nor-tec RH User manual

RH
Installation and
Operation Manual
Includes installation, operation
maintenance and troubleshooting
information for your RH Electric
Steam humidifier
2548006-A| 8 OCT 2009
Important: Read and save these instructions. This guide to be left with equipment owner.

Thank you for choosing Nortec.
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.
INSTALLATION DATE (MM/DD/YYYY)
MODEL #
SERIAL #
CYLINDER #

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
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
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

1 | Introduction
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.

Introduction | 2
Receiving and Unpacking
1Check packing slip to ensure ALL material has been delivered.
2All 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.
3Inspect shipping boxes for damage and note damages on shipping waybill accordingly.
4After unpacking, inspect equipment for damage and if damage is found, notify the shipper
promptly.
5All 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
1Ensure that available voltage and phase corresponds with humidifier voltage and phase as
indicated on humidifier’s specification label.
2Ensure 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.
3Report any discrepancy immediately to the site engineer.
4Ensure sufficient clearances will be available as described in the Location section on page
7.
5Ensure steam lines can be routed to distributor or blower pack as described in Steam Lines
and Condensate Returns on page 10.
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.
MADE IN CANADA
MODEL:
VOLTS 1:
F.L.A:
KW:
XXXXXXXXXXXXXXXXXXXXXXXX S/N: XXXXXXX
XXXXXXXXX
PHASE: XXXX HZ:
XXXXX
XXXXXX
DATE:
XXXXXXXXX
VOLTS 3: XXXXXXXXX
VOLTS 2: XXXXXXXXX
F.L.A: XXXXX
F.L.A: XXXXX XXXXXX
XXXXXX
KW:
KW:

3 | Introduction
Figure 2: RH Models
Table 1: RH Specifications
Model - Part No. Volts Capacity
lb (kg)
KW Amps Phase Max Ext
Fuse
Standard
Cylinder
Net/Full
Weight
lb (kg)
RH Space - 2548758
110-120 4 (1.8) 1.5
1 20 202
16 / 22
(7.5 / 10.0)
208 6.9 (3.1) 2.6 12.7
220-240 8 (3.6) 3.0
RH Duct - 2548759
110-120 5 (2.3) 1.9
1 20 202
15 / 21
(7.0 / 9.5)
208 8.7 (4.0) 3.3 15.9
220-240 10 (4.6) 3.8
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
Preventing over humidification in a duct by shutting down or
throttling down the humidifier when duct RH gets high.
Air Proving Switches Insuring humidification only occurs when air is moving in a duct.
Space Model
(blower pack)
Duct Model

Introduction | 4

5 | Installation
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

Installation | 6
Typical RH Installation
Figure 3: Typical Humidifier Installation

7 | Installation
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.
Figure 4: Mounting Location / Clearance
Note: Do not mount on hot surfaces, where freezing can occur, vibrating surface, or
floor.
Side clearance
for space models
only,see table
36 in.(92 cm)
in. ront learance
ductmodel
mf c
Additional frontclearance
for space models,
see table
24 in.(61 cm)
Min Height
Mount Humidifier
Level
As Close as
Possible to Steam
Distributor
5-95%
Overhead clearance
for space models
only, see table
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 ft (2.1 m)
min. Height
for space
models only.
36 (92)
42 (107)
48 (120)
Additional Clearance for Space Models Only
Overhead in. (cm) Front in. (cm)

Installation | 8
Mounting with Keyholes
1The RH humidifier is wall mounted using a keyhole located on the back of the unit’s
cabinetry.
2Use #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.
3Install the top screw so that 1/4 in. (6 mm) is exposed. Raise the unit and place the screw
head through the keyhole.
4Make 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.
Figure 5: Mounting With Keyholes
Note: Use screws longer than 2” (5 cm) if drywall or other spacer is present.
Install Second Screw
after hanging
humidifier
#8 x 2 in.(5 cm)
Wood Screws
Insert screw so tha
t
1/4 in. (6 mm) exposed,
hang unit, tighten
screw.
2x4 or Other
Structural
Member
Keyhole
Hole

9 | Installation
Plumbing
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.
Note:
•Drain water is very hot, do not drain to public sink.
•Do not use plastic pipe for drain.
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
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.
1.2 in. (30 mm).OD
un-threaded outlet
with factory supplied
benthose and clamp.
Always install a water
shut-offvalve.
1/8 in. NPT
Use 1/4 in.
compression
fitting to connect
supply line to
unit.
*Pipe and water shut-offvalve not supplied by Nortec.
Use 1/2 in.OD copper to within 4 ft(1.2 m) ofhumidifier
Note:
1 Fill and drain lines
can also be routed
through opening in
back ofcabinet.
2 Optional cover
2548313 Is available
to conceal plumbing
connections.
Airgap required.2 1/2 in.to 7/8 in.
Copper reducer is ideal.(NORTEC option
P/N 2522172) Hose mustnot
touch the bottom ofthe funnel.
Min.7/8 in.OD drain line.
Keep as shortas possible.
Slope down to floor
drain or main drain.

Installation | 10
Steam Lines and Condensate Returns
Figure 7: Main Steam Line Requirements
Table 3: Recommended Steam Line Material
Steam Line
Material
Steam Line Length
ft m Steam Line Description
Copper Tube 0-10 0-3
3/4 in MED-L Tubing (7/8 in. OD)
10+ 3+
*1 in. MED-L Tubing (1 1/8 in. OD)
Stainless Steel
Tube
0-20 0-6
1 1/2 in. MED-L Tubing (1 5/8 in. OD)
20+ 6+
*2 in. MED-L Tubing (2 1/8 in. OD)
Nortec Hose < 10 < 3 Part Number 1328810 (7/8”)
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.
Table 4: Maximum Recommended Length of Steam Line
Steam Output
(lb/hr)
Distance
(ft)
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
SteamDirection
SteamDirection
SteamDirection
2 in.
(5 cm)
1 ft (30 cm)
1ft (30 cm)
0.5 in.
(12 mm)
10 Degrees
2 Degrees
Use Appropriate Slope Insulate Pipe
1 in. (2.5 cm) pipe
insulation
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.

11 | Installation
Figure 8: RH Distributor Installation
Figure 10: Steam Distributor Above Humidifier (Hose)
Figure 11: Steam Distributor Below Humidifier (Hose)
Figure 9: ASD10 Distributor Installation
12 in.
(30 cm)
min.
4 ft (1.2 m) min. to
any obstruction
Mount ASD distributor
to side of duct
2 x duct
height min. 2/3 Duct
Height
12 in.
(30 cm)
min.
3/4 in. (19 mm)
max. wall
thickness
Mount inside if
duct wall is
> 3/4 in. (19 mm)
4 ft (1.2 m) min. to
any obstruction
Mount distributor to
side or bottom of duct
2 x duct
height min.

Installation | 12
Figure 10: Steam Distributor Above Humidifier (Hose)
Figure 11: Steam Distributor Below Humidifier (Hose)
Condensate
Trap
1 ft(30 cm)
min. Before
any bend
Min 12 in.
(30 cm)
radius Hose will soften
over time
proper support
Is necessary
SupportBrackets
1 ft (30 cm)
min.
To Drain
1 ft (30 cm)
min. before
any bend
12 in.(30 cm)
min.Radius
Condensate
Trap
Condensate
line
ConnectSteam
Hose to Cylinder
ConnectCondensate
Hose to Fill Cup
2 in.(5 cm)
min.
1 ft (30 cm)
Support
Brackets

13 | Installation
Figure 12: Steam Distributor Below Humidifier With Obstruction (Hose)
Figure 13: Common Steam Line Errors
Steam line
notsloped
No condensate
trap atvertical
transition
Condensate trap
not12 in (30 cm)
below distributor
1ft (30 cm)
min. before
any bend
12 in
.
(30 cm)
min.
radius
Obstruction
Use full size condensate tee
atlow point. Slope lines up
to “T” and immediately after it.
Hose will soften
over time
proper support
Is necessary
Supportbrackets
1 ft (30 cm)
min.
To drain
To drain
2 in.
(5 cm)
min.1 ft (30 cm)

Installation | 14
Electrical
Figure 14: Primary Power Connection
Caution: Wiring to be performed by a licensed Electrician.

15 | Installation
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
Figure 15: Control Location
1Air Proving Switch
•Locate so that it can sense air flow or lack of it.
2Duct 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.
3Humidity 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).
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.
Caution: Failure to wire the humidifier in accordance with the wiring instructions could
cause permanent damage. Such errors will void the warranty.

Installation | 16
On/Off Control Wiring
Figure 16: On/Off Controls
Figure 17: Digital On/Off Humidistat

17 | Installation
Modulating Control Wiring
Figure 18: Modulating Controls