Nortec GS Series P User Manual To The 01c11701 37f6 444a 9d01 8515a8f69ae0

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GS Series
Gas Steam Humidifier

Installation,
User & Maintenance
Guide

IMPORTANT: Read and save this guide for future reference. This
guide to be left with equipment owner.

1506222-D

FOR YOUR SAFETY:
Do not store or use gasoline or other flammable vapors and liquids in
the vicinity of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS:
Do not try to light any appliance.
Do not touch any electrical switch; do not use any telephone in your
building.
Immediately call your gas supplier from a neighbor’s telephone.
Follow the gas supplier’s instructions. If you can not reach your gas
supplier, call the fire department.
UNIT OPERATING RANGES:
Max. Ambient Temperature 104ºF (40ºC).
Min. Ambient Temperature 41ºF (5ºC).
Max. Relative Humidity (RH) non-condensing 95% RH.
Min. Relative Humidity (RH) non-condensing 5% RH.

WARNING:
Improper installation, adjustment, alteration, service or maintenance
can cause injury or property damage. Refer to this manual. For
assistance or additional information consult a qualified installer, service
agency, or the gas supplier.
WARNING:
If the information in this manual is not followed exactly, a fire or
explosion may result causing property damage, personal injury or loss
of life.
IMPORTANT:
Read and save this guide for future reference. This guide to be left with
equipment owner.

Table Of Contents
GENERAL

- WARNING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
- DELIVERY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
- RECEIVING & UNPACKING EQUIPMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
- GENERAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
- MODEL DESIGNATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

MODEL SPECIFICATION

GS INDOOR INSTALLATION

- LOCATING AND MOUNTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
- GAS PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
- COMBUSTION AIR REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
- DIRECT VENT GUIDELINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
- EXHAUST VENTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
- ADDITIONAL REQUIREMENTS WHEN VENTING THROUGH A SIDEWALL . . . . . . . . . . . . . 11
- ELECTRICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
- PRIMARY WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
- LOW VOLTAGE CONTROL WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
- CONTROL INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
- PLUMBING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
- FILL WATER SUPPLY LINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
- DRAIN LINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
- AUX DRAIN PORT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
-STEAM LINES AND CONDENSATE LINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

GS OUTDOOR INSTALLATION

- MOUNTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
-TYPICAL GSTC OUTDOOR INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
- ROOF CURB DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
- GAS PIPING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
- EXHAUST VENTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
- ELECTRICAL INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
- FILL WATER SUPPLY LINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
- DRAIN LINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
- AUXILIARY DRAIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
- STEAM LINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

PRINCIPLE OF OPERATION

- COMBUSTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
- WATER MANAGEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
- START UP PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
- FILLING THE SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
- TESTING THE IGNITION SAFETY SHUT-OFF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
- STARTING THE HUMIDIFIER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
- TAKING OUT OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
- INSTALLATION CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
- SCALE MANAGEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
- WATER QUALITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
- FAULT CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

MAINTENANCE

- DRAINING THE TANK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
- MANDATORY MAINTENANCE SCHEDULE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
- CLEANING THE TANK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
- SERVICING THE UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
- SERVICE CHECKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
- COMPONENTS REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
-Hot Surface Igniter and Flame Sensor Replacement . . . . . . . . . . . . . . . . . . . . . . . . 32
-Burner Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
-Removal and Installation of the Combustion Blower. . . . . . . . . . . . . . . . . . . . . . . . . 33
-Gas Valve Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
-Air Switch Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
-Float Chamber Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
-Transformer Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
-Fill Valve Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
-Drain Pump Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
-Fill Box Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
-Removal of the Heat Exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
- DIP SWITCH SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
- SOFTWARE FLOW CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
- FAULT AND WARNING LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
- EXPLODED VIEW INTERNAL COMPONENTS SPARE PARTS . . . . . . . . . . . . . . . . . . . . 63
- EXPLODED VIEW INDOOR CABINETRY SPARE PARTS. . . . . . . . . . . . . . . . . . . . . . . 66
- EXPLODED VIEW OUTDOOR CABINETRY SPARE PARTS . . . . . . . . . . . . . . . . . . . . . 68
- GS QUICK REFERENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

RECEIVING & UNPACKING EQUIPMENT

GENERAL
This installation guide has been designed to
provide assistance when installing, mounting, and
commissioning a GS Series humidifier. Actual on site
application may vary. Consult Technical Services or
your local NORTEC representative.

· Check packing slip to ensure ALL material has
been delivered.
· 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.

WARNING
· Improper installation, adjustment, alteration,
service, maintenance, or use can cause carbon
monoxide poisoning, an explosion, fire, electrical
shock, or other conditions which may cause
personal injury or property damage. Consult a
qualified installer, service agency, local gas
supplier, or your distributor or branch for
information or assistance. The qualified installer
or agency must use only factory authorized and
listed kits or accessories when modifying this
product. A failure to follow this warning can
cause electrical shock, fire, personal injury, or
death.

· Inspect shipping boxes for damage and note on
shipping waybill accordingly.
· After unpacking, inspect equipment for damage
and if damage is found, notify the shipper
promptly.
· All NORTEC products are shipped on an F.O.B.
factory basis. Any and all damage, breakage or
loss claims are to be made directly to the
shipping company.

GENERAL SPECIFICATIONS

· Should overheating occur, or the gas fail to shut
off, shut off the manual gas valve to the appliance
before shutting off the electrical supply.

The NORTEC GS Series humidifier is a
completely new patented design based on leading
edge technology. The GS is designed to provide clean
steam humidification at an economical price.

· Do not use this appliance if any part has been
under water. Immediately call a qualified service
technician to inspect the appliance and to replace
any part of the control system and any gas
control which has been under water.

The GS Series humidifiers are designed
exclusively for humidification in ventilation systems or
direct room humidification. Any other type of
application, without the written consent of Nortec or
your Nortec agent, is considered as not conforming
with the intended purposes. The manufacturer/
supplier can not be made liable for any damages
resulting from improper use.

DELIVERY
The standard delivery includes:
· Gas Steam humidifier equipped with desired
options.

MODEL DESIGNATION
The unit specification label indicates the model of
gas humidifier according to the following chart:

· In a bag you will find:
- Manuals.

- Adapter fittings for water connection.
PRODUCT LINE

- Steamhose for steam outlet with clamps.

(Gas Steam Humidifier)

TC = Total Controller
c/w KEYPAD
P = Economical

- Hose and clamps for drain connection.
· The GS Indoor Series offers an optional
telescopic stand mounted inside the unit legs.
Stand cross bracing are shipped with the unit.

Humidifier size (lbs/hr)

FUEL
N = NATURAL GAS
P = PROPANE GAS

· The GS Outdoor Series comes with all required
venting to be installed on site.

DIRECT VENT
OPTION

· Desired accessories ordered.

OUTDOOR MODEL

-1-

100
200
300
400
500
600

100

MODEL SPECIFICATION
MODEL GS 100 SPECIFICATIONS
FUEL

BLOWER SPEED

INPUT (BTUH)*

STEAM CAPACITY (LBS/HR)

MANIFOLD PRESS. IN W.C.

NATURAL GAS

MAX

140,000

105

-0.05

MIN

45,000

-0.05

PROPANE

MAX

140,000

105

-0.35

MIN

50,000

-0.35

MODEL GS 200 SPECIFICATIONS
FUEL

BLOWER SPEED

INPUT (BTUH)*

STEAM CAPACITY (LBS/HR)

MANIFOLD PRESS. IN W.C.

NATURAL GAS

MAX

280,000

210

-0.05

MIN

45,000

-0.05

MAX

280,000

210

-0.35

MIN

50,000

-0.35

PROPANE

MODEL GS 300 SPECIFICATIONS
FUEL

BLOWER SPEED

INPUT (BTUH)*

STEAM CAPACITY (LBS/HR)

MANIFOLD PRESS. IN W.C.

NATURAL GAS

MAX

420,000

315

-0.05

MIN

45,000

-0.05

PROPANE

MAX

420,000

315

-0.35

MIN

50,000

-0.35

MODEL GS 400 SPECIFICATIONS
FUEL

BLOWER SPEED

INPUT (BTUH)*

STEAM CAPACITY (LBS/HR)

MANIFOLD PRESS. IN W.C.

NATURAL GAS

MAX

560,000

420

-0.05

MIN

45,000

-0.05

MAX

560,000

420

-0.35

MIN

50,000

-0.35

PROPANE

MODEL GS 500 SPECIFICATIONS
FUEL

BLOWER SPEED

INPUT (BTUH)*

STEAM CAPACITY (LBS/HR)

MANIFOLD PRESS. IN W.C.

NATURAL GAS

MAX

700,000

525

-0.05

MIN

45,000

-0.05

MAX

700,000

525

-0.35

MIN

50,000

-0.35

PROPANE

MODEL GS 600 SPECIFICATIONS
FUEL

BLOWER SPEED

INPUT (BTUH)*

STEAM CAPACITY (LBS/HR)

MANIFOLD PRESS. IN W.C.

NATURAL GAS

MAX

840,000

630

-0.05

MIN

45,000

-0.05

PROPANE

MAX

840,000

630

-0.35

MIN

50,000

-0.35

-2-

HIGH ALTITUDE - A derate in input exists for installations at higher altitudes. For Canadian models, an automatic
10% derate applies to installations from 2000-4500 feet. For U.S. Models, refer to the chart below for high altitude
derate information.
FOR U.S. MODELS ONLY
Altitude
Feet

Derate %

Meters

0-2000

0-610

2001-3000

610-915

3001-4000

915-1220

4001-4500

1220-1370

4501-higher

1370-higher

Contact Factory

Figure #1
Typical Installation (Indoor)

Steamline
B or BH Venting Type
Snap on Installation
Control Wiring
Steam Outlet

Optional
Direct Vent

Gas Line
Connection
Main Power Disconnect

Shut Off

Clean Out
Access Door

Exhaust Outlet

Fresh Water
Fill Line
3/4"min 30-80 psi

Drain

Air Gap with Funnel
Optional Stand
Auxiliary Drain
Service Access Door
(Mechanical)

Service Access
Door (Electrical)

-3-

To Drain

Figure #2
Clearance Requirements
Front Clearance

Side Clearance

Minimum
4" (10.2 cm) to vent pipe
Minimum
36" (91.5 cm)

Left
36" (91.5 cm)

Front
30" (76.2 cm)

Required only for
GSTC/GSP
500/600

Right
30" (76.2 cm)

Optional Stand

· Ambient temperature location for humidifier:
41ºF - 104ºF (5ºC - 40ºC).

INDOOR INSTALLATION
The installation must conform with local building
codes or, in the absence of local codes, with the ANSI
Z223.1, National Fuel Gas Code, and/or CAN/CGA
B149 Installation Codes. Refer to the Gas Piping
section of this manual.

LOCATING AND MOUNTING
GS Series humidifiers are designed for floor
mounting or on a GS Stand (optional). The clearance
dimensions shown in this manual are for reference
only and are the minimum required for maintenance of
the humidifier. Local and National Codes should be
consulted prior to final location and installation of the
humidifier. NORTEC cannot accept responsibility for
installation code violations.
Figure #1 shows a typical installation with all
required connections to the GS Humidifier. Careful
consideration should be given to all of these
connections when choosing a location for the
humidifier.

· Relative humidity location for humidifiers:
5% rh - 80% rh.
· All GS humidifiers are rated for the clearance to
shown in Figure #2.
· Location of the steam distributor should be
minimum of 36” above the humidifier.
· DO NOT locate humidifier any further than
absolutely necessary from steam distributor
location. Net output will be reduced as a result of
heat loss through steam line. Also, increased
static pressure (over 12" W.C.) will result in hot
water going down the drain. Consult factory if this
situation occurs.
· Where possible, mount humidifier at a height
convenient for servicing.
· Make sure the humidifier is mounted level.

WARNING: During installation cover the
humidifier to prevent any dust or other
contaminants from entering the cabinets when
activities such as drilling are taking place.
-4-

· DO NOT mount humidifier on hot surfaces.
· The humidifier must be installed so that all
electrical components are protected from
exposure to water.

· DO NOT mount humidifiers in an area where
freezing may occur.

The gas inlet pipe size to the appliance is:
½” NPT for GS 100
¾” NPT for GS 200
1”
NPT for GS 300 / 400
1 ¼” NPT for GS 500 / 600

· If humidifiers are mounted on a roof, a properly
ventilated, temperature controlled, (above
freezing), weatherproof enclosure must be used.

Provide an adequate size gas supply line.
· DO NOT mount humidifiers on vibrating surface.
Consult factory.

In all installations, a certified manual shut off
valve, located outside the cabinet, must be installed.
When black iron gas pipe is used, a sediment trap
must be located ahead of the humidifier gas controls.
See Figure #3.

· The humidifier shall not be installed directly on
carpeting, tile or other combustible material other
than wood flooring.

Leak test all gas connections external to the
humidifier, using a commercial soap solution made to
detect leaks. Bubbles indicate gas leakage. Seal all
leaks before placing the humidifier in operation.

· Some insulating materials may be combustible.
Prior to installing this appliance examine the area
for insulating material. If this appliance is
installed in an insulated space, it must be kept
free and clear of insulating materials. If insulation
is added after the appliance is installed, it will be
necessary to examine the area again.

WARNING: Never use an open flame to check for
gas leaks. If a leak does exist, a fire or explosion
could occur, resulting in damage, injury or death.

GAS PIPING

The appliance must be isolated from the gas
supply piping system by closing its individual manual
shut-off valve during any pressure testing of the gas
supply piping system at test pressures equal to or
greater than 14” w.c. (3.5 kPa).

Installation of piping must be in accordance with
local codes, and ANSI Z233.1, “National Fuel Gas
Code,” in the United States or CAN/CGA-B149
Installation Codes in Canada.

Dissipate test pressure from the gas supply line
before re-opening the manual shut off valve to the
appliance.

The following table indicates the maximum and
minimum allowable gas pressures for the Gas
Humidifier.

NOTES: (See pg 19 for additional Gas Piping
information)

INCHES W.C.
GAS

MIN.

MAX.

Natural

4.5

9.0

Propane

9.0

13.0

· Failure to follow this procedure may damage the
gas valve. Over pressured gas valves are not
covered by warranty.
· DO NOT use Teflon tape on gas line pipe
threads. A flexible sealant suitable for use with
Natural Gas and Propane Gas is recommended.

Figure #3
Gas Connection

· Plan gas supply piping so it will not interfere with
removal of gas valves or blower assemblies and
front or side service doors.

Inlet coupling supplied
Shut-off Gas Valve
(by others)

· All gas piping should be adequately supported to
prevent any strain on inlet piping.
The gas valve is provided with pressure taps to
measure gas pressure upstream and downstream,
(manifold pressure). The minimum gas pressure
shown is for the purpose of input adjustment.

Union
(by others)

Sediment Trap
(by others)

A 1/8" NPT plugged tapping, accessible for test
gage connection, must be installed immediately

-5-

recommended that the supply air line is insulated and
an in line heat is added. Consult factory.

upstream of the gas supply connection to the
appliance.

Attach the air supply line to the manifold using a
hose clamp or hose coupling if required. See Figure
#4.

COMBUSTION AIR REQUIREMENTS
Provide for adequate combustion and ventilation
air in accordance with Sections 8.3, Air for Combustion
and Ventilation, of the National Fuel Gas Code, ANSI
Z223.1, or Sections 7.2, 7.3, 7.4 of CAN/CGA B149
Installation Codes, or applicable provisions of the local
building codes.

WARNING: Air supply line should not obstruct
any services going to the humidifier front and
right side cabinet panels.
WARNING: BH Type venting must be used in
a direct vent application.

The required free area of supply air opening is:
13 in. sq. (8,387 mm2), for GS 100
23 in. sq. (14,839 mm2), for GS 200
35 in. Sq. (22,581 mm2), for GS 300
47 in. Sq. (30,323 mm2), for GS 400
59 in. Sq. (38,064 mm2), for GS 500
71 in. Sq. ( 45,806 mm2), for GS 600

The air intake terminal and the flue gas terminal
must end at an outside location. See Figure #5.

Cabinet top and bottom contain air openings to
provide combustion air to the forced draft blower. DO
NOT BLOCK THESE OPENINGS.

Air Piping Insulated
(by others)

Excessive exposure to contaminated combustion
air will result in safety and performance related
problems. Known contaminates include halogens,
ammonia, and chlorides, excessive dust, lime or dirt.
Excessive exposure of electronics to the contaminants
will also result in performance related problems.
Contact NORTEC Technical Services if you have any
questions. If contaminants exist, isolate the unit from
the contaminated space.

Hose Coupling
(by others)

Air Intake Connection

DIRECT VENT GUIDELINES
Installation of the combustion air supply line must
be carried out by adequately qualified personnel. All
local regulations relating to the provision of air supply
systems must be observed and adhered to.

Figure #5
Direct Vent Side Wall Requirements

The maximum pipe length for the air supply line
and exhaust is equivalent to 70’ (21m). The vent pipe
diameter must be maintained over the overall length of
the vent.

Exhaust terminal with
opening vertical.

All air piping must be listed type for direct vent
application with sealed joints and seams, such as Z
flex.

Intake terminal with
opening vertical.

The air supply line should be approximately as
long as the flue gas venting and must be supported at
every 5 ft. (1.5 m) and additionally at every pipe bend.
4 ft - 6 ft
(1.2 m - 1.83 m)

The air supply line must be installed with air
supply terminals provided.

Keep 6“ (15.2 cm)
away from sidewall.

At low temperatures, water condensation can form
on the outside of the pipe. To prevent this, it is
-6-

· In applying the codes, reference should be given
to the venting manufactures instructions, the
serving gas supplier regulations, and the specific
instructions provided in this manual.

Location of air intake and flue gas terminal must
comply with all local and national regulations.

EXHAUST VENTING
The GSTC and GSP are classed category I and III
fan assisted gas appliances. This allows two methods
of venting. Listed below are instructions for both
venting systems, followed by specific requirements for
each system.

· This appliance must be installed to comply with
national regulations and codes. A qualified
technician, competent with these codes and the
local requirements of the jurisdiction must carry
out the installation.

Review the requirements for both category I and III
installations and select the venting method best suited
for the installation.

· Proper removal of combustion gases must be
assured, and building materials must be
protected from degradation by flue gases.
· Never mix venting types. (B to BH or visa versa.)
Never use two different manufacturer’s
equipment for the same chimney.

Category III class must be used in direct vent
applications.
GENERAL REQUIREMENTS

· All vent runs should be as direct as possible with
no more than 6 elbows in the system.

· The vent systems shall be listed to UL or UL/CSA
standard and meet the installation requirements
of the National Fuel code in the USA ( ANSI
Z223.1) and the Canadian Standards
CAN/CGA.B149 Installation Codes. Any local
jurisdictions reflecting changes to the above
codes should be observed.

· Maintain an upward slope of ¼” per ft on all
horizontal vent pipe runs.
· This gas humidifier may not be used in
conjunction with a power venter or draft inducer.

Figure #6
Horizontal Venting Using a Direct Vent Application Using BH Type Only
Wall
Hangers straps

BH type vent using double wall vent
with all joints being air and water tight.
Reference local and/or national codes
before installation of the vent

Condensate
Tee

Condensate tee and trap must
be installed. Take the condensate
to a floor drain or a condensate pump

Trap

2 ft Min
3” Min

Exhaust venting must
be min.4 ft, max.6 ft
in distance apart from
the fresh air intake
for direct venting

Terminations
supplied with
unit

Exhaust venting outlet
Steam
Outlet

Direct vent
Inlet

BH type double wall with double
wall connectors required.

Note: These are guidelines only. Follow the local and/or national codes in your respective area.

-7-

Figure #7
Vertical Venting Application Using B or BH Venting
UL Listed Cap
Required

Flashing
B or BH type vent using double wall vent
with double wall connectors is required.
Reference local and/or national codes
before installation of the vent.
4" minimum air
space required

Horizontal run
1/4"rise per ft

Exhaust venting
outlet

Steam Outlet

Condensate tee
required
Trap
2 FT Min
3” Min.

Condensate tee and
trap must be installed.
Take the condensate to
a floor drain or a
condensate pump.

B type double wall vent with
double wall connectors required
for category I appliances.
Limitations on horizontal
distance when venting with B
vent
BH type double wall vent with
double wall connectors required
and all joints are to be air and
water tight. BH vent is a category
III appliances

Figure # 8
Side Wall Venting Application Using BH Type Only

Wall
Hangers Straps

BH type vent using double wall vent
with all joints being air and water tight.
Reference local and/ or national
codes before installing vent

Exhaust venting outlet

Nortec vent terminal

Condensate
Tee

2 ft Min.

Trap

3” Min.

Steam Outlet
Condensate tee and trap
must be installed. Take
the condensate to a floor
drain or a condensate
pump.

BH type double wall vent with double wall
connectors is required for category III appliances

Note: These are guidelines only, follow the local and/or national codes in your respective area.

-8-

Figure # 9
Co-venting Application Using B Vent Only

UL Listed Cap
Required

B type double wall vent
with double wall
connectors is required for
category I, serving two or
more gas appliances.
Condensate tee and trap
must be installed. Take
the condensate to a floor
drain or a condensate pump.

Exhaust venting
outlet

Condensate
Tee
Steam Outlet
Trap

Category I gas appliance uses
B type venting. Follow local
and/or national codes for
venting installation.
Note: These are guidelines only. Follow local and/ or national codes in your respective area.

Install a trap with a minimum 12” standing
water column.

· For any vent lengths over 20 feet long, insulate
the vent pipe to reduce the amount of condensate
that could form in the flue gases.

· Prior to activating the appliance, ensure that the
trap is filled with water and that the drain
terminates in accordance with local plumbing
codes.

· When the venting passes through a cold area, or
location that has large amounts of air passing
over the venting, it should be insulated to prevent
condensation from forming inside the venting.

· Never vent into a unlined masonry or concrete
chimney.

· Vent pipe passing through walls, floors, and
ceilings, must be installed with the proper
clearances from combustible materials, and
venting manufactures fire stop equipment.

· Chimney or vent should extend at least 3’ (1 m)
above a roof and at least 2’ (.6 m) above any
ridge within 10’ (3 m) of the chimney. Local codes
apply.

· The venting shall not pass through any circulation
air duct or plenum.

· Install venting so as to prevent accumulation of
condensate and have a means for condensate
removal.

WARNING: Provide a screen or barrier to prevent
personal injury in areas where personnel may come
into contact with hot vent pipes.

· Plastic, PVC, CPVC and HTPV special gas vents
are not approved for use with this appliance.

· A drip “T” or flue box condensate port should be
used for condensate removal. When a
condensate drain is used it will be necessary to
install a trap to prevent flue gases from escaping.

· The vent must terminate at a sufficient height
above the roof to prevent blockage by expected
snowfall.
-9 -

· Vent connectors shall not be connected into any
portion of a mechanical draft system operating
under positive pressure.

· Vent pipe must be secured with hangers or pipe
straps
· All horizontal runs must be adequately supported
with hangers or straps to prevent sagging.

· The GS series humidifiers have a fan-assisted
combustion which operates with a non-positive
vent static pressure when installed with the
appropriate vent diameter.

· Use only double wall (aluminum inner wall) B
vent. Single wall venting can not be used due to
the increased wet time in the lining. If the vent
connector attaches to a lined masonry chimney,
the chimney must be sized and installed
according to the provisions of the National Fuel
Gas Code or Canadian CAN/CGA.B149
standards.

· Category I appliances must be vented vertically
or nearly vertical. (See Figure #7 & #9)

· An approved venting manufacturers termination
cap for the stack outlet must be used.

· This category appliance is restricted to vertical
venting installations with limits placed on
horizontal lengths and vent diameters. Refer to
the tables in local and/or national codes. No
sidewall termination is accepted.

· The maximum flue temperature is 400 degrees F.
Normal operating range is 360 to 380 degrees F.

Installation as a Category I Appliance

· When the category I installation is selected it may
be commonly vented with other listed gas fire
appliances. Total input rates of all appliances will
determine the vent size the chimney must be
sized and installed according to the provisions of
the National Fuel Gas Code or Canadian
CAN/CGA.B149 standards.

· Vent piping must be UL or UL/CSA listed type B
or B-W.

Recommended B-Venting Manufacturers

· A maximum of 4 gas appliances may be common
vented on the same floor. Multiple story common
venting is not recommended.

1. Simpson Dura-Vent

2. Selkirk Canada Corporation

· Refer to the vent manufacturers instructions for
proper clearances to combustibles.

3. American Metal Products
Figure #10
Exhaust Connection

4. Metal-Fab Inc.
· The vent pipe exiting the humidifier is sized for
Category III installations. A field supplied adapter
is required to increase the pipe immediately at
the exit of the humidifier. The vent pipe must be
expanded to the minimum sizes listed below for
each model, increasing as code requires.
GS 100
GS 200
GS 300/400
GS 500/600

4” minimum diameter
5”
7”
8”

Female to Female
Adapter
(by others)

· The termination at the humidifier is a MALE
connection. Standard venting hook-ups require a
female path. It is highly recommended that a
female to female adapter be assembled onto the
humidifier to establish the proper venting
sequence. Consult with the venting manufacturer
for proper hook up.
- 10 -

· This appliance should not be connected to a
chimney flue servicing a separate appliance
designed to burn solid fuel. Never connect this
humidifier to a chimney servicing a fireplace.

WARNING: Provide a screen or barrier to prevent
personal injury in areas where inadvertent personnel
contact with vent pipe can occur.
· A minimum equivalent vent length of 7 feet must
be connected to the humidifier. Vent lengths
must not exceed 100’ (30 m). Each 90° elbow
is equivalent to 10’ and each 45° elbow equals 5'.
The vent run should be as direct as possible with
no more than 6 elbows in the system.

· This venting category cannot be used in direct
vent applications.
Installation as a Category III Appliance
· This venting system can be installed horizontally
or vertically and can terminate on a rooftop or
sidewall provided the NFGC (Nation Fuel Gas
Code) and CAN/CGA- B149 codes are followed.
The venting manufacturer instructions must also
be followed. See Figure # 6,#7 & #8.

ADDITIONAL REQUIREMENTS WHEN VENTING
THROUGH A SIDEWALL

· This venting must be used in all direct vent
applications.

For sidewall venting, locate the humidifier as close
as possible to the wall being used.

· This category installation may not be common
vented with any other natural draft gas appliance
or power assist appliance. The humidifier cannot
share a chimney flue servicing an appliance
designed to burn solid fuel.

Locate the vent terminal at least three feet above
any forced air inlet located within ten feet; or at least
four feet below, four feet horizontally from, or one foot
above any door, window, or gravity air inlet into any
building.

· Venting must be UL or UL/CSA listed, tested to
ULC-5636 Standard. Venting may be BH or L
vent. Special gas vent shall be listed and installed
in accordance with the terms of the special gas
vent listing and the manufacture’s instructions.
The special instructions listed below should be
followed as well.

A minimum horizontal clearance of four feet from
electric meters, gas meters, regulator and relief
equipment is required.

· Diret vent applications, length of vent should not
exceed 70” in equivalent length.

For sidewall vent terminations, the humidifier must
be installed with the certified vent terminal that can be
purchased from Nortec.

· All joints must be sealed using high temperature
RTV silicone.

BH Vent Manufacturers
1. Flex-L International

GS 100

3”

Nortec P/N 1502321

GS 200

4”

Nortec P/N 1502322

GS 300/400

5”

Nortec P/N 1507320

GS 500/600

6”

Nortec P/N 1507321

Locate the vent terminal at least seven feet above
grade when it is adjacent to public walkways.

2. Fas-N Seal
3. Heat-Fab Inc.

Locate the bottom of the vent terminal at least
twelve inches above grade or ground, or normally
expected snow accumulation level. The snow level
may be higher on walls exposed to prevailing winds.

4. Z Flex
· The gas humidifier is supplied with the following
exhaust outlets.
GS 100
GS 200
GS 300/400
GS 500/600
·

Avoid areas where local experience indicates that
condensate drip may cause problems such as above
planters, patios, or over public walkways, or over an
area where condensate or vapor could create a
nuisance or hazard, or could be detrimental to the
operation of regulators, relief valves, or other
equipment. Refer to the vent manufacturer's
installation instructions.

3”
4”
5”
6”

The venting must remain the same diameter
throughout the installation.

- 11 -

Field wiring from humidistat to humidifier and
between devices should be shielded 18 AWG or
heavier and kept as short as possible.

The vent terminal must be installed in the same
atmospheric pressure zone as the combustion air inlet
of the humidifier. If this is not possible (as in cases of
positive or negative room pressures) the humidifier
should be installed with the direct vent option.

Controls are available from NORTEC as
accessories and can be ordered with the humidifier.
Controls by others may also be used as long as they
meet the criteria noted below. The following is a
summary of the common types of controls that may be
used with NORTEC Gas Humidifiers.

ELECTRICAL
PRIMARY WIRING
All work concerning the electrical installation
must be performed by qualified personnel.

Wall or Duct Mounted Control On/Off
Humidistat: Wired to make on drop in humidity,
break on rise to setpoint. Set to desired RH. Can
be a make/break set of contacts from a Building
Automation System.

WARNING: The electrical parts inside the
humidifier are very sensitive to electrostatic discharge.
Appropriate measures against electrostatic discharge
(ESD protection) must be taken when carrying out
installation work.

Duct Mounted Safety High Limit On/Off
Humidistat: Wired to make on drop in humidity,
break on rise to safety setpoint. Set to
approximately 85% RH as a safety to prevent
saturation and wetting in the duct. Highly
recommended for ducted applications.

· The humidifier should only be connected to
primary power (mains power) after all installation
work has been completed.
· An external disconnect switch must be installed
close to the unit to allow for power interruption
during servicing and/or maintenance.

Duct Mounted Safety Air Proving On/Off Switch:
Wired to make when sensing air flow, break when no
air flow. Used as a safety to prevent saturation when
there is no air flow. Highly recommended for ducted
applications.

· Humidifiers require field wiring to primary voltage
terminal blocks. Power requirement must be
120V or 208-240 Vac, 15A separately fused
circuit, single phase. Use only copper wire with a
minimum 70 °C (158 °F) temperature rating.
Wiring can be fed through a 7/8" hole on the
bottom or the top of the control compartment.
See Figure #1.

Wall or Duct Mounted Modulating Humidistat:
Provides a modulating signal to the unit that
represents the output (up to 100%) required from the
humidifier. Signal type can be changed in the field via
dip switch settings on the logic control board.
All GS models may be configured for either single
or dual channel modulation. Control signals can be
0-10 VDC or 0-20 mA (0-5 VDC, 1-5 VDC, 4-20 mA
and 2-10 VDC are also available). The unit must be
ordered from the factory for the desired signal type
and number of channels. When configured for
2-channel modulation the humidifier will generate
steam only if both channels indicate a demand. If both
channels are demanding steam the humidifier will
satisfy the lower demand signal.

· When installed, the appliance must be electrically
grounded in accordance with local codes or, in
the absence of local codes, with the National
Electrical Code, ANSI/NFPA 70, and/or the CSA
C22.1 Electrical Code, if an external electrical
source is utilized.
· External wiring sizes must be in accordance with
NEC and/or CEC and existing local electrical
codes and by-laws.
LOW VOLTAGE CONTROL WIRING
All GS models require at least one type of input
control signal for unit operation. Refer to the sections
below that detail the types of controls that can be used
with each model.
Low voltage control terminal strips are provided in
the electrical compartment. Internal sides are factory
wired. External sides are to be field wired. Refer to
the specific control-wiring diagram supplied with each
unit.
- 12 -

VOLTAGE

PRIMARY 208-240V 1 phase line voltage wiring to unit
(BY OTHERS)

(ACTUAL)

Ground Wire

Ground
Leg

Ground

600V/3ph

Step down
Transformer
600V/208V
by others

L2
L3

Dedicated
Circuit
Breaker
Or
Disconnect

Note:
- 600V/3 Phase Supply.
- 600V/1ph between any two hot leg.
- 347V/1ph between hot and neutral.

Neutral

2 Pole
Terminal
Block

E
X
T

I
N
T

Ground Wire

460V/3ph

Ground
Leg

Ground

Step down
Transformer
460V/208V
by others

L2
L3

Dedicated
Circuit
Breaker
Or
Disconnect

Note:
- 460V/3 Phase Supply.
- 460V/1ph between any two hot leg.
- 277V/1ph between hot and neutral.

Neutral

2 Pole
Terminal
Block

E
X
T

I
N
T

Ground Wire

Ground
Leg

Ground
L1

380V/3ph

Dedicated
Circuit
Breaker
Or
Disconnect

L2
L3

Note:
- 380V/3 Phase Supply.
- 380V/1 phase between two hot legs.
- 220V/1 phase between hot and neutral.

Neutral

2 Pole
Terminal
Block

E
X
T

I
N
T

Ground Wire

Ground
Leg

Ground
L1

208V/3ph

Dedicated
Circuit
Breaker
Or
Disconnect

L2
L3

Note:
- 208V/3 Phase Supply.
- 208V/1 phase between two hot legs.
- 120V/1 phase between hot and neutral.

Neutral

120V/1ph
120V/1ph

3 Pole
Terminal
Block

E
X
T

I
N
T

Ground Wire

Ground
Leg

Ground
L1
Dedicated
Circuit
Breaker
Or
Disconnect

L2
Neutral

Note:
- 120V/ 1 phase Supply.
- 120V/1phase between hot and neutral.
- 240V/1phase between two 120V/1ph supply.

3 Pole
Terminal
Block

E
X
T

I
N
T

Ground Wire

Ground
Leg

Ground

120V/1ph

L1
Neutral

Step up
Transformer
120V/240V
min. 2kVa
by others

Dedicated
Circuit
Breaker
Or
Disconnect

Note:
- 120V/ 1 phase Supply.
- 120V/1phase between hot and neutral.
- 240V/1phase between two 120V/1ph supply.

3 Pole
Terminal
Block

E
X
T

I
N
T

NOTE: VoltageAt Terminal Block Must Be InAccordance With Spec. Label.
All Wiring To Be InAccordance With Existing NationalAnd Local Electrical Codes.

- 13 -

GS SERIES
EXTERNAL CONTROLS WIRING CONNECTIONS
LOW VOLTAGE TERMINAL STRIP
NOTE: This is a generic wiring diagram only. For specific wiring instructions, it is necessary to refer
to the wiring diagram which is supplied with each unit.

EXTERNAL
INTERNAL

N.C.

COM

N.O.

Humidifier “FAULT”

Humidifier “SERVICE”
N.O.

COM

Humidifier “ACTIVE”
N.O.

COM

N.O.

COM

Humidifier “ON”

Safety Interrupt (24 Vac)

Full Tank Blow Down (FTBD)
enable (24 Vac)

10 Vdc output

Modulation Input Signal “B”

Security Loop

Modulation Input Signal “A"

WA R N I N G : F a i l u r e t o w i r e t h e c o n t r o l l e r i n a c c o r d a n c e w i t h t h e w i r i n g d i a g r a m t h a t w a s s u p p l i e d
w i t h t h e u n i t c o u l d p e r m a n e n t l y d a m a g e t h e G S T C / G S P b o a r d . S u c h e r r o r s w i l l v o i d t h e u n i t w a r r a n t y.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
+

EXTERNAL
INTERNAL

NOTE: If no On/Off Control is used then a field jumper
must be connected across terminals 1 and 2 in order
for the humidifier to operate.

Low Voltage Terminal Strip
1 & 2: Wire all on/off controls and safeties between these two terminals. If not used, jumper 1 & 2 for the
unit to operate.
4: Modulating input to humidifier “A”.
5: Modulating input to humidifier “B”.
6: 10 Vdc output.
8: When 24 Vac input received, the unit will initialize a full tank blowdown.
9: Safety interrupt (24 Vac).
10 & 11: Remote indication connection for humidifier “on” status indication.
12 & 13: Remote indication connection for humidifier “active” status.
14 & 15: Remote indication connection for service required indication.
16 & 17 & 18: Remote indication connection for fault indication.

- 14 -

· It is recommended to have a faucet installed
close to the humidifier to allow quick filling of the
system on initial start up. This can also be very
useful for mandatory cleaning of the unit.

CONTROL INSTALLATION
· Mount any wall humidistat (control or high limit)
over standard electrical box at height similar to
typical thermostat. Any wall humidistat should be
in location representative of overall space being
humidified and not in path of blower pack or air
supply grille. Do not mount on an outside wall
where temperature fluctuations can affect control
response.

· ALWAYS supply and install a shut off valve and
union in the water supply line dedicated to the
humidifier to facilitate servicing.
· If water hammer occurs, install a shock arrester
on the fill water line just before the inlet to the fill
valve. Water hammer will damage the fill valve.

· Mount duct humidistat in location representative
of overall air humidity, usually in return duct. Do
not mount it directly in front of steam distributor or
in turbulent or mixing zone. Mount humidistat
where air's humidity and temperature are uniform
and representative of spaces being humidified.

· A 1” air gap is designed into the fill system of the
GS humidifier. Some local plumbing codes may
still require the installation of a double check
valve on the fill line to the humidifier to prevent
contamination of the supply water system. Verify
with local codes and install if necessary.

· Mount duct high limit humidistat downstream of
steam distributors far enough that, under normal
humidity and air flow conditions, steam will have
been fully absorbed (typically at least 10 feet). It
must be located to sense high humidity only
when uniform and representative air is
over-humidified or approaching saturation.

Figure # 11
Plumbing Connections
1/2” NPT Water Supply
(by Nortec)
Union
(by others)

· Mount duct air-proving switch so that it is able to
sense air flow or lack of it. Wire it to make when
air flow is sensed and break when air flow fails.

Check Valve
(by others,
if required)

Manual Shut-off
(by others)

· Check operation of all on/off controls before
starting humidifier.
3/4” O.D.
Drain
(Hose clamp by Nortec)

· Calibration of controls (on/off or modulation) in
the field may be necessary due to shipping and
handling. Verify humidistat accuracy before
commissioning system.

Manual
Shut-off
(by others)
Union
(by others)

PLUMBING

Funnel with
Air Gap (by others)

NOTE: All water supply and drain line
connections should be installed in accordance with
local plumbing codes.

1/2” NPT Female
Auxiliary Drain

FILL WATER SUPPLY LINE
· Each unit is supplied with an adapter for the fill
valve (½”NPT ). Fill rate 10 l/min all unit sizes.
Size of piping is a minimum ½” copper,
recommend ¾” up to within 4 feet of unit.

DRAIN LINE
· The humidifier is equipped with a ¾”O.D.
Unthread ed drain outlet connection on the side
of the humidifier. A vacuum break valve is
installed internal to the unit on the drain line. The
drain water line must be piped to a drain funnel to
provide an air gap before connection to the
building drainage system.

· Standard fill valves are sized for water pressure
ranging from 30 to 80 psig (ideally 55 to 60 psig).
For other pressures, consult factory. This
pressure should be measured at the humidifier if
the water pressure is suspect.

- 15 -

· 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. Internal drain water
tempering will ensure a maximum of 140ºF
(60ºC) exiting water temperature.

Figure #12
Steam Line Connection

Steam Line

· Never install PVC piping as a drain line material.
Always use material suitable for with-standing
140ºF (60ºC).

Snap on Insulation

· Keep drain lines as short as possible. Keep drain
lines sloped down, not level and not up since low
spots in drain lines will accumulate sediment and
cause backup. The drain line should be 1-1.5"
O.D. or larger. Consult local codes.
Hose cuffs &
clamps supplied

· When the drain pump is activated, the tank drains
at a rate of 7-8 gal/min (18-20 l/min).
AUX DRAIN PORT

GS Outdoor Installation

· An auxiliary drain port is also provided on the
side of the humidifier. It can be used to manually
drain the unit, if required. The unit is shipped
with this connection plugged. It is recommended
to install a shut off valve on this line (see Figure
#11).

GS Outdoor units are CSA certified for outdoor
installation and come complete with exhaust venting
and internal ventilation (cooling) for the electronics.
Heaters for freeze protection are standard with outdoor
units.

· The auxiliary drain port is used with the standard
freeze protection. Install a shut off valve on this
line and pipe to the drain funnel (see Figure #11).
The manual shut off valve must always be in the
open position when the unit is operating but can
be closed for servicing of the unit.

All installations must conform with local building
codes or, in the absence of local codes, with the
National Fuel Gas Code ANSI Z223.1 in the United
States or CAN/CGA B149 Installation codes in
Canada. NORTEC can not accept responsibility for
installation code violations.

STEAM LINES AND CONDENSATE LINE

MOUNTING

· Steam hoses and clamps are provided with the
GS humidifier for connection to the steam lines.
Refer to Figure #12 for connection details.

· Typical rooftop installations are shown in Figure
#13 & #14.
· The GS Outdoor unit comes standard with
cutouts in the base to allow for lifting by a forklift.
When lifting by this method, ensure that the forks
extend across the entire base to prevent tipping
or damage to the unit.

· For steam line installation between the humidifier
and distribution system, consult the distribution
system installation manual. Steam Distributor
Installation Manual - Form #XX-231 and SAM-e
Short Absorption Manifold - Form #XX-249.

· The enclosure also comes complete with four (4)
removable lifting lugs fastened to the base. All
four lugs must be utilized if moving the unit in this
manner. Protect the cabinet from damage from
the lifting cables/chains during lifting. The lifting
lugs should be removed from the base once the
unit has been correctly positioned on the curb
mounting.

· The GS series of Gas-Steam humidifiers can
develop steam pressures up to 12”w.c. to
overcome duct and steam line pressures. An
enclosed trap on the drain line prevents steam
from going to drain. Duct pressures above 12”
will cause steam to exits through the drain line.
Consult factory.

- 16 -

See Figure #15 for clearance details.

Figure # 13
GSTC Outdoor Typical Installation Rooftop

BH Vent
(By Nortec)

AHU

Insulated
Steam Line
(By others)
Electrical
Disconnect
(By others)
Roof Curb
(By others)

Gas Line with
Manual Shut-off
(By others)

Water
Supply

Drain
Lines
Funnel
With Air Gap

Manual
Shut-off

Figure # 14
GS Outdoor Typical Installation Rooftop

BH Vent
(By Nortec)

Insulated
Steam Line
(By others)

Electrical
Disconnect
(By others)
Roof Curb
(By others)

Gas Line with
Manual
Shut-off

- 17 -

Figure # 15
GSTC Outdoor Clearance
Minim um Re quire d Cle a ra nce s
GSTC
GSTC
GSTC
GSTC
GSTC
GSTC

Mode l
Outdoor
Outdoor
Outdoor
Outdoor
Outdoor
Outdoor

100
200
300
400
500
600

Front
30" (76cm)
30" (76cm)
30" (76cm)
30" (76cm)
30" (76cm)
30" (76cm)

Le ft
0
0
30" (76cm)
30" (76cm)
30" (76cm)
30" (76cm)

40"
40"
40"
40"
40"
40"

Right
(101.6
(101.6
(101.6
(101.6
(101.6
(101.6

cm)
cm)
cm)
cm)
cm)
cm)

6"
6"
6"
6"
6"
6"

Ba ck
(15.25 cm)
(15.25 cm)
(15.25 cm)
(15.25 cm)
(15.25 cm)
(15.25 cm)

TOP

Left

FRONT

RIGHT

Figure # 16
Roof Curb Dimensions
Roof Curb Dimensions
GSTC
GSTC
GSTC
GSTC
GSTC
GSTC

Mode l
Outdoor
Outdoor
Outdoor
Outdoor
Outdoor
Outdoor

100
200
300
400
500
600

Dim e nsion A
8.63" (27.91cm)
15.06" (38.25cm)
30.63" (77.8cm)
30.63" (77.8cm)
46.25" (117.5cm)
46.25" (117.5cm)

Curb He ight
15" (38.1cm) Min.
15" (38.1cm) Min.
15" (38.1cm) Min.
15" (38.1cm) Min.
15" (38.1cm) Min.
15" (38.1cm) Min.

Shipping W e ight
400 lbs (181 kg)
500 lbs (227 kg)
700 lbs (318 kg)
745 lbs (339 kg)
800 lbs (363 kg)
844 lbs (384 kg)

Ope ra ting W e ight
556 lbs (252 kg)
744 lbs (338 kg)
1185 lbs (539 kg)
1210 lbs (550 kg)
1505 lbs (684 kg)
1525 lbs (693 kg)

Roof Curb
by Others
A

Pipe
Chase
A
Lifting
Hooks
SECTION A-A

11/16”
(1.8cm)

34 1/8”
(86.6cm)

3 3/4” MAX.
(9.5cm)

ELECTRICAL SIDE
3/4”
(1.90cm)

BURNER SIDE

ROOF
PIPE CHASE

BASE FRAME
ELEMENT
CURB

5.0”
(12.7cm)

6.0”
(15.24cm)

- 18 -

· The integral base of the GS Outdoor model is
designed to mount on a curb. The curb must be
built to structurally support the entire weight of
the humidifier when in operation. Required curb
dimensions are given in Figure #16 .

· Gas lines are to be routed to the outside
connection on the right side near the back of the
unit. The installation of a sediment trap and a
certified manual shut-off valve are required
outside of the unit. The gas piping must not block
access to or prevent opening of the right side
service door. Refer to Figure #17 for details.

· Ensure that the humidifier is mounted level.

· Nortec recommends that each Gas Fired
Humidifier has it’s own regulator installed in line to
the unit. Th operating Natural Gas pressure
supplied for the GS units must be in the range of
5-9 “ of Water Column and propane version
10-14” of Water Column.

· The pan in the bottom of all outdoor models has
a pipe chase for routing of services into the
humidifier from below.
· It is not necessary to make the hole in the roof
the same size as the curb. The curb drawing
shows the location and size of the pipe chase
required. The pipe chase should be sealed when
the installation is complete to ensure positive or
negative pressure from the building.

· Over pressure protection devices shall be
provided to prevent the pressure in the piping
system from exceeding that value that would
cause unsafe operation of any connected and
properly adjusted Gas utilization equipment. See
Figure #18

· The panels of the outdoor model have louvers to
provide ventilation for the electronics and air for
the combustion process. Locate the unit so that
louvered panels are a minimum of 10 ft from any
mechanical exhaust outlet.

· If the system has a pressure that is higher than
the max working pressure of our humidifier, then
an Over pressure protection system is required. If
there is an Over pressure protection device
installed, it MUST consist of 2 devices in series.
(A pressure regulator plus one other device) Both
these devices must be able to work on their own
without damaging any downstream piping or
appliance, and the only way the downstream

· When mounted on the curb, the lowest air intake
louvers must be a minimum of 12” above any
surface where snow or ice could accumulate. In
areas where normal snow accumulation is
higher, mount the unit accordingly.
· Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of the humidifier.

Figure #17
Gas Piping

· The humidifier may be installed directly on
combustible flooring or, in the U.S., on wood
flooring or Class A, Class B or Class C roof
covering materials.

Inlet coupling supplied

GAS PIPING
Shut-off Gas Valve
(by others)

· Installation of piping must be in accordance with
local codes, and the National Fuel Gas Code
ANSI Z223.1 in the United States or
CAN/CGA-B149 Installation Codes in Canada.
· Refer to the indoor gas piping installation
guidelines for gas line sizes, pressures, leak
testing procedures, and safety instructions.

Union
(by others)
Sediment Trap
(by others)

- 19 -

Figure #18
GasPiping

· Each vent length and the rain cap have a built-in
mechanical locking band and gasket. Simply
push together each component to the stop bead,
which provides an air & water-tight seal. Then
tighten the integrated locking band on each
component to complete the installation of the
exhaust venting.
· The rain cap must extend at least 2 feet above
any ridge within 10 feet of the unit. The exhaust
venting can be extended using additional vent
lengths purchased from Nortec.
ELECTRICAL INSTALLATION
· Power and control wiring is to be routed into the
humidifier through the pipe chase in the base pan
of the outdoor models located in the burner area.
· Installation details for primary and low voltage
control wiring are the same as for indoor units.

system can be damaged is by the failure of both
devices.

· A field supplied NEMA rated weatherproof
disconnect switch must be mounted external to
the GS Outdoor unit to allow for power
interruption during servicing and/or maintenance.
A mounting plate, located on the front of each
outdoor model above the electrical access door,
is available for mounting of the disconnect switch.
Two electrical conduits are provided for routing
the primary wiring to the disconnect switch and
then back inside the enclosure to the main power
terminal strip. See Figure #20 for details.

EXHAUST VENTING - OUTDOOR UNITS
· All required exhaust venting is provided with each
GS Outdoor model, by Nortec, including rain cap
and storm collar. All venting components
external to the unit are shipped with the unit and
must be installed on site. Refer to Figure #19 for
venting components.

Figure #19
Exhaust - Outdoor Units

Figure #20
Electrical Box

Rain Cap

Disconnect box
(By others)

All Venting provided
by Nortec

Extension Pipe

Storm Collar

Primary wiring
(By others)

- 20 -

Figure #22
Drain Connection

FILL WATER SUPPLY LINE
· Each unit is supplied with a ½” NPT male
connection to the fill valve. Refer to Figure #21
for connection details. A minimum fill rate of 10
l/min (2.6 gal/min) is required for all unit sizes.
Allowable pressure range is 30-80 psig.
· Always install a manual shut off within the
building to allow isolation of the water to the unit.
A union must be installed on the fill line prior to
the fill valve to allow for servicing.
· Heat trace fill line piping above rooftop from the
pipe chase up to the fill valve.

Figure #21
Fill Water Connection
1/2” NPT
Connection

AUXILIARY DRAIN
· Standard GS Outdoor units come with a capped
¾”NPT auxiliary drain connection at the bottom of
the tank. It is recommended to install a manual
shut-off valve on this connection and route to
drain (provide an air gap).

Check Valve
(If required)
Drain Line
Connection

· GS Outdoor units standard with freeze protection
have a normally open drain valve mounted at the
auxiliary drain connection and piping that
terminates at the pipe chase in the base pan.
This valve opens and will drain the contents of
the tank in the event of a power failure. See
Figure #22. Install a manual shut off valve on this
line and pipe to the drain funnel. This valve must
always be left in the open position when in
operation but can be closed for servicing of the
unit.

Manual
Shut-Off
Valve
(By others)

Pipe Chase

DRAIN LINE
· GS Outdoor units have an integrated 12”w.c. trap
and vacuum break valve on the drain line. A
drain hose, connected to the outlet of the internal
trap, terminates at the pipe chase in the burner
section.

· Drain pipe should be capable of withstanding
200°F temperatures.

· Route the drain hose to a drain funnel in the
building to provide an air gap before entering
main building drain/sewage system.
· When the drain pump is activated, the tank drains
at a rate of 18-20 l/min (7-8 gal/min).
· Internal drain water tempering will ensure a
maximum of 140°F (60°C) during normal
operation.

- 21 -

STEAM LINES

PRINCIPLES OF OPERATION

· The steam outlet connection is located at the
back of the GS Outdoor unit. Steam hose(s) and
clamps are supplied with the unit and are
intended to provide a flexible coupling outside of
the unit to the building steam lines. See Figure
#23.

Combustion
The combustion system is based on a fully
modulating forced draft combustion air blower(s), a
negative pressure regulated gas valve, and a 100%
premix burner. On a call for humidity, the combustion
air blower(s) starts and creates a negative pressure(s)
across an orifice located at the air inlet. The blower is
energized to purge the system, then the hot surface
ignitor is activated. During this time the electronic
ignition module does a diagnostic check of safety
systems including the air proving switch which senses
the negative pressure at the air inlet orifice. After the
function of the safety systems has been verified, the
gas valve(s) will open and the gas/air mixture is ignited
by the hot surface ignitor. If a flame is sensed by the
flame sensor, the gas valve(s) remains open and
combustion continues. If a flame is not sensed, the
above sequence is repeated to a maximum of three
times after which the ignition module will lock out. The
gas valve(s) maintains a constant ratio air to gas
independent of blower speed or external conditions.
This air and fuel is thoroughly mixed in the blower(s)
and then forced through the burner ports where
ignition occurs.

· GS Outdoor models can develop steam
pressures up to 12”w.c. to overcome duct and
steam line pressures. Pressures above 12”w.c.
will cause steam to exit through the drain line.
· Steam lines can be routed to an air handler on
the roof or pipe chased (external to the unit)
through the rooftop to enter the building.
· All steam lines must be insulated to reduce
losses.
· For steam line installation guidelines, consult the
distribution system installation manual (Steam
Distributor Installation Manual Form #XX-231 and
SAM-e Short Absorption Manifold Form
#XX-249).
Figure #23
Steam Connection

BH Venting
Supplied

Hot products of combustion are forced through a
baffle inside the heat exchanger and then vented
outside. The heat exchanger has a large flat surface
to minimize scale build-up and promote scale
shedding to the bottom of the tank. This self-cleaning
action helps to maintain the efficiency of the heat
exchanger while the smooth surfaces allow for easy
cleaning when necessary.

Cuff hose and
clamps provided

The GS 100 has a single removable combustion
chamber/heat exchanger. The combustion system is
duplicated on larger units with multiple chambers
inside a common tank.

Steam line
(Insulation
recommended)

WATER MANAGEMENT
The GS Series of humidifiers is equipped with a
unique float chamber water level monitoring device.
Two magnetic floats (one is a backup) measure 5
different water levels in the humidifier for proper
operation. The float chamber and board are located
away from the boiling action to increase reading
accuracy and reduce mineral build-up since it is not in
the boiling water. The float chamber is connected to
the tank under the water level and above the water
level to ensure equalization of pressure between the
tank and float chamber. In addition, cooling water is
introduced in the float chamber to reduce scale
build-up. The unit also includes an internal 1” air gap
and a vacuum breaker to prevent siphoning effect.
- 22 -

Qualified personnel must correct any deficiencies
with the installation before commissioning takes place.

On initial start-up, the solenoid operated fill valve
fills the tank. The water level reaches the backup float
first and then the main float. If the backup and main
floats do not read the same water level during the
operation of the unit, the unit will shut down on a fault.
The unit will continue to fill the unit to the top green
position. The drain pump will then be energized to
drain the water level down to just below the bottom red
position and then the fill valve will energize again to fill
the unit to the middle yellow position. During this time
the software is performing a test on the fill valve and
drain pump.

Prior to starting the humidifier, it is necessary to
ensure that no dirt or dust has accumulated in the
electronics compartment or the burner area. A build
up of dust on the electronics can cause overheating
and early failure of the components. If necessary,
clean the area around thehumidifier to prevent
contaminants from being drawn into the combustion
blowers.
FILLING THE SYSTEM

If a demand signal is present, the unit will then
begin the combustion sequence. As the unit operates,
the fill valve with be pulsed to maintain the water level
between the yellow and green positions. During steam
production the unit will also check if the floats and
drain pump are operational by activating a drain
sequence every 24 hours. (adjustable to time of day)

Before the GS unit will initiate combustion it must
be filled with water and the internal controller must
have completed a self-test to verify that the water fill
system, level controller, and drain pump are
functioning correctly.
· Close the shut-off valve in the gas supply line
· Remove any demand signal to the unit

START UP PROCEDURE

· Open the shut-off valve in the water supply line

Figure #24
Plumbing Connections

Fill Chamber

Presure Equalizer

· Switch the humidifier on
· The fill valve will energize and the tank will begin
to fill (fill time is approximately 10 to 30 minutes
depending on unit size). Once the float chamber
has registered low water level, the unit will
perform an internal test of the fill and drain
system as described in the Water Management
section

Vacuum Break

Main Fill to System

Dual Fill Valve
Drain Outlet

· At the completion of the test, the float chamber
will indicate middle float position (green LED) and
the unit will go into standby mode until a demand
signal is received

Internal Trap

Drain Pump
Aux. Drain

· Proceed to the safety shut-off test
Float Chamber

TESTING THE IGNITION SAFETY SHUT-OFF
Test the ignition system safety shut-off in the
following method.
START-UP CHECKLIST

· Close the shut-off valve in the gas supply line

Before the GS humidifier is operated for the first
time, a complete inspection must be performed to
ensure that the installation and all water, gas, steam,
electrical and venting connections to the humidifier
conform to the guidelines in this manual. Complete
the checklist on pages 25 & 26 before commissioning
the unit.

· Set the demand signal to the humidifier to 100%
· Ensure all external controls connected to the
security loop are closed
· Switch the humidifier on

- 23 -

· At the completion of the float test, the humidifier
will begin the combustion sequence by energizing
the combustion blowers

· At the completion of the float test, the humidifier
will begin the combustion sequence and each
burner will ignite in sequence

· All blowers will run at full output for 30 seconds to
pre-purge the combustion chamber. During this
time the controller will monitor that all air proving
switches closed to prove air flow

· Depending on the system demand the
combustion blowers will modulate faster or slower
to control the burner input
· The water in the tank will heat up and begin to
boil, delivering steam to the distribution system

· The igniter(s) will be energized for 15 seconds,
allowing it time to heat to the appropriate ignition
temperature and the gas valve will be energized

· During the boiling sequence the water fill valve
will periodically activate to replenish water that
has evaporated from the tank

· After 4 seconds both the gas valve(s) and the
igniter will be de-energized

· Once the humidity requirements have been
satisfied (demand drops below minimum %) all
gas valves will be de-energized and the blowers
will be shut off after performing a post purge of
the combustion chamber

· After three trials for ignition (complete with
pre-purge) the red LED on the ignition control
module will begin blinking to indicate a safety
lockout and a fault message will be displayed on
the humidifier display

· The humidifier will go into standby mode until the
next call for humidity (demand rises above
minimum %) at which time the unit will again
begin the combustion sequence

· NOTE: On multiple burner models, each burner
tries to ignite in sequence. It is necessary to wait
for all burners to cycle to complete the test.
· Manually re-open the gas supply to the
humidifier. No gas should flow to the burner(s)

TAKING OUT OF OPERATION
If it is required that the humidifier be taken out of
operation (e.g. for service or end of season
shut-down), proceed as follows:

· To reset the humidifier, shut off the power switch,
then turn the power back on

· If the unit is firing, remove the demand signal or
open the security loop, allowing the burners to
shut off and the blowers to perform a post purge
of the heat exchangers before shutting off

STARTING THE HUMIDIFIER
Once the tank has been filled and the ignition
safety test has been performed as outlined above, the
humidifier is ready to be put into operation.

· Switch the main power switch from On to Off and
then to the Drain position. The drain pump will be
energized and the tank will begin to drain

· Verify that the inspection checklist has been
completed and all deficiencies with the
installation have been corrected
· Open the shut-off valve in the gas supply line

· Once the tank has completely emptied shut off
the drain switch

· Open the shut-off valve in the water supply line

· Close the shut-off valve in the gas supply line

· Ensure all external controls connected to the
security loop are closed
· Verify that the building demand signal is
connected to the humidifier
· Install and secure all cabinet service doors
· Switch the humidifier on

- 24 -

GS INSPECTION CHECK LIST
HUMIDIFIER MOUNTING
£ Verify proper clearances around the unit
£ Humidifier mounted level
£ Humidifier properly secured to stand and stand bolted to floor
£ All service doors accessible
£ Roof curb sized correctly (Outdoor Model Only)
GAS PIPING
£ Correct gas line size installed
£ Certified manual shut off valve and union installed
£ Sediment trap installed
£ Gas piping leak tested
£ Air purged from lines
£ Proper gas supply pressure
£ Regulator dedicated for each gas unit
EXHAUST GAS VENTING
£ Comply with local regulations
£ Proper venting materials used (B or BH) – refer to gas codes
£ Maximum vent length of 100 feet (70 feet for direct vent models)
£ Proper pipe diameter used
£ Condensate tee installed
STEAM LINES
£ Slope up 2” per 12”
£ Sloped back to drain
£ Slope down ½” per 12”
£ Trapped 2” more than static duct pressure
£ Traps
Size _______
£ Insulated
£ Length/Size ____________
£ 90 deg. Elbows qty: ____
£ 45 deg. Elbows qty: ____
£ Can condensate be trapped anywhere in the steam line? yes £ no £
CONDENSATE LINES
£ Sloped back to drain
£ Trap is greater than 2” duct static pressure
£ Size of trap_______

- 25 -

SUPPLY WATER LINE
£ Nortec supplied adapter installed on fill valve (½”NPT)
£ Manual shut off valve and union installed
£ Verified pressure (30 – 80 psig)
£ Water source of 10 l/min (2.6 gpm)
£ Leak tested
£ ½” dia. At max 4ft of the unit
DRAIN LINES
£ Air gap located within 3ft of the unit
£ Minimum drain line size of 1” in dia.
£ Downward slope
£ Tundish (funnel) installed to provide air gap
£ Temperature rating of piping
£ Hose connections tightened
£ Auxiliary drain piped with shut off valve to tundish
WATER QUALITY
- Well water £
- City water £
- Softened water £
Conductivity:_______mhmos Hardness: _______GPG
pH:_______

- RO/DI water £
Silica____ppm Chlorides:_______ppm

NOTE: Failure due to chloride corrosion is not covred under Nortec’s standard warranty. Consult
factory for more information.

ELECTRICAL INSTALLATION
£ Comply with local regulations
£ Proper supply voltage (must match rating plate) and breaker size
£ Electrical disconnect switch close to humidifier
£ Cables properly affixed
£ Low voltage wiring & control signal(s) wired to correct terminals
£ Humidifier configured for correct control signal(s)
TYPE OF CONTROLS INSTALLED/ LOCATION/ WIRING/ SETTING
£ High Limit ______________________________
£ Air Proving _____________________________
£ Modulation Control________________________
£ On/Off Control ___________________________
£ Controls by Nortec________________________
£ Controls by Others________________________

- 26 -

Figure #25
Site Water Test Kit P/N 1507214

· Close the shut-off valve in the water supply line
· Isolate the humidifier from the electrical power
supply at the main disconnect switch

SCALE MANAGEMENT
The gas humidifier will periodically “blowdown”
water from the tank to reduce the concentration of total
dissolved solids that accumulate during long term
operation. Gas Humidifiers are shipped factory set
with a blowdown of 25%. This setting ensures that
scale build-up will be minimized for all water
conditions.
Once the water conditions are known, the
blowdown rate can be adjusted by software (GSTC
models) or by using dip switches on the logic control
board (GSP models).
Note: Water quality conditions resulting in
component failures are not covered under NORTEC’s
standard warranty.

Another effective means of controlling the amount
of scale in the tank is with the use of the Full Tank
Blowdown (FTBD) built into the software. When this
feature is activated, the drain pump will be energized
to drain the entire contents of the tank and then the
tank will be refilled with fresh water, thus keeping the
amount of total dissolved solids to a minimum. The
feature can be programmed in the software to occur
after a specific amount of operating time and can also
be triggered by a signal sent to the humidifier from a
building management system.

· Silica Test: Measured in ppm (parts per million)
Follow the directions with the kit. A high reading
will decrease the performance of your system.
The recommended operating range for silica is 0
ppm to 14 ppm. Note: A high silica content along
with a high hardness content may increase the
service intervals of the system . Consult the
factory if this condition exists at the site.

WATER QUALITY

· Hardness: Measured in gpg (grains per gallon).
Follow the instructions on each individually
wrapped test strip and use the colour chart
provided. The recommended operating range for
hardness is 0 gpg to 12 gpg. Note: High
hardness along with high silica may increase the
service intervals of the system. Consult the
factory if this condition exists at the site.

Due to the wide range of water conditions found
throughout North America it is important that the
blowdown is set according to the local water
conditions. By water conditions we are referring to the
hardness of the water supplied to the humidifier. The
hardness is measured in grains per gallon. It is also
important to test for silica content. Silicates may cause
foaming and contribute to scale buildup in the
humidifier tank and float chamber.

· pH: Follow the directions on the test strip bottle.
The recommended operating range for pH is 6.5
to 7.5 on the colour scale. Consult the factory if
outside these parameters.

If you are unaware of the hardness or silica
content of your water supply, there are many “do it
yourself” kits which can be purchased, or there are
several companies that will perform the tests for a
reasonable price. You can even contact your
municipality for your water condition or order the
NORTEC water test kit.

· Chlorides: Measured in ppm (parts per million).
Follow the directions on the test strip bottle. The
recommended level for chlorides is not to exceed
25 ppm.
NOTE: Failure due to chloride corrosion
is not covred under Nortec’s standard warranty.
Consult factory for more information.
· High levels of chlorides will attack stainless steel.
Consult the factory for additional information if
your water contain high levels of chlorides.
- 27 -

· Conductivity: Measured in micromhos. Follow
the directions for the conductivity pen found
inside the box. Multiply the digital reading by 1.5.
The recommended operating range for
conductivity is 0 - 1500 micromhos. Consult the
factory is you measure outside these parameters.
Technology

GasFired

Water
Type

A history of all faults is stored in memory of
the software and can be viewed through the service
level on the display. Refer to the keypad display menu
structure at the end of the manual.
GSP MODELS
Faults are indicated on GSP models with a fault
code on the small display screen attached to the logic
control board. The display can be viewed by removing
the front electrical door. Check the display for the fault
code before shutting off power to the unit. Resetting
the humidifier clears the fault. This can be achieved
by shutting off the power switch, then turning it back
on, or by pressing the reset button on the logic control
board. A list of all fault codes and the type of fault they
represent is located near the back of the manual.

Hard- Silica Alkalin. Chlor.
ness Range Range Range
Range Range
Water
Cond.

Microm
hos

GPG

PPM

Potable 0-1500

0-12

0-14

6.5-7.5

0-25

Treated 0-100

0-1

7-7.5

0-25

· NORTEC recommends performing a semi-annual
water analysis to ensure optimal performance.

MAINTENANCE

· The humidifier is intended to operate on cold
potable tap water.

To ensure proper performance and long operating
life of the GS humidifier, it is recommended that the
appliance and installation be inspected at least once a
year by a qualified service person. A proper
maintenance schedule should be followed. Since the
amount and type of maintenance required is generally
as a result of how much the humidifier operates, all GS
humidifiers monitor the amount of steam produced
over time and will indicate when service is required.
All units come factory set with a service interval of 500
hours. This service interval can be adjusted through
software (GSTC models) or by dip switch settings
(GSP models) on the logic control board.

· DO NOT use a hot water source to supply the
humidifier. Minerals will adhere more easily to
surfaces and the fill valve's small flow regulating
orifice could become plugged.
· Consider using a water softener. Longer
operating times between tank cleaning will be
reached on softened water.
· Reverse osmosis (RO) water can provide very
long times before cleaning is required since it is
cleaner than softened water. Deionized (DI)
water may be used with all models. Consult your
NORTEC representative for quote on a water
treatment system.

All maintenance work must be performed by
experienced and trained personnel.
Periodic cleaning of the screens in the vent
terminal (where applicable) is recommended.

SAFETY INSTRUCTIONS

NOTE Use only NORTEC original parts to
replace damaged or defective components. Failure to
do so may cause improper operation of the humidifier
and will void warranty.

Refer to front cover and page 1 of this guide.

FAULT CONDITIONS

DRAINING THE TANK

This appliance is equipped with a self diagnostic
ignition module which identifies a fault code when it
occurs. Refer to the fault & warning list on pg 60.

· During extended periods of inactivity such as off
season or periods of very low demand, it is
advisable to drain the water from the tank. On all
models this is accomplished by switching the unit
to “Drain”.

GSTC MODELS
Faults are indicated with a fault message on the
display of GSTC models. Recovery from lockout
requires resetting of the humidifier. This can be
achieved by momentarily shutting off the power switch
then turning it back on, or by pressing the reset button
on the logic control board mounted inside the electrical
cabinet.

· Do not remove the front clean out port on the
tank until the unit has completely drained. On GS
300-600 units do not remove the top clean out
ports on the tank unless the water has cooled or
the unit has completely drained.
- 28 -

- 29 X

Gas Venting

H/L Stack Sensor

Drain Lines

Fill Lines

Direct Vent

Float Chamber

Drain Lines

Gas Burner

Tank

END OF
SEASON

Flame Sensor

MID

30 DAYS
after initial
start-up

Hot Surface
Ignitor

PARTS

- Visual check that sensor is intact, wired and
attached to the exhaust.

- Inspect for leaks. Ensure intake terminal is clear.

- Inspect for leaks. Ensure terminal cap is clear and
any condensation produced flows to condensate
traps. Flue temp should be between 350-400ºF.

- Inspect for leaks at the drain pump, fill cup and
float chamber.

- Inspect for leaks.

- Clean scale from float chamber and hose
connecting to hit.

- Clean tank.

- Clean tank when required.
- Ensure floats move freely.

- Drill out tank nipples when required to
ensure nipples are not blocked with scale.

- Replace hot surface ignitor and flame
sensor with replacement kit.

PREVENTIVE MAINTENANCE

- Adjust blow down time when required. Check that
scale has not accumulated above 2".

- Switch to drain and make sure water flows freely.

NOTE: It is recommended to replace the burner
gasket each time a burner is removed.

- Remove from the unit and clean with compressed
air from outside matting.

- Clean sensor with fine steel wool.

- Check that Flame Sensor is straight.

- Check for continuity.

REGULAR MAINTENANCE

WHAT NEEDS TO BE DONE?

MANDATORY MAINTENANCE SCHEDULE

· Ensure that power is switched on again during
periods of demand.

exchanger walls. DO NOT use a metal scraper that
will scratch the stainless steel surfaces of the tank.
Once all large pieces of scale have been removed,
vacuum the tank out with a shop vacuum, fill part way
with water, and flush remaining sediment from the tank
through the drain.

· The GSTC model of the Gas Steam humidifier
includes a pre-cleaning sequence feature. When
activated (through the keypad), the unit will flush
the humidifier, refill with cold water, and flush
again reducing the scale accumulated at the
bottom of the tank.

Due to the presence of polymer gaskets around
the heat exchanger, do not use any harsh cleaning
chemicals. Please consult NORTEC prior to using any
chemicals. Once the lid has been replaced, fill the unit
with water and examine for leaks.

CLEANING THE STEEL TANK
CAUTION: Water and scale may be hot enough
to cause burns. Turn off humidifier and allow it to cool
before cleaning.

Inspect the drain and fill lines assembly for scale
build-up and if necessary remove them from the
humidifier for cleaning. If the blowdown assembly
becomes blocked, scale build-up in the tank will be
accelerated and damage to the humidifier could result.
The drain pump may be opened and cleaned. Consult
NORTEC for proper procedure.

It is recommended that the tank be cleaned at
least once every season to maintain optimum
operation. It may be necessary to increase the
frequency of cleaning or increase the blowdown
setting in areas of hard water or prolonged annual
usage (see the Blowdown Setting section of this
manual).

Reassemble the drain and blowdown if they were
removed. Re-install tank top and side lids making sure
tank cover gasket is intact. Do not over tighten hold
down nuts. If using a torque wrench do not exceed
50 in/lb (5ft/lb). Re-seal all cabinet lids.

Cleaning of the humidifier is mandatory and must
be performed on a regular basis.

Cleaning the float chamber is accomplished by
removing the hold down screws to access the floats
and using a small brush to gently clean the scale from
the floats and chamber. Ensure that floats are back in
place and o-ring is properly seated before tightening
screws on float chamber. Special attention must be
used when removing or re-installing the float chamber.

To reduce cleaning time, use the pre-cleaning
sequence on the GSTC model to help evacuate
mineral debris from the unit. Check the controller
operation to activate this feature.
The combustion chamber walls are usually self
cleaning. The mineral buildup flakes off, due to the
expansion and contraction and violent boiling action
during on/off cycles, and settles to the bottom of the
tank. The combustion end block will have scale build
up, as will the heat transfer tubes. These surfaces
must be cleaned at regular intervals.

Figure #26
Cleaning Tank Access

Frontal port cleaning will be done through the front
door of the unit. Remove cabinet door on the left of
the LCD display using a Philips screwdriver. Remove
the side tank port opening, by removing the 3 / 16 nuts
(½” key or socket is needed).
Additional clean out ports are available on the top
of the 300/400 and 500/600 lb/h tanks. To access
these ports, remove the top cabinet panel using a
Phillips screwdriver. Remove the top clean out ports
my removing the nuts.
Removal of the heat exchanger(s) is not
necessary to clean the inside of the tank.

Torque: 50 in-LB (5.7 NM)

Scoop out loose scale with a small shovel such as
those used for gardening. Once loose scale is
removed, use a scraper such as a plastic windshield
scraper to remove scale adhering to the tank or heat
- 30 -

NOTE: Proper polarity of supply voltage to the
unit is necessary for flame sensing to occur. Oxidation
on flame sensing rod can reduce measured current.
The oxidation can be cleaned from the sensing rod
using steel wool or an emery cloth.

The switch board must be replaced into the same
position as before cleaning and the tie -wrap must be
used to hold the float chamber in position.

SERVICING THE UNIT

Igniter Check

Caution: Disconnect power before servicing this
appliance.
Caution: Label all wires prior to disconnection
when servicing controls. Wiring errors can cause
improper and dangerous operation.

If the igniter is suspected of being defective then
the following test may be carried out;
1. Ensure that the power and gas is switched off
before servicing.

The combustion chamber, heat exchanger and
flue baffles are all fabricated from stainless steel and
do not require internal cleaning.

2. To test the igniter, disconnect the igniter leads
from their terminal connections.

Should the main burner fail to light, or flame is not
detected during the first trial for ignition period, the gas
valve is de-energized and the control goes through an
interpurge delay before another ignition attempt. The
control will attempt two additional ignition trials before
going into lockout. The valve relay will be
de-energized immediately, and the combustion blower
will be turned off.

3. Using a multimeter set the Ohm’s scale and
place one of the meter leads on one of the
igniter wire ends and the other meter lead on
the end of the other igniter wire.
Gas Valve Setting
The gas valves used in the GS series humidifier
are negative-pressure-regulated valves. The valve
setting listed on the product rating plate is shown
relative to atmosphere – this setting will always remain
constant.

SERVICE CHECKS
COMBUSTION BLOWER

The valves come preset from the factory for the
correct gas type. If an adjustment is required, use the
following steps:

The combustion air blower motors are
permanently lubricated and do not require lubrication.
Clean out any dust that has accumulated in the blower
housing using an air gun.

1. Remove the screw from the pressure port
marked “out” on the back side of the gas
valve.

BURNER

2. Connect a hose from a digital manometer (or
an inclined manometer capable of reading
below 0.1”w.c.) to the “out” pressure port.

The burners are made of ceramic fabric material
and operate in the infrared mode. Depending on the
environment, the burner(s) may require removal of lint
or grease-laden dust periodically. This may be
achieved by removing the burner and applying
pressurized air to the external surface of the material.
Refer to the Servicing Section related to burner
removal.

3. Activate the humidifier and measure the gas
valve pressure once the valve is energized
and a flame is established in the combustion
chamber. Verify this pressure to the pressure
listed on the unit specification label.

Flame Sensor

4. If the pressure needs adjusting, remove the
locking cap on the top of the gas valve.

Flame current is the current which passes through
the flame from the sensor to ground. The ignition
module must detect a minimum flame current of 0.7
microamps or a flame proving lockout will occur. To
measure flame current, connect an DC micrometer to
the FC- FC+ terminals on the module. Meter should
read 0.7 uA or higher. If meter reads below “0” on
scale, meter leads are reversed. Disconnect power
and reconnect meter leads for proper polarity.

5. Below the locking cap is an adjustment screw.
Increase the pressure by turning the
adjustment screw clockwise, decrease by
turning counter-clockwise.
NOTE: The pressure will fluctuate slightly as
the unit operates, especially with very
sensitive measuring devices. Use the mean
pressure value as the set pressure.
- 31 -

6. Once the pressure has been adjusted, replace
the locking cap.

gasket when replacing the flame sensor and
igniter.

7. Replace the screw in the “out” pressure port
and tighten firmly.

CAUTION: The silicon carbide igniter is
breakable. Handle with great care to avoid
damage.

COMPONENT REPLACEMENT

Burner Removal and Installation

CONSULT FACTORY PRIOR TO THE
REPLACEMENT OF ANY COMPONENT.

1. Shut off electrical power and gas supply to the
humidifier.

All service work must be performed by
experienced and trained personnel.

2. Remove the right side service access door.
3. Disconnect all wiring to the combustion
blower, gas valve, air proving switch, igniter
and flame sensor (note the connector
assignment).

Only use original NORTEC spare parts to replace
defective components. Damage caused by
non-approved parts is not covered under NORTEC’s
standard warranty.

4. Undo the union on the flexible gas hose and
disconnect the gas hose from the gas valve.

Hot Surface Igniter and Flame Sensor
Replacement

5. Undo the 4 nuts on the blower outlet and
remove blower, leaving the gas valve/air inlet
assembly and the fan-board mounting bracket
(if present) mounted to the blower.

1. Shut off electrical power and gas supply to the
humidifier.
2. Remove the right side service access door.

4. Unscrew the fixing nuts for the igniter and
flame sensor. Carefully remove the igniter and
flame sensor.

6. Undo the 4 large nuts that secure the burner
mounting plate to the face of the heat
exchanger and carefully remove the burner
assembly. Handle the burner only by the
metal surfaces. Do not grip the ceramic
matting as grease, dust or dirt can affect the
performance of the burner.

5. Reverse the sequence above to install the new
igniter and flame sensor. Always install a new

7. Reverse the sequence above to re-install the
burner after cleaning or, if necessary, replace

3. Disconnect all wiring to the igniter and flame
sensor.

Figure #27
Flame Sensor and Ignitor Assembly

Figure #28
Burner Assembly

Hold Burner only on metal pipe

Ceramic Matting DO NOT TOUCH!

- 32 -

any gaskets that may be damaged. When
mounting the gas valve/air inlet assembly to
the combustion blower, ensure that the cork
gasket is properly oriented or gas flow through
the valve will be impeded.

with a new burner. Inspect and replace any
gaskets that may be damaged. Tighten the 4
brass nuts of burner mounting plate to a
torque of 95 in-lb.
8. Leak test the gas train before
re-commissioning the humidifier.

9. Leak test the gas train before
re-commissioning the humidifier.

Removal and Installation of the Combustion
Blower

Gas Valve Replacement

1. Shut off electrical power and gas supply to the
humidifier.

2. Remove the right side service access door.

3. Disconnect all wiring to the combustion
blower, gas valve and air proving switch (note
the connector assignment).

3. Disconnect all wiring to the gas valve and air
proving switch (note the connector
assignment).

4. Undo the coupling on the flexible gas hose
and disconnect the gas hose from the gas
valve.

5. Undo the 2 screws that mount the gas
valve/air inlet assembly to the blower and
remove the assembly.

5. Remove the hoses from the air proving switch
(note the connection layout).
6. Undo the 2 screws that mount the gas
valve/air inlet assembly to the blower and
remove the assembly.

6. Undo the 2 screws of the fan-board mounting
bracket (if present) and remove bracket,
leaving electronic board and igniter jump start
module(s) attached.

7. Undo the 4 screws and remove the gas pipe
connection from the inlet of the gas pressure
regulating valve.

7. Undo the 4 nuts on the blower outlet and
remove blower.

8. Undo the 3 screws that hold the air inlet
venturi to the gas valve. Remove the rubber
grommet and brass orifice mounted in the
outlet of the gas valve.

8. Reverse the sequence above to install the
new combustion blower. Inspect and replace
Figure #29
Combustion Blower Replacement

9. Undo the 3 screws of the pressure switch
support bracket and remove the assembly
from the gas valve.
10. Reverse the sequence above to install the
new gas pressure regulating valve. Inspect
and replace any gaskets that may be
damaged. When mounting the gas valve/air
inlet assembly to the combustion blower,
ensure that the cork gasket is properly
oriented or gas flow through the valve will be
impeded.

- 33 -

5. Remove screws (2) holding the switch.

Figure #30
Gas Valve Replacement

6. Reverse above procedure to re-install.
Float Chamber Replacement
1. Drain the contents of the tank and then shut
off electrical power and water supply to the
humidifier.
2. Remove the left front service access door.
3. Remove the cable connection to the float
board.
4. Remove the hose clamps on the float chamber
and remove all hoses (note the correct hose
assignment).
5. Squeeze both sides of the mounting bracket to
release it from the slots in the support bracket
behind the float chamber.
11. Leak test the gas train before
re-commissioning the humidifier.

6. Reverse the above sequence to install the
new module.

Air Switch Replacement
7. Leak test all water connections before
re-commissioning the humidifier.

1. Shut off electrical power to the appliance.

Figure #32
Float Chamber Replacement

2. Remove right side service panel.
3. Remove wiring connections to switch.
4. Remove pressure hose(s) from switch noting
proper location.

Figure #31
Air Switch Replacement

- 34 -

Ignition Module Replacement

Figure #34
Transformer Assembly

1. Shut off electrical power to the humidifier.
2. Remove the front electrical access door.
3. Disconnect all wiring connections to the
ignition module, labeling as required.
4. Remove the 2 screws securing the ignition
module and remove.
5. Reverse the above sequence to install the
new module.

Figure #33
Ignition Module Assembly
Fill Valve Replacement
1. Shut off electrical power and water supply to
the humidifier.
2. Remove the right side service access door.
3. Remove all wiring connections to the fill valve.
4. Remove the hose clamps on the fill valve
outlets and remove hoses (note the correct
hose assignment).
5. Remove the 2 screws securing the fill valve to
the cabinet and remove the valve.
6. Reverse the above sequence to install the
new module.
Transformer Replacement
7. Leak test all water connections before
re-commissioning the humidifier.

1. Shut off electrical power to the appliance.
2. Remove front access door.

Figure #35
Fill Valve Replacement

3. Disconnect wiring connections from
transformer leads labeling as required.
4. Remove screws (2) holding transformer.
5. Reverse above procedure to re-install.

- 35 -

Drain Pump Replacement
1. Drain the unit completely. If the pump is
broken use the auxiliary drain out port.
2. Shut off electrical power to the appliance.
3. Remove front and right doors.
4. Remove wiring connections to the pump.
5. Remove hoses attached to the pump.
6. Reverse above procedure to re-install.
NOTE: To avoid water spillage (some water
will be left on the tank bottom after manual
draining) use shop vac to remove left over
water.
Figure #36
Drain Pump Assembly

Fill Box Replacement
Leak test all water connections before
re-commissioning the humidifier.

- 36 -

Removal of Heat Exchanger

Figure #38
Heat Exchange Assembly

1. Take the humidifier out of operation.
2. Disconnect the gas supply pipe from the
connection on the humidifier and close off the
pipe.
3. Unlock and remove the right side panel(s).
4. On Direct Vent units only: Remove hoses
from air intake manifold and air inlet elbows.
5. Dismount flue gas pipe at the flue gas outlet
connection.
6. On Direct Vent units only: Dismount air
supply pipe at the air supply connection.
7. Unlock and remove the left and the right top
panels.
8. Free all cable connections to the components
(combustion blower, ignition module, air
pressure switch, etc.) of the respective heat
exchanger.
IMPORTANT: Note the connector assignment.
9. Undo the coupling of the respective flexible
gas pipe and remove the flexible gas pipe.
10. Dismount the burner with the air blower and
the gas pressure regulating valve of the
respective heat exchanger.
11. Unscrew the nuts and remove the flue gas
manifold from the tank.
12. Unscrew the nuts on the heat exchanger and
pull out the heat exchanger from the tank.
Re-installation is carried out in the reverse
sequence. Replace all seals with new ones.

- 37 -

- 38 -

3 DAY DRAIN
3 DAY DRAIN FUNCTION

SW3/7

Function Disabled

OFF

Function Enabled (Factory set)

KEEP WARM
3 DAY DRAIN FUNCTION

SW5/7

Function Enabled

Function Disabled (Factory set) - 3 day drain

OFF

MAINTENANCE (GSP)
MAINTENANCE INTERVAL (GSP)

SW3/8

500 hour (Factory set)

OFF

1000 hour

ANALOG CHANNEL 1
Input Range

SW1/1

SW4/1

SW 4/2

0-10V input

OFF

0-5V input

OFF

2-10V input

OFF

1-5V input

OFF

0-20mA input

OFF

0-10mA input

OFF

4-20mA input

OFF

2-10mA input

Input Range

SW1/2

SW4/3

SW 4/4

0-10V input

OFF

0-5V input

OFF

2-10V input

OFF

1-5V input

OFF

0-20mA input

OFF

0-10mA input

OFF

4-20mA input

OFF

2-10mA input

ANALOG CHANNEL 2

- 39 -

INPUT CHANNEL
DUAL CHANNEL FUNCTION

SW4/5

One Channel Input

OFF

Dual Channel Inputs

TIME PROPORTIONING
TIME PROPORTIONING

SW4/7

Disabled (Factory set)

OFF

Enabled

BLOWDOWN (GSP)
BLOWDOWN

SW5/1

SW 5/2

SW5/3

OFF

10%

OFF

15%

OFF

20%

OFF

25% (Factory set)

OFF

30%

OFF

35%

MAINTENANCE SHUTDOWN
MAINTENANCE SHUTDOWN FUNCTION

SW5/4

Unit will shutdown 72 hours after service time expired, by generating an error.

OFF

Unit will display warning but continues to operate. (Factory set)

FULL TANK BLOWDOWN
FULL TANK BLOWDOWN FUNCTION

SW5/8

Disabled

OFF

Enabled (Factory set)

- 40 -

NORTEC TC CONTROLLER
Menu Structure

INTRODUCTORY SCREEN

MAIN MENU

NORTEC GSTC-400
VERSION X.XX

SYSTEM LOCKOUT

SYSTEM STATUS
SERVICE LEVEL
USER SETTINGS

09.05.02 9:30

USE THE
UP/DOWN
ARROWS
TO MOVE THE
POINTER TO
SELECT A
MENU ITEM.
TO OPEN THE
SELECTION,
PRESS THE ENTER
BUTTON.

NOTES:
Go To: System Status - page 22
Service Level - page 24
User Setting - page 26

Keypad Display Menu Structure
GENERAL
- 41 -

SYSTEM STATUS 1 of 2

MAIN MENU
SYSTEM STATUS
STATUS:
USER SETTINGS

LOCKOUT

DEMAND CHANNEL 1 0%

ENTER

DEMAND CHANNEL 2 0%

CAPACITY LIMIT

BURNERS ACTIVE

X/X

OUTPUT/BURNER

XXXLB

2
3

TOTAL OUTPUT

2. ONLY VIEWED IF UNIT
IS CONFIGURED FOR
DUAL CHANNEL.

1. DISPLAY WILL SHOW NUMBER
OF BURNERS AND
DISPLAYS THE NUMBER OF
ACTIVE BURNERS.

SYSTEM DEMAND XXX%
MENU

1. DISPLAY TOGGLES BETWEEN
LOCKOUT, ACTIVE, AND STANDBY,
DEPENDING ON SYSTEM DEMAND

XXXLB

2. DISPLAYS THE OUTPUT PER
BURNER IN POUNDS PER HOUR
OR KG/HR.
3. DISPLAY OF TOTAL SYSTEM
OUTPUT IN LBS/HR [KG/HR]

WATER LEVEL:
MENU

1. DEPENDING ON WATER LEVEL,
WILL DISPLAY 0 - 5.

FILL VALVE

DRAIN VALVE

OFF

2. TOGGLES BETWEEN ON, OFF,
AND PULSED.

DRAIN COOLING: SMART

3. TOGGLES BETWEEN ON AND OFF
4. DISPLAYS USER SETTING, ON, OFF,
OR SMART

SYSTEM STATUS
2

Keypad Display Menu Structure
System Status 1 of 2
- 42 -

SYSTEM STATUS 2 of 2

SYSTEM STATUS
1
MAIN MENU
1. DISPLAYS THE USER
SELECTABLE MAINTENANCE
INTERVAL

SYSTEM STATUS
SERVICE LEVEL
MENU

USER SETTINGS

ENTER

SERVICE INTERVAL
1
XXX
HOURS
REMAINING XXX HOURS

START DATE: MM:DD:YY

SECURITY LOOP

[0/1]

SAFETY SENSORS

[0/1]

TANK SENSORS

[0/1] 3

2. DISPLAYS THE TIME LEFT
BEFORE MAINTENANCE
IS DUE
3. DISPLAYS THE START DATE
OF THE CURRENT SERVICE
INTERVAL

1. DISPLAYS STATUS OF THE
SECURITY LOOP
(O = OPEN I = CLOSED)
2. DISPLAYS STATUS OF THE
SAFETY SENSORS
3. DISPLAYS STATUS OF THE
TANK SENSOR

3 DAY DRAIN

KEEP WARM

OFF

BLOWDOWN RATE
FT BLOWDOWN

25%3
ON

1. DISPLAYS IF FEATURE IS
SELECTED
2. DISPLAYS IF FEATURE IS
SELECTED
3. DISPLAYS PRESENT
BLOWDOWN RATE
4. DISPLAYS IF FEATURE
IS SELECTED.

LOOP BACK

Keypad Display Menu Structure
System Status 2 of 2
- 43 -

SERVICE LEVEL 1 of 2

MAIN MENU
SYSTEM STATUS
SERVICE LEVEL

USER SETTINGS

ENTER

SERVICE INTERVAL
SERVICE HISTORY
FAULT HISTORY
TANK DRAIN
TANK PRE-CLEAN
BURNERS
SHORT CYCLE DELAY

SERVICE INTERVAL
XXX HOURS
1

SERVICE INTERVAL
XXX HOURS

SERVICE (HR)
CHANGE VALUE XXX

CLEAR REMAINDER?

1. VERTICAL ARROW INDICATES ADDITIONAL SERVICE INTERVAL
XXX HOURS
SELECTIONS AVAILABLE BY SCROLLING.

2. USE UP DOWN ARROWS TO
CHANGE HOURS
3

3. PRESSING ENTER CLEARS
THE REMINDER

CLEAR REMAINDER?

SERVICE INTERVAL
SERVICE HISTORY
FAULT HISTORY
TANK DRAIN
TANK PRE-CLEAN
BURNERS
SHORT CYCLE DELAY

1. DISPLAYS THE LAST 10 SERVICE
SERVICE HISTORY X/Y 1 PERIODS
2. DISPLAYS THE NUMBER OF STEAM
2
STEAM HOURS XXXX
HOURS WHEN SERVICE WAS
PERFORMED
3
(DATE/TIME)
3. DISPLAYS THE DATE THE SERVICE
WAS PERFORMED

FAULT HISTORY X/Y
(TYPE OF FAULT)
(DATE/TIME)

THIS WILL DRAIN
CONTENTS OF TANK

1
2

1. DISPLAYS THE LAST 54
FAULTS
2. GIVES A DESCRIPTION OF
THE FAULT TYPE
3. DISPLAYS THE DATE THE
FAULT OCCURRED.

THIS WILL DRAIN
CONTENTS OF TANK
CONTINUE?

1. PRESSING ENTER STARTS THE
TANK DRAIN PROCEEDURE

SERVICE LEVEL
2

Keypad Display Menu Structure
Service Level 1 of 2
- 44 -

SERVICE LEVEL 2 of 2

SERVICE LEVEL
1

MAIN MENU
SYSTEM STATUS
SERVICE LEVEL

USER SETTINGS

ENTER

SERVICE INTERVAL
SERVICE HISTORY
FAULT HISTORY
TANK DRAIN
TANK PRE-CLEAN
BURNERS
SHORT CYCLE DELAY

THIS WILL DRAIN
CONTENTS OF TANK

THIS WILL DRAIN
CONTENTS OF TANK
1

CONTINUE?

1. VERTICAL ARROW INDICATES ADDITIONAL
SELECTIONS AVAILABLE BY SCROLLING.

BURNER 1: ENABLED
BURNER 2: ENABLED
BURNER 3: ENABLED
BURNER 4: ENABLED
BURNER 5: ENABLED
BURNER 6: ENABLED

1. PRESSING ENTER STARTS THE TANK DRAIN PROCEDURE

BURNER 1: ENABLED
BURNER 2: ENABLED
BURNER 3: ENABLED
BURNER 4: ENABLED
BURNER 5: ENABLED
BURNER 6: ENABLED

SHORT CYCLE DELAY

SECONDS XX

CHANGE VALUE

BURNER 1
ENABLED
DISABLED

END

Keypad Display Menu Structure
Service Level 2 of 2
- 45 -

USER SETTINGS 1 of 3

CHANGE TIME
0335

MAIN MENU
SYSTEM STATUS
SERVICE LEVEL

USER SETTINGS

ENTER

DATE/TIME/UNITS
LANGUAGE CONTROLS
WATER MANAGEMENT
CONTROL TYPE
CAPACITY LIMIT
CALIBRATE

TIME

HH:MM

DATE

MM.DD.YY

UNITS:

LB/HR

XX:XX

CHANGE DATE

0335

MM.DD.YY

SELECT UNITS

1. VERTICAL ARROW INDICATES ADDITIONAL
SELECTIONS AVAILABLE BY SCROLLING.

0335

PRESS ENTER TO
SELECT UNITS

LB/HR
KG/HR

DATE/TIME/UNITS
LANGUAGE CONTROLS
WATER MANAGEMENT
CONTROL TYPE
CAPACITY LIMIT
CALIBRATE

SELECT LANGUAGE
ENGLISH
FRENCH
GERMAN

PRESS ENTER TO
SELECT LANGUAGE

USER SETTINGS
2

Keypad Display Menu Structure
User Setting 1 of 3
- 46 -

USER SETTINGS 2 of 3

FTBD HOURS
0335

CHANGE HOURS? XXX

FTBD HOUR
0335

CHANGE HOUR? XX

BLOWDOWN RATE
USER SETTINGS
PAGE 1

0335

CHANGE VALUE XX%
STEAM OUTPUT

MAIN MENU
SYSTEM STATUS
SERVICE LEVEL

USER SETTINGS

ENTER

DATE/TIME/UNITS
LANGUAGE CONTROLS
WATER MANAGEMENT
CONTROL TYPE
CAPACITY LIMIT
CALIBRATE

USER SETTINGS
3

FTBD HOURS
XXX
FTBD HOUR
XX
BLOWDOWN RATE XX%
FLOAT CHECK
HH:MM
FILL CORRCTN
XX%
DRAIN CORRCTN XX%
DRAIN COOL:
SMART
1. VERTICAL ARROW INDICATES
ADDITIONAL SELECTIONS
AVAILABLE BY SCROLLING.

FLOAT CHECK
0335

CHANGE VALUE HH:MM

FILL CORRCTN
0335

CHANGE VALUE XXX%

DRAIN CORRCTN
0335

CHANGE VALUE XXX%

0335

DRAIN COOL
ON
OFF
SMART

Keypad Display Menu Structure
User Setting 2 of 3
- 47 -

USER SETTINGS 3 of 3

USER SETTINGS
2

MAIN MENU
SYSTEM STATUS
SERVICE LEVEL

USER SETTINGS

ENTER

DATE/TIME/UNITS
LANGUAGE CONTROLS
WATER MANAGEMENT
CONTROL TYPE
CAPACITY LIMIT
CALIBRATE

CONTROL TYPE

CONTROL TYPE
CONTROL INPUT
1

0335

TRANSDUCER INPUT

CONTROL INPUT
TRANSDUCER INPUT

PRESS
ENTER TO
SELECT
CONTROL
TYPE

1. VERTICAL ARROW INDICATES ADDITIONAL
SELECTIONS AVAILABLE BY SCROLLING.

SET MAXIMUM
CAPACITY XXX%

DATE/TIME/UNITS
LANGUAGE CONTROLS
WATER MANAGEMENT
CONTROL TYPE
CAPACITY LIMIT
CALIBRATE

CALIBRATE
SIGNAL?

DATE/TIME/UNITS
LANGUAGE CONTROLS
WATER MANAGEMENT
CONTROL TYPE
CAPACITY LIMIT
CALIBRATE

SET MAXIMUM
CAPACITY XXX%

CALIBRATE
SIGNAL
CALIBRATE

4957

END

Keypad Display Menu Structure
User Setting 3 of 3
- 48 -

USE
UP/DOWN
ARROWS
TO SET
MAXIMUM
CAPACITY

PRESS
ENTER TO
CALIBRATE
SIGNAL

NORTEC TC CONTROLLER

User Settings: (password protected)

INTRODUCTORY SCREEN

This section allows the user to set parameters
specific to their requirements. For further details see
specific section below.

NORTEC GSTC-400
VERSION X.XX

Diagnostics: (safety loop protected)

SYSTEM LOCKOUT

Allows the user to activate and monitor various
system operations.

06.07.03 9:30

Service checklist: (not available for first release)
Troubleshooting: (not available for first release)

Product name
NORTEC GSTC (100-600)
Version
The display will indicate the revision level of the
control software
System
Depending on system activity, the display will
toggle between LOCKOUT, ACTIVE or STANDBY.
Date/Time
The actual date and time will be displayed.

MAIN MENU
The main menu lists the available sub menus
where system adjustments can be made. Some of
the menus are password and jumper protected to

SYSTEM STATUS
SERVICE LEVEL
USER SETTINGS
DIAGNOSTICS

block access by unauthorized personnel.
System status
Displays various system parameters as the user
scrolls through the lists. For further details see specific
section below.
Service Level: (password protected)
This section is specific to all service related
activity. For further details see specific section below.
- 49 -

Output/Burner:

SYSTEM STATUS

This field will display the actual output of steam
generated by each burner (kg/hr or lbs/hr).

SCREEN 1:

Total output:

STATUS: LOCKOUT
DEMAND CHANNEL 1 0%
DEMAND CHANNEL 2 0%
CAPACITY LIMIT
0%

This field will display the total system steam output
(kg/hr or lbs/hr).

SCREEN 3:

Status:

WATER LEVEL:
X
FILL VALVE
ON
DRAIN VALVE
OFF
DRAIN COOLING: SMART

Displays the present status of the system.
Depending on system activity at the time, the field
could display: lockout (security loop open), active (unit
generating steam) or standby (security loop closed but
no modulation demand signal).
Demand channel 1:

Water level:

This field will display the modulation demand input
on that channel.

This field displays the present water level detected
by the float system.

Demand channel 2:

Fill valve:

Field only visible if the unit is configured for dual
modulation. This field will display the modulation
demand input on that channel.

This field displays status of fill valve, on, off, or
pulsed.
Drain valve:

Capacity limit:

This field displays status of drain pump, on or off.

This field displays the user adjusted capacity limit
set for the humidifier.

Drain cooling:
This field displays the user (or factory default)
setting.

SCREEN 2:

OFF: fill will not activate when drain is activated.

SYSTEM DEMAND
BURNERS ACTIVE
OUTPUT/BURNER
TOTAL OUTPUT

XXX%
X/X
XXXLB
XXXLB

ON: fill will activate whenever the drain activates.
SMART: fill will activate only when drain water is
hot.

System demand:
This field displays the total system demand as a
percentage.
Burners active:
This field displays the number of active burners
and the number of available burners.

- 50 -

closed the display will indicate “1”. Closed indicates
that the tank temperature is above 160ºF (70ºC).

SCREEN 4:

This input is used for the “keep warm” feature and
for activating the fill valve during blowdown cycles.

SERVICE INTERVAL
XXX HOURS
REMAINING XXX HOURS
START DATE: MM:DD:YY

SCREEN 6:
3 DAY DRAIN
1
KEEP WARM
0
BLOWDOWN RATE XX%

Service interval:
This field displays the user (or factory default)
setting for the humidifiers service reminder in steam
hours.

FT BLOWDOWN

3 day drain
Remaining:

This field indicates if the feature has been selected
(0 = no, 1 = yes).

This field displays the amount of time (steam
hours) remaining before the next service is to be
performed.

Keep warm
This field indicates if the feature has been selected
(0 = no, 1 = yes).

Start Date:
This field displays the date this service interval
began.

Blowdown rate:
This field displays the selected blowdown rate.

SCREEN 5:

Full tank blowdown

SECURITY LOOP [0/1]
SAFETY SENSORS [0/1]
TANK SENSORS [0/1]

This field indicates if the feature has been selected
(0 = no, 1 = yes).

Security loop:
This field displays the status of the security loop
(terminals 1 and 2 on LV terminal strip). If it is open
the display will indicate “O”, if it is closed the display
will indicate “I”.
Safety sensors:
This field displays the status of the safety sensors*
input. If it is open the display will indicate “0”, if it is
closed the display will indicate “1”.
*There are two safety sensors on the GSTC. One
for tank over temperature and one for stack over
temperature. Both sensors are wired in series.
Tank sensor
This field displays the status of the tank sensor
input. If it is open the display will indicate “0”, if it is
- 51 -

SERVICE LEVEL
SERVICE INTERVAL
SERVICE HISTORY
FAULT HISTORY
TANK DRAIN
TANK PRE-CLEAN
BURNERS
SHORT CYCLE DELAY

The service level area is where service related tasks are performed. Below is a description of each field and what
can be performed in them. When a parameter requires a change, press the two arrow keys and enter the password
(0335). As long as you remain in this section, you will not need to enter the password more than once.

SERVICE INTERVAL
SERVICE HISTORY
FAULT HISTORY
TANK DRAIN
TANK PRE-CLEAN
BURNERS
SHORT CYCLE DELAY

MAINTENANCE TIME
XXX HOURS
MAINTENANCE DUE
XXX HOURS

SERVICE INTERVAL
XXX HOURS
CLEAR REMAINDER?

Service interval
In this area the customer can set a service interval for humidifier MAINTENANCE.
MAINTENANCE TIME
XXX HOURS
This field displays the user selected MAINTENANCE time. To change the time selected enter the user code and
adjust the time in SET MAINT. TIME (0-3000 hours, 0 = disabled).
MAINTENANCE DUE
XXX HOURS
This field displays the time remaining until the next service interval. To reset the MAINTENANCE due time, enter
the user code and select CLEAR REMINDER?
SERVICE INTERVAL
SERVICE HISTORY
FAULT HISTORY
TANK DRAIN
TANK PRE-CLEAN
BURNERS
SHORT CYCLE DELAY

SERVICE HISTORY X/Y
STEAM HOURS XXXX
(DATE/TIME)

Service history
In this area the customer can view the history of service maintenance performed on the humidifier.
SERVICE HISTORY X/Y
The service history stores the last 10 service periods.
X = service occurrence, where 1 is the most recent.
- 52 -

Y = total number of recorded services (up to 10 maximum).
STEAM HOURS XXX
(DATE/TIME)
This field displays the steam hours and the date and time when the specific service (X) was performed.
SERVICE INTERVAL
SERVICE HISTORY
FAULT HISTORY
TANK DRAIN
TANK PRE-CLEAN
BURNERS
SHORT CYCLE DELAY

FAULT HISTORY X/Y
(TYPE OF FAULT)
(DATE/TIME)

Fault history
In this area the customer can view the history of recorded faults for the humidifier.
FAULT HISTORY X/Y
The fault history stores the last 54 system faults.
X = fault occurrence, where 1 is the most recent.
Y = total number of recorded faults (up to 54 maximum).
(type of fault) and (date/time)
A description of the fault type is displayed along with a date and time stamp when the fault occurred.

SERVICE INTERVAL
SERVICE HISTORY
FAULT HISTORY
TANK DRAIN
TANK PRE-CLEAN
BURNERS
SHORT CYCLE DELAY

THIS WILL DRAIN
CONTENTS OF TANK

THIS WILL DRAIN
CONTENTS OF TANK
CONTINUE?

Tank Drain
The tank drain feature, when activated, will activate the drain valve for a fixed period of time (depending on unit
size).
To drain the tank press enter when CONTINUE is selected. During the tank drain cycle the display will indicate
the tank is draining and the amount of time remaining on the cycle. To interrupt the cycle the unit must be switched off
then on. Must enter service password to activate this function.

- 53 -

Tank Pre-Clean
The tank pre-clean feature when activated will activate the drain valve for a fixed period of time (depending on
unit size). The fill valve will then activate, filling the tank partially with cold water. At the completion of the fill cycle the
tank will once again drain.
This will help to flush out any accumulated minerals as well as cool the tank for the service personnel.

To pre-clean the tank press enter when CONTINUE is selected. During the tank pre-clean cycle the display will
indicate the tank is draining and the amount of time remaining on the cycle. To interrupt the cycle the unit must be
switched off then on. Must enter service password to activate this function.

Burners
This field allows the user to enable and disable individual burners for service reasons. Depending on the GSTC
model, only the number of burners installed will be displayed
SERVICE INTERVAL
SERVICE HISTORY
FAULT HISTORY
TANK DRAIN
TANK PRE-CLEAN
BURNERS
SHORT CYCLE DELAY

BURNER 1: ENABLED
BURNER 2: ENABLED
BURNER 3: ENABLED
BURNER 4: ENABLED
BURNER 5: ENABLED
BURNER 6: ENABLED

BURNER 1
ENABLED
DISABLED

After entering the user code (0335) the individual burner can be highlighted. Once ENTER is pressed, the burner
can be enabled or disabled.

Short Cycle Delay
The short cycle delay feature can be used to reduce the amount of ON/OFF cycles during operation. The feature
will cause a delay between cycles by forcing the system to wait a pre set period (seconds) before responding to a
demand signal.
SERVICE INTERVAL
SERVICE HISTORY
FAULT HISTORY
TANK DRAIN
TANK PRE-CLEAN
BURNERS
SHORT CYCLE DELAY

SHORT CYCLE DELAY

SECONDS XX

CHANGE VALUE

The delay can be set from 1 to 1000 seconds. The default shall be 1 second since any larger value can result in a
less dynamic response of the system as a whole. This feature should only be used once a short cycle condition has
been identified.

- 54 -

User Settings
DATE/TIME/UNITS
LANGUAGE CONTROLS
WATER MANAGEMENT
CONTROL TYPE
CAPACITY LIMIT
CALIBRATE
When a parameter requires a change, press the two arrow keys and enter the password (0335). As long as you
remain in this section, you will not need to enter the password more than once.

Date / Time Units
This field is used for modifying the Date, time and the units of measurement. The date and time are important
parameters when features such as full tank blowdown are enabled.

CHANGE TIME
0335

DATE/TIME/UNITS
LANGUAGE CONTROLS
WATER MANAGEMENT
CONTROL TYPE
CAPACITY LIMIT
CALIBRATE

TIME

HH:MM

DATE

MM.DD.YY

UNITS:

LB/HR

XX:XX

CHANGE DATE
0335

MM.DD.YY

SELECT UNITS
0335

LB/HR
KG/HR

Time (of day)
To set the time of day, highlight the selection then enter the user code (0335). Press enter. Use the UP/DOWN
arrows to adjust the hours (24 hour format). Pressing enter saves the setting and indexes the display to minutes. Use
the UP/DOWN arrows to adjust the minutes. Pressing enter saves the setting and returns the user to the previous
menu.

Date
To set the date, highlight the selection then enter the user code (0335). Press enter. Use the UP/DOWN arrows to
select the month. Pressing enter saves the setting and indexes the display to number of the month. Use the
UP/DOWN arrows to adjust the number. Pressing enter saves the setting and indexes the display to year. Use the
UP/DOWN arrows to adjust the year. Pressing enter saves the setting and returns the user to the previous menu.

Units
Here the user can select the unit of steam production rate. To set the units, highlight the selection then enter the
user code (0335). Press enter. Use the UP/DOWN arrows to select the units (LB/HR or KG/HR). Pressing enter saves
the setting and returns the user to the previous menu.
- 55 -

Language Controls
DATE/TIME/UNITS
LANGUAGE CONTROLS
WATER MANAGEMENT
CONTROL TYPE
CAPACITY LIMIT
CALIBRATE

SELECT LANGUAGE
ENGLISH
FRENCH
GERMAN

This field allows the user to select the menu language of choice (English, French, German)
Here the user can select the language of choice for the menu displays. To set the language, highlight the
selection then enter the user code (0335). Press enter. Use the UP/DOWN arrows to select the choice (English,
French, German). Pressing enter saves the setting and returns the user to the previous menu.
DATE/TIME/UNITS
LANGUAGE CONTROLS
WATER MANAGEMENT
CONTROL TYPE
CAPACITY LIMIT
CALIBRATE

FTBD HOURS
XXX
FTBD HOUR
XX
BLOWDOWN RATE XX%
FLOAT CHECK
HH:MM
FILL CORRCTN
XX%
DRAIN CORRCTN XX%
DRAIN COOL:
SMART

FTBD HOURS
0335

CHANGE HOURS? XXX

NOTE: ONLY ENGLISH AVAILABLE AS OF 05/03

Water Management
This section allows the user to set time based parameters and adjust water control parameters.

FTBD Hours
This section allows the user to set the frequency of full tank blowdowns (FTBD). FTBD’s drains and re-fills the
entire contents of the humidifier after a preset accumulated operating time. Run time is measured in steam hours
(weighted run time hours), and can be adjusted from 0 hours (feature off) to 400 hours in 25 hour increments.
Once the FTBD time has expired, the controller will wait until the FTBD hour to initiate the cycle. This prevents
random drains at times when they would be inconvenient.

DATE/TIME/UNITS
LANGUAGE CONTROLS
WATER MANAGEMENT
CONTROL TYPE
CAPACITY LIMIT
CALIBRATE

FTBD HOURS
FTBD HOUR
BLOWDOWN RATE
FLOAT CHECK
FILL CORRCTN
DRAIN CORRCTN
DRAIN COOL:

- 56 -

XXX
XX
XX%
HH:MM
XX%
XX%
ON

FTBD HOUR
0335

CHANGE HOUR? XXX

FTBD Hour
Works in conjunction with FTBD hours.
DATE/TIME/UNITS
LANGUAGE CONTROLS
WATER MANAGEMENT
CONTROL TYPE
CAPACITY LIMIT
CALIBRATE

FTBD HOURS
FTBD HOUR
BLOWDOWN RATE
FLOAT CHECK
FILL CORRCTN
DRAIN CORRCTN
DRAIN COOL:

XXX
XX
XX%
HH:MM
XX%
XX%
ON

0335

BLOWDOWN RATE
CHANGE VALUE XX%
STEAM OUTPUT

Here the user sets the time of day (24 hour format) when they want the FTBD to execute. The time can be set to
trigger the cycle during off hours, when the humidity requirements are minimal.
The time is adjusted in one-hour increments.

Blowdown Rate
This parameter adjusts the frequency of blowdown cycles.
DATE/TIME/UNITS
LANGUAGE CONTROLS
WATER MANAGEMENT
CONTROL TYPE
CAPACITY LIMIT
CALIBRATE

FTBD HOURS
FTBD HOUR
BLOWDOWN RATE
FLOAT CHECK
FILL CORRCTN
DRAIN CORRCTN
DRAIN COOL:

XXX
XX
XX%
HH:MM
XX%
XX%
ON

FLOAT CHECK
CHANGE VALUE HH:MM
0335

Depending on water quality, the blowdown rate can be adjusted from 5% to 50%. The percentage is based on the
steam production rate i.e. a 10% BD rate will drain 10 kg. of water for every 100 kg. of steam produced.
The higher the mineral content of the water the higher the BD rate should be set.

Float Check
This parameter sets the time of day the controller will force a float check.
Float checks are important to ensure the water level detection system is operating correctly. The float check also
tests the fill and drain system and will report any problems detected.
To set the time of day, highlight the selection then enter the user code (0335). Press enter. Use the UP/DOWN
arrows to adjust the hours (24 hour format). Pressing enter saves the setting and indexes the display to minutes. Use
the UP/DOWN arrows to adjust the minutes. Pressing enter saves the setting and returns the user to the previous
menu.

DATE/TIME/UNITS
LANGUAGE CONTROLS
WATER MANAGEMENT
CONTROL TYPE
CAPACITY LIMIT
CALIBRATE

FTBD HOURS
FTBD HOUR
BLOWDOWN RATE
FLOAT CHECK
FILL CORRCTN
DRAIN CORRCTN
DRAIN COOL:

XXX
XX
XX%
HH:MM
XX%
XX%
ON

- 57-

0335

DRAIN COOL:
ON
OFF
SMART

Fill CORRCTN (correction)
Used for adjusting the fill rate. Adjustments to be made under factory direction only.

Drain CORRCTN (correction)
Used for adjusting the drain rate. Adjustments to be made under factory direction only.

Drain Cool
The customer can select the type of drain water tempering they require (depending on local plumbing codes)
The customer can select ON, OFF, or SMART.
ON – whenever the drain valve is activated through software, the fill valve will automatically activate. This is the
factory default setting, but is the most wasteful of water since it will activate even if the drain water is cool.
OFF – The drain water is never tempered. This can be used where plumbing codes permit. Some process waters
are very expensive, so the customer may choose to temper the drain water through other means.
SMART – The humidifier has a tank sensor that communicates the water temperature to the controller. If the
water is hot during drain cycles the fill valve will be activated. This is the most “water smart” of the settings.

DATE/TIME/UNITS
LANGUAGE CONTROLS
WATER MANAGEMENT
CONTROL TYPE
CAPACITY LIMIT
CALIBRATE

CONTROL TYPE
CONTROL INPUT
TRANSDUCER INPUT
0335

CONTROL TYPE
CONTROL INPUT
TRANSDUCER INPUT

Control Input
This section is used for configuring the controller for a controller input or a transducer input.
To select control input, highlight the selection then enter the user code (0335). Press enter. Use the UP/DOWN
arrows to select control input.
The controllers dip switches then determine the type (0-10 Vdc, 0-20 mA, etc.) of control signal to process.

- 58 -

Transducer Input
This section is used to configure the controller for transducer signals
In this section you can adjust the proportional, integral and derivative constants. There is also a PID learn
algorithm which will tune the various PID constants for optimal performance.

Capacity Limit
In this section the customer can adjust the maximum output of the humidifier between 25-100%.
To adjust the maximum capacity, highlight the selection then enter the user code (0335). Press enter. Use the
UP/DOWN arrows to adjust the output between 25 and 100%.

DATE/TIME/UNITS
LANGUAGE CONTROLS
WATER MANAGEMENT
CONTROL TYPE
CAPCITY LIMIT
CALIBRATE

SET MAXIMUM
CAPACITY XXX%

SET MAXIMUM
CAPACITY XXX%
0335

Calibrate
This selection is used to fine-tune the operating range of the controller. Some modulation signals are not precisely
as stated e.g. a 0-10 controller could actually modulate over a 0-11 volt range.
This selection should only be used by factory-trained individuals.

- 59 -

FAULT LIST
GSTC fault
displayed

GSP fault code
displayed

Description of fault

FAULT
NO BURNERS
AVAILIBLE

NBF

Once the GS controller detects an ignition
module fail, it will index to the next available
ignition module. If all ignition modules have
failed or there are none available (in the case of
a 100 unit) this fault will be generated

-Check red LED’s on all modules for
flashing fault code
-Ensure there is gas supply to the
humidifier
-Ensure that the burners have not been
disabled in the software
-Consult factory

FAULT
AIR PROVING
SWITCH X OPEN
WITH
BLOWERS ACTIVE

AOF-X

On startup after 3 tries if the AP switch does
not close within the proving period, this fault
will be generated

FAULT
AIR PROVING
SWITCH X
CLOSED WITH
BLOWERS
INACTIVE

ACF-X

On initial startup if any of the A/P switches are
closed this fault will be generated.

-Check that blue hoses on the Air
Proving switch have not come loose.
-Check that wires on the Air Proving
switch are on the N/O contacts
-If available, swap Air Proving switch
with another and see if the fault follows
the air proving switch, if so, replace
switch
-Consult factory
-Ensure that wiring on the air proving
switch is on the N/O contacts
-Ensure that there is no continuity
between the switch with the wires off,
if so replace switch
-Ensure that there is not a strong
positive pressure in the room holding
the switch closed
-Consult factory

FAULT
BLOWER X
RPM HIGH

BHF-X

If the blower RPM is above the RPM tolerance
for more than 10 seconds, this fault is
generated and the humidifier stops.

FAULT
BLOWER X
RPM LOW

BLF-X

If the blower RPM is below the RPM tolerance
for more than 10 seconds, this fault is
generated and the humidifier stops

FAULT
BLOWER X
NOT OPERATIONAL

BNF-X

On startup, if the blower RPM does not exceed
500 RPM within 5 seconds or if during
operation, the RPM drops below 500 RPM for
more than 5 seconds this fault is generated

FAULT
ILLEGAL GAS
VALVE
BURNER X

GVF-X

If the controller detects that a gas valve has
activated at a time it should not this fault is
Generated.

- 60 -

Troubleshooting

-Check wiring to lead blower and
ensure a good connection.
-Check lead blower for any restrictions
by testing it in the diagnostics screen.
-Consult factory
-Check wiring to blower X and ensure
a good connection.
-Check blower X for any restrictions by
testing it in the diagnostics screen.
-Consult factory
-Ensure there is power to the blower
and that all wires are making a proper
connection.
-Consult factory
-Ensure that the ignition module is not
miswired or that the module is not
faulty by swapping it with a known
good one. If the problem follows the
ignition module, replace the module
-Consult factory

FAULT LIST
FAULT
GAS RE-IGNITION
BURNER X

GIF-X

Following an ignition module fault if the
modules gas valve activates this fault will be
generated.

FAULT
DRAIN NOT
WORKING
DRAIN IS BLOCKED

DBF

There are many time windows in the GS
software. If, during a drain cycle, the time
window for the water level to drop is exceeded,
this fault is generated

FAULT
FLOAT CHECK

FCF

Once every 24 hours (provided the unit is
powered and in an operating or standby
condition) the controller will test the water
level detection circuit. If the test fails this fault
is displayed

-Ensure the proper operation of the fill
valve and drain valve via the
diagnostics screen
-Float board is defective
-Consult factory

FAULT
ILLEGAL FLOAT
COMBINATION

WLF

-Miswired float board
-Defective float board
-Consult factory

FAULT
FILL VAVLE ON
DETECTION
INCONSISTENT

FDF

If the controller detects two or more float level
readings, which are not expected (ex. Switch 1
and 3 ON or switch 1, 2, and 3 ON) this fault
will be recorded.
The controller monitors the water level as it
fills and drains. It expects to see the levels
increase logically (1-2-3-4-5). If the water level
increases and jumps a step (1-2-4-5) this fault
will be generated. The same holds for water
level decreasing.

FAULT
KEEP WARM TIME
OUT
TOO LONG TO
HEAT
FAULT
STACK OVER
TEMP.
SWITCH TRIPPED

KWF

During a keep warn cycle, if the tank
temperature sensor does not open within a
certain time window, this fault is generated.

-Ensure that the tank temperature
sensor is connected
-Defective tank temperature switch
-Contact agent for replacement switch.

OTF

If input TB5, # 4 on the logic board goes low
(no 24 Vac detected) this fault will be
generated. This could indicate either the tank
over temperature switch has opened or the
stack over temperature switch has opened.

-Do not operate and consult the factory

FAULT
MAINTENANCE
TIME
HAS ELAPSED

HMF

FAULT
WATER FILL FAIL

FTF

In the user menu the user sets the maintenance
time. Once this time expires a warning is
displayed. 72 hours later the warning changes
to this fault. The maintenance time is measured
in weighted operational hours.
With switch 5, #4 deactivated, this fault is
enabled
Fill time-out fault during fill process. The GS
software monitors the changes in water level
during filling sequence. If ware level changes
do not occur within an expected time interval,
this fault will be generated.

- 61 -

-Ensure that the ignition module is not
miswired or that the module is not
faulty by swapping it with a known
good one. If the problem follows the
ignition module, replace the module
-Consult factory
-Ensure that pump is being energized
-Check for blockage in all aspects of
the drain system
-Float board defective
-Consult factory

-Float board defective
-Contact agent for replacement float
board

-Perform tank cleaning and all other
maintenance requirements outlined in
the manual.

-Verify water supply is open
-Verify adequate water supply to unit
(30-80psi, 10L/min, minimum ½” dia.
Line size)
-Verify wire harness and connection
between float chamber and I/O board
(TB)

WARNING LIST
GSTC Warning
displayed

GSP warning
displayed

Description of warning:

WARNING
IGNITION MODULE X
FAIL

IMW-X

Once the controller activates an ignition module, it will
allow 4 minutes for the gas valve to activate. After the trial
period, if the gas valve has not activated, a fault will be
generated. The module will be locked out and the next
burner will be indexed.

SEE FAULT LIST

WARNING
AIR PROVING SWITCH X
OPEN WITH
BLOWERS ACTIVE

APW-X

Should the air proving switch open while the unit is
operating this warning is generated. The controller shuts
down and retries. There are no limits to the amount of times
this warning is generated.

SEE FAULT LIST

WARNING
AIR PROVING SWITCH X
OPEN WITH
BLOWERS ACTIVE
WARNING
BLOWER X
RPM HIGH

AOW-X

On startup if the AP switch does not close within the proving
period. After 3 tries, a fault will be generated.

SEE FAULT LIST

BHW-X

If a blower RPM is above the RPM tolerance limit this
warning is generated. If it is above the RPM tolerance limit
for more than 10 seconds a fault will be generated.

SEE FAULT LIST

WARNING
BLOWER X
RPM LOW

BLW-X

If a blower RPM is below the RPM tolerance limit this
warning is generated. If it is below the RPM tolerance limit
for more than 10 seconds a fault will be generated.

SEE FAULT LIST

WARNING
MAINTENANCE TIME
HAS ELAPSED

HMW

In the user menu the user sets the maintenance time. Once
this time expires this warning is displayed. The maintenance
time is measured in weighted operational hours.
With switch 5, #4 activated, this warning will remain until
the warning is reset in the User level

SEE FAULT LIST

WARNING
Too LONG TO FILL

UNW-6

Low water level has not been reached within expected time
interval during initial fill sequence. Unit will continue filling
while warning is displayed. A Water Fill Fail fault will be
generated if the low water level is not reached after an
additional length of time.

SEE FAULT LIST

WARNING
KEEP WARM ACTIVE
SYSTEM DEMAND
ACTIVATED AT 75%

UNW-C

Keep warm feature has initiated combustion sequence at
75% output. This occurs when keep warm feature has been
activated via dip-switch settings, the system demand is
below minimum and the tank temperature sensor is
registering cold (open contacts).

-Warning message
will stop being
displayed once tank
temperature sensor
indicates water is
warm
-Keep warm feature
can be disabled using
dip-switch settings

- 62 -

Troubleshooting

- 63 -

GS Series Internal Components Spare Parts
Number

Description

Part #

GS 100

GS 200

GS 300

GS 400

GS 500

GS 600

101

Cover Plate, Clean-Out Port

2523457

102

Gasket, Tank Cover Plate

2524361

103

Secondary Safety Switch

1504832

104

Fill Box

2526152

105

Vacuum Break Valve ½” npt

1505959

106

P-Trap

2526521

107

Dual Fill Valve 10.0 l/min & 0.35 l/min

1505759

108

Heat Exchanger Gasket
Single

2524405

Dual

2524403

GS 100

1506140

GS 200

1506141

GS 300/400

1506142

GS 500/600

1506143

109

110

Direct Vent Air Manifold

Heat Exchanger Replacement Kit

111

Stack High Limit Switch

112

Exhaust Manifold Gasket

113

Mini

2528422

Single

2528423

Dual

2528424

1
1

1506745

Single

1505973

Dual

1505942

GS 100

1505875

GS 200

1505861

GS 300/400

1505843

GS 500/600

1505828

1
1

Exhaust Manifold
1
1

114

Flexible Gas Hose with fittings

1505960

115

Auxillary Drain Plug

1507043

116

Auxillary Drain Termination

1506925

117

Drain Pump 24v 60 hz

1502644

118

Tank Thermal Sensor

1506026

119

Float Chamber

1115933

120

Float Chamber Mounting Bracket

1113777

121

Float Board

2521137

122

Lower Mixing Box

1506749

123

Replacement Burner Ass’y
110-120V Models

2528416

208-240V Models

1507669

124

Burner Plate Gasket

1505936

125

Sight Port Replacement Kit

2528417

- 64 -

GS Series Internal Components Spare Parts - continued
Number

Description

Part #

GS 100

GS 200

GS 300

GS 400

GS 500

GS 600

1506892

110-120V Models

2528418

208-240V Models

1507695

1507694

110-120V Models

2528420

208-240V Models

1507712

110-120V Models

2524360

208-240V Models

1502289

1504175

Natural Gas

1507713

Propane

1507714

126

Igniter / flame sensor gasket

127

Hot Surface Igniter Replacement kit

128

Flame Sensor Replacement Kit
Igniter / flame Sensor Replacement Kit

129

Combustion Blower

130

Air Proving Switch

131

Gas Valve Assembly

132

Elbow Assembly for Air Intake

1504204

133

Burner / Blower Gasket

1708208

Not
Bracket, Fan Board Mount
Shown

1505899

Not
Fan Board
Shown

1505689

Not
Igniter Jump Start Module
Shown

1506793

Not
Hose Replacement Kit
Shown

1507696

Not
Flexible hose for Direct Vent
Shown

1502148

Not
¼” Tube for Air Proving (per inch)
Shown

1605227

- 65 -

Order (by foot) as Required

- 66 -

GS Series Indoor Cabinetry Spare Parts
Number
201

Description

Part #

GS 100

Mini

2524439

Single

2524440

Double

2524441

Triple

2524458

GS 200

GS 300

GS 400

GS 500

GS 600

Service Door Assembly

202

Fron t Door Assembly

2528421

203

Recessed Handle

2523444

204

Transformer 24/16V 15VA 50/60 hz

1505760

205

Logic Control Board

1505762

206

I/O Board

1504760

207

Primary Transformer
110-120 V Models

1504859

208-240V Models

15067619

Fuse for Primary transformer, 6.25 AMP

1505020

110-120V Models

2525914

208-240V Models

1505987

208

Ignition Control Module

209

Relay Mount Socket

1703250

210

Blower Relay

1453020

Not
Slotted wire duct
Shown

1506041

Order by Length Required

211a

LCD Display Assembly

1507741

211b

LCD Mounting Bracket

1506951

211c

On/Off Drain Switch

1453001

- 67 -

- 68 -

20
19

GS Series Outdoor Cabinetry
Exploded View

GS Outdoor Spare Parts List
1
2
3a
3b
3c
4
5
6
7
8
9
10
11
12
13
14
15

17
18

Description
Transformer 24/16V 15VA
Transformer 208-24Vac 250VA
Fuse 6.25 Amp for 208V transformer
LCD Display Assembly
LCD Mounting Bracket
On-Off-Drain Switch
Logic Control Board
I/O Board
Ignition Control Module
Slotted wire duct
Relay Mount Socket
Blower Relay
Thermostat, On/Off, 80F
Electrical Cabinet
Front Panel
Access Door, Electronics
Access Door, Tank
Left Panel
Mini
Single
Double
Triple
Top Cap Assembly
Mini
Single
Double
Triple
Display Bracket Holder
Female to Female Coupling
3" Dia.
4" Dia
5" Dia
6" dia
Vent Pipe, 24" Long
3" Dia
4" Dia
5" Dia
6" dia
Chimney Flashing,
for 3" vent pipe
for 4" vent pipe
for 5" vent pipe
for 6" vent pipe
Storm Collar,
for 3" vent pipe
for 4" vent pipe
for 5" vent pipe
for 6" vent pipe
Vent Pipe, 12" Long
3" Dia
4" Dia
5" Dia
6" dia
Rain Cap
Mini
Single
Double
Triple
Cooling Fan

Part #
1505760
1506719
1505020
1507741
1506951
1453001
1505762
1504760
1505987
1506041
1703250
1453020
1508042
1506989
1507783
1507801
1507800
1508096
1508095
1507861
1507804
1508100
1508099
1507863
1507806
1506950
1508136
1508135
1507886
1507880
1508132
1508131
1507888
1507882
1508138
1508137
1507885
1508150
1508140
1508139
1507890
1507884
1508134
1508133
1507884
1507881
1508130
1508129
1507889
1507883
1507891

GS 100 GS 200 GS 300 GS 400 GS 500 GS 600
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
3
4
5
6
order by length required
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1

- 69 -

25 Fan Hood
26 Cover Plate Top Panel
27 Gasket, Steamline

29
30
31

32
33
34
35

36
37
38

100
200/300
400/500/600
Cover Plate Steam Line
100
200/300
400/500/600
Step-up transformer (120/240V option)
Mounting bracket, step-up transformer
Mid Cross Member
Mini
Single
Double
Triple
Gas Line Bracket
Rear Frame Element
Rear Panel
Cross Member
Mini
Single
Double
Triple
Mounting bracket, float chamber
Front Frame
Right Panel
Mini
Single
Double
Triple
Access Door, Side

40 Base Assembly

Mini
Single
Double
Triple

41 Lifting Lug
42 Pump House Heater 500 watts
43 Mounting Bar Pump House Heater, Mini
Single
Double
Triple
44 Strapping, Pump House Heater

1507811
1508109
1508105
1507872
1507871
1508106
1507870
1507810
1508167
1507759
1506958
1506978
1506983
1506972
1506960
1506963
1507785
1506957
1506979
1506981
1506971
1508114
1506959
1508087
1508097
1507862
1507803
1507801
1507800
1507860
1508123
1508122
1508017
1508018
1507901
1508039
1508113
1508112
1508111
1508164
1508110

1
1
1

1
1

1
1
1

1
2
1
1

2
1
1

1
4
3

2
3

1
1
1

1
1

1
1
1

2
1
1

1
1

1
1
1
2

1
1
1

1
1

4
1
2

4
1

4
2

- 70 -

-71 -

7
36

4
2

1
6

DETAIL B

THE MIDDLE SECTION IS USED ONLY FOR GS300/400 AND GS500/600
(SHOWN THE STAND FOR GS300/400)

2
5

1. UNPACK STAND AND CHECK THAT ALL PIECES ARE PRESENT AND UNDAMAGED.
2. ASSEMBLE STAND TO CONFIGURATION SHOWN ON SHEET 1. HAND TIGHTEN ALL
BOLTS ONLY.
3. HOIST HUMIDIFIER UP ABOVE THE FLOOR A MINIMUM OF 32 IN (812.8 MM).
4. POSITION STAND BELLOW THE LEGS OF THE HUMIDIFIER. ALIGN HUMIDIFIER AND
STAND SO THAT HOLES IN THE HUMIDIFIER BASE ALIGN WITH HOLES IN STAND.
5. LOWER HUMIDIFIER 1/4" ABOVE STAND TO ALIGN WITH NEAREST HOLE.
6. FASTEN STAND TO HUMIDIFIER USING THE BOLTS, LOCKWASHERS AND NUTS
PROVIDED.
7. TIGHTEN NUT AND BOLT PAIRS TO 200 IN-LB ((2.3 Kg-m) OR UNTILL SECURE.
8. LOWER ENTIRE ASSEMBLY TO FLOOR AND ENSURE THAT IT IS STABLE.
9. SHIMMING OF THE FLOOR BELLOW THE LEGS OF THE STANDS MAY BE NECESSARY
TO ENSURE BALANCE OF THE HUMIDIIFER.
10. THE STAND MAY BE PERMENANTLY FASTENED TO THE FLOOR VIA THE HOLES IN
THE LEG SUPPORT PLATES.

ASSEMBLY INSTRUCTIONS

3
2

6
36

A - 4.2in (10.6 cm)

A + 2in (5.1 cm)

2525888

REV A

Qty

2
2
36

2
2

4
2
2

PLATE, CARRIER, FLOOR STAND, GS/SE, B STYLE
BRACE, COMMON, FLOOR STAND, GS/SE, B STYLE
BRACE, FLOOR STAND, GS-SE, B STYLE

Nut, 3/8-16 UNC, SST

GS Stand Assembly Instructions
150-7308
06/26/2003

0.5in
O 1.3cm

52.35in (133 cm)

GS500, GS600,
GH2E200, GH2E240

43.1in
109.4cm

21.15in (53.7 cm)
36.7in (93.3 cm)

GS200, GH2E80
GS300, GS400,
GH2E120, GH2E160

DIMENSION A
14.85in (37.7 cm)

UNIT SIZE
GS100, GH2E40

28
28

Lock washer, 0.375

BOLT, 3/8-16UNC X 3/4LG

6
5

GS100 GS200 GS300/400 GS500/600

Description
LEG, FLOOR STAND, GS/SE, B STYLE

FLOOR STAND, ASSEMBLY INSTRUCTIONS, GS/SE

DETAIL A

Item

35.7in
90.7cm

5
36

43.1in
109.4cm
30.2in
76.7cm

GS Quick Reference
Item

GS 100

GS 200

GS 300

GS 400

GS 500

GS 600

Gas Pressure
Natural Gas min "wc/mbar

5/14

Natural Gas max "wc/mbar

9/22

Propane min

10/23

Propane max

14/34

Min free air opening in/cm

13/33

23/58

35/89

47/119

59/150

71/180

140,000

280,000

420,000

560,000

700,000

840,000

Input BTU's
Max
Min GSTC

45,000

Direct vent min

60,000

Gas Piping Size in/cm

1/2/1.3

3/4/1.9

1/2.5

1.25/3.2

"BH" Vent

"B" Vent

3/7.6

4/10.2

5/12.7

6/15.2

4/10.2

5/12.7

7/17.8

8/20.3

I or III

Full Weight In lbs./kg

416/188

588/266

954/432

974/441

1340/607

1360616

Empty Weight In lbs./kg

266/120

354/160

485/217

529/239

659/298

703/318

"BH" Exhaust Piping in/cm

Appliance Category

0335

User level password
Water consumption (25% bd)
Gallons/litres

433/1639

866/3278

1300/4921

1733/6560

2166/8199

2600/9842

18/71

29/111

58/221

55/210

84/320

81/309

Tank Water Volume
Gallons/litres
Fill valve flow rates
2.64/10

To tank: Gallons/litres

0.09/0.35

To float chamber: Gallons/litres
Supply water pressure
Min. psi/kpa

30/206

Max. psi/kpa

80/551

Drain rate (includes D.W.C)
Gallons/Litres per minute

5.2/20

Min drain pipe size in/cm

1 to 1.5 / 2.5 to 3.8 OD or larger

Power supply requirements
Transformer Required

120 volts a/c
208-240 volts a/c 1PH
Steam Outlet size in/cm

1.75/4.4

3/7.6

4/10.2

- 72 -

LIMITED WARRANTY
Walter Meier Inc. and/or Walter Meier Ltd. (hereinafter collectively referred to as THE COMPANY),
warrant for a period of two years from date of shipment, that THE COMPANY's manufactured and
assembled products, not otherwise expressly warranted, 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 Walter Meier’s 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 retains the right to change the design, specification and performance criteria of its
products without notice or obligation.

826 Proctor Avenue, Ogdensburg, New York 13669
Walter Meier (Climate Canada) Ltd.
2740 Fenton Road, Ottawa, Ontario K1T3T7
Tel: 866 NORTEC 1

Fax: 613 822 7964

northamerica.climate@waltermeier.com

www.humidity.com

PRINTED IN CANADA

Walter Meier (Climate USA) Inc.

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