it is emptied into the drain.
•
USB port for loading software updates and downloading performance data.
•
Connect up to 5 steam cylinders together in a "Main-Extension" configuration using Nortec Linkup
to satisfy large humidification needs.
•
SIM card for storage of operating parameters and settings.
•
Aesthetic cabinet design.
•
Remote interface to control and modify humidifier settings.
Refer also to the detailed features listed in Table 1.
2
Nortec RS Steam Humidifier
2596995_0_EN_1905
Nortec RS
1.2.1
Detailed Features List
Table 1: Nortec RS Features
Other
Operation and Maintenance
Control and User Interface Features
Feature
Nortec RS
Description
Standard
Optional
Touchscreen interface
Intuitive user interface to configure and monitor the humidifier.

Digital graphic display
Displays visual feedback of the humidifier inputs (conditioned
environment humidity and setpoints).

On/Off control
Operate the equipment with simple On/Off controls.

Up to two modulating control
inputs per cylinder
Allows modulating humidifier output to improve accuracy of
supply humidity.

Integrated PI controller
Provides direct compatibility with humidity transducers (RH
sensor) with adjustable setpoints and P/I parameters.

Demand signal acceptance
Provides direct compatibility with modulating demand signals.

Digital communication
protocols
Provides BMS interface with integrated BACnet IP, BACnet
MS/TP and Modbus protocols.

BTL-certified protocols
Provides BTL-certified BACnet IP, BACnet MS/TP connectivity, and enables use of LonWorks.

Remote fault indication board
Allows dry contact feedback on unit operation.

Accessory relay board
Allows enabling/disabling of accessory devices such as fans
and valves.

Remote interface
Allows direct Ethernet access to the humidifier through a PC.

Independent circuits on multicylinder humidifiers
Allows for independent control of multiple humidifier cylinders
through a common control system.

Status indicator LED
Provides quick feedback on operating status of the unit.

Adjustable units of measure
Display settings in metric or imperial units of measure.

Manual output adjustment
Provides the ability to limit the maximum steam output of the
humidifier.

Cleanable steam cylinder
Simple service of the steam cylinder.

Scale Management
Provides separate removable scale collection tank for ease
of maintenance when using potable water.

High Precision
Equips the unit with solid state relays for high accuracy
steam output up to +/- 1%.

Drain water cooling
Drain water tempered to 140 °F (60 °C) during normal and
manual operation.

Potable and treated water
usage
Compatible with standard potable water supplies as well as
reverse osmosis or de-ionized water.

Secondary drain water cooling valve
Adds a secondary valve for dedicated drain water cooling
using potable water. This option is used when treated RO/DI
water is being supplied to the main boiling tank.
Backflow prevention
Integrated air gap in fill cup provides protection for supply
water systems.
Extended fill cup
Accommodates backpressure up to 10 in H20 (2.49 kPa).
Keep Warm function
Provides improved humidifier response time.

C-UL-US Listed
Certified to meet product standards as detailed by Underwriters Laboratories.

Warranty
Provides guarantee against manufacturer defects. Refer to
"Warranty".

Choice of steam distribution*
Allows for distribution to the conditioned environment directly
with the Nortec RS Space model, or indirectly through duct
distributors.

Wall mounting
Provides a convenient means of integrating humidification
needs.




* The Nortec RS Space model includes a steam distributor.
Nortec RS
2596995_0_EN_1905
Nortec RS Steam Humidifier
3
1.3
Options
Table 2 lists the options available for the Nortec RS humidifier. Detailed installation instructions are supplied with each option.
Table 2: Nortec RS Options
Availability
Option
Factory
Installed
Built-on blower pack

Scale Management

High Precision

Mounting bar

Mounting rack
A blower pack is used to distribute steam generated by
the humidifier directly into a conditioned environment. The
Nortec RS Space model comes with a factory-installed
blower pack and internal steam and condensate connections. A remote-mounted blower pack is also available. Refer
to "Blower Packs" on page 33 for more information.

Provides a separate reservoir underneath the steam cylinder
for scale collection. The addition of this option reduces maintenance time significantly. Minerals removed from the water
during steam production will collect in the scale reservoir
rather than in the tank, away from the heating elements and
drain pump. When minor maintenance is needed, the scale
tank is easily removed and emptied in minutes.
Provides capability of humidifier to achieve +/- 1% steam
output. Solid State Relays allow for rapid response upon
call for humidity, adapting instantly to humidity demand.
This allows for quick response and tight control of humidity.
Also supplied are two fill valves for quicker response (turbo
mode).

Provides two mounting bars which fit into each other for
wall mounting. One bar is fastened to the humidifier, and
the other bar is fastened to the wall. The unit can be hung
onto the wall by engaging the two mounting bars. Note: The
unit can also be wall-mounted (without this option) using the
keyhole cutouts on the back of the humidifier housing.

Stand-alone rack for mounting the Nortec RS humidifier.
Remote fault indication board


Printed circuit board (PCB) with relay contacts for connecting remote status displays for “Unit On”, “Steam”, “Error” and
“Service”. Refer to "Remote Fault Indication Board" on page 46.
Accessory board


PCB with relay contacts for connecting other accessories
such as fans and supply water flushing valves. Refer to "Accessory Board" on page 47.
Factory-configured control
settings

Fill cup extension
4
Description
Field Install
Kit
The humidifier can be factory-configured for the requested
control signal acceptances. The humidifier can also be
reconfigured in the field, as needed. Refer to Table 6 on
page 10 for standard part numbers.

Kit for extending the fill cup so the humidifier can accommodate backpressure up to 10 in H20 (2.49 kPa).
BTL-certified BACnet MS/TP
digital communications


PCB to provide BTL-certified BACnet MS/TP connectivity.
BTL-certified BACnet IP
digital communications


PCB to provide BTL-certified BACnet IP connectivity.
LonWorks digital communications


Supplementary board to provide LonWorks connectivity.
Nortec RS Steam Humidifier
2596995_0_EN_1905
Nortec RS
1.4
Accessories
Table 3 lists the accessories available for the Nortec RS humidifier. Detailed installation instructions are
supplied with each accessory. Standard part numbers are also listed below.
Table 3: Nortec RS Accessories
Accessory
Nortec RS
Description
External condensate cooling
Self-actuated and electric condensate waste water coolers are used to reduce waste water
temperatures to below 140 °F (60 °C) before it is discharged into drains.
Steam distributor
Steam distributors are used for adding steam into ventilation ducts. They are available in
three different steam capacities and various lengths to suit duct dimensions.
Refer to Steam Distributor Installation Manual (Condair document 2556592) for additional
details and part numbers.
SAM-e and Mini SAM-e
distribution manifolds
The SAM-e distribution manifolds are used for adding steam into ventilation ducts larger than
24 in (6 cm) where either higher steam capacity or short absorption distance is required. The
Mini SAM-e is available in dimensions under 24 in (61 cm). They are available in a range of
sizes and steam capacities to match duct and humidifier requirements.
Refer to SAM-e Engineering Manual (Condair document 1503529) for additional details and
part numbers.
Remote blower pack
Blower packs are used for direct humidification of the conditioned environment. Blower
packs are capable of distributing up to 100 lb/h (45 kg/h), should be selected to match or
exceed humidifier capacity.
Refer to Blower Pack Installation, Operation and Maintenance Manual (Condair document
2582277) for additional details.
On/Off humidistats
Condair offers a range of digital and mechanical On/Off duct and wall-mounted humidistats
for use with control and high limit applications. Refer to Table 7 on page 11.
Modulating humidistats
Condair offers a range of digital modulating duct and wall-mounted humidistats for use with
control and high limit applications. Refer to Table 7 on page 11.
Outdoor temperature sensors
Provides automatic humidistat setpoint reduction to prevent condensation on windows/surfaces adjacent to outdoor air. Refer to "Outdoor Temperature Setback" on page 44 for additional
details.
2520263 – Duct-mounted temperature sensor
2553858 – Outdoor mounted temperature sensor
Humidity transducers
Condair offers a range of digital humidity sensors for duct and wall-mounting for use with
control and high limit applications. Refer to Table 7 on page 11.
Air proving switch
Provides a mechanical differential pressure switch to enable humidifier operation when
there is airflow through the ventilation ducts. Adjustable for pressures 0.05-12 in H2O (0.012.99 kPa). Refer to "Air Proving Switch" on page 43 for additional details.
Steam line reducers
Provides a means of adapting steam line diameters to match the diameter of the steam
distributor.
1507846 – Steam line reducer (1-3/4 in to 7/8 in) copper
1508165 – Steam line reducer (1-3/4 in to 7/8 in) stainless steel
Condair flexible steam and
condensate hose
Steam hoses can be used as steam distribution lines or as couplers between 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.
Condensate hose can be used for draining condensate, or coupling to copper or stainless
steel condensate lines.
1328810 – Steam hose (7/8 in I.D.) per foot (30 cm)
1328820 – Steam hose (1-3/4 in I.D.) per foot (30 cm)
1328840 – Condensate hose (3/8 in I.D.) per foot (30 cm)
Large/small condensate trap
tee
Condensate trap tee must be used to remove condensate that forms in steam distribution
lines. Condair offers tees to match large and small steam lines. Offered in Copper only.
1329634 – Condensate trap tee – small (7/8 × 7/8 × 3/8 in)
1329635 – Condensate trap tee – large (1-3/4 × 1-3/4 × 3/8 in)
In-line water filter and replacement filter elements
In-line water filter to remove sediments in the supply water that can obstruct the fill valve
strainer or drain fittings.
1329505 – In-line water filter (5 micron)
1329561 – Replacement filter cartridge (1 micron)
1329506 – Replacement filter cartridge (5 micron)
2596995_0_EN_1905
Nortec RS Steam Humidifier
5
Table 3: Nortec RS Accessories, continued...
Accessory
6
Description
Condensate pump
High temperature condensate pump for pumping waste water from the Nortec RS or condensate from the distributor systems.
1429527 – Drain water sump pump, low flow
2524504 – Electric sump pump, medium flow
2576898 – Electric sump pump, high flow
Drain air gap reducer
All Nortec RS humidifiers require an air gap in the drain line as close as possible to the humidifier. The air gap reducer is a 2-1/2 in to 7/8 in (63.5 mm to 22 mm) fitting that can provide
the required air gap.
2522172 – External drain air gap reducer
Pocket hygro-thermometer
digital display
The pocket hygro-thermometer provides a means to check the humidity and temperature in a
space. It is a useful tool for troubleshooting humidity problems.
1469595 – Pocket hygro-thermometer digital display
Transformer, plug-In,
120 VAC to 24 VAC
AC adaptor 120 VAC to 24 VAC, 40 VA for providing power to remote electronics/controls.
1603032 – Transformer, plug-In, 120 VAC to 24 VAC
Nortec RS Steam Humidifier
2596995_0_EN_1905
Nortec RS
1.5
Humidifier Components
Figure 2 shows the various components of the Nortec RS humidifier. The door panels have been removed
for clarity.
13
14
32
15
12
11
16
17
18
10
31
9
19
8
20
30
29
28
21
7
27
26
22
6
5
25
4
24
3
23
2
1
Figure 2: Nortec RS Humidifier Components (Medium Size Model Shown)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Nortec RS
Scale collector tank drain valve (optional)
Scale collector tank (optional)
Coupling sleeve
Water supply connector (NPT 1/2")
Double inlet valve (valve 1: supply valve,
valve 2: drain water cooling valve)
Drain pump
Water supply hose
Water filling and drain hose
Level hose
Level unit
Pressure equalizing hose
Fill cup
Condensate connector (to drain)
Steam connector 1.77" (ø45 mm)
Steam outlet hose
Heating cable plug
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
2596995_0_EN_1905
Heating elements
Excess temperature switch
Steam cylinder
Drain water cooling hose
Drain hose
Drain cup with drain connector 1.18" (ø30 mm)
Unit switch
Control voltage transformer
Touch screen display
Cable feed throughs
Control board
Specification label
Voltage supply terminals
Driver board
Main contactor
Heating section terminals
Nortec RS Steam Humidifier
7
The Nortec RS humidifier housing contains two cabinets – the plumbing cabinet (on the left) and the
controls cabinet (on the right) – refer to Figure 2 on page 7. Table 4 summarizes the functions of the main
components in these two cabinets.
Table 4: Nortec RS Humidifier Component Functions
Controls cabinet
Plumbing cabinet
Component
8
Function
Steam cylinder
Water reservoir in which boiling takes place. It houses a set of resistive heating elements that are used to boil the water. It has a steam outlet at the top, and a water
inlet/outlet at the bottom.
Cable harness with plug
Cable ahrness with plug that feeds electric current to the resistive heating elements
housed in the steam cylinder.
Drain canal
Combined drain outlet for discharge from the steam cylinder and fresh water for drain
water cooling.
Drain pump
Drains water out of the steam cylinder.
Fill cup
Provides a gravity feed means to fill the steam cylinder through the drain pump. A
built-in air gap prevents backflow.
Fill valve
Controls the flow of feed water into the fill cup.
Fill cup extension (optional)
Optional kit for extending the fill cup so the humidifier can accommodate backpressure
up to 10 in H2O (2.49 kPa).
High voltage terminal block
Primary power connection from the external disconnect switch to the humidifier.
Contactor
Activates/deactivates power to the resistive heating elements in the steam cylinder.
Driver board
Provides input and output connections to the humidifier components.
Integrated control board
Controls all functions of the humidifier, and provides a user interface through the integrated touchscreen display. It also permits connection to multiple humidifiers, as well
as to the BMS. An on-board USB port also permits exchange of data.
Touchscreen display
User interface to monitor and control the humidifier.
On/Off switch
Allows the user to turn the humidifier On and Off.
Low voltage terminal strip
Terminal strip for connecting control signal inputs to the humidifier.
Remote fault indication PCB
Optional printed circuit board with dry contacts to connect remote status displays for
"Unit On", "Steam", "Error" and "Service".
Accessory relay PCB (not
shown)
Optional printed circuit board with dry contacts to enable/disable other accessories
such as fans and supply water flushing valves.
Transformer
Steps down primary voltage to 24 VAC to power the on-board low voltage electronics.
Nortec RS Steam Humidifier
2596995_0_EN_1905
Nortec RS
Part numbers and quantities for ordering Nortec RS options are shown in Table 5.
Table 5: Nortec RS Options, Part Number Matrix
Nortec RS
unit size S
10
15
unit size M
20
30
45
65
unit size L
90
90
130
180
Process/Precision
Provides capability of humidifier
to achieve ± 1% humidity control*.
Solid State Relays allow for rapid response upon call for humidity, adapting instantly to humidity demand.
This allows for quick response and
tight control of humidity. Also supplied are two fill valves for quicker
response (turbo mode). This option
is also recommended any time that
the humidifier is being controlled by a
modulating signal.
1x P
* Humidity control is dependent on a
variety of factors, including design of
piping from humidifier to distributor,
duct characteristics from distributor to
space, control devices and locations.
In-field results may vary.
Scale tank
Provides a separate reservoir underneath the steam cylinder for scale
collection. The addition of this option
reduces maintenance time significantly. Minerals removed from the water
during steam production will collect
in the scale reservoir rather than in
the tank. For the double tank humidifiers (RS 135 and 180), order two for
each humidifier. This option is recommended any time that the humidifier
is being supplied with potable water.
Built-on Blower Pack
For in-space applications.
1x SC
(2x SC for RS 90 large unit)
2x SC
not available for
large unit
1x BOBP
Remote operating and fault indication
1xRFI
PCB with relay contacts for the connection of remote displays for "Operation", "Steam", "Fault" and "Service".
Accessory Board
PCB with relay contacts for the connection of remote fan enable (cylinder
A/B) as well as hygiene flush (cylinder
A/B).
1x ACC
BACnet MSTP BTL
PCB to provide BTL certified BACnet
MSTP. This option also enables full
Master functionality when using BACnet MSTP.
1x BAC-BTL
LonWorks board
Supplementary board to connect the
Nortec RS to a building management
system via LonWorks.
Nortec RS
1x LON
2596995_0_EN_1905
Nortec RS Steam Humidifier
9
Nortec RS
unit size S
10
15
unit size M
20
30
45
65
unit size L
90
90
130
180
Mounting rail
Provides two mounting rails which fit
into each other for wall mounting. One
bar is fastened to the humidifier, the
other bar is fastened to the wall. The
unit can then be "hung" onto the wall
by engaging the two mounting rails.
Note: without this option, the unit may
still be wall mounted using the keyhole cutouts on the back of humidifier
housing.
Mounting rack basic
Mounting rack for Nortec RS.
1x MP-S
1x MP-M
not available for
large unit
1x MR-B-S
1x MR-B-M
1x MR-B-L
Height extension profiles for
mounting rack basic
Height extension profiles for mounting rack.
1x MR-E
N/A
1x MR-A
N/A
1x OPS
2x OPS
1x RO-A
1x RO-A
Screw feet for mounting rack basic
Screw feet for levelling the mounting
rack.
Pressure compensation kit
Provides extension for the fill cup
to overcome back pressure (including duct static pressure) in excess of
5-1/2" water column. Longer hoses included. Two required for double tank
humidifiers.
Secondary Valve
Provides a secondary valve to use
potable water for dedicated internal
drain water cooling. This option can
be included when treated RO/DI
water is being supplied to the main
boiling tank. This option saves expensive treated water by not sending it
to drain for tempering. Note that this
option should not be included with
scale management since it is typically
not required when supplying treated
water.
Part numbers for ordering control signal configurations for the Nortec RS humidifier are shown in Table 6.
Table 6: Nortec RS Control Signal Acceptance Part Numbers
Signal
10
Standard Part Numbers – Demand Signal
Acceptance
Standard Part Numbers – Transducer
Signal Acceptance
Single Channel
Dual Channel
Single Channel
Dual Channel
0-5 VDC
2523060
2523061
2523100
2523101
0-20 mA
2523062
2523063
2523102
2523104
4-20 mA
2523064
2523065
2523105
2523107
0-10 VDC
2523066
2523089
2523110
2523111
0-16 VDC
2523090
2523091
2523112
2523113
1-5 VDC
2523092
2523093
2523114
2523115
2-10 VDC
2523094
2523094
2523116
2523117
0-20 VDC
2523096
2523097
2523118
2523119
Nortec RS Steam Humidifier
2596995_0_EN_1905
Nortec RS
Part numbers for ordering other Condair accessories are shown in Table 7.
Table 7: Condair Humidistat Part Numbers
Part
Number
Demand
Transducer
DuctWallDuctWallmounted mounted mounted mounted
Digital
Mechanical 0-10 VDC 2-10 VDC
On/Off
Fan Start
2548732

–
–
–

–
–
–


2548731
–

–
–

–
–
–


2520273*

–
–
–

–
–
–


1510142
–

–
–

–

–
–

2520266*

–
–
–

–

–
–

1329102
–

–
–
–

–
–

–
1329108

–
–
–
–

–
–

–
1509858
–
–
–


–
–

–
–
1509857
–
–

–

–
–

–
–
* Remote-mounted digital controller included for ease of access.
1.6
User Interface
The Nortec RS humidifier has an interactive touchscreen display which can be used to configure and
monitor its operation. Refer to Figure 3.
In addition, the unit can also be configured and monitored remotely using the built-in BMS connectivity
(BACnet, Modbus).
1
2
3
Figure 3: Nortec RS User Interface
1
2
3
Nortec RS
Touchscreen display – user interface to configure the humidifier, and access status information
Status LED – multi-function LED changes color to indicate operating status of the unit
On/Off switch – allows user to turn humidifier On/Off
2596995_0_EN_1905
Nortec RS Steam Humidifier
11
2
Operation
2.1
Functional description
The Nortec RS steam humidifier is an atmospheric steam generator. It operates on the resistance heating
principle and is designed for direct room air humidification (with blower pack) and indirect humidification
(with steam distributor) in HVAC systems.
Water supply
The water is supplied via an optional external sediment filter to the steam humidifier. It reaches the steam
cylinder via the level controlled inlet valve and the fill cup.
Note: the fill cup is designed with an internal 1" air gap, to separate the supply water from the unit water.
That means, no unit water can flow back into the supply water line.
Level regulation
The water level in the steam cylinder is continuously monitored with the level unit. If the water level
reaches a preset level (due to the evaporation process) the level unit supplies a signal to the controller.
This opens the inlet valve and the steam cylinder is filled up. When the preset operating level is reached,
the level unit supplies another signal to the controller to close the inlet valve.
The pressure equalizing pipe between the steam connection and the level unit ensures that the water
levels are the same in the steam cylinder and the level unit.
Steam generation regulation
The steam is produced in the steam cylinder by several resistive heating elements. An external or the
integrated continuous controller control the steam production fully variably from 0 to 100 %.
Alternatively the Nortec RS can be controlled also via an On/Off controller.
Flushing
The evaporation process increases the concentration of minerals in the water of the steam cylinder. A
suitable volume of water must be flushed out of the steam cylinder from time to time and replaced by
fresh water to ensure that this concentration does not exceed a level unsuitable for operation.
The Nortec RS consists of the following two forms of flushing:
–– Automatic flushing takes place as soon as the water in the steam cylinder exceeds the upper
operating level (e.g. by foaming of the water).
–– Flushing dependent on time performs the flushing process at preselected time intervals.
Automatic or time-dependent flushing takes place depending on the water quality and the operating data.
If the lowest operating level is reached during the flushing process, the inlet valve remains open until
the water level in the steam cylinder has reached the normal working level again. If the lowest operating
level is not reached, the inlet valve is closed.
Scale collector tank
The minerals precipitated by the evaporation process sink down in the steam cylinder and accumulate
in the scale collector tank, thus extending the service intervals and reducing the maintenance work.
Units designed for operation with water from a RO system or with de-ionized water do not require a scale
collector tank as RO water and de-ionized water contains only small amounts of minerals.
12
Operation
2596995_0_EN_1905
Nortec RS
2.2
Sequence of Operation
The following is a general sequence of operation – the actual sequence may vary depending upon operating conditions and user-configurable parameters. Refer to Figure 4 on page 14.
1. When the humidifier receives a valid humidity demand signal, the level unit of the Nortec RS performs
a level test.
2. If the water level in the steam cylinder is below the operation level, the fill valve opens and fills the
steam cylinder via the fill cup and the fill hose connected to the coupling sleeve at the bottom of the
cylinder to the operation level. The humidifier displays the status message “Filling”.
3. As soon as the operation level is reached, the fill valve closes, the main contactor closes and directs
power to the resistive heating elements in the steam cylinder(s). The LED lights green and steam
is produced after a short delay.
4. As water level in the steam cylinder drops due to evaporation to a certain level, the fill valve opens
and refills the water in the steam cylinder to the operating level again.
5. As the humidifier continues to operate:
a. the water level in the steam cylinder drops due to evaporation. If the level drops to a certain low
level, the fill valve opens and refills the water in the steam cylinder to the operating level again.
b. the concentration of minerals in the water of the steam cylinder increases due to evaporation.
To ensure that this concentration does not exceed a level unsuitable for operation, a certain
amount of water is flushed out of the steam cylinder from time to time and replaced by fresh
water (refer to "Flushing" on page 12).
6. The operating sequence loops back to step 2 and continues steam production as long as there is a
valid humidity demand signal.
Nortec RS
2596995_0_EN_1905
Operation
13
1
3
2
16
4
17
18
5
Driver board
15
8
3V
CR2032
X1
7
X7
6
Control board
14
19
20 21
13
9 10
11
12
Figure 4: Humidifier Schematic
1
2
3
4
5
6
7
8
9
10
11
14
Operation
Steam distributor
Condensate drain line
Steam line
Fill cup
Resistive heating elements
Supply hose
Fill and drain hose
Overflow hose
Fill valve
Drain pump
Drain canal
12
13
14
15
16
17
18
19
20
21
2596995_0_EN_1905
Lime collector tank
Steam cylinder
Level unit
Excess temperature switch
Heating cable plug
Control boeard
Driver board
Unit switch
Contactor
Supply terminal
Nortec RS
2.3
Drain interval time / water consumption
The drain interval time is either calculated automatically by the control software based on the set supply
water quality and the water hardness or can be set manually. However the water quality on site must be
obtained from the local water supplier.
During a drain cycle, the fill valve is energized to assist in reducing the drain water temperature below
140 °F (60 °C), and at the same time the drain pump is energized. The water consumption of the Nortec
RS largely depends on the set drain interval time based on the supply water quality and water hardness
(refer to "Model Specifications" on page 16 for draining rates).
If a heavy scale build up is discovered when servicing the steam cylinder the drain interval time must
be reduced. On the other hand if only a light scale build up is discovered the drain interval time can be
increased.
Nortec RS
2596995_0_EN_1905
Operation
15
3
Product Specifications
3.1
Model Specifications
3.1.1
Model Designation
The specification label on the side (and the underside) of the Nortec RS humidifier shows its model
number, serial number and ratings – refer to "Humidifier Components" on page 7. The breakdown of the
model number is shown in Figure 5.
Example:
Nortec RS Space 65 440-480V/3~ P SC
Product designation
Unit model:
Blank= Duct
Space= with blower pack
Steam capacity in lb/hr:
Heating voltage:
208V/1~/50...60Hz: 208V/1~
240V/1~/50...60Hz: 240V/1~
440-480V/1~/50...60Hz: 440-480V/1~
600V/1~/50...60Hz: 600V/1~
208V/3~/50...60Hz: 208V/3~
240V/3~/50...60Hz: 240V/3~
440-480V/3~/50...60Hz: 440-480V/3~
600V/3~/50...60Hz: 600V/3~
Control accuracy:
P: high control accuracy
Water management:
SC: with scale collector tank
Figure 5: Model Number Breakdown
16
Product Specifications
2596995_0_EN_1905
Nortec RS
3.1.2
Nortec RS Specifications
The Nortec RS humidifier is available in a range of output capacities, voltages and configurations.
Refer to Table 8 on page 17 for the Nortec RS (Duct) specifications, and Table 9 on page 19 for the
Nortec RS Space specifications.
In addition, the short-circuit current rating (SCCR) for all Nortec RS humidifiers is 5 kA.
Table 8: Nortec RS Specifications
Type
(Housing
size)
RS 10
(S)
RS 15
(S)
RS 20
(S)
RS 30
(M)
RS 10
(S)
RS 15
(S)
RS 20
(S)
RS 30
(M)
RS 45
(M)
Nortec RS
Voltage
V
Steam
­ apacity
C
lb/h (kg/h)
Nominal
current
A
Maximum
External
Fuse
A
Power
consumption
kW
208 V/1~
10.9 (4.9)
17.8
25
3.7
220-240 V/1~
10.9 (4.9)
15.5
20
3.7
440-480 V/1~
9.7 (4.4)
6.9
15
3.3
550-600 V/1~
11.4 (5.2)
6.5
15
3.9
208 V/1~
15.9 (7.2)
26.0
35
5.4
220-240 V/1~
14.5 (6.6)
20.6
25
4.9
440-480 V/1~
14.1 (6.4)
10.0
15
4.8
550-600 V/1~
14.7 (6.7)
8.3
15
5.0
208 V/1~
21.2 (9.6)
34.7
50
7.2
220-240 V/1~
21.2 (9.6)
30.0
40
7.2
440-480 V/1~
18.8 (8.5)
13.3
20
6.4
550-600 V/1~
19.6 (8.9)
11.1
15
6.7
208 V/1~
31.8 (14.4)
52.0
70
10.8
220-240 V/1~
31.8 (14.4)
45.0
60
10.8
440-480 V/1~
31.5 (14.3)
22.3
30
10.7
550-600 V/1~
31.4 (14.2)
17.8
25
10.7
208 V/3~
10.9 (4.9)
10.3
15
3.7
220-240 V/3~
10.9 (4.9)
8.9
15
3.7
440-480 V/3~
11.3 (5.1)
4.6
15
3.8
550-600 V/3~
11.1 (5.0)
3.6
15
3.8
208 V/3~
15.9 (7.2)
15.0
20
5.4
220-240 V/3~
14.5 (6.6)
11.9
15
4.9
440-480 V/3~
14.6 (6.6)
6.0
15
5.0
550-600 V/3~
17.6 (8.0)
5.8
15
6.0
208 V/3~
21.2 (9.6)
20.0
25
7.2
220-240 V/3~
21.2 (9.6)
17.3
25
7.2
440-480 V/3~
19.4 (8.8)
7.9
15
6.6
550-600 V/3~
22.8 (10.3)
7.4
15
7.7
208 V/3~
28.8 (13.1)
27.2
35
9.8
220-240 V/3~
31.8 (14.4)
26.0
35
10.8
440-480 V/3~
31.5 (14.3)
12.9
20
10.7
550-600 V/3~
31.4 (14.2)
10.3
15
10.7
208 V/3~
47.7 (21.6)
45.0
60
16.2
220-240 V/3~
47.9 (21.7)
38.7
50
16.1
440-480 V/3~
45.2 (20.5)
18.5
25
15.4
550-600 V/3~
47.1 (21.4)
15.4
20
16.0
2596995_0_EN_1905
Fill Rate
gpm
(l/min)
Drain Rate
gpm
(l/min)
Netweight /
Operating
Weight
lb (kg)
60/89
(27/40)
3.7
(14.0)
6.7
(25.4)
89/145
(40/66)
60/89
(27/40)
3.7
(14.0)
6.7
(25.4)
89/145
(40/66)
Product Specifications
17
Table 8: Nortec RS Specifications, continued...
Type
(Housing
size)
RS 65
(M)
RS 90
(M)
RS 90
(L)
RS 130
(L)
RS 180
(L)
*
18
Voltage
V
Steam
­ apacity
C
lb/h (kg/h)
Nominal
current
A
Maximum
External
Fuse
A
Power
consumption
kW
208 V/3~
71.6 (32.5)
67.5
90
24.3
220-240 V/3~
71.9 (32.6)
58.0
80
24.1
440-480 V/3~
63.0 (28.6)
25.8
35
21.4
550-600 V/3~
70.6 (32.0)
23.1
30
24.0
208 V/3~
94.6 (42.9)
38.7
50
32.1
220-240 V/3~
94.3 (42.8)
30.8
40
32.0
440-480 V/3~
95.4 (43.3)
90.0
125
32.4
550-600 V/3~
94.6 (42.9)
77.4
100
32.2
208 V/3~
143.2 (65.0)
135.0
175
48.6
220-240 V/3~
141.8 (64.3)
116.0
150
48.2
440-480 V/3~
126.0 (57.2)
51.6
70
42.8
550-600 V/3~
141.2 (64.1)
46.2
60
46.2
440-480 V/3~
189.2 (85.8)
77.3
100
64.2
550-600 V/3~
188.6 (85.5)
61.7
80
64.0
Fill Rate
gpm
(l/min)
Drain Rate
gpm
(l/min)
Netweight /
Operating
Weight
lb (kg)
3.7
(14.0)
6.7
(25.4)
89/145
(40/66)
2 x 3.7
(2 x 14.0)
2 x 6.7
(2 x 25.4)
178.57 (81.0)
291.01 (132.0)
Per steam cylinder
Product Specifications
2596995_0_EN_1905
Nortec RS
Table 9: Nortec RS Space Specifications
Type
(Housing
size)
RS 10
(S)
RS 15
(S)
RS 20
(S)
RS 30
(M)
RS 10
(S)
RS 15
(S)
RS 20
(S)
RS 30
(M)
RS 45
(M)
RS 65
(M)
RS 90
(M)
Nortec RS
Voltage
V
Steam
­ apacity
C
lb/h (kg/h)
Nominal
current
A
Maximum
External
Fuse
A
Power
consumption
kW
208 V/1~
10.9 (4.9)
17.8
25
3.7
220-240 V/1~
10.9 (4.9)
15.5
20
3.7
440-480 V/1~
9.7 (4.4)
6.9
15
3.3
550-600 V/1~
11.4 (5.2)
6.5
15
3.9
208 V/1~
15.9 (7.2)
26.0
35
5.4
220-240 V/1~
14.5 (6.6)
20.6
25
4.9
440-480 V/1~
14.1 (6.4)
10.0
15
4.8
550-600 V/1~
14.7 (6.7)
8.3
15
5.0
208 V/1~
21.2 (9.6)
34.7
50
7.2
220-240 V/1~
21.2 (9.6)
30.0
40
7.2
440-480 V/1~
18.8 (8.5)
13.3
20
6.4
550-600 V/1~
19.6 (8.9)
11.1
15
6.7
208 V/1~
31.8 (14.4)
52.0
70
10.8
220-240 V/1~
31.8 (14.4)
45.0
60
10.8
440-480 V/1~
31.5 (14.3)
22.3
30
10.7
550-600 V/1~
31.4 (14.2)
17.8
25
10.7
208 V/3~
10.9 (4.9)
10.3
15
3.7
220-240 V/3~
10.9 (4.9)
8.9
15
3.7
440-480 V/3~
11.3 (5.1)
4.6
15
3.8
550-600 V/3~
11.1 (5.0)
3.6
15
3.8
208 V/3~
15.9 (7.2)
15.0
20
5.4
220-240 V/3~
14.5 (6.6)
11.9
15
4.9
440-480 V/3~
14.6 (6.6)
6.0
15
5.0
550-600 V/3~
17.6 (8.0)
5.8
15
6.0
208 V/3~
21.2 (9.6)
20.0
25
7.2
220-240 V/3~
21.2 (9.6)
17.3
25
7.2
440-480 V/3~
19.4 (8.8)
7.9
15
6.6
550-600 V/3~
22.8 (10.3)
7.4
15
7.7
208 V/3~
28.8 (13.1)
27.2
35
9.8
220-240 V/3~
31.8 (14.4)
26.0
35
10.8
440-480 V/3~
31.5 (14.3)
12.9
20
10.7
550-600 V/3~
31.4 (14.2)
10.3
15
10.7
208 V/3~
47.7 (21.6)
45.0
60
16.2
220-240 V/3~
47.9 (21.7)
38.7
50
16.1
440-480 V/3~
45.2 (20.5)
18.5
25
15.4
550-600 V/3~
47.1 (21.4)
15.4
20
16.0
208 V/3~
71.6 (32.5)
67.5
90
24.3
220-240 V/3~
71.9 (32.6)
58.0
80
24.1
440-480 V/3~
63.0 (28.6)
25.8
35
21.4
550-600 V/3~
70.6 (32.0)
23.1
30
24.0
440-480 V/3~
94.6 (42.9)
38.7
50
32.1
550-600 V/3~
94.3 (42.8)
30.8
40
32.0
2596995_0_EN_1905
Fill Rate
gpm
(l/min)
Drain Rate
gpm
(l/min)
Netweight /
Operating
Weight
lb (kg)
98/127
(45/58)
3.7
(14.0)
6.7
(25.4)
127/183
(58/83)
98/127
(45/58)
3.7
(14.0)
6.7
(25.4)
127/183
(58/83)
Product Specifications
19
Specification Drawings
Empty Weight
60 lbs
Full Weight
89 lbs
Front Clearance
36 in.
Ceiling Clearance
16 in.
Left/Right Clearance
0 in.
Floor Clearance
24 in.
Water Inlet Pressure
30-80 psig
3.16 (80.2)
6.83 (173.5)
CONDENSATE RETURN
ø 0.31 (8)
2X MARKED “A”
A
A
1.76 (44.7)
8.54 (217)
2.82 (71.7)
3.24 (82.4)
3.2
STEAM OUT
ø 1.77 (45)
4.87 (123.8)
12.00 (304.8)
1.38
(35)
0.28 (7)
12.00 (304.8)
16.54 (420)
2.27
26.40 (670.5)
0.59 (15)
2.13 (54)
38.85 (986.7)
10.63 (270)
7.62 (193.5)
2.13 (54)
(57.6)
19.69 (500)
14.33 (364)
2.27 (57.6)
2.24 (57)
1.73 (44)
3.82 (97)
WATER FILL
NPT 1/2"
8.33 (211.5)
ALL UNITS IN INCHES (mm)
2.01 (51)
WATER DRAIN
Ø 1.22 (31)
Nortec RS Small (10 to 20)
Physical Data & Dimensions
Rev A
25-Apr-2018
Figure 6: Nortec RS 10 - RS 20 Physical Data and Dimensions
20
Product Specifications
2596995_0_EN_1905
Nortec RS
Front Clearance
36 in.
Ceiling Clearance
16 in.
Left/Right Clearance
0 in.
Floor Clearance
24 in.
Water Inlet Pressure
30-80 psig
3.48 (88.5)
2.43 (61.8)
A
A
STEAM OUT
ø 1.77 (45)
16.00 (406.5)
1.38 (35)
16.00 (406.5)
2.43
20.87 (530)
0.59 (15)
10.63 (270)
2.13 (54)
43.19 (1097)
30.71 (780)
2.13 (54)
7.62 (193.5)
(61.8)
24.02 (610)
0.28 (7)
CONDENSATE RETURN
ø 0.31 (8)
2X MARKED “A”
1.76 (44.7)
145 lbs
6.44 (163.5)
2.43 (61.8)
9.13 (232)
Full Weight
15.98 (406)
7.16 (181.8)
89 lbs
3.24 (82.4)
Empty Weight
2.24 (57)
1.73 (44)
3.82 (97)
WATER FILL
NPT 1/2"
2.01 (51)
12.66 (321.5)
ALL UNITS IN INCHES (mm)
WATER DRAIN
Ø 1.22 (31)
Nortec RS Medium (30 to 90)
Physical Data & Dimensions
Rev A
25-Apr-2018
Figure 7: Nortec RS 30 - RS 90 Physical Data and Dimensions
Nortec RS
2596995_0_EN_1905
Product Specifications
21
20.49 (520.5)
16.49 (418.8)
291 lbs
Front Clearance
36 in.
Ceiling Clearance
16 in.
Left/Right Clearance
0 in.
Floor Clearance
24 in.
Water Inlet Pressure
30-80 psig
CONDENSATE OUT
ø 0.31 (8)
4X MARKED “A”
A
A
A
A
1.76 (44.7)
Full Weight
6.44 (163.5)
2.43 (61.8)
9.13 (232)
179 lbs
3.24 (82.4)
Empty Weight
178.8
535.8
STEAM OUT
ø 1.77 (45)
2X
39.37 (1000)
0.28 (7)
16.00 (406.5)
16.00 (406.5)
2.76 (70)
2.13 (54)
10.63 (270)
43.19 (1097)
30.71 (780)
6.46 (164)
4.61 (117)
23.23 (590)
10.37(263.5)
15.98 (406)
0.59 (15)
4.21 (107)
1.73 (44)
3.82 (97)
WATER FILL
NPT 1/2"
2X
2.01(51)
WATER DRAIN
Ø 1.22 (31)
2X
12.66(321.5)
16.06 (408)
26.71 (678.5)
ALL UNITS IN INCHES (mm)
Nortec RS Large (90 to 180)
Physical Data & Dimensions
Rev A
25-Apr-2018
Figure 8: Nortec RS 90 - RS 180 Physical Data and Dimensions
22
Product Specifications
2596995_0_EN_1905
Nortec RS
Full Weight
127 lbs
Front Clearance*
RS 10: 6 in. | RS 15-20: 60 in.
Ceiling Clearance*
12 in.
Left/Right Clearance*
12 in.
Floor Clearance*
86.5 in. to top of blower pack
Water Inlet Pressure
30-80 psig
15.8 (400)
0.5 (12 )
98 lbs
14.4 (365)
Empty Weight
35.2 (893)
10.63 (270)
0.59 (15)
2.13 (54)
38.85 (986.7)
26.40 (670.5)
10.9 (277)
16.4 (417)
7.62 (193.5)
19.69 (500)
2.13 (54)
16.54 (420)
3.16 (80.2)
12.00 (304.8)
2.24 (57)
1.38
(35)
2.27 (57.6)
12.00 (304.8)
2.27
3.82 (97)
WATER FILL
NPT 1/2"
* Clearances with blower pack on HIGH
1.73 (44)
(57.6)
8.33 (211.5)
2.01 (51)
WATER DRAIN
Ø 1.22 (31)
ALL UNITS IN INCHES (mm)
Nortec EL Small Space (10 to 20)
Physical Data & Dimensions
Rev A
25-Apr-2018
Figure 9: Nortec RS 10 - RS 20 Space Physical Data and Dimensions
Nortec RS
2596995_0_EN_1905
Product Specifications
23
Empty Weight
127lbs
Full Weight
183 lbs
Front Clearance*
RS 30: 71 in. | RS 45: 132 in. |
RS 65: 153 in. | RS 90: 218 in.
Ceiling Clearance*
12 in.
Left/Right Clearance*
RS 10-45: 12 in. | RS 65-90: 30 in.
Floor Clearance*
96 in. (to bottom of blower pack)
Water Inlet Pressure
30-80 psig
15.7 (400)
20.9 (530)
20.87 (530)
16.3 (415)
0.5 (12 )
2.2 (56)
16.00 (406.5)
2.43 (61.8)
16.00 (406.5)
1.38 (35)
3.82 (97)
WATER FILL
NPT 1/2"
* Clearances with blower pack on HIGH
2.24 (57)
1.73 (44)
2.43 (61.8)
3.48 (88.5)
0.59 (15)
10.63 (270)
2.13 (54)
43.19 (1097)
30.71 (780)
16.4 (417)
2.13 (54)
7.62 (193.5)
24.02 (610)
10.4 (265)
16.54 (420)
2.01 (51)
12.66 (321.5)
ALL UNITS IN INCHES (mm)
WATER DRAIN
Ø 1.22 (31)
Nortec RS Medium Space (30 to 90)
Physical Data & Dimensions
Rev A
25-Apr-2018
Figure 10: Nortec RS 30 - RS 65 Space Physical Data and Dimensions
24
Product Specifications
2596995_0_EN_1905
Nortec RS
4
Planning
This chapter contains planning information for selecting the location, as well as provisioning of services
for the Nortec RS humidifier. It also describes the installation requirements for mounting, plumbing,
electrical and steam connections. Design of the control systems and preventative maintenance for the
Nortec RS humidifier are also discussed.
4.1
Location and Clearances
When selecting the location of the humidifier, choose a location that is close as possible to the steam
distributor. This will minimize heat loss through the steam line. Locate the humidifier below the steam
distributor, when possible.
Allow adequate clearances around the humidifier for ease of maintenance. Although the Nortec RS
humidifier requires no side clearance, Condair recommends minimum clearances of 6 in (150 mm)
on the side. A clearance of 24 in (610 mm) between the humidifier and the ground is also required.
Refer to Figure 11 and Table 10 on page 26, which also show the clearances required for the Nortec RS
Space unit. Observe all local and national installation codes. Condair is not responsible for any
installation code violations.
Refer to the Blower Pack Installation, Operation and maintenance Manual (Condair document 2582277)
for clearances required for remote-mounted blower packs. All Condair documents are available from
www.condair.com.
The selected location should permit proper routing of services, as well as steam and condensate lines.
min. 15"
min. 380 mm
The Nortec RS humidifier should only be installed in a drip-proof location within buildings, where the
ambient temperature is 41-104 °F (5-40 °C) and the relative humidity is 5-95% (non-condensing).
*
0"
m
m
0
* recommended: 6" (150 mm)
*
0"
m
m
0
X
min. 24"
min. 610 mm
Z
Y
min min
. 91 . 36
4m "
m
Figure 11: Clearances Nortec RS
Nortec RS
2596995_0_EN_1905
Planning
25
D
D
D
D
B
A
E
B
A
C
C
Figure 12: Clearances Nortec RS
Table 10: Minimum Clearances for Blower Packs
Steam
Capacity
lb/h (kg/h)
10 (4.5)
15 (6.8)
20 (9.0)
30 (13.5)
45 (20.5)
65 (30.0)
90 (40.0)
Blower Pack
Speed Setting
Min. Frontal
Clearance –
"A"
in (m)
Min. Overhead
Clearance –
"B"
in (m)
Low
9 (0.23)
12 (0.31)
High
6 (0.16)
12 (0.31)
Low
18 (0.46)
12 (0.31)
High
6 (0.16)
12 (0.31)
Low
75 (1.91)
12 (0.31)
High
60 (1.53)
12 (0.31)
Low
86 (2.19)
12 (0.31)
High
71 (1.81)
12 (0.31)
Low
174 (4.42)
12 (0.31)
High
132 (3.36)
12 (0.31)
Low
189 (4.81)
48 (1.22)
High
153 (3.89)
12 (0.31)
Low
248 (6.30)
84 (2.14)
High
218 (5.54)
12 (0.31)
Min. Height
Suggested
Above Ground Left Side Clear– "C"
ance – "D"
in (m)
in (m)
Suggested
Right Side
Clearance –
"D"
in (m)
12 (0.31)
90 (2.3)
30 (0.77)
Data based upon nominal conditions 72 °F (22 °C), 40% RH.
Note: The High speed setting on the blower pack permits shorter absorption distances, whereas the Low setting permits the blower to
run quieter but requires longer absorption distances. Visit www.na.condairhelp.com and use the free Condair online program - Humidifier
Engineering and Load-sizing Program (H.E.L.P.) to assist with absorption distance and other calculations.
26
Planning
2596995_0_EN_1905
Nortec RS
4.2
Services
Water Supply
Water supply to the humidifier must be cold potable drinking water, reverse osmosis (RO) or deionized (DI) water.
The water supply should also be free of additives such as corrosion inhibitors, disinfectants, etc.,
which may affect the performance of the humidifier.
The water supply should have a minimum flow rate of 3.7 gal/min (14 l/min) per cylinder.
The admissible mains pressure must be 30 ... 80 psi (2.0 ... 5.5 bar) (ham hammer-free system).
For mains pressures >80.0 psi (>5.5 bar), the connection must be made via a pressure reducing
valve (adjusted to 30.0 psi (2.0 bar). For mains pressures <30.0 psi (<2.0 bar) please contact your
Condair supplier.
Water temperature should be 33.8 ... 77.0 °F (1...25 °C).
The water supply should be filtered to 5 μm (optional, but recommended).
The inner diameter of the water supply piping should be ø1/2 in (ø12 mm), and must have a 1/2 in
NPT female end.
The water supply line should be made of copper, stainless steel or plastic certified for drinking water
systems.
A shutoff valve and a union fitting must be supplied in the water supply line for ease of maintenance.
Drainage
The humidifier should be connected to a dedicated building drain (recommended) with a minimum
drainage rate of 6.7 gal/min per cylinder. For safety reasons, drain water from the humidifier should
not empty into a sink used by personnel. The drain line must allow free and easy draining. A restricted
drain can cause water in the humidifier to over-concentrate and cause water to back up at the air
gap funnel. Refer to "Water and Drainage Connections" on page 30.
The building drain pipe should be made of either copper or stainless steel (minimum DIN 1.4301)
so it can handle drain water temperatures up to 212 °F (100 °C).
The space in which the humidifier is to be installed should have a floor drain. However, if a floor
drain is not available, a leakage monitoring device must be supplied to permit interruption of the
water supply in case of a leakage.
Power Supply
The power supply to the humidifier should match the full voltage and current draw listed in the specifications. Refer to Table 8 on page 17 for the Nortec RS power requirements, and Table 9 on page 19
for the Nortec RS Space power requirements.
The power supply must have an external dedicated fused disconnect switch. The fusing must not
exceed the maximum circuit protection listed in the tables referenced above.
Nortec RS
2596995_0_EN_1905
Planning
27
4.3
Installation Requirements
4.3.1
Humidifier Mounting
The Nortec RS humidifier can be mounted on a wall or equivalent support using the keyholes on the
back of the unit. 1/4×2 lag bolts are used to secure the unit to 2×4 studs in the wall (or equivalent support). Refer to Figure 13.
The unit can also be mounted on the wall (or equivalent support) using the optional mounting bar. Refer
to the Nortec RS Installation Manual (Condair document 2582302 available from www.condair.com) for
other mounting details.
The following is a list of installation requirements for mounting the Nortec RS humidifier:
The humidifier should not be mounted on hot surfaces, or surfaces that can freeze, or near vibrating
components, or on the floor. The Nortec RS Space units should not be installed near cold surfaces
or where the dew point may be reached.
The mounting surface must be able to withstand temperatures of 140-158 °F (60-70 °C) that can be
generated during operation of the humidifier.
The humidifier should be mounted on a wall or other suitable vertical surface that offers a sufficiently
high load-bearing capacity to support the full operating weight of the humidifier and accessories.
Refer to Table 8 on page 17 for the full weights of Nortec RS units, and Table 9 on page 19 for the
Nortec RS Space units.
The humidifier should not be used as a structural member. All piping connected to the unit must be
supported independently.
The Nortec RS must not be mounted to hot or very cold walls or near vibrating components.
c
a
d
A
A
Dimension
"a" in inch/mm
"b" in inch/mm
"c" in inch/mm
"d" in inch/mm
b
Weights
B
Netweight in lbs/kg
Operating weight in lbs/kg
Housing size
Small
Medium
2.13" (54.0)
2.13" (54.0)
17.56" (446.0) 21.89" (556.0)
3.16" (80.2)
3.49" (88.6)
12.00" (304.8) 16.00" (406.4)
Housing size
Small
Medium
59.97 / 27.2
88.85 / 40.3
88.83 / 40.2
145.06 / 65.8
B
Figure 13: Standard Humidifier Mounting - small and medium size units
28
Planning
2596995_0_EN_1905
Nortec RS
Dimension
"a" in inch/mm
"b" in inch/mm
"c" in inch/mm
"d" in inch/mm
c
d
Weights
A
Netweight in lbs/kg
Operating weight in lbs/kg
d
Housing size
Large
6.46" (164.0)
16.77" (426.0)
4.61" (117.2)
16.00" (406.4)
Housing size
Large
178.57 (81.0)
291.01 (132.0)
A
B
B
b
a
A
B
Figure 14: Standard Humidifier Mounting - large size units
Nortec RS
2596995_0_EN_1905
Planning
29
4.3.2
Water and Drainage Connections
The water and drain connections on the Nortec RS humidifier are located at the bottom of the unit. Refer
to Figure 15 and Figure 16.
The flexible bent hose (supplied) connects a short length of 7/8 in (22 mm) drain line to the drain cup
on the humidifier. The drain hose then empties into an air gap funnel connected to the building drain.
The water supply line connects to the fill valve through a NPT-to-BSPP adaptor (supplied).
Water drain connector ø1.18" (ø30 mm)
Water supply connector G 3/4"
Adapter G 3/4" / 1/2" NPT
Adapter G 3/4" / 1/2" NPT
(supplied with O-ring and gasket)
G 3/4"
1/2" NPT
Water supply pipe (min. inner diameter
0.47" (12 mm), supplied by others)
Filter valve or
Shut-off valve and 5 micron filter
(recommended, supplied by others)
ømin: 1.57" (40 mm)
30 ... 80 psi (2.0 ... 5.5 bar)
33.8 ... 77.0 °F (1...25 °C)
Drain hose (supplied)
– internal diameter ø1.18" (ø30 mm)
– Drain hose must be led to the left
– constant downslope (min 1.2°) to funnel
– if using DI or RO water, use supplied drain hose or stainless steel
pipe only able to withstand max. temperature of 140 °F (60 °C)
– hose must not touch funnel
Open funnel with trap
(supplied by others)
Figure 15: Overview water installation for single units Small ("S") and Medium ("M")
Water drain connector ø1.18" (ø30 mm)
Water supply connector G 3/4"
Adapter G 3/4" / 1/2" NPT
Adapter G 3/4" / 1/2" NPT
(supplied with O-ring and gasket)
G 3/4"
1/2" NPT
Water supply pipes (min. inner diameter
0.47" (12 mm), supplied by others)
Filter valve or
Shut-off valve and 5 micron filter
(recommended, supplied by others)
ømin: 1.57" (40 mm)
Drain hoses (supplied)
– internal diameter ø1.18" (ø30 mm)
– Drain hoses must be led to the left
– constant downslope (min 1.2°) to funnel
– if using DI or RO water, use supplied drain hoses
or stainless steel pipes only able to withstand max.
temperature of 140 °F (60 °C)
– lead each drain line in a separate funnel
– hoses must not touch funnel
30 ... 80 psi (2.0 ... 5.5 bar)
33.8 ... 77.0 °F (1...25 °C)
Open funnel with trap
(supplied by others)
Figure 16: Overview water installation for single units Large ("L")
30
Planning
2596995_0_EN_1905
Nortec RS
The following is a list of installation requirements for the water and drainage connections:
The drain line from the humidifier should be as short as possible, and empty into an air gap funnel
(with optional trap) before connecting to the building drain.
The drain line should have a constant minimum downslope of 1.2° to the air gap funnel without
touching its sides or bottom.
The drain line should have a minimum inner diameter of 1.57" (40 mm), and must be made of stainless steel, or copper pipe to handle temperatures up to 212 °F (100 °C).
The air gap funnel should be located away from the humidifier control cabinet to prevent rising steam
from damaging the electrical components in the cabinet.
Drain lines from large humidifiers with dual steam cylinders must empty into separate air gap funnels
before connecting to the drain. The combined drain line should have a minimum inner diameter of
1.57" (40 mm).
All water supply and drain connections must be installed to local plumbing codes.
4.3.3
Steam Distribution
The steam generated by the Nortec RS humidifier can be distributed into the conditioned environment
by duct distributors installed on air handling units or within supply ducts, or through built-on blower packs
(Nortec RS Space humidifier) or remote-mounted blower packs. In all cases, the steam distributors must
have a dispersal capacity equal to or greater than the humidifier steam output.
Visit www.na.condairhelp.com and use the free Condair online program - Humidifier Engineering
and Load-sizing Program (H.E.L.P.) to assist you with absorption distance calculations, selection of humidifiers, steam distributors, controls and accessories.
Additional information on the effects of humidity, relative humidity calculations, load calculations, and recommended design conditions can be found in the Condair Humidification Load
Calculation Manual (Condair document 2553856).
4.3.3.1
Duct Distributors
A variety of duct distributors are available for the Nortec RS humidifier to accomodate duct dimensions,
humidifier capacities and steam absorption distances. For more information on available duct distributor
systems refer to the documents listed in Table 11, which are available from www.condair.com.
Table 11: Duct Distributor Models
Model
Steam Capacity
lb/h (kg/h)
Duct Dimensions
in (mm)
Minimum**
Maximum**
ASD Tube
0-25*
(0-11)
10 (255)
66 (1675)
BSD Tube
0-35
(0-16)
12 (305)
102 (2590)
CSD Tube
0-115
(0-52)
24 (610)
138 (3503)
SAM-e
Maximum 1200**
(545)**
18×18 W
(457×457 W)
360×360 W
(9145×9145 W)
Mini SAM-e
Maximum 210**
(95)**
8×12 W
(203×305 W)
36x36 W
(914×914 W)
Condair Document
Number
2556592
1503529
* Max 22 lb/h (10 kg/h) for 10 in (255 mm) ASD tubes.
** Available in various standardized configurations.
Nortec RS
2596995_0_EN_1905
Planning
31
The following is a list of installation requirements for duct distributors to ensure steam is properly absorbed, and condensation does not occur in the ducts:
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.
Air flow in the duct across the distributor must be laminar over the entire calculated absorption
distance downstream of the distributor. Excessive turbulence may cause air stream collisions with
internal duct walls/components, which must be avoided.
The air velocity in the duct must be greater than 300 ft/min (92 m/min) to prevent steam migrating
to, and colliding with, the duct ceiling.
An air proving switch and high limit humidistat must be installed in the system. Refer to "Duct Distribution Control Design" on page 43.
Backpressure in the steam line combined with duct static pressure should not exceed exceed 5.5 in H2O
(1.37 kPa), or up to 10 in H2O (2.49 kPa) with the optional fill cup extension.
The atmospheric steam lines between the Nortec RS humidifier and the steam distributor must be
installed as described in "Atmospheric Steam and Condensate Lines" on page 34.
32
Planning
2596995_0_EN_1905
Nortec RS
4.3.3.2
Blower Packs
Condair blower packs create an air stream to allow 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 (except when mechanical
obstructions, localized variances in temperature, infiltrating air, or materials that have equalizing moisture
effects on the surrounding atmosphere are present). Refer to "Space Distribution Control Design" on page 45.
The Nortec RS Space humidifier comes fully factory-assembled with its own built-on blower pack (with
internal power supply, steam and condensate connections). The remote-mounted blower pack is capable
of dispersing 5-100 lb/h (2-45 kg/h) of steam, and requires an external 120 VAC, 15 A power supply, as
well as atmospheric steam line and condensate connections. Refer to Figure 17.
The blower pack has two speed settings – High speed setting which provides shorter absorption distances, and the Low speed setting which offers quieter operation but requires longer absorption distance.
For more information refer to the Blower Pack Installation Operation and Maintenance Manual (Condair
document 2582277, available from www.condair.com).
1
2
6
3
5
4
Figure 17: Condair Blower Pack
1
2
3
4
5
6
Remote-mounted blower pack
Steam line – must rise straight up 12 in (300 mm) before any bends
Built-on (Space) blower pack
Air gap funnel connected to building drain
Condensate line (alternate) with trap for remote-mounted blower pack routed to building drain
Condensate line with trap for remote-mounted blower pack connected to humidifier fill cup
The following is a list of requirements for installing remote-mounted blower packs:
The atmospheric steam line must rise straight up 12 in (300 mm) from the Nortec RS humidifier
before continuing on to the blower pack. Other steam line installation requirements are described
in "Atmospheric Steam and Condensate Lines" on page 34.
The condensate line from the blower pack can be routed to either an external drain or the humidifier
fill cup. It must have a constant minimum downslope of 1.2°, with no restrictions. The condensate
trap should have a diameter of 6 in (150 mm) and must be located minimum 12 in (300 mm) below
the blower pack condensate port.
Nortec RS
2596995_0_EN_1905
Planning
33
4.3.3.3
Atmospheric Steam and Condensate Lines
The Nortec RS humidifier can handle backpressures up to 5.5 inches of water column (1.37 kPa), or up
to 10 inches of water column (2.49 kPa) with the optional fill cup extension. When the combined effect
of backpressure in the steam line and the duct static pressure exceed this limit, it can adversely affect
operation of the humidifier. The steam line material, its diameter, length, slope and the number of bends
in the line affect the backpressure, which must be considered carefully when planning. Other factors
such as insulation of the steam line to reduce efficiency losses caused by the formation of condensate,
as well as condensate drainage to permit free venting of steam must also be considered.
The following is an overview of the requirements for atmospheric steam and condensate lines. For more
details refer to “Best Practices for Installing Steam and Condensate Lines” in the Nortec RS Installation
Manual (Condair document 2582302).
Steam Lines
Steam lines must be made of copper (MED Type-L) or stainless steel (minimum DIN 1.4301) exclusively. Use a Condair-supplied steam hose for short distances only. Steam lines made of any other
materials may adversely affect operation of the unit.
The length of the steam line and the number of bends in the line should be kept to a minimum to
minimize backpressure and reduce efficiency loss. The maximum recommended length of steam
line is listed in Table 12 on page 35.
Refer to Table 13 on page 35 for equivalent length of some common fittings when calculating total
equivalent length of the steam lines. Also refer to "Condensate Loss" on page 53 when calculating efficiency losses based on total equivalent length of the steam line.
The steam line should not have any restrictions, as it can increase backpressure. Backpressure in
the line combined with duct static pressure should not exceed 5.5 inches of water column (1.37 kPa),
or up to 10 inches of water column (2.49 kPa) with the optional fill cup extension.
Steam lines (from Nortec RS 90L/130/180 with dual steam cylinders or multiple humidifiers) should
not merge except at the steam distributor, and ONLY if the steam cylinders operate in parallel mode.
Refer to"Combining Steam Lines" on page 37.
The steam line should be connected to the steam outlet on the humidifier and the steam distributor
with short lengths of Condair steam hose, and secured with hose clamps.
The steam line must be supported independently so there is no load on the humidifier.
The steam line must have a constant minimum upslope of 10°, or a constant minimum downslope
of 2°, as shown in Figure 18.
The steam line must be insulated with a minimum of 1 in (25 mm) pipe insulation over its entire length
to minimize the formation of condensate.
Steam line should be properly supported to prevent sagging. If necessary mount condensate drain
at lowest points.
Minimum Upslope
12 in
(300 mm)
Minimum Downslope
2 in
(50 mm)
½ in
(12 mm)
10o
2
o
12 in
(300 mm)
Figure 18: Steam Line Slope
34
Planning
2596995_0_EN_1905
Nortec RS
Table 12: Steam Line Recommendations
Steam Line
Equivalent
Model
(Unit size) Maximum
Steam Line
Length
Copper
Pipe (MED
Type-L)
Diameter
Over-sized Steam Line**
Stainless Steel
(min. DIN 1.4301)
Pipe Diameter
Equivalent
Maximum
Steam Line
Length
RS 10
(S)
7 ft
(2 m)
14 ft
(4 m)
RS 15
(S)
12 ft
(3.5 m)
24 ft
(7 m)
RS 20
(S)
17 ft
(5 m)
34 ft
(10 m)
RS 30
(M)
22 ft
(6.5 m)
RS 45
(M)
43 ft
(13 m)
RS 65
(M)
RS 90
(M)
47 ft
(14 m)
RS 90 *
(L)
43 ft
(13 m)
86 ft
(26 m)
RS 130 *
(L)
RS 180 *
(L)
50 ft
(15 m)
100 ft
(30 m)
1-1/2 in
(40 mm)
1-1/2 in
(40 mm)
Copper
Pipe (MED
Type-L)
Diameter
86 ft
(26 m)
(45 mm
× 1.65 mm
wall)
Steam
Losses***
0.06 lb/h/ft
(0.09 kg/h/m)
44 ft
(13 m)
1-3/4 in
× 0.065 wall
Stainless Steel
(min. DIN 1.4301)
Pipe Diameter
2 in
(50 mm)
94 ft
(28 m)
2 in
× 0.065 wall
(50 mm
× 1.65 mm
wall)
0.11 lb/h/ft
(0.18 kg/h/m)
Condair Steam Hose
RS 10RS 180
10 ft
(3 m)
P/N 1328820 – 1-3/4 in (45 mm)
0.15 lb/h/ft
(0.22 kg/h/m)
*
Use a single steam line for each steam cylinder. Do not combine lines except at a distributor, and only if using the humidifiers in parallel
mode.
** Over-sized lines may require a reducer at the humidifier and the steam distributor.
*** Based on 1 in (25 mm) insulated copper pipe.
Table 13: Approximate Equivalent Length of Atmospheric Steam Line Fittings
Nortec RS
Nominal
Tube Size
in (mm)
Standard 90°
Elbow
ft (m)
45° Elbow
ft (m)
Side-outlet
Tee
ft (m)
0.75-0.875
(19-22)
2 (0.6)
1 (0.3)
4 (1.2)
1.5-1.75
(38-45)
3.5 (1.1)
1.75 (0.5)
7 (2.1)
3 (76)
5 (1.5)
2.5 (0.8)
11 (3.4)
4 (102)
8 (2.4)
4 (1.2)
15 (4.6)
2596995_0_EN_1905
Planning
35
Condensate Lines
Condensate line and trap must be made of 1/4 in copper (MED Type-L) or 3/8 in stainless steel
(minimum DIN 1.4301), or 3/8 in (9.5 mm) Condair condensate hose.
Condensate lines must connect into full size "Tee" fittings in the steam line. Refer to Figure 19.
Condensate lines must be installed at all low points in the steam line, and at horizontal-to-vertical
transitions in the steam line.
Condensate lines and traps must be installed at regular intervals on long steam runs, and the maximum distance between condensate lines is 15 ft (4.5 m). Refer to Figure 20 on page 37.
The condensate trap must be located a minimum of 12 in (300 mm) below the condensate port on
the steam distributor or the "Tee" fitting in the steam line. The trap diameter should be 8 in (200 mm).
The condensate drain line must have a constant minimum downslope of 1.2°, and may be connected
to the fill cup port on the top of the humidifier, or to the building drain.
Condensate from a SAM-e steam distributor or larger steam line should be connected to a drain
water cooler (if required by code) before emptying into the building drain.
Large volumes of condensate from multiple humidifiers or SAM-e systems should never be returned
to a single humidifier.
For safety reasons, condensate should not be routed to a sink used by personnel.
Individual condensate drain lines must be trapped independently before connecting into a single line.
Condensate lines should not have any restrictions, and all traps must be primed with water.
Condensate lines should be properly supported to prevent sagging.
Min.
12 in
(300 mm)
8 in
(200 mm)
Min.
12 in
(300 mm)
1 in
(25 mm)
1.2o
Minimum
Downslope
48 in
(1.2 m)
8 in
(200 mm)
1 in
(25 mm)
1.2o
Minimum
Downslope
48 in
(1.2 m)
Figure 19: Condensate Drain Lines
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Combining Steam Lines
The following is a list of installation requirements for combining steam lines:
Multiple steam lines (from a Nortec RS 90L/130/180 with dual steam cylinders, or multiple humidifiers) must not merge except at the steam distributor, and ONLY if the steam cylinders operate in
parallel mode – refer to Figure 20. If necessary, a specifically designed optional Condair adaptor must
be used to connect the steam lines to the steam distributor.
All requirements for steam and condensate lines must be satisfied. Refer to "Steam Lines" on page 34
and "Condensate Lines" on page 36.
1
15
ft
m
(4.5
ax.
)m
2
6
2
5
3
4
Figure 20: Combining Multiple Steam Lines
1
2
3
4
5
6
Nortec RS
SAM-e steam distributor
Condensate drain line, trap diameter 8 in (200 mm) and located minimum 12 in (300 mm) below condensate port or "Tee" fitting
Air gap funnel connected to building drain
Nortec RS humidifier – must operate in parallel mode
Steam line – constant minimum upslope of 10°, or a constant minimum downslope of 2°
"Tee" fitting, full size
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4.3.4
Electrical Connection
The power supply to the Nortec RS humidifier is routed into the bottom of the control cabinet. Refer to
Figure 21.
The following is a list of installation requirements for power connections:
The power supply cables should be sized to match the full voltage and current draw listed in the
specifications (refer to "Nortec RS Specifications" on page 17).
The external dedicated fused disconnect switch must be installed close to the humidifier so it can be
readily accessible when servicing the unit. The fusing must not exceed the maximum circuit protection listed in the specifications.
All wiring must be in accordance with national and local electrical codes.
1
2
Figure 21: Power Connection (front panel removed for clarity)
1
2
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Planning
Terminal block, high voltage supply
Power cable
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4.4
Control System Design
The Nortec RS humidifier is designed to be regulated by an automated control system utilizing either
analog or digital signals. All analog and digital control signal cables are routed to the humidifier through
the top of the unit – refer to Figure 22. Analog control signals (refer to "Analog Control Signals" on page 40)
are connected to the low voltage terminal strip in the humidifier, and digital signals (see "Digital Control
Signals" on page 41) from a computer or the BMS are communicated directly to the integrated control
board in the humidifier using a compatible digital communication protocol.
Regardless of the type of control signals, control components for the conditioned environment will vary
primarily depending upon the steam distribution method – duct or space (refer to "Duct Distribution Control
Design" on page 43 and "Space Distribution Control Design" on page 45). All modulating input signals to the
humidifier must be of the same type – either transducers (RH sensor), or humidistats (demand signals).
IMPORTANT! In addition to the analog or digital control signals, the 24 VAC security loop (consisting of On/Off devices) connected to Pin 1 and Pin 2 on the low voltage terminal strip must be closed
for the Nortec RS humidifier to operate. Condair highly recommends the use of a high limit humidistat and an air proving switch in the security loop for duct installations – refer to "Duct Distribution Control
Design" on page 43.
24VAC
External Safety Loop
Control signal (GND)
Control signal (IN)
Limit signal (IN)
Control signal (V+)
Limit signal (GND)
Safety circuit BP
Safety circuit BP
1
J8
J11
DRIVER B
REMOTE BOARD
2
J14
CONTROL BOARD
J12
5
3V
CR2032
J10
BAT
J6
J4
J7
SAB
LinkUp
BMS
24VGND GND + – GND + – GND + –
SD
DRIVER A
ACCESSORY BOARD
1 2 3 4 5 6 7 8 9
(RJ45)
(USB)
4
3
Figure 22: Control Signal Connections
1
2
3
4
5
Nortec RS
Control signal cables, analog and digital
Digital signal from BMS – Modbus or BACnet MS/TP
Digital signal from BMS – BACnet IP
Integrated control board (located behind touchscreen display)
Low voltage terminal strip, for analog signals
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4.4.1
Control Signal Input
4.4.1.1
Analog Control Signals
The Nortec RS humidifier can be regulated using up to two modulating analog input signals, and multiple
On/Off input signals for each steam cylinder. Analog controls can be supplied by Condair or by others.
The Nortec RS humidifier can be factory-configured to enable/disable modulating and On/Off control
signals, and set the signal range (refer to Table 14). The unit can also be field-configured using the touchscreen display.
Table 14: Nortec RS Acceptable Analog Control Signals
Control Type
Control Signal Type
Acceptable Signal
Modulating control and 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, 0-20 mA, 4-20 mA
On/Off
Dry contact, 24 VAC or 10 VDC
Security loop
Dry contact, 24 VAC
On/Off control and high limit signals
Nortec RS 90 RS130 and RS 180 humidifiers with dual steam cylinders have two low voltage terminal
strips (designated "A" and "B") to supply separate sets of control signals to each steam cylinder, so the
unit can be operated in series or parallel mode, as described in "General Description" on page 1.
All control signal wiring must use a minimum of 18 AWG, and the cable length should be kept as
short as possible.
Modulating Control
The Nortec RS humidifier can be operated with one or two modulating analog input signals per steam
cylinder. If two modulating input signals are used, both signals must be of the same type: demand signals
from an external controller, or transducer (RH sensor) signals from an external humidity sensor. In both
cases, the humidifier will not start steam production until the calculated system demand exceeds 3%.
Demand Signals: If the humidifier receives a demand signal, it calculates the desired steam production
level (as a percentage of the 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 responds to
the lowest of the two demand signals.
Transducer Signals: If modulating transducers (RH sensor) are used, the humidifier uses an internal
PI (proportional-integral) controller to calculate system demand for each channel input. The calculated
system demand value for each input channel will vary depending upon the configurable humidity setpoints, as well as proportional and integral functions of the internal controller. If two transducer signals
are used, two system demand values are calculated and the humidifier responds to the lowest of the two
calculated values. Transducers with a possible zero input are not recommended. The Nortec RS humidifier also supports an optional low and high humidity alarm warning with re-configurable humidity triggers.
Security Loop
The security loop connected between Pin 1 and Pin 2 on the low voltage terminal strip consists of 24 VAC
On/Off input devices that are part of the humidification system. The Nortec RS humidifier will not operate unless this circuit is closed. The security loop also allows On/Off control of the humidifier, and can
be used as feedback to indicate the functional status of the humidification system components critical
to the proper and safe operation of the humidifier.
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4.4.1.2
Digital Control Signals
The digital communications interface in the Nortec RS humidifier can be used to control the humidifier
output and change system configurations, or monitor its operation. Digital communication can be used
in conjunction with analog devices to regulate the humidifier operation. Condair recommends the use
of transducers for the control and high limit signals when using digital communications.
The Nortec RS humidifier integrates support for standard communication protocols such as BACnet IP,
BACnet MS/TP and Modbus RTU. The supported communication protocol can be selected and configured from the touchscreen display. With optional hardware kits, the Nortec RS humidifier can also be
configured to communicate using LonWorks, or BTL-certified BACnet IP and BACnet MS/TP protocols
– refer to Table 2 on page 4.
Note: If using BACnet MSTP, verify PICS/BIBBs details with the building network operator to ensure
compatibility. Refer to the BACnet manual (Condair document 2574199) for PICS/BIBBs settings.
BACnet
The Nortec RS humidifier uses the connector (J6) on the integrated control board to connect with the
BMS using the BACnet Master/Slave Token Passing (MS/TP) communications protocol, and the Ethernet
port (J21) to connect with the BMS using the BACnet IP communications protocol. Refer to BACnet,
LonWorks Supplemental Installation and Operation Manual (Condair document 2574199) for control
points and connection details.
The following is a list of installation requirements for BACnet communications:
18-24 AWG shielded, twisted pair cable with 120 Ω impedance is recommended for BACnet MS/TP
communications. Refer to the BMS supplier for recommended maximum length of communication
cables.
Category (CAT) -5, -5E, or -6 cable with RJ-45 terminations is recommended for BACnet IP communications.
Modbus RTU
The Nortec RS humidifier uses a three-pole connector (J6) on the integrated control board to facilitate
Modbus EIA-485, 2-wire communications with the BMS.
Refer to Modbus Installation and Operation Manual (Condair document 2560599) for the list of supported
Modbus parameters and connection/configuration details.
The following is a list of installation requirements for Modbus communications:
18-24 AWG shielded, twisted pair cable with 120 Ω impedance is recommended. CAT-5 cable is
also acceptable, but only uses two conductors and the cable shield – refer to the Modbus manual
for details.
To minimize signal loss, the cable run should not exceed 2200 feet (670 m).
To ensure communication reliability, Condair recommends that no more than 8 nodes are connected
to a single chain/bus.
LonWorks and BTL-Certified BACnet IP, Bacnet MS/TP
LonWorks and BTL-certified BACnet IP and BACnet MS/TP use an optional interface card mounted
on the integrated control board. Refer to BACnet/LonWorks Supplemental Installation and Operation
Manual (Condair document 2574199).
The following is a list of installation requirements for LonWorks and BTL-certified BACnet IP and
BACnet MS/TP communications:
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CAT-5 or better cable with RJ-45 terminations is recommended for BTL-certified BACnet IP communications.
18-24 AWG shielded, twisted pair cable with 120 Ω impedance is recommended for LonWorks and
BTL-certified BACnet MS/TP.
To use the BTL-certified BACnet or LonWorks protocols, jumper J7 on the integrated control board
must be Off. When the jumper J7 is On, the native Modbus protocol is enabled.
4.4.2
Linkup
The Linkup function allows linking of up to six integrated control boards (for a maximum of 12 steam
cylinders) in a "Main-Extension" configuration through the connector J10 on the integrated control board.
One set of control signals (analog or digital) is connected to the unit designated as the "Main" unit.
The Nortec RS humidifiers can then be configured to operate in parallel or in series mode to satisfy
humidity demand, as described in "General Description" on page 1. Humidifiers operated in series mode
permit a lower turn-down ration, however since the Nortec RS has 100% turn-down, it's typically recommended to use parallel mode. In parallel mode, all steam output from the units in the chain connect to
a common steam distribution system, which offers even wear on the units.
2
REMOTE BOARD
ACCESSORY BOARD
J11
SAB
LinkUp
BMS
24VGND GND + – GND + – GND + –
REMOTE BOARD
ACCESSORY BOARD
SAB
LinkUp
BMS
24VGND GND + – GND + – GND + –
CONTROL BOARD
LV
1 2 3 4 5
6 7 8 9
LV
1 2 3 4 5
6 7 8 9
4
J14
1 2 3 4 5
CR2032
J10
J12
LV
J14
CONTROL BOARD
J11
J8
3V
J10
CR2032
BAT
J6
3V
J4
J7
J10
J12
J14
CONTROL BOARD
J8
SD
J10
J11
BAT
J12
CR2032
J4
J7
J10
3
J6
3V
J10
BAT
J8
SD
J6
J4
J7
SAB
LinkUp
BMS
24VGND GND + – GND + – GND + –
SD
REMOTE BOARD
ACCESSORY BOARD
1
6 7 8 9
4
All inputs
Figure 23: Linkup Wiring
1
2
3
4
42
Planning
Main unit (all control signals to unit)
Extension unit #1 (no control signals to unit)
Extension unit #X (no control signals to unit)
Jumper (on all Extension units)
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Nortec RS
The following is a list of installation requirements for connecting Nortec RS humidifiers in a Linkup chain:
Up to 12 steam cylinders (equivalent of 1080 lbs/hr or 550 kg/h) can be connected together in the
Linkup chain.
18-24 AWG multi-strand, twisted pair, shielded cable must be used to connect the units.
All control signal inputs (humidistats/transducers and security loop) must be connected to the "Main"
unit only.
A jumper must be installed between the security loop pins "1" and "2" in the low voltage terminal
strip on all "Extension" units.
All control signal inputs must be connected to the low voltage terminal strip designated "A" in Nortec
RS 90/130/180 humidifiers with dual steam cylinders.
4.4.3
Humidity Control Design
4.4.3.1
Duct Distribution Control Design
When using the supply air duct for steam distribution, Condair highly recommends the use of an air
proving switch and a high limit humidistat in addition to a humidity controller. Environments with exterior
walls should also consider using an outdoor temperature sensor in the system. Refer to Figure 24.
10 ft (3 m) min.
4
3
2
1
Figure 24: Duct Humidity Control Location
1
2
3
4
Humidity controller (return air duct or inside the room)
High limit switch
Air proving switch
Outdoor temperature sensor (situated outdoors)
Air Proving Switch
Airflow is required for steam vented into the air supply duct to be absorbed before it can be distributed.
The normally-open dry contact Condair air proving switch connected to the humidifier's security loop
prevents humidification when the air handler is not operational.
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High Limit Switch
A high limit switch connected to the humidifier's security loop is used to limit the humidity in the supply
air from reaching saturation conditions, which can lead to water damage. Typically an On/Off duct humidistat will suffice for this application, but there are several applications where modulating transducers
or humidistats should be used, including the following:
•
When using a variable air volume (VAV) air handling system.
•
When a high limit switch must be installed after a bend or obstruction in the supply duct.
•
Applications that require very high air exchange rate, or 100% outdoor air.
•
Installations with short steam absorption distances.
The following installation requirement must be observed when using a high limit switch in a duct distribution system:
The distance between the steam distributor and the Condair duct humidistat or transducer should be
minimum 10 ft (3 m), or greater than the calculated absorption distance. Refer to Figure 24 on page 43.
Humidity Controller
The humidity controller detects the relative humidity in the conditioned environment and provide feedback to the humidifier. The Nortec RS humidifier is compatible with On/Off humidistats, and transducers
(RH sensor), but there are several applications where modulating transducers or humidistats should be
used, including the following:
•
When using an economizer, or variable air volume (VAV) air handling system.
•
Applications that require very high air exchange rate, or 100% outdoor air.
•
Applications that require narrow humidity tolerances.
The following installation requirements must be observed when using humidity controllers in a duct
distribution system:
Must be installed in a location representative of the conditioned environment. Controls installed in
exhaust or return ducts are preferred.
Wall-mounted controls can also be installed in the conditioned environment. However, they should
be located in an area that is not exposed to infiltrating air, and where there are no discharge diffusers
or localized variations in temperatures.
Outdoor Temperature Setback
An outdoor temperature sensor should be used to prevent condensation on windows or other surfaces
that are exposed to outdoor air. Condair outdoor temperature sensors are used in conjunction with
Condair humidistats that limit setpoints based upon outdoor temperature – refer to Table 3 on page 5
for part numbers.
The default setback for the Condair outdoor temperature sensor is shown in Figure 25 on page 45, which
can be reconfigured depending on the insulation quality of windows.
The following installation requirement must be observed when outdoor temperature sensor in a duct
distribution system:
The outdoor sensor must be installed in an area that is representative of the outdoor air temperatures – such as a fresh air intake duct, or located directly outside.
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Setpoint Limit (% RH)
45
40
35
30
25
20
15
10
o
F
-40
-35
-30
-25
-20
-15
-10
-5
0
5
o
C
-40
-31
-22
-13
-4
5
14
23
32
41
Outdoor Temperature
Figure 25: Default Temperature Setback
4.4.3.2
Space Distribution Control Design
When distributing steam directly into the conditioned environment the humidification system will require
a wall-mounted On/Off humidistat or transducer (RH sensor). Condair also recommends a high limit
switch. Environments with exterior walls should consider using an outdoor temperature sensor to prevent
condensation on windows/walls.
The following installation requirement must be observed when using humidity controllers in a space
distribution system:
Wall-mounted controls should be located in an area that is not exposed to infiltrating air, and where
there are no discharge diffusers or localized variations in temperatures.
1
2
Figure 26: Space Humidity Control Location
1
2
Nortec RS
High limit switch (recommended)
Humidity controller (inside the space)
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4.4.4
Remote Fault Indication Board
The optional remote fault indication board includes four relays that can be used to provide remote status
indication. Refer to Figure 27.
Each relay is described below:
The normally open relay is closed when the humidifier has power and the On/Off
switch is set to the On position.
Steam
The normally open relay is closed when the 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.
F1
1
2
1
2
3
100mA
4
J2 on Control Board
Analog Out
Unit On
Service
Steam Unit ON
1 2 3 4 5 6 7 8 9 10
Sensor Supply
Max. 60mA
Error
INTERNAL
EXTERNAL
Figure 27: Optional Remote Fault Indication Board
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4.4.5
Accessory Board
The optional accessory board includes four relays that can be used to control other accessory devices.
Refer to Figure 28.
Each relay is described below:
The normally open relay can be wired to activate or deactivate the optional valve for
flushing the water supply line for steam cylinder A.
Flush B
The normally open relay can be wired to activate or deactivate the optional valve for
flushing the water supply line for steam cylinder B.
Fan B
The normally open relay can be wired to activate or deactivate an external fan of the
air handling unit connected to steam cylinder B.
Fan A
The normally open relay can be wired to activate or deactivate an external fan of the
air handling unit connected to steam cylinder A.
F1
1
2
1
2
3
100mA
4
J3 on Control Board
Analog Out
Flush A
Flush B
Fan B
Fan A
1 2 3 4 5 6 7 8 9 10
Sensor Supply
Max. 60mA
Flush A
INTERNAL
EXTERNAL
Figure 28: Optional Accessory Board
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4.5
Preventative Maintenance
Regular maintenance of the Nortec RS humidifier is a requirement for maintaining the safety and operational efficiency of the humidifier. Maintenance of the humidifier is broken down into two categories:
–– Small maintenance
Cleaning of the scale collector tank (only for units equipped with a scale collector tank).
–– Extended maintenance
Cleaning of the steam cylinder and other components of the steam and water system.
The control software of the Nortec RS features a maintenance counter for the "Small maintenance" and
the "Extended maintenance". The maintenance counters are set at the initial commissioning based on
the water condition on site, however the maintenance counters can be adjusted at any time later to the
actual operational conditions.
Important! Independently of the maintenance counters the "Small maintenance" and the "Extended
maintenance" are to be carried out at least once a year.
Refer to the Operation and Maintenance Manual (Condair document 2582418) for the regular maintenance requirements for the Nortec RS humidifier.
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5
Total Humidification Load Calculation
5.1
Total Humification Load
The total humidification load is the sum of the three primary considerations: base humidification load,
moisture content equilibrium, and condensate losses. Each of these is described below.
Base Humidification Load
The base humidification load is defined as the humidification load required to increase the humidity of
the 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,
and is described in "Calculating Base Humidification Load" on page 50.
Moisture Content Equilibrium
When materials stored in a conditioned environments retain moisture content that is out of equilibrium
with the moisture content of that environment, it may have an equalizing effect on the environment (depending upon the hygroscopic properties of the material), thereby increasing or decreasing the relative
humidity. This must be be taken into consideration when calculating the total humidification load. Refer
to "Moisture Content Equilibrium" on page 52 for details.
Condensate Losses
Some steam in the steam distribution system will condense back to a liquid state due to convection heat
transfer, which reduces the gross output of the humidifier. These losses, as discussed in"Condensate Loss"
on page 53, must be taken into consideration when calculating the total humidification load.
Once the above considerations have been taken into account, it may be prudent to increase the capacity
of the humidifier, to allow for a safety margin, especially if the design conditions will require the unit to
regularly operate at or near or its maximum capacity.
Visit www.na.condairhelp.com and use the free Condair online program - Humidifier Engineering
and Load-sizing Program (H.E.L.P.) to assist you with absorption distance calculations, selection of humidifiers, steam distributors, controls and accessories.
Tutorials on using this program are available from the Literature & Media section of the
Condair website – www.condair.com.
Additional information on the effects of humidity, relative humidity calculations, load calculations, and recommended design conditions can be found in the Condair Humidification Load
Calculation Manual (Condair document 2553856) from www.condair.com.
Nortec EL
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49
5.1.1
Calculating Base Humidification Load
5.1.1.1
Total Unconditioned Air Supply Volume
The total volume of incoming unconditioned air (ft3/h), forced and naturally ventilated, 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, which
is equal to the total forced air volume.
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 natural ventilation system is one that does not rely upon direct mechanical means to provide air
ventilation to the conditioned environment. Air enters the conditioned environment 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.
5.1.1.2
Unconditioned Supply Air Moisture
Once the total volume of unconditioned supply air is known, the moisture content of the air supply must
be determined. To ensure the humidifier capacity will be able to satisfy design conditions, the calculations must be based on 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, Condair 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, the moisture content of the
unconditioned air supply can be determined as follows:
Supply Air Moisture (lb/ft3) = Maximum Supply Air Moisture (lb/ft3) × Lowest Humidity (% RH)
where,
50
•
Maximum Supply Air Moisture is the moisture content (lb/ft3) at 100% RH, obtained from Table 15 on
page 51 (imperial units) or Table 16 on page 52 (metric units) corresponding to the lowest anticipated
supply air temperature for the unconditioned air supply;
•
Lowest Humidity is the lowest anticipated humidity (% RH) for the unconditioned supply air source.
Total Humidification Load Calculation
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5.1.1.3
Conditioned Air Moisture
The moisture content for the designed air conditions must be determined next. To ensure the humidifier
capacity will be able to satisfy design conditions, the calculations must be based on the highest desired
design air temperatures and humidity.
Once the highest design temperature and highest design humidity for the application are known, the
moisture content of the conditioned air supply can be determines as follows:
Conditioned Air Moisture (lb/ft3) = Maximum Supply Air Moisture (lb/ft3) × Design Humidity (% RH)
where,
•
Max Supply Air Moisture is the moisture content at 100% RH, obtained from Table 15 on page 51
(imperial units) or Table 16 on page 52 (metric units) corresponding to the highest design air temperature for the conditioned environment;
•
Design Humidity is the highest required humidity (% RH) for the conditioned environment.
5.1.1.4
Base Humidification Load
The base humidification load is the moisture required to bring the unconditioned supply air to meet the
conditioned air requirements, and is calculated as follows:
Base Load (lb/h) = Total Supply Air Volume (ft3/h) × {Conditioned Air Moisture (lb/ft3) - Supply Air
Moisture (lb/ft3)}
where,
•
Total Supply Air Volume is the total volume of incoming unconditioned air (ft3/h), as described in
"Total Unconditioned Air Supply Volume" on page 50.
•
Conditioned Air Moisture is the moisture content (lb/ft3) of the conditioned air supply, as calculated
in "Conditioned Air Moisture" on page 51;
•
Supply Air Moisture is the moisture content of the unconditioned air supply, as calcualted in
"Unconditioned Supply Air Moisture" on page 50.
Table 15: Moisture Content of Air at 100% RH (Imperial Units)
Nortec EL
°F
lb/ft3
°F
lb/ft3
°F
lb/ft3
°F
lb/ft3
°F
lb/ft3
-20
0.0000343
41
0.000424
61
0.000857
81
0.00163
101
0.00293
-10
0.0000414
42
0.000440
62
0.000886
82
0.00168
102
0.00302
-5
0.0000500
43
0.000457
63
0.000916
83
0.00173
103
0.00310
0
0.0000686
44
0.000474
64
0.000946
84
0.00178
104
0.00319
5
0.0000871
45
0.000491
65
0.000979
85
0.00184
105
0.00328
10
0.000111
46
0.000509
66
0.00101
86
0.00190
106
0.00337
15
0.000141
47
0.000527
67
0.00104
87
0.00195
107
0.00347
20
0.000177
48
0.000547
68
0.00108
88
0.00201
108
0.00356
25
0.000223
49
0.000567
69
0.00111
89
0.00207
109
0.00366
30
0.000279
50
0.000587
70
0.00116
90
0.00213
110
0.00376
31
0.000291
51
0.000609
71
0.00119
91
0.00220
111
0.00387
32
0.000304
52
0.000630
72
0.00123
92
0.00226
112
0.00397
33
0.000316
53
0.000651
73
0.00127
93
0.00233
113
0.00408
34
0.000327
54
0.000674
74
0.00131
94
0.00240
114
0.00419
35
0.000340
55
0.000699
75
0.00135
95
0.00247
115
0.00430
2596995_0_EN_1905
Total Humidification Load Calculation
51
°F
lb/ft3
°F
lb/ft3
°F
lb/ft3
°F
lb/ft3
°F
lb/ft3
36
0.000353
56
0.000723
76
0.00139
96
0.00254
120
0.00491
37
0.000366
57
0.000747
77
0.00144
97
0.00262
125
0.00559
38
0.000380
58
0.000773
78
0.00149
98
0.00269
130
0.00634
39
0.000394
59
0.000800
79
0.00154
99
0.00277
135
0.00719
40
0.000409
60
0.000829
80
0.00158
100
0.00285
140
0.00812
°C
kg/m3
°C
kg/m3
Table 16: Moisture Content of Air at 100% RH (Metric Units)
°C
5.1.2
kg/m3
°C
kg/m3
°C
kg/m3
-30
0.000578
-29
0.000553
-10
0.00218
10
0.00943
30
0.0303
50
0.0828
-9
0.00238
11
0.0100
31
0.0320
51
0.0867
-28
0.000540
-8
0.00259
12
0.0107
32
0.0337
52
0.0908
-27
0.000540
-7
0.00281
13
0.0114
33
0.0356
53
0.0951
-26
0.000551
-6
0.00305
14
0.0121
34
0.0375
54
0.0995
-25
0.000573
-5
0.00330
15
0.0129
35
0.0395
55
0.104
-24
0.000606
-4
0.00357
16
0.0137
36
0.0416
56
0.109
-23
0.000650
-3
0.00385
17
0.0145
37
0.0438
57
0.114
-22
0.000704
-2
0.00415
18
0.0154
38
0.0461
58
0.119
-21
0.000769
-1
0.00447
19
0.0163
39
0.0485
59
0.124
-20
0.000845
0
0.00481
20
0.0173
40
0.0510
60
0.130
-19
0.000931
1
0.00516
21
0.0183
41
0.0536
61
0.136
-18
0.00103
2
0.00554
22
0.0194
42
0.0563
62
0.142
-17
0.00113
3
0.00594
23
0.0206
43
0.0592
63
0.148
-16
0.00125
4
0.00636
24
0.0218
44
0.0621
64
0.154
-15
0.00138
5
0.00680
25
0.0230
45
0.0652
65
0.161
-14
0.00152
6
0.00727
26
0.0243
46
0.0685
66
0.168
-13
0.00167
7
0.00777
27
0.0257
47
0.0718
67
0.175
-12
0.00183
8
0.00829
28
0.0272
48
0.0753
68
0.182
-11
0.00200
9
0.00884
29
0.0287
49
0.0790
69
0.190
Moisture Content Equilibrium
Materials stored in conditioned environments may retain moisture content that is out of equilibrium with
the moisture content of that environment. Depending upon the hygroscopic properties 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 release or absorb significant moisture from the atmosphere should
have their hygroscopic properties assessed by 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 absorption. Any hygroscopic product that is purchased
and sold by weight must be located in a carefully controlled environment.
52
Total Humidification Load Calculation
2596995_0_EN_1905
Nortec EL
5.1.3
Condensate Loss
Some steam in the steam distribution system will condense back to a liquid state due to convection
heat transfer, which reduces the gross output of the humidifier. An estimate of the condensate losses
throughout the distribution system should be determined to ensure the total humidifier capacity, less any
condensate loss, will still satisfy the total load requirement. The factors that contribute to condensate
losses are discussed below.
Steam Distributor Losses
The steam distributor is often the largest contributor to condensate losses in a steam distribution system.
The amount of steam lost due to condensation is dependent upon the design of the distributor system.
Refer to the steam distributor engineering guide for specific information on condensate loss.
Using Condair stainless steel air-gap insulation is one way to reduce distributor loses and
conserve energy. Additional information on calculating condensate losses, and savings from
the use of insulating distributors can be found in the Condair white paper “Condair Stainless
Steel Air Gap Insulation R Value”.
To compensate for condensate losses when using a SAM-e distribution manifold, the calculated humidification must be increased accordingly. Refer to Table 17 and Table 18 for SAM-e condensate losses.
Table 17: Condensate Losses for Un-insulated SAM-e Distribution Manifold
Air Velocity
fpm (m/s)
Atmospheric Steam Condensate Losses*
(% of Maximum Capacity)
55 °F (13 °C)
70 °F (21 °C)
500 (2.5)
15%
12%
1000 (5.1)
20%
15%
* These values may change due to other unknown variables, and as such should only be used as a guideline.
Table 18: Condensate Losses for Insulated SAM-e Distribution Manifold
Air Velocity
fpm (m/s)
Atmospheric Steam Condensate Losses*
(% of Maximum Capacity)
55 °F (13 °C)
70 °F (21 °C)
500 (2.5)
5%
4%
1000 (5.1)
10%
8%
* These values may change due to other unknown variables, and as such should only be used as a guideline.
For more information on specifying SAM-e insulation, refer to SAM-e Engineering Manual (Condair
document 1503529).
Nortec EL
2596995_0_EN_1905
Total Humidification Load Calculation
53
Supply Line Losses
Condensate losses per linear foot can be roughly estimated in a system with properly designed atmospheric steam lines. The total length of the atmospheric steam line must be taken into account, which
is the sum of the linear length of the steam pipe and equivalent length of every fitting in the line. For
equivalent lengths of common fittings see Table 13 on page 35. For design information on steam lines
refer to "Atmospheric Steam and Condensate Lines" on page 34.
Once total equivalent linear length is determined, Table 19 can be used to estimate the humidifier capacity
lost to supply line losses.
Table 19: Approximate Condensate Per Foot of Atmospheric Steam Line*
Steam Capacity
lb/h (kg/h)**
Nominal Steam Line
Size – Copper Tube
(MED Type-L)
in (mm)
Nominal Steam Line
Size – Stainless Steel
Tube (wall thickness
0.065 in)
in (mm)
Steam Loss in
Condensation
lb/h/ft (kg/h/m)
4-30 (1.8-14)
0.75 (19)
0.875 (22)
0.06 (0.09)
30-100 (14-45)
1.5 (38)
1.75 (45)
0.11 (0.18)
200-300 (91-136)
3 (76)
3 (76)
0.16 (0.23)
400-660 (181-299)
4 (102)
4 (102)
0.22 (0.33)
* Based on 1 in (25 mm) pipe insulation at 3 inches of water column (745 Pa) duct static pressure.
** Inclusive
54
Total Humidification Load Calculation
2596995_0_EN_1905
Nortec EL
6
Product Selection
The following checklist can be used to select the Nortec RS humidifier and its options and accessories.
However, Condair strongly advises you to visit www.na.condairhelp.com and use the free Condair online program – Humidifier Engineering and Load-sizing Program (H.E.L.P.) to assist you in sizing the humidifier
and selecting options and accessories. All part numbers are also available from www.na.condairhelp.com.
6.1
Humidifier and Options
Humidifier
Refer to "Total Humification Load" on page 49 for the required total capacity of the humidifier, then select an
available model (or combination of available humidifier models) from Table 8 on page 17. Enter the selection
below, making sure that the total capacity of the model(s) selected exceeds the total humidification load.
Humidifier Model and Capacity
RS 10 – 10 lb/h (4.5 kg/h)
Single unit Small
RS 15 – 15 lb/h (6.8 kg/h)
Single unit Small
RS 20 – 20 lb/h (9.1 kg/h)
Single unit Small
RS 30 – 30 lb/h (13.6 kg/h)
Single unit Medium
RS 45 – 45 lb/h (20.4 kg/h)
Single unit Medium
RS 65 – 65 lb/h (29.5 kg/h)
Single unit Medium
RS 90 – 90 lb/h (59.0 kg/h)
Single unit Medium
RS 90 – 90 lb/h (59.0 kg/h)
Double unit Large
RS 130 – 130 lb/h (68 kg/h)
Double unit Large
RS 180 – 180 lb/h (81.6 kg/h)
Double unit Large
Quantity
If more than one humidifier is to be supplied to satisfy the total humidification load, select this checkbox if all units are
to supplied with the same humidifier options.
Power
Refer to Table 8 on page 17 for the available power configurations, then select the specific power configuration for your site.
Humidifier Power Requirements
Voltage:
Phase:
Nortec RS
2596995_0_EN_1905
Product Selection
55
Options
Select options and accessories, as required. For details of the options and accessories refer to Table 3
on page 5 and Table 3 on page 5 respectively. Refer to Table 5 on page 9 for option part numbers.
Humidifier Options and Accessories
Part Number
Remote fault indication board (refer to "Remote Fault Indication Board" on page 46 for
additional details)
High Precision
RFI
P
Scale Management
SC
Accessory board (refer to "Accessory Board" on page 47 for additional details)
ACC
Mounting bar
MP
Mounting rack
MR
In-line water filter (refer to Table 3 on page 5 for part number)
Controls
The humidifier can be factory-configured to accept specific analog control signals, and thus eliminate
the need to configure it in the field. Refer to "Analog Control Signals" on page 40 for additional details.
Select the required configuration for control signal and channels. Refer to Table 6 on page 10 for part
numbers.
Control Signal Acceptance
Single
Channel
Dual
Channel
Part Number
0-5 VDC
0-20 mA
4-20 mA
0-10 VDC
0-16 VDC
1-5 VDC
2-10 VDC
0-20 VDC
56
Product Selection
2596995_0_EN_1905
Nortec RS
Select control accessories, as required, for automated regulation of the humidifier. Refer to "Control System
Design" on page 39 for details of the control system, and Table 3 on page 5 for details of accessories and
part numbers.
Control Accessories
Part Number
Air proving switch
Duct-mounted outdoor temperature setback sensor
Exterior-mounted outdoor temperature setback sensor
Plug-in transformer, 120 VAC to 24 VAC
Control humidistat (refer to Table 7 on page 11 for part numbers)
High limit humidistat (refer to Table 7 on page 11 for part numbers)
Select a digital communications protocol, if required, for interfacing the Nortec RS humidifier with building automation systems. Refer to "Digital Control Signals" on page 41 or BACnet/LonWorks Supplemental
manual (Condair document 2585293) for details.
Digital Communications Protocol
Part Number
BACnet IP, BACnet MS/TP
Standard
Modbus
Standard
Condair Online
Standard
BTL-certified BACnet MS/TP
BAC-BTL-MSTP
BTL-certified BACnet IP
BAC-BTL-IP
LonWorks
6.2
LON
Steam Distribution Equipment
Select a steam distributor that exceeds the production capacity of the humidifier(s), fits the duct/air handler size (if applicable), and accomodates the steam outlet connection to the humidifier. Refer to "Steam
Distribution" on page 31 for available methods.
If a SAM-e is required, refer to the SAM-e Engineering Manual (Condair document 1503529) for selection information and part numbers, then make the appropriate selections below.
SAM-e Configuration
Quantity
Steam inlet adaptor
–
SAM-e header
–
Part Number
Steam tubes
Nortec RS
Insulation (improves energy efficiency by as much as 70%)
–
Mounting Frame (required for vertical duct installation)
–
2596995_0_EN_1905
Product Selection
57
If a Steam Distributor is required, refer to the Steam Distributor Engineering Manual (Condair document
1506117) for selection information and part number, then make the appropriate selection below.
Steam Distributor Configuration
Quantity
Part Number
Steam distributor
If a blower pack is required, refer to the Blower Pack Installation Operation and Maintenance Manual
(Condair document 2582277) for additional details, then make the appropriate selection below.
Blower Pack Configuration
Blower pack (built-on)
Quantity
Part Number
–
BOBP
Blower pack (remote-mounted) – 110-120 VAC, 1 Phase, wall outlet
powered, for 1-3/4 in (45 mm) steam outlet
2579400
Blower pack (remote-mounted) – 110-120 VAC, 1 Phase, wall outlet
powered, for 7/8 in (22 mm) steam outlet
2579401
If steam and condensate hoses and accessories are required, make the appropriate selection below.
Refer to "Atmospheric Steam and Condensate Lines" on page 34 for additional details on steam hoses.
Steam and Condensate Hose and Accessories
Length
(inches)
Part Number
Steam hose, 1-3/4 in (45 mm) I.D.
1328820
Condensate hose, 3/8 in (9.5 mm) I.D.
1328834
Self-Actuated Condensate Cooler, 140 °F (60 °C)
–
1710010
24 V Electric Condensate Cooler, 140 °F (60 °C)
–
1710020
If tees are required, make the appropriate selection below. Refer to "Atmospheric Steam and Condensate Lines"
on page 34 for additional details on steam and condensate lines.
Steam Line Reducer and Tee
Tee adaptor, 1-3/4 × 1-3/4 × 3/8 in (45 × 45 × 9.5 mm) – for condensate drainage
Quantity
Part Number
1329635
To asssist you with purchasing and installing a Nortec RS humidifier, a "Sample Specification" and "Blank
Schedule" are included in Appendix A for your convenience.
58
Product Selection
2596995_0_EN_1905
Nortec RS
A
Appendix
A.1
Sample Specification
1.1
Work Included:
a. Nortec RS Series resistive element 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. AHRI 640, “Standard for Commercial and Industrial Humidifiers.”
e. ASHRAE Standard 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.
1.5
Submit water pressure requirements.
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.
Nortec RS
2596995_0_EN_1905
Appendix-A
i
ELECTRIC STEAM HUMIDIFICATION SYSTEM - MODEL NORTEC RS
PART 2 - PRODUCTS
2.1
Provide Nortec RS resistive element humidifier generating mineral-free, sterile steam for use
with potable, De-Ionized (DI), or Reverse Osmosis (RO) water. Packaged unit, wall mounted,
atmospheric steam generation using resistive heating element. Electrode 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.
ii. Embedded web interface for easy configuration and remote monitoring from any computer
with a web browser over a local area network (LAN) connection.
iv. USB interface for new software/feature upload and download of operational information.
v. Single or dual channel analog signal acceptance, supporting both demand and transducer
control. Ability to control setpoint from humidifier control when using transducer controls.
b. Packaged system with Condair resistive element technology:
i.
Incoloy based resistive heating element for steam production.
ii. Modulating output between 4% and 100% of rated capacity.
ii. Control accuracy of up to +/- 1% RH using optional Precision solid state relay control
and high precision humidistat.
iv. Separate scale collection chamber external from main boiling tank when using optional
Scale Management system.
v. Dual magnetic electronic float system, located outside of the boiling water to ensure accurate water level control and reduced maintenance. Systems using conductivity probes
or floats located within hot reservoir are not acceptable.
vi. Self-diagnostics during start-up of system to prevent unsafe operation of the unit[s]:
a. Fill valve check.
b. Float level check.
c. Drain pump check.
vii. Durable powder coated steel cabinet with zero side clearance requirement for minimal
footprint.
viii. Insulating air gap between plumbing and electrical compartment for increased electronic
reliability.
ix. Standard internal drain water tempering to ensure maximum 140°F [60°C] drain water.
External drain water cooler not acceptable.
x. Integral fill cup with minimum 1-inch [25 mm] air gap to prevent back siphoning.
xi. Automatic off-season shut-down [after 3 days of “no call”] will completely drain the boiling
tank[s] and automatically restart on call for humidity.
xii. Programmable drain settings too allow cycling small water quantities during operation
without interrupting steam production.
xiii. Integral design allowing easy installation and access for servicing.
ii
Appendix-A
2596995_0_EN_1905
Nortec RS
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.
A.2
Blank Schedule
A blank schedule is included on the following page for your convenience.
Nortec RS
2596995_0_EN_1905
Appendix-A
iii
iv
Appendix-A
2596995_0_EN_1905
Nortec RS
Tag
Area served
Type
Mftr.
Humidifier
Model
Duct
Dimen.
(W×H)
Airflow
(cfm)
Temp. Humidity Humidity
Capacity Input Voltage
Freq.
Entering Entering Leaving
Phase
(lb/h)
(kW)
(V)
(Hz)
(°F)
(% RH) (% RH)
Weight
(lb)
Notes
Notes
Notes
Warranty
Condair Inc. and/or Condair 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.
Sales and Service:
U.S.A.
835 Commerce Park Drive
Ogdensburg, New York 13669
CANADA
2740 Fenton Road
Ottawa, Ontario K1T 3T7
TEL: 1.866.667.8321
FAX: 613.822.7964
EMAIL: [email protected]
WEBSITE: www.condair.com
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