Page 1
Important: Read and save these instructions. This guide to be left with equipment owner.
2548006-A| 8 OCT 2009
RH
Installation and
Operation Manual
Includes installation, operation
maintenance and troubleshooting
information for your RH Electric
Steam humidifier
Page 2
Thank you for choosing Nortec.
INSTALLATION DATE (MM/DD/YYYY)
MODEL #
SERIAL #
CYLINDER #
Proprietary Notice
This document and the information disclosed herein are proprietary data of WALTER MEIER LTD. Neither this
document nor the information contained herein shall be reproduced, used, or disclosed to others without the
written authorization of WALTER MEIER LTD., except to the extent required for installation or maintenance of
recipient’s equipment. All references to the Nortec name should be taken as referring to WALTER MEIER LTD.
Liability Notice
Nortec does not accept any liability for installations of humidity equipment installed by unqualified personnel or
the use of parts/components/equipment that are not authorized or approved by Nortec.
Copyright Notice
Copyright 2008, WALTER MEIER LTD. All rights reserved.
Page 3
Contents
1 Introduction
2 Receiving and Unpacking
2 RH Models
3 Options and Accessories
5 Installation
6 Typical RH Installation
7 Location
8 Mounting with Keyholes
9 Plumbing
10 Steam Lines and Condensate
Returns
14 Electrical
15 External Controls
38 Maintenance and
Servicing
39 Required Maintenance
43 Extended Shutdown
44 Maintenance Checklist
45 Troubleshooting
47 General Troubleshooting
49 RH Faults
51 Wiring Diagrams
52 Spare Parts
56 Warranty
20 Options and Accessories
21 Start Up
22 Installation Check
23 RH User Interface
24 Start Up Procedure
26 Start Up Checklists
29 Operation
30 LED Status Lights
30 Selecting an RH Setpoint
31 Humidifier Components
34 How the Humidifier Works
36 Humidifier Configuration
Page 4
Introduction
CAUTION: Servicing
• Disconnect main power before any servicing.
• The plumbing and electrical compartments contain high voltage components and
wiring. Access should be limited to authorized personnel only.
• During and following operation of the humidifier, the steam and components in
contact with the steam such as the blower pack, steam lines, steam distributors,
and condensate lines can become hot and can burn if touched.
• Walter Meier does not accept any liability for installations of humidity equipment
installed by unqualified personnel or the use of parts/components/equipment
that are not authorized or approved by Walter Meier.
CAUTION: Electrical
• All electrical work should be done according to local electrical code.
• Electrical connection to be performed by a licensed electrician.
CAUTION: Plumbing
• Plumbing to be performed by a licensed plumber.
• Drain water from humidifier can be very hot. Do not drain to public sink.
• All plumbing work should be done according to local plumbing code.
CAUTION: Installation
• Do not mount on hot surfaces.
• Do not mount in area where freezing can occur.
• Do not mount on vibrating surface.
• Do not mount on floor.
• The RH produces steam at atmospheric pressure no devices which could block
steam output should be connected to the steam outlet.
• Steam lines must be installed so that no restriction can produce backpressure in
the humidifier.
• Regardless of selecting on/off or modulating control method, Nortec humidifiers
must have a closed circuit across its on/off security loop control terminal to
operate. Nortec highly recommends the use of a duct high limit humidistat.
1 | Introduction
Page 5
Receiving and Unpacking
1 Check packing slip to ensure ALL material has been delivered.
2 All material shortages are to be reported to Nortec within 48 hours from receipt of goods.
Nortec assumes no responsibility for any material shortages beyond this period.
3 Inspect shipping boxes for damage and note damages on shipping waybill accordingly.
4 After unpacking, inspect equipment for damage and if damage is found, notify the shipper
promptly.
5 All Nortec products are shipped on an FOB factory basis. Any and all damage, breakage or
loss claims are to be made directly to the shipping company.
Before Installation
1 Ensure that available voltage and phase corresponds with humidifier voltage and phase as
indicated on humidifier’s specification label.
2 Ensure that the dedicated external fuse disconnect is of sufficient size to handle the rated
amps as indicated on the specification label. Refer to local codes.
3 Report any discrepancy immediately to the site engineer.
4 Ensure sufficient clearances will be available as described in the Location section on page
7.
5 Ensure steam lines can be routed to distributor or blower pack as described in Steam Lines
and Condensate Returns on page 10.
MODEL:
XXXXXXXXXXXXXXXXXXXXXXXX
PHASE:
XXXX
VOLTS 1:
XXXXXXXXX
VOLTS 2:
XXXXXXXXX
VOLTS 3:
XXXXXXXXX
XXXXXXXXX
DATE:
HZ:
F.L. A:
F.L. A:
F.L. A:
XXXXX
XXXXX
XXXXX
MADE I N CANADA
S/N:
XXXXXXX
XXXXXX
KW:
XXXXXX
KW:
KW:
XXXXXX
Figure 1: Specification Label Location
RH Models
The RH is the most advanced residential steam humidifier available and provides steady and
reliable humidification for a home using the same proven cylinder technology as Nortec’s
commercial NHTC. The RH is available in 2 models. The duct model is designed for connection
to a steam distributor installed in a supply air duct or for connection to a remote blower pack.
The space model is designed for applications where humidity is to be introduced directly into
the space being humidified. The two models can be differentiated by the grille in the
humidifiers front cover, see Figure 2: RH Models.
Introduction | 2
Page 6
Space Model
(blower pack)
Duct Model
Figure 2: RH Models
Table 1: RH Specifications
Model - Part No. Volts Capacity
lb (kg)
110-120 4 (1.8) 1.5
RH Space - 2548758
RH Duct - 2548759
208 6.9 (3.1) 2.6 12.7
220-240 8 (3.6) 3.0
110-120 5 (2.3) 1.9
208 8.7 (4.0)
220-240 10 (4.6)
KW Amps Phase Max Ext
Fuse
1 20 202
3.3 15.9
3.8
1 20 202
Standard
Cylinder
Net/Full
Weight
lb (kg)
16 / 22
(7.5 / 10.0)
15 / 21
(7.0 / 9.5)
Options and Accessories
Nortec provides a complete line of options and accessories for every humidification application.
The following options and accessories are available and may have been delivered with your RH
humidifier. Refer to the installation instructions that came with the accessories for their proper
installation and operation.
Table 2: Options and Accessories
Option / Accessory Used For
Steam Distributors Adding steam into air ducts.
Remote Blower Pack Adding steam into a space remote from the humidifier.
Digital or Modulating Control Humidistats Controlling the output of the humidifier based on sensed RH.
Digital or Modulating High Limit
Humidistats
Air Proving Switches Insuring humidification only occurs when air is moving in a duct.
3 | Introduction
Preventing over humidification in a duct by shutting down or
throttling down the humidifier when duct RH gets high.
Page 7
Introduction | 4
Page 8
Installation
6 Typical RH Installation
7 Location
8 Mounting with Keyholes
9 Plumbing
10 Steam Lines and Condensate Returns
14 Electrical
15 External Controls
15 Control Location
15 Control Wiring
16 On/Off Control Wiring
17 Modulating Control Wiring
19 Optional Outdoor Temperature Reset
20 Options and Accessories
20 Remote Blower Pack
5 | Installation
Page 9
Typical RH Installation
Figure 3: Typical Humidifier Installation
Installation | 6
Page 10
Location
Mount on a suitable wall or vertical surface. Do not sit the on the floor to allow clearances
required for plumbing and electrical connections. Clearance dimensions shown are for
reference only and are the minimum required for maintenance of the humidifier. Consult local
and national codes before final location and installation. Nortec does not accept responsibility
for installation code violations.
• Install only in areas with ambient temperature 41-104°F (5 – 40°C) relative humidity
5 - 95%.
• When possible install below the steam distributor. If mounted above the steam distributor
take care to provide proper steam line routing and proper condensate traps.
• DO NOT locate the humidifier any further then absolutely necessary from the steam
distributor location as net output will be reduced as a result of heat loss through the steam
line.
• When possible, mount the RH humidifier at a height convenient for servicing.
Note: Do not mount on hot surfaces, where freezing can occur, vibrating surface, or
floor.
Overhead clearance
for s pac e m odels
only , see table
7 ft (2.1 m)
min. Height
for space
models on ly.
5-95%
Side clearance
for s pac e models
only, se e table
As Close as
Possible to Steam
Distributor
36 in. ( 92 c m )
duct m odel
in. ront learance
mf c
Additional front c learance
for space models,
see t abl e
Mount Humidifier
Level
Humidifier Output lb (kg) Side in. (cm)
<4 (1.8) 12 (30) 12 (30)
6 (2.7) 16 (40) 18 (46)
8 (3.6) 18 (46) 18 (46)
7 | Installation
24 in. ( 61 cm)
Min Height
Additional Clearance for Space Models Only
Figure 4: Mounting Location / Clearance
Overhead in. (cm) Front in. (cm)
36 (92)
42 (107)
48 (120)
Page 11
t
Mounting with Keyholes
1 The RH humidifier is wall mounted using a keyhole located on the back of the unit’s
cabinetry.
2 Use #8 x 2 in. (5 cm) screws mounted into 2x4 studs or better. 2 screws are needed, one for
hanging the unit and one for securing it so it will not lift off the keyhole.
3 Install the top screw so that 1/4 in. (6 mm) is exposed. Raise the unit and place the screw
head through the keyhole.
4 Make sure the unit is level and then insert and tighten the second screw through the bottom
hole. Tighten the top screw. See Figure 5: Mounting With Keyholes.
Note: Use screws longer than 2” (5 cm) if drywall or other spacer is present.
Keyhole
Insert screw so tha
1/4 in. (6 mm) ex pos ed,
hang unit, tighten
screw.
2x4 or Other
Structural
Member
Hole
Install Second Screw
after hanging
humidifier
Figure 5: Mounting With Keyholes
#8 x 2 in. ( 5 c m )
Wood Scr e w s
Installation | 8
Page 12
Plumbing
1/8 in. NP T
Use 1/ 4 in.
compression
fitting to c onnec t
supply line t o
1.2 in. (30 mm). OD
un-t hr eaded outlet
with factory s upplied
bent hos e and clam p.
Always ins tall a water
unit.
shut - off valv e.
Note:
1 Fill and drain lines
can also be routed
through opening in
back of cabinet.
2 Optional cov er
2548313 Is available
to c onceal plum bing
connect i ons.
Air gap requir ed. 2 1/2 in. to 7/8 in.
Copper reduc er is ideal. (NORTEC option
P/ N 2522172) Hos e m us t not
touc h the bottom of the funnel.
Min. 7/ 8 in. OD dr ain line.
Keep as shor t as possible.
Slope down t o f loor
drain or m ain drain.
Use 1/ 2 in. OD copper to within 4 ft ( 1.2 m) of hum idifier
Note:
• Drain water is very hot, do not drain to public sink.
• Do not use plastic pipe for drain.
*Pipe and water s hut-off v alv e not s upplied by Nor tec.
Figure 6: Water Supply and Drain Connection
• All water supply and drain line connections should be installed in accordance with local
plumbing codes.
• Supply water should at 30 to 80 PSIG and be between 150-1200 Microsiemens (Hardness
0-12 GPG). Consult factory for water conditions outside of this range. Water softener may
be used if conductivity remains in recommended range.
• Install water shut off valve before humidifier to facilitate servicing.
• The drain line should not end in a sink used frequently by personnel, or where plumbing
codes prohibit it. Route to a floor drain or equivalent for safety reasons.
• Insure drain line is adequately sized to provide free and easy draining and that an air gap is
installed as shown. A restricted drain can cause cylinder water to over concentrate and
result in poor operation.
• If a drain is not located near the humidifier use a condensate pump rated for hot drain water
such as Nortec’s Part Number 1429527.
For humidifiers installed in some cities including the City of Los Angeles:
A city-approved spring-loaded double ball CHECK VALVE must be installed by
contractor on the potable water inlet to the humidifier. Recommended valve
9 | Installation
manufacturer: Watts Regulator, phone number 508-688-1811, Size depending on
supply line 1/4”, 3/8”, or 1/2” NPT inlet and outlet, Model #7.
Page 13
Steam Lines and Condensate Returns
MAIN RULES FOR ATMOSPHERIC STEAM LINES
• Slope the steam lines
• Trap condensate (Use full size ‘T’ for Traps)
• Condensate traps must be a minimum of 3 in. (15 cm) in height or duct static
pressure + 2 in. whichever is greater.
• Steam lines must not have any restrictions which could cause back pressure.
• Insulate with 1.0 in. (2.5 cm) pipe insulation
• Follow recommended materials, size and length see tables.
Use Appropriate Slope Insulate Pipe
10 D egrees
n
o
i
t
c
e
r
i
D
m
a
e
t
S
1 ft (30 c m )
2 in.
(5 c m )
2 Degrees
S
t
e
a
m
r
D
i
e
o
t
i
c
S
t
e
a
m
D
i
0.5 i n.
(12 mm )
Steam Line
Material
Copper Tube
Stainless Steel
Tube
Nortec Hose < 10 < 3
Note: * These diameters require a reducer at humidifier and steam distributor connection. Use Nortec part number 1115444 at
humidifier to prevent backpressure caused by condensation collecting at the reduction.
Steam Output
(lb/hr)
1ft (30 cm)
Figure 7: Main Steam Line Requirements
Table 3: Recommended Steam Line Material
Steam Line Length
0-10 0-3
10+ 3+
0-20 0-6
20+ 6+
Table 4: Maximum Recommended Length of Steam Line
n
r
e
c
t
i
o
n
ft m
Distance
(ft)
1 in. (2.5 cm) pipe
insulation
Steam Line Description
3/4 in MED-L Tubing (7/8 in. OD)
*1 in. MED-L Tubing (1 1/8 in. OD)
1 1/2 in. MED-L Tubing (1 5/8 in. OD)
*2 in. MED-L Tubing (2 1/8 in. OD)
Part Number 1328810 (7/8”)
Possible Loss
(lb/hr)
Steam Line Size
(in)
5 8 1.0 3/4
10 15 1.5 3/4
NOTE: 1 Use one inch copper steam line for longer runs.
2 The use of steam line other then copper, stainless steel tube or Nortec supplied steam line will void the
warranty and may adversely effect the operation of the humidifier
Installation | 10
Page 14
2 x duct
height min.
4 ft (1.2 m) min. to
any o b stru ction
12 in.
(30 cm)
min.
Mount inside if
du c t wall is
> 3/4 in. (19 mm)
3/4 in. (19 mm)
max. w all
thickness
Mount distributor to
side or bottom of duct
Figure 8: RH Distributor Installation
Figure 10: Steam Distributor Above Humidifier (Hose)
Figure 11: Steam Distributor Below Humidifier (Hose)
2 x duct
height min.
4 ft (1.2 m) min. to
any obstruction
2/3 Duct
Height
12 in.
(30 cm)
min.
Mount ASD distributor
to side of duct
11 | Installation
Figure 9: ASD10 Distributor Installation
Page 15
12 in.(30 c m)
min. Radi us
2 in. ( 5 c m )
min.
1 ft (30 cm)
min. bef ore
any bend
Connect Condensate
Hose t o Fill Cup
1 ft (30 cm)
Condensate
line
Support
Brackets
Condensate
Trap
Connect Steam
Hose t o Cy li nder
Figure 10: Steam Distributor Above Humidifier (Hose)
Min 12 in.
(30 cm)
radius
Support B rac k et s
Hose will s often
over time
proper s upport
Is necessary
1 ft (30 cm)
min. Before
any bend
1 ft (30 cm)
min.
Condensate
Trap
To Drain
Figure 11: Steam Distributor Below Humidifier (Hose)
Installation | 12
Page 16
.
12 in
(30 cm)
min.
radius
Suppor t brackets
Hose will sof ten
over t im e
proper support
Is necessary
1ft (30 cm)
min. bef ore
any bend
Obstruction
2 in.
(5 cm)
min.1 ft (30 cm)
1 ft (30 cm)
min.
Use full size condensate tee
at low point. Slope lines up
to “ T” an d imm e diately after it.
Figure 12: Steam Distributor Below Humidifier With Obstruction (Hose)
To drain
To drain
Condensate trap
not 12 in ( 30 cm )
below distributor
No condensate
tr ap at vertical
transition
Steam line
not sloped
13 | Installation
Figure 13: Common Steam Line Errors
Page 17
Electrical
Caution: Wiring to be performed by a licensed Electrician.
Figure 14: Primary Power Connection
Installation | 14
Page 18
External Controls
Control Wiring
Controls are available from Nortec as accessories. If controls were not ordered with humidifier,
they must be purchased or supplied by others. The following information is relevant to all
controls, factory supplied or otherwise. For wiring use minimum 18 AWG and keep as short as
possible.
The RH humidifier can be operated with either On/Off controls only or with On/Off controls and
one modulating input. The modulating input can be from a duct high limit or humidity control
humidistat. See Humidifier Configuration on page 36 to configure the RH for modulation.
Control Location
Caution: Failure to wire the humidifier in accordance with the wiring instructions could
cause permanent damage. Such errors will void the warranty.
1 Air Proving Switch
• Locate so that it can sense air flow or lack of it.
2 Duct High Limit – Can be modulating or On/Off humidistat.
• Locate at least 10 feet from steam distributor or far enough that under normal conditions
steam is fully absorbed.
3 Humidity Control - Can be Modulating or On/Off humidistat
• Can be located either in return air duct (preferred) or in room being humidified.
• Avoid placing near discharge diffuser of humidified air.
• Mount in area representative of room humidity (draft, doorways, sunlight, or overhang such
as a shelf can affect reading).
15 | Installation
Note: Regardless of selecting on/off or modulating control method, Nortec humidifiers
must have a closed circuit across its on/off security loop control terminal to operate.
Nortec highly recommends the use of a high limit humidistat and an air proving switch
in series for this function.
Figure 15: Control Location
Page 19
On/Off Control Wiring
Figure 16: On/Off Controls
Figure 17: Digital On/Off Humidistat
Installation | 16
Page 20
Modulating Control Wiring
Figure 18: Modulating Controls
17 | Installation
Page 21
Figure 19: Modulating Control Wiring
Figure 20: Duct Sensor Wiring
Installation | 18
Page 22
Optional Outdoor Temperature Reset
Figure 21: Outdoor Temperature Reset
• Each Digital controller is equipped with an integrated reset function that can reduce the
setpoint during cold weather operation. This will prevent condensation on windows and
building structures. The above graph illustrates how the setpoint reset feature operates.
• This feature is enabled by removing the jumper from terminals 8 and 1 on the humidistat
and wiring the outdoor temperature sensor to these terminals.
• When the outdoor temperature setback feature is in effect, the humidistat will normally
display the calculated setpoint limit based on the outdoor air temperature. A snowflake will
also be displayed to indicate cold weather operation. When any key on the controller is
pressed, the LCD screen will display the customer specified setpoint for a short duration.
NOTE: Please refer to the Modulating Humidistat Installation Instructions for the Modulating Humidistat Wiring Diagram
19 | Installation
Figure 22: Outdoor Temperature Sensor
Page 23
Options and Accessories
Remote Blower Pack
A remote blower pack is available for the RH for applications where steam for humidification
must be introduced directly into the space being humidified but the humidifier must be installed
in a different location.
• For instructions on installing the remote blower pack refer to the installation instructions
supplied with it.
• The steam line instructions in this manual are also applicable to remote mounted blower
packs except the slope must be larger because the blower pack does not have a separate
condensate line and the maximum allowable steam line length is 4 ft (1.2 m)
Note:
• The blower pack requires additional clearance see the instructions that came with it.
• The steam line slope for the blower pack is 4 in. / 1 ft (10 cm / 30 cm).
Figure 23: Remote Mounted Blower Pack
Installation | 20
Page 24
Start Up
22 Installation Check
23 RH User Interface
23 On/Off or Modulating Operation
24 Start Up Procedure
25 Nortec Digital Controls
25 Modulating Control
25 On/Off Control
26 RH Pre-Start Up Checklist
21 | Start Up
Page 25
Installation Check
Before turning on power to the RH inspect the installation to insure that it was carried out
correctly. Refer to, to RH Pre-Start Up Checklist on page 26, and to the chapter on installation.
12 in.
min.
10 ft (3 m) min.
Filter, bend or
any other
obstruction.
High Li m it
On/Off
- In series between
terminal1and 2
Mod ulating
- Wired to termina 4.
2 x duct height
On/Off
Controls
(Air Proving)
in series
between
terminal
1 and 2
from fan or
trans ition
4 ft (1.2 m) min.
2/3 duct
height
(30 cm)
- Adequate slope
- No restrictions
- no kinks (hose)
- Condensate
traps on long
Mounting
- Unit Level
- Screw s into
structural
Spec Label
Air Ga p
Steam Li ne
runs
member
1/2 in line min to w ithin 4 ft ( 1 .2 m)
30-80 PSI
P Trap with
12 in (30 cm)
min drop
.
Not Plastic Dr a in,
Not to s ink.
Fused
Disconne ct
Correct
voltage /
amps / phase
per spec label.
Note: if a modulating control
is connected to the RH
then jumpe r J1 0 must
be re mo ve d .
Humidity Control
- in return duct or
location wh ich
represents
space (no drafts,
not by door, not by
- Wired to Term 4.
- n series between
I
humidifie d
diffuse r) .
Modulating
On/Off
term 1 and 2.
Figure 23: Installation Check
Start Up | 22
Page 26
RH User Interface
The RH has a simple to use user interface that includes two status LEDs that provide
information on current humidifier status. The On/Off/Drain switch can be used to turn the
humidifier On/Off and drain it for servicing or replacing the cylinder. See Figure 26: LED Status
Lights on page 30 for information on the LEDs.
Status LEDs On/Off/Drain Switch
(Turns humidifier
On/Off and drains
the cylinder)
Figure 24: RH User Interface
Caution: Do not leave the On/Off/Drain switch in the drain position for extended
periods of time. The drain valve solenoid may heat up and result in damage to the
valve and its wiring.
On/Off or Modulating Operation
From the factory the RH is configured to operate as an On/Off humidifier. It will run when 24
VAC from terminal 1 is fed back into terminal 2 through an On/Off humidistat and other security
devices in series. See On/Off or Modulating Control (J10) on page 37 for instructions on
configuring the RH to operate as a modulating humidifier.
23 | Start Up
Page 27
Start Up Procedure
1 Examine the humidifier and installation for damage and or improper installation.
2 Ensure that the front cover is in place and secured with its retaining screws.
3 Open the supply water shut off valve.
4 Turn on the mains power using the installed disconnect.
Warning: Damaged Units or improperly installed units must not be operated. Damaged or
improperly installed units may present a danger to persons and property.
5 Turn the On/Off switch on the front of the humidifier to On.
The humidifier will perform a self-diagnostic sequence during which the LED’s and internal
components will be momentarily activated.
If an error is detected during the self-diagnostic sequence the humidifier will not start. The
yellow status LED will flash in sequence to indicate the detected fault. See RH Faults on
page 49 for information on diagnosing and correcting faults.
After the system test the humidifier is in normal operation mode.
6 Check and adjust the control setpoint on the control and high limit humidistat.
7 When the external humidistat generates a demand for humidity and the security loop is
closed the green humidifying LED on the front of the humidifier will light up, the power relay
on the control board will engage, the fill valve will activate (after a delay) and the cylinder will
slowly fill with water.
Note: While the cylinder is filling with water there should be no water flowing down the drain. If
water is flowing down the drain it can indicate excessive backpressure or a leaking drain
valve. See chapter on troubleshooting starting on page 45.
8 It can take 5 – 10 minutes for the water to be heated up by the submerged electrodes and
for steam to be produced.
Note: If operated on low conductivity water it may take several hours for the RH to reach
full output capacity. This is normal. During this time the humidifier will not perform any
drains and the conductivity of the water in the cylinder will increase.
Start Up | 24
Page 28
Nortec Digital Controls
Nortec provides optional On/Off and Modulating digital controls. Figure 25 show the function
and meaning of the Digital Control’s display and buttons. All controls are available either wall
mounted or with a remote sensor for duct mounting.
Humidity (RH %)
Indicates the
humidistat is on.
A half moon
indicates it is off.
Output signal is shown on
modulating controller
proportional to the demand.
State of On/Off humidistat
Snowflake indicates the
setpoint is being
overridden by outdoor
temperature.
Power button turns
off the humidiistat if
pressed for 2 seconds
Setpoint (RH%)
Option button accesses
sensor calibration.
See troubleshooting
Increase / Decrease Setpoint
Figure 25: Modulating and On/Off Digital Control Operation
Modulating Control
The modulating controls use a PI control algorithm to transmit a 0-10V control signal to the
humidifier. Adjust the setpoint to the desired setting by using the up/down arrow buttons on
the controller.
On/Off Control
The On/Off controls use a PI control algorithm to open and close a relay that opens and closes
the humidifier’s On/Off loop. Adjust the setpoint to the desired setting by using the up/down
arrow buttons on the controller.
Note: It is possible to field calibrate Nortec digital controls if the displayed humidity is found to
be different than a known trusted source. See chapter on Troubleshooting starting on
page 45.
25 | Start Up
Page 29
RH Pre-Start Up Checklist
Unit Serial #: _________________ No. of humidifiers: _______ Tag: _______________
Unit type: _______ __________ Voltage: ________V/_____ph
Cylinder type: Customer/Job: Address:
WATER QUALITY:
Well water F City water F Softened water F
HUMIDIFIER MOUNTING: (Clearances around the unit Acceptable Obstruction)
• Level Front Clearance 36 in. F
STEAM LINE(S):
• Material F Diameter / Size F
• Slope up (min 2 in/ft) F Slope down (min 0.500 in/ft) F
• Low point condensate traps F No hose kinks / Restrictions F
• Type of Insulation
CONDENSATE LINE(S):
• P Trap min 6 in or duct press + 2in F P Trap min 12 in drop F
WATER LINE:
• 1/2 in to within 4ft of unit F Water pressure: 30-80 psig F
DRAIN LINE:
• Air gap within 3 ft of the unit F Diameter / Size F
CYLINDER:
• Seated in drain valve and secured yes F no F
WIRING:
• Wiring connections and connectors secured yes F no F
CONTROLS:
• On / Off / Security loop devices working correctly yes F no F
• Jumper J10 set to
Modulating (removed) F
Or
On/Off (installed) F
• Control Location
• High Limit Location
POWER:
• Voltage, amp, fuse per Spec Label: yes F no F
• Disconnect switch located close to humidifier yes F no F
• Panel Number
Inspected by:
Date of inspection: ______/_______/______
Company:
Start Up | 26
Page 30
RH Start Up Checklist
Unit Serial #: _________________ No. of humidifiers: _______ Tag: _______________
Unit type: _______ __________ Voltage: ________V/______ph
Cylinder Type: Customer/Job: Address:
PRELIMINARY:
• Pre-start-up checklist completed? yes F no F
If no, perform Pre-Start-up Checklist before starting humidifier.
START-UP PROCEDURE:
The prerequisites for the humidifier filling and contactor pulling in to make steam are as follows:
• Front cover in place and secured with screws yes F no F
• Water supply valve opened yes F no F
• Mains disconnect switched on yes F no F
• Turn On/Off switch on yes F no F
• On/Off security loop (Terminal 1 and 2) closed. yes F no F
• Fan security (Terminal 8 and 9) closed yes F no F
CONTROLS:
• Installed controls match configuration yes F no F
• Control Setpoint: High Limit Setpoint:
• > 3 VDC on terminal 4 (Modulating Humidistat) yes F no F
or
• Terminal 1 and 2 closed (On/Off Humidistat) yes F no F
The Humidifier will undergo a self-test when the power is turned on activating the LED’s and other
internal components.
If the above listed prerequisites are fulfilled the humidifier will start filling the cylinder and begin
normal operation.
Note: Most water does not contain enough conductivity for full boil on initial start-up. Units
will need to concentrate the water over a time period (hours to days).
REMARKS:
Started by:
Company:
27 | Start Up
Date of Start Up: _______/_______/______
Page 31
Start Up | 28
Page 32
Operation
30 LED Status Lights
30 Selecting an RH Setpoint
31 Humidifier Components
32 Description of Components
33 Humidifier Schematic
34 How the Humidifier Works
34 Steam Generation
34 Drains
34 Steam Distribution
35 Steam Line
35 Condensate Return
36 Humidifier Configuration
29 | Operation
Page 33
LED Status Lights
The RH user interface includes 2 LED’s which provide information about the humidifier’s current
status.
Green LED On
Indicates steam is being produced
Green LED Blinking
Indicates humidifier is on but there is
no requirement for humidity..
Yellow LED On
Indicates that water level is high
Yellow LED Flashing
Indicates the contr oller has detected
a fault and he humidifier has shut
down. (See table 7 on page47
for meaning of flashes)
Figure 26: LED Status Lights
Yellow LED Steady On
When the yellow LED is steady on (not flashing) it indicates that the high water sensor
has interrupted filling of the cylinder. The LED is on for information only and unless it
persists for an extended period of time it does not require any action.
Selecting an RH Setpoint
The optimum humidity setpoint depends on the reasons that a space is being humidified. The
“ASHRAE Handbook. HVAC Applications” recommends specific design relative humidities for
specific applications. See also Nortec publication “When You Need Humidity” (Form 124A) for
more information on humidity settings.
Health and Comfort - The benefit of humidity is most pronounced for health and comfort in the
40-60% range. A humidity setting of 45-50% is recommended for this purpose to prevent over
humidifying.
Temperature Setback - In cold climates it is often necessary to reduce the humidity level in a
space to prevent build up of condensation on the inside of exterior walls, windows, and trim. It
is highly recommended that the temperature setback function of the Nortec Digital controls be
used under these conditions to prevent damage from condensation. The digital control with an
outdoor temperature sensor installed will automatically setback the humidity setpoint to
correspond with outdoor temperature.
Duct High Limit – The duct high limit is intended to prevent saturation and wetting in duct work
at high load conditions. Nortec recommends a setting of 85% for the duct high limit. It may be
necessary to reduce this setting If the duct work is very cold or in contact with exterior cold
surfaces.
Operation | 30
Page 34
t
r
h
Humidifier Components
Condensate Return
Fill Cu p
Cylinder Plug
Cylinder
High Water Senso
Plug
Steam Outle
Blowerpack
High Voltage
Terminal Block
Transformer
Power Relay
Control Boar d
Fill Va lve
Drain ValveDrain Canal
Control Terminal
Strip
On/Off/Drain Switc
Figure 27: RH Humidifier Components
31 | Operation
Page 35
Description of Components
Table 5: Humidifier Components
Component Function of Component
Blowerpack
Condensate Return
Control Terminal
Strip
Cylinder Plug
Cylinder
Drain Canal
Drain Valve
Control Board
Fill Cup
Fill Valve
High Voltage
Terminal Block
Disperses steam generated by the humidifier directly into a space being
humidified. Consists of a steam distributor, fan, power supply, and
mounting bracket.
Provides a connection to return condensate to humidifier.
Terminal strip for connecting external controls to humidifier and
interfacing with other equipment.
Power connectors to electrodes in cylinder.
Holds electrodes in water. Current between electrodes generates heat
used to generate steam.
Combines cylinder drain water and fill cup overflow into a single drain
outlet.
Drains water from humidifier.
Controls all functions of the humidifier’s operation and provides input
and output connections to humidifier components.
Provides an air gap for backflow prevention.
Controls flow of water into humidifier.
Primary power connection from remote disconnect to humidifier.
High Water sensor
Plug
On/Off/Drain Switch
Power Relay
Steam Outlet:
Transformer:
Used to detect max water level in cylinder.
Turns power on/off to humidifier controller and drains the cylinder for
servicing. Note: Turn off humidifier disconnect to shut off primary power
to the humidifier.
Turns on/off power to cylinder electrodes based on a signal from the
humidifier’s controller (mounted on control board).
Connect to steam line with steam hose (shown with steam hose to
blower pack).
Steps primary voltage down to 24 VAC for the controller and internal
components such as the fill valve and drain valve.
Operation | 32
Page 36
Humidifier Schematic
33 | Operation
Figure 28: Humidifier Schematic
Page 37
How the Humidifier Works
The RH is an atmospheric steam generator that uses heat generated by electrical current
flowing between submerged electrodes to generate heat and steam. The RH is designed for air
humidification via steam distributor or blower pack.
Steam Generation
• Once the unit receives a demand signal and the safety loop between terminal 1 and 2 is
closed the humidifier closes the contactor and measures the current.
• If the demand is lower than the actual output the inlet valve is kept closed and output is
reduced by letting the water level in the cylinder decrease by evaporation.
• If demand is higher than the actual output after a brief delay the fill valve is activated and
water flows into the fill cup. Water from the fill cup flows into the bottom of the cylinder
through a hose connected to the drain valve housing.
Note: The cylinder is gravity fed from the fill cup. If backpressure from the steam line is too
high it will cause water to back up in the fill cup and flow down the overflow line to the
drain.
• ·A soon as the water in the cylinder comes in contact with the energized electrodes current
flows through the water. The resistance of the water to the electrical current generates heat
and in turn steam. The more electrode is covered by water the higher is the current and
output. The unit continues to fill until the current matches demand or the high water sensor
detects a high water level.
• The RH repeats the fill and boil down cycle repeatedly to match output to demand.
• Over time minerals in the water will adhere to the cylinder’s electrodes. The humidifier will
automatically fill to a higher water level to maintain full capacity during the life of the
cylinder. Eventually because of scale formation it will no longer be possible for the
humidifier to reach its full capacity. The RH’s software monitors this condition and when
detected will stop operating and flash the yellow LED in a repeating sequence of 4 flashes.
Drains
• As steam is produced minerals are left behind increasing the conductivity of the water. The
RH’s patented auto adaptive cycle will monitor the water conductivity and perform drains to
maintain the water at optimal conductivity for peak performance.
• The auto adaptive cycle provides the longest cylinder life in combination with keeping the
tightest control and most efficient use of water during the entire cylinder life.
Steam Distribution
Steam generated by the humidifier may be introduced into the air in several different ways. The
most common method for adding the steam into the air is to mount a steam distributor tube in
a supply air duct as shown in Figure 35, Humidifier Schematic. For introducing steam directly
into a room humidifier built in or remote mounted blower packs are used see Figure 29: Remote
Blower Pack.
Operation | 34
Page 38
Steam Line
The steam line between the cylinder steam outlet and the distributor may be Nortec steam
hose, copper pipe, or stainless steel pipe or tube. The RH is an atmospheric steam generator
so it is very important no restrictions are present in the steam line and that the steam line is
sized properly to carry the full output capacity of the humidifier. See Steam Lines and
Condensate Returns on page 10 for information on selecting steam lines.
Condensate Return
Whenever steam is distributed condensate is formed in the distribution system and steam
distributor, manifold, or blower pack. Insulating steam lines is one important way to reduce the
amount of condensate formed. Steam lines are sloped so that condensate does not collect in
the lines and create a restriction to steam flow. The condensate must be collected and
removed from the system so that it does not build up and leak into the duct (or room if blower
pack is used). Condensate can be returned to the RH fill cup to reduce water waste or can be
fed to drain.
35 | Operation
Figure 29: Remote Blower Pack
Page 39
Humidifier Configuration
The RH is factory configured to operate under most conditions without the need for any changes
to its configuration. If required several settings can be made using jumpers on the RH’s control
board. The output of the RH can also be reduced by using a potentiometer on the RH’s control
board. See Figure 30: RH Control Board Jumpers for location of jumpers and the capacity
adjustment potentiometer.
Note: Nortec recommends not making any configuration changes unless they are required and
that any changes to the RH’s settings be performed by a qualified technician.
Figure 30: RH Control Board Jumpers
Caution: Never adjust jumpers other than those listed in this section. Other jumpers are
factory set and must not be changed.
Capacity Adjustment
The Capacity adjustment potentiometer can be accessed through the clearance hole in the
cover of the electrical compartment. It can adjust the capacity of the humidifier between 100%
and 30% of its rated output. (Factory setting = 100% output).
100%30%
Figure 31: Capacity Potentiometer Adjustment
Operation | 36
Page 40
A
A
On/Off or Modulating Control (J10)
The RH’s output can be controlled by either an On/Off humidistat or a modulating humidistat.
To set the RH to operate with a modulating humidistat remove Jumper J10. (Factory setting =
jumper Installed , On/Off operation)
J10 Removed– Modulating operation, the controller monitors the demand signal on
terminal point 4 of the control terminal strip and adjusts humidifier output to match it.
J10 Installed - The RH is configured for On/Off operation. The controller will ignore any
modulating signals even if they are connected.
Modulation Offset (J13)
The RH controller can be configured to work with a modulating humidistat with 4-20 mA or 2-10
VDC output. Modulation offset can be configured with jumper 13. (Factory setting = Jumper
Removed, 0-10 VDC or 0-20 mA control signal)
J13 Removed – Controller is configured for a 0-10 VDC or 0-20 mA control signal.
J13 Installed – Controller is configured for a 2-10 VDC or 4-20 mA control signal.
Note: For mA control a 500Ω register is required between terminals 3 and 4 on the low voltage
control terminal.
Table 6: Control Jumper Configuration
Resulting Control J10 J13
On/Off Installed No Affect
Modulating 0-10 VDC or 0-20 m
Modulating 2-10 VDC or 4-20 m
Removed Removed
Removed Installed
Ground Fault Interrupt (GFI) (J15)
Ground current leakage can occur when the humidifier performs drains. With jumper J15 the
RH can be configured to turn off the power to the electrodes whenever a drain takes place.
J15 Removed – The power relay is on during drains to control cylinder water concentration.
J15 Installed – The power relay is turned off during drains to control cylinder water
concentration.
37 | Operation
Page 41
Maintenance and
Servicing
39 Required Maintenance
39 Cylinder Spent Fault
39 Replacement Cylinder
40 Removing the Cylinder
41 Drain Valve Cleaning
42 Installing the New Cylinder
43 Extended Shutdown
43 Starting After Extended Shutdown
44 RH Maintenance Checklist
Maintenance and Servicing | 38
Page 42
Required Maintenance
The RH humidifier has been designed to require very little maintenance. Regular maintenance
consists of checking the humidifier to insure it is in good condition, replacing the cylinder when
the software advises that the cylinder is spent and cleaning out the drain valve whenever the
cylinder is replaced.
Cylinder Spent Fault
When the cylinder is spent the RH will stop operating and the yellow LED will flash in a repeating
pattern of 4 flashes. See Table 8: Troubleshooting RH Faults on page 49 for more information
on other flash sequences. At this time the cylinder must be replaced.
The steam cylinder is disposable and must be replaced at end of cylinder life. Cylinder life is
dependent on water supply conditions and humidifier usage.
Caution: Failure to replace the cylinder at the end of cylinder life will result in improper
operation and may result in damage to the humidifier. Nortec is not responsible for
any damages resulting from, or attributed to, the failure to replace a spent cylinder
(see Manufacturer’s Warranty).
Note: Nortec recommends keeping a replacement cylinder in stock throughout the
humidification season. This will prevent possible downtime when the humidifier
reports cylinder end of life.
Replacement Cylinder
The label on the existing cylinder identifies the cylinder type in its top left corner. When ordering
a cylinder always quote the three or five digit model number on the label, the humidifier’s serial
number and the humidifiers voltage. Serial number and voltage are located on the specification
label on the left side of the humidifier.
39 | Maintenance and Servicing
Figure 32: RH Cylinder
Page 43
.
Removing the Cylinder
Warning
• Disconnect main power at the external disconnect before any servicing.
• The inside of the humidifier’s cabinet contains high voltage components and wiring.
Access should be limited to authorized personnel.
1 Drain the existing cylinder by switching the On/Off/Drain switch to the Drain position. Let
the humidifier drain until no more water is flowing out to drain (usually not more than 10
minutes).
2 Turn the humidifier On/Off/Drain switch to off.
3 Close supply water shut off valve.
4 Turn off power to the humidifier with the external disconnect.
5 Remove the two screws securing the front cover.
6 Remove the cylinder plugs from the cylinder pins by pulling vertically.
7 Using a flat screwdriver loosen the hose clamp where the hose is connected to the cylinder.
8 Tip the top of the cylinder forward to pivot it out of the steam hose. When free of steam
hose lift the cylinder out.
Cy lin der P lug
lift v ertic a lly
Cylinder
Tilt cy lin der
forward to clear
hose and then
lift from drain
Hose Clamp
Cover Screws
valve.
Tilt cove r
forw a r d to
remove.
On /O ff/D ra in Switch
Figure 33: Cylinder Removal
Maintenance and Servicing | 40
Page 44
Drain Valve Cleaning
Always clean the drain valve before installing a new cylinder. Scale from the spent cylinder may
have fallen into the drain valve and could prevent its proper operation. To properly clean the
drain valve it must be removed and disassembled.
Note: Be sure to reattach the green ground wire to reduce the risk of electrical shock.
1 Disconnect spade terminals from the drain valve.
2 Remove the screw holding the green ground wire and the two screws holding the valve to
the drain pan.
3 Squeeze the tabs of the spring clamp holding the hose to the drain valve and slide it up the
hose. Pull hose from drain valve. Lift the drain valve from the drain pan.
4 Unsnap red coil cap on solenoid and remove the solenoid from the valve.
5 Loosen brass nut holding actuator to plastic housing with a wrench and disassemble
actuator.
6 Clean actuator components and valve housing (inlet port, outlet port, and cylinder port). Put
new o-ring that was supplied with new cylinder into valve.
7 Reassemble actuator making sure tapered end of spring is oriented as shown. Tighten
brass nut 1/4 turn past hand tight.
8 Clean out end of hose and reattach to valve. Slide hose clamp back in place and place valve
into drain pan.
9 Secure valve with 2 screws and attach green ground wire to solenoid.
Figure 34: Drain Valve
41 | Maintenance and Servicing
Page 45
Plunger
Spring
(Note Orientation)
Sleeve
and
Solenoid
Figure 35: Drain Valve Actuator Assembly
Installing the New Cylinder
CAUTION: Make sure the new cylinder is the same model as the one that was removed.
Model number is on top left corner of cylinder label.
1 Insert cylinder into drain valve. Tilt cylinder forward and fit end of steam hose to steam
outlet. Tip cylinder back into place.
2 Tighten hose clamp being careful not to over tighten and crush the plastic cylinder steam
outlet.
3 Attach color-coded cylinder plugs to the corresponding color-coded cylinder pin. Push down
completely. Connect high water sensor plug. Spring-loaded plugs should fit snuggly onto
the cylinder pin. Replace if they are loose or damaged.
4 Replace the humidifier cover and secure with two screws.
5 Turn on power to humidifier with the external disconnect.
6 Open supply water shut off valve.
7 Turn the humidifier On/Off /Drain switch to On.
Maintenance and Servicing | 42
Page 46
Extended Shutdown
Should it be required to disconnect power to the humidifier for a period of extended shut-down,
always drain the cylinder first.
1 Switch the On/Off/Drain Switch to the Drain position.
2 Wait until the humidifier is completely drained (usually takes less than 10 minutes).
3 Turn the On/Off /Drain switch to the off position.
4 Shut off power to the humidifier with the external disconnect.
5 Close the supply water shut-off valve.
Note: As long as the RH is powered, it will automatically drain the cylinder when there
has not been a call for humidity for an extended period of time. This feature will
reduce or prevent the possibility of corrosion of the electrodes and the accumulation
of algae and bacteria growing in the cylinder. The cylinder will remain empty until
there is a call for humidity at which time the fill valve will open and refill the cylinder.
The unit will go through its normal process for optimum operation.
Starting After Extended Shutdown
1 Check to see the humidifier has not been damaged and the installation has not been
altered. Refer to the Chapter on Start Up.
2 Turn on the power to the humidifier with the external disconnect.
3 Turn the On/Off/ Drain switch to the Drain position.
4 Wait until there is no water flowing to drain. It usually takes less than 10 minutes.
5 Follow the start up procedure in the chapter on Start Up.
43 | Maintenance and Servicing
Page 47
RH Maintenance Checklist
Model #: _________________
Serial #: _________________ Tag: ________
Cylinder #:
CHECK CYLINDER
• Cylinder spent), yellow LED flashing 4 times in sequence.
(If Yellow LED is On and cylinder is not new then cylinder will have to be replaced soon.)
REPLACE CYLINDER
Cylinder drained.
•
•
Disconnect open, On/Off/Drain switch off, water shut off valve closed, cover removed.
• Cylinder removed
• Drain valve removed / cleaned / new O-Ring
• Drain valve installed / ground wire attached.
New Cylinder Installed New cylinder model #
•
(Should be same as removed cylinder)
• Cylinder plug colors match cylinder dots.
• Cylinder plugs snug and in good condition.
• High Water Sensor plug snug and in good condition.
• Cover replaced, water shut off valve open, On/Off /Drain switch On, Disconnect Closed
SYSTEM CHECK
• Yellow Led flashing? No Yes Flash Sequence?
(See Troubleshooting Chapter for actions if yellow LED is flashing)
• Primary power disconnect turned off
Cylinder plugs snug and in good condition.
•
• Electrical wiring not loose and in good condition,
• Steam hoses and steam lines in good condition / No kinks in hose,
• No Signs of water leaking around humidifier, steam line, condensate returns,
Inspected by: Date of inspection: _______/_______/______
Company:
Maintenance and Servicing | 44
Page 48
Troubleshooting
46 Organization of Troubleshooting Chapter
46 Troubleshooting Requirements
47 General Troubleshooting
47 Humidifier
48 Steam Distributors
48 Blower Pack
48 Digital Humidistat
49 RH Faults
49 LED Flash Sequence
49 Clearing a Fault
51 RH Wiring Diagram
45 | Troubleshooting
Page 49
Organization of Troubleshooting Chapter
The troubleshooting chapter is broken down into 2 sections.
General Troubleshooting Deals with troubleshooting incorrect humidifier operation,
steam line and plumbing issues without any control
software faults.
Humidifier Warnings and Faults Deals with faults that are generated by the humidifier’s
control software.
CAUTION: Be aware, when troubleshooting, that the humidifier is powered by high voltage
and familiarity with both good practices and wiring of the humidifier is recommended.
Any troubleshooting that requires opening the cabinet should be done by qualified
personnel.
NOTE: Most humidifier faults are not caused by faulty equipment but rather by improper
installation. A complete fault diagnosis always involves a thorough examination of the
entire system. Often, the steam hose connection has not been properly executed, or the
fault lies with the humidity control system.
Troubleshooting Requirements
• Ensure the installation meets the installation requirements outlined in the Installation
Chapter of this manual.
• Familiarize yourself with the operation of the humidifier by reading the Operation Chapter of
this manual.
• Wiring diagram for specific for your humidifier is installed on the inside of the humidifier
door. A generic copy of the RH wiring diagram is also included at the end of this chapter for
reference purposes.
• When contacting your local representative or Nortec for troubleshooting assistance, please
ensure the serial number has been obtained for reference purposes.
Troubleshooting | 46
Page 50
General Troubleshooting
The following section provides general guidelines for troubleshooting the RH humidifier and
auxiliary components. For detailed troubleshooting information refer to the manuals that were
provided with the auxiliary equipment and to Table 8: Troubleshooting RH Faults after in this
chapter.
Humidifier
Table 7: General Troubleshooting
Symptom Cause Corrective Action(s)
Nothing happens when On/Off
switch is turned on.
Humidifier will not humidify or
not reaching RH setpoint
1 Fuse blown 1 Check inline fuse between transformer
and control board.
2 Incorrect Voltage 2 Check voltage against spec label and
correct.
3 Step Down Transformer not
outputting 24VAC
4 Incorrect primary power jumper 4 Check that jumper on high voltage
1 Safety loop open
2 No demand signal
3 Replace the transformer
terminal block is connected between P
and terminal corresponding to supply
voltage.
1a Check if there is 24 VAC at terminal
2.
1b Check wiring and operation of On/Off
devices connected to terminal 1 and
2.
1c Check jumper is installed in fan
safety loop, terminal 8 and 9.
2 Check voltage between terminal 3 and
4. For demand configuration 35% of
full-scale signal must be present for
humidifier to start.
3 Not configured correctly for
4 Capacity has been manually
5 Low conductivity water 5 Check if yellow LED is on. If operated
6 Incorrect configuration
Humidifier has faulted and
yellow LED is flashing
47 | Troubleshooting
1 Software has detected an
On/Off or modulating control
limited
(Modulating or On/OFF)
abnormal condition
3 Check that J10 on control board is
removed for modulating control and
installed for On/Off control.
4 Check Manual Capacity adjustment
potentiometer. Clockwise increases
capacity.
on low conductivity water it may take
several hours for the RH to reach full
output capacity. This is normal.
During this time the humidifier will not
perform any drains and the
conductivity of the water in the
cylinder will increase.
6 Check J10 on control board, remove if
a modulating humidistat is being used.
1 Refer to Table 8: Troubleshooting RH
Faults.
Page 51
Steam Distributors
Symptom Cause Corrective Action(s)
Distributor spitting out water
Condensation in duct 1 Installation clearances not
1 Distributor not level 1 Use support at end o distributor to
2 “P” Trap too close to distributor 2 “P” Trap must be a minimum of 12 in
3 Condensate line not sloped
sufficiently
4 Trap blocked 4 Check that water flows through trap.
5 Steam line not insulated 5 If steam line is long condensate build
6 Incorrect steam line installation 6 Check that steam line has been
observed
ensure it is level.
(30 cm) below the distributor to
ensure flow. Relocate if required.
3 Sufficient slope to insure flow is
required. Reinstall if required.
Clear out if blocked.
up could overload distributor
condensate port. Insulate line to
improve efficiency and install
additional condensate traps as
required.
installed with condensate traps and
slope per installation instructions on
page 10.
1 Refer to distributor installation manual
for required clearances. Relocate
distributor if required.
2 Design conditions changed 2 Check supply air temperature and
humidity to determine if conditions
have changed.
3 High limit not functioning 3 Check setting and operation of high
limit. Replace if defective.
Blower Pack
Symptom Cause Corrective Action(s)
Blower not operating 1 No power to blower pack 1a Check power connection to blower
pack.
1b Ensure unit is humidifying. The
blower will not operate if the
humidifier is not generating steam.
Digital Humidistat
Symptom Cause Corrective Action(s)
Humidistat Reading incorrectly 1 Sensor out of calibration 1 Check reading against known reliable
instrument. If out of calibration it can
be field calibrated ±10%. Refer to
humidistat documentation for
calibration instructions.
Troubleshooting | 48
Page 52
RH Faults
The self-diagnostic system built into the RH is continually monitoring the operation of the
humidifier. When an abnormal condition occurs that cannot be self corrected by the software
the RH will turn off power to the cylinder, drain the cylinder, and annunciate the fault using the
yellow status LED.
LED Flash Sequence
To differentiate between different fault conditions the yellow LED is flashed in different
sequences. Table 8 lists the fault sequences that can be displayed, their meaning, possible
cause and suggested corrective actions.
Clearing a Fault
• Check the flash sequence against the list of fault messages and take any necessary actions
to correct the cause(s) as outlined in Table 8: Troubleshooting RH Faults.
• Power cycle the humidifier with the On/Off switch waiting 10 seconds between turning it off
and on.
Table 8: Troubleshooting RH Faults
Yellow LED System Detected Cause Corrective Action(s)
1 flash
Excess Current
Current has exceeded
130% of max
1 Drain blocked water over
concentrated
2 Drain solenoid not energized,
water over concentrated
3 Filling too fast, fill valve
damaged
4 Filling too fast, wrong fill valve 4 Check for correct fill valve in
5 Water supply too conductive 5a Contact Nortec
6 Humidifier short cycling 6a Check if high limit or other
1 Clean the drain line
2 Check and correct wiring to
drain valve.
3 Replace the fill valve
parts list, replace if incorrect
representative for
recommendation on alternate
cylinder
5b Change the water supply
On/Off control is cycling
On/Off in less than 5
minutes. Check location and
setting of high limit.
6b Reduce the output by
turning down the capacity
potentiometer.
49 | Troubleshooting
7 Wrong cylinder installed 7 Install correct cylinder model
8 Cylinder Spent but not
detected by software
9 Condensate from other
source
10 Back pressure 10 Eliminate back pressure
8 Replace the cylinder (see
maintenance chapter)
9 Remove condensate returns
other than from steam line.
Page 53
Table 8: Troubleshooting RH Faults (Continued)
Yellow LED System Detected Cause Corrective Action(s)
2 flashes
No Current
Fill valve activated for
long time but high water
level not reached.
Fill should be faster than
1” per minute.
1 Drain valve leaking or stuck
open
2 Water shut off valve closed 2 Open shut off valve
3 Fill Valve strainer blocked 3 Clean out strainer on fill valve
4 High system back pressure 4a Check for kinked hose
5 High water sensor not
connected
6 Low water conductivity 6a Check conductivity of water.
1 Clean drain valve or replace
(see maintenance chapter)
inlet.
4b Check for proper
condensate removal (see
installation chapter)
4c Install fill cup extension
5 Check that cylinder plug with
white marker is connected to
short electrode with a plastic
well around it and to control
board.
If less than 150
microsiemens contact factory
for recommendation.
6b Add 1/4 teaspoon of salt to
fill cup and restart unit.
3 flashes
4 flashes
No Current, High Water
Water level at top of
cylinder with no current
Cylinder Spent
Electrodes covered with
scale.
1 Primary wire not looped
through current transformer.
2 High water sensor plug is on
an electrode pin.
3 Cylinder plugs installed
incorrectly
1 Cylinder electrodes are
covered with scale and
humidifier cannot meet
demand
1 Open disconnect, rewire
primary wire through current
transformer.
2 Install high water senor plug
on cylinder pin with shroud
around it.
3 Check that cylinder plugs
colors match markers next to
electrodes on cylinder and
that white marked cylinder
plug is connected to short
electrode located in plastic
well.
1 Replace cylinder with same
model number (see
maintenance chapter)
Troubleshooting | 50
Page 54
RH Wiring Diagram
K2
P8
High Water
K3
Capacity
adjust
P7
120 VAC
208 VAC
240 VAC
Hot
Hot
Hot
Cylinder
P1
P2
P3
P4 P5 P6
Install J10 for
On/Off
control only
J10
G
Y
Status
Lamps
On/Off/Drain
Switch
VAC
24 VAC
240/208/120
Transformer
208
120 P
240L1
Neutral
Ground
S
Internal
External
1.5 Amps
12
Note:
208
120 P
240L1
Hot
208
120 P
240L1
Hot
Install jumper
from P to
terminal
Ground
corresponding
to mains
voltage.
Ground
24 VAC
3
Security Loop
Fill V
8
919
4
24 VAC
Control Signal (+)
Control Ground (-)
Drain V
20
ROOM Steam Distributor
M
Fan Start (+)
Fan Start (--)
Fan Security
Note:
Room Steam Distributor
not included with RH
+
_
TB2
~
TB1
~
Duct humidifier
51 | Troubleshooting
Rh Humidifier 120/208/240 Vac
INTERNAL WIRING DIAGRAM
DIAGRAM No. 2548760 REV. B DATE: Sept. 9, 2009
Figure 36: RH Wiring Diagram
Page 55
Exploded View and Spare Parts List
Spare Parts| 52
Page 56
RH Spare Parts
53 | Spare Parts
Figure 37: RH Spare parts
Page 57
Table 9: RH Spare Parts List
Item Nortec Part No. Description
1 Reference Housing, Plastic Back, RH
2 2547403 Housing, Plastic front cover, RH
3 Reference Cabinet, Electrical Backplate, RH
4 2548001 Cabinet, Drain Pan, RH
5 2548000 Coverplate, Electrical, RH
6 2548313 Cover, bottom, RH
7 2548683 Distributor, Plastic, RH Blower
8 2548314 Fan, 80X80mm Tangential, 24Vdc
9 Reference Bracket, fan, RH
10 2548008 PWB, Power Supply, RH Blower Pack
11 Contact Factory Condensate Hose Kit, RH Blower Pa ck
12 1323020 GROUND CLAMP
13 2547999 Transformer Multi tap 120/208/240 to 24V
14
15 1323097 Switch Rocker SPDT 5A-250V
16 1583008 LENS CLEAR 1/4in - LED DISPLAY
17 1519002 Cylinder 202
18 2547963 Fill cup assembly, RH
19 2547964 Cylinder Plug kit, RH
20 1313244 VALVE, FILL ASSLY 005-020 LBS
21 1455000 GASKET FOR FILL THRU CAB
22 1639011 COMP FTTG 1/4in ELBOW ASSLY
23 1456000 VALVE DRAIN 93BEIGE+24V COIL
24 2547997 Gasket, Drain canal, round, RH
25 1102503 Drain Canal Round
26 2547998 Hose, 7/8" drain preformed 90deg, RH
27 2548118 Grill, built in blower, RH
28 1106649 Preformed Steam Hose to Blower Pack
2549518 PCB RH Duct 10 lbs/hr
2549519 PCB RH Space 8 lbs/hr
Spare Parts| 54
Page 58
55 | Warranty
Page 59
Warranty
Walter Meier Inc. and/or Walter Meier 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.
Warranty | 56
Page 60
U.S.A.
Walter Meier (Climate USA) Inc.
826 Proctor Avenue
Ogdensburg, NY 13669
CANADA
Walter Meier (Climate Canada) Ltd.
2740 Fenton Road
Ottawa, Ontario K1T 3T7
TEL: 1.866.NORTEC1
FAX: 613.822.7964
EMAIL: northamerica.climate@waltermeier.com
WEBSITE: www.humidity.com
Certificate No. 002419
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