Trane Gas Unit Heaters Installation And Maintenance Manual GHND SVX01C EN 03/16/2012 Installation, Operation, Heater High Efficiency Propeller Fan S GH

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SAFETY WARNING

Only qualified personnel should install and service the equipment. The installation, starting up, and

servicing of heating, ventilating, and air-conditioning equipment can be hazardous and requires specific

knowledge and training. Improperly installed, adjusted or altered equipment by an unqualified person could

result in death or serious injury. When working on the equipment, observe all precautions in the literature

and on the tags, stickers, and labels that are attached to the equipment.

Gas Unit Heater

High Efficiency Propeller Fan

March 2012 GHND-SVX01C-EN

Installation, Operation,

and Maintenance

© 2012 Trane All rights reserved GHND-SVX01C-EN

Warnings, Cautions and Notices

Warnings, Cautions and Notices. Note that warnings,

cautions and notices appear at appropriate intervals

throughout this manual. Warnings are provide to alert

installing contractors to potential hazards that could result

in death or personal injury. Cautions are designed to alert

personnel to hazardous situations that could result in

personal injury, while notices indicate a situation that

could result in equipment or property-damage-only

accidents.

Your personal safety and the proper operation of this

machine depend upon the strict observance of these

precautions.

Read this manual thoroughly before operating or servicing

this unit.

Important

Environmental Concerns!

Scientific research has shown that certain man-made

chemicals can affect the earth’s naturally occurring

stratospheric ozone layer when released to the

atmosphere. In particular, several of the identified

chemicals that may affect the ozone layer are refrigerants

that contain Chlorine, Fluorine and Carbon (CFCs) and

those containing Hydrogen, Chlorine, Fluorine and

Carbon (HCFCs). Not all refrigerants containing these

compounds have the same potential impact to the

environment. Trane advocates the responsible handling of

all refrigerants-including industry replacements for CFCs

such as HCFCs and HFCs.

Responsible Refrigerant Practices!

Trane believes that responsible refrigerant practices are

important to the environment, our customers, and the air

conditioning industry. All technicians who handle

refrigerants must be certified. The Federal Clean Air Act

(Section 608) sets forth the requirements for handling,

reclaiming, recovering and recycling of certain

refrigerants and the equipment that is used in these

service procedures. In addition, some states or

municipalities may have additional requirements that

must also be adhered to for responsible management of

refrigerants. Know the applicable laws and follow them.

ATTENTION: READ THIS MANUAL AND ALL LABELS

ATTACHED TO THE UNIT CAREFULLY BEFORE

ATTEMPTING TO INSTALL, OPERATE OR SERVICE THESE

UNITS! CHECK UNIT DATA PLATE FOR TYPE OF GAS AND

ELECTRICAL SPECIFICATIONS AND MAKE CERTAIN THAT

THESE AGREE WITH THOSE AT POINT OF INSTALLATION.

RECORD THE UNIT MODEL AND SERIAL No.(s) IN THE

SPACE PROVIDED. RETAIN FOR FUTURE REFERENCE.

ATTE NT ION : Warnings, Cautions and Notices appear at

appropriate sections throughout this literature. Read

these carefully:

WARNING Indicates a potentially hazardous

situation which, if not avoided, could

result in death or serious injury.

CAUTIONsIndicates a potentially hazardous

situation which, if not avoided, could

result in minor or moderate injury. It

could also be used to alert against

unsafe practices.

NOTICE: Indicates a situation that could result in

equipment or property-damage only

WARNING

Proper Field Wiring and Grounding

Required!

All field wiring MUST be performed by qualified

personnel. Improperly installed and grounded field

wiring poses FIRE and ELECTROCUTION hazards. To

avoid these hazards, you MUST follow requirements for

field wiring installation and grounding as described in

NEC and your local/state electrical codes. Failure to

follow code could result in death or serious injury.

WARNING

Personal Protective Equipment (PPE)

Required!

Installing/servicing this unit could result in exposure to

electrical, mechanical and chemical hazards.

• Before installing/servicing this unit, technicians

MUST put on all Personal Protective Equipment (PPE)

recommended for the work being undertaken.

ALWAYS refer to appropriate MSDS sheets and OSHA

guidelines for proper PPE.

• When working with or around hazardous chemicals,

ALWAYS refer to the appropriate MSDS sheets and

OSHA guidelines for information on allowable

personal exposure levels, proper respiratory

protection and handling recommendations.

• If there is a risk of arc or flash, technicians MUST put

on all Personal Protective Equipment (PPE) in

accordance with NFPA 70E or other country-specific

requirements for arc flash protection, PRIOR to

servicing the unit.

Failure to follow recommendations could result in death

or serious injury.

Warnings, Cautions and Notices

GHND-SVX01C-EN 3

Trademarks

Trane and the Trane logo are trademarks of Trane in the

United States and other countries. All trademarks

referenced in this document are the trademarks of their

respective owners.

Dow Corning is a registered trademark of Dow Corning

Corporation.

WARNING

Hazardous Service Procedures!

The maintenance and troubleshooting procedures

recommended in this manual could result in exposure

to electrical, mechanical or other potential safety

hazards. Always refer to the safety warnings provided

throughout this manual concerning these procedures.

When possible, disconnect all electrical power

including remote disconnect and discharge all energy

storing devices such as capacitors before servicing.

Follow proper lockout/tagout procedures to ensure the

power can not be inadvertently energized. When

necessary to work with live electrical components,

have a qualified licensed electrician or other individual

who has been trained in handling live electrical

components perform these tasks. Failure to follow all of

the recommended safety warnings provided, could

result in death or serious injury.

WARNING

Overheating or Flooding Could Cause Fire

or Explosion!

Overheating or flooding (where any part of the unit

heater has been under water) could result in fire or

explosion. Should overheating occur, or the gas supply

fails to shut off, shut off the manual gas valve to the

unit heater before shutting off the electrical supply. Do

not use the unit heater if any part has been under

water. Immediately call a qualified service technician to

inspect the unit heater and replace any gas control

which has been underwater. Failure to follow these

recommendations could result in death or serious

injury.

WARNING

Hazardous Gases and Flammable

Vapors!

Exposure to hazardous gases from fuel substances

have been shown to cause cancer, birth defects or

other reproductive harm. Improper installation,

adjustment, alteration, service or use of this product

could cause flammable mixtures. To avoid hazardous

gases and flammable vapors follow proper

installation and set up of this product and all

warnings as provided in this manual. Failure to follow

all instructions could result in death or serious injury.

4GHND-SVX01C-EN

Introduction

For Your Safety

The use and storage of gasoline or other flammable

vapors and liquids in open containers in the vicinity

of this appliance is hazardous.

If you smell gas:

1. Open windows.

2. Do not touch electrical switches.

3. Extinguish any open flame.

4. Immediately call your gas supplier from a

neighbor’s phone. Follow the gas supplier’s

instructions.

Approved For Use in California

Installer’s Responsibility

Installer Please Note: This equipment has been test fired

and inspected. It has been shipped free from defects from

our factory. However, during shipment and installation,

problems such as loose wires, leaks, or loose fasteners

may occur. It is the installer’s responsibility to inspect and

correct any problems that may be found.

Receiving Instructions

Inspect shipment immediately when received to

determine if any damage has occurred to the unit during

shipment. After the unit has been uncrated, check for any

visible damage to the unit. If any damage is found, the

consignee should sign the bill of lading indicating such

damage and immediately file claim for damage with the

transportation company.

Important: It is the equipment owner’s responsibility to

provide any scaffolding or other apparatus

required to perform emergency service or

annual/periodic maintenance to this

equipment.

WARNING

Safety Alert!

You MUST follow all recommendations below. Failure

to do so could result in death or serious injury.

WARNING

Toxic Hazard!

Install, operate and maintain unit in accordance with

manufacturer’s instructions to avoid exposure to fuel

substances or substances from incomplete combustion

which could result in death or serious illness. The state

of California has determined that these substances may

cause cancer, birth defects, or other reproductive harm.

Table of Contents

GHND-SVX01C-EN 5

Warnings, Cautions and Notices . . . . . . . . . . 2

Model Number Descriptions . . . . . . . . . . . . . . 6

Indoor Gas Heating Units . . . . . . . . . . . . . . . 6

General Information . . . . . . . . . . . . . . . . . . . . . 7

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

General Safety Information . . . . . . . . . . . . . 7

Identification of Parts . . . . . . . . . . . . . . . . . . 8

Unit Dimensions and Weights . . . . . . . . . . . 10

Installation: Mechanical . . . . . . . . . . . . . . . . . 12

Air Distribution . . . . . . . . . . . . . . . . . . . . . 12

Clearances . . . . . . . . . . . . . . . . . . . . . . . . . 13

Nozzle Assembly . . . . . . . . . . . . . . . . . . . 14

Installation: Piping . . . . . . . . . . . . . . . . . . . . . . 16

Gas Supply Piping . . . . . . . . . . . . . . . . . . . . 16

Pipe Sizing . . . . . . . . . . . . . . . . . . . . . . . . 16

Pipe Installation . . . . . . . . . . . . . . . . . . . . . . 17

Installation: Venting . . . . . . . . . . . . . . . . . . . 18

Venting for Power Vented (Category III) Unit

Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Installation: Electrical . . . . . . . . . . . . . . . . . . . 24

Electrical Connections . . . . . . . . . . . . . . . . . 24

Thermostat Wiring and Location . . . . . . 24

Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Power Vented Propeller Units with Intermit-

tent (Spark) Pilot Ignition . . . . . . . . . . . . . 27

Gas Equipment Start-Up . . . . . . . . . . . . . . . 32

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Periodic Service . . . . . . . . . . . . . . . . . . . . 33

Installation Instructions for Field Replace-

ment of Power Venter Motor . . . . . . . . . . 36

How to Order Replacement Parts . . . . . . 37

Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . 38

Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . 42

6 GHND-SVX01C-EN

Model Number Descriptions

Indoor Gas Heating

Units

Note: All units are AGA approved. For

CGA approved units, contact Air

Handling Product Support.

Digit 1 — Gas Heating

Equipment

G = Gas Heating Equipment

Digit 2 — Product Type

H = High Efficiency Propeller Fan

Unit Heater

Digit 3 — Fuel

N= Natural Gas

P=LP Gas (Propane)

Digit 4 — Development

Sequence

D = Fourth Generation

Digits 5, 6, 7 — Input Capacity

Single Furnace

Digit 8 — Main Power Supply

Digit 9 — Gas Control Option

D = Single-Stage, Intermittent Pilot

Ignition

E = Two-Stage, Intermittent Pilot

Ignition

H = Electronic Modulating with

Room

T-Stat, Intermittent Pilot Ignition

J = Electronic Modulating with

Duct-Stat, Intermittent Pilot

Ignition

L = Electronic Modulating with

External 4–20 mA Input

N = Electronic Modulating with

External 0–10 Vdc Input

T = Single Stage Direct Spark

Ignition

V = Two-Stage, Direct Spark Ignition

Digit 10 — Design Sequence

G = Seventh Design

Digit 11 — Heat Exchanger

Material

1 = Aluminized Steel

3 = #321 Stainless Steel

Digit 12 — Rooftop

Arrangements

0 = None (Indoor Unit)

Digit 13 — Rooftop Heating Unit

Motor Selection

0 = None (Indoor Unit and Rooftop

Duct Furnace)

Digit 14 — Rooftop Fan Section

0 = None (Indoor Unit and Rooftop

Duct Furnace)

Digit 15 — Miscellaneous

Options

0=None

A = #409 Stainless Steel Burners

B = Orifices For Elevation Above

2000 Feet (Specify Elevation)

C = #409 Stainless Steel Draft

Diverter

D = Summer-Winter Switch

E = Vertical Louvers

J = Totally Enclosed Motor

7 = OSHA Fan Guard

010 = 100 MBh 022 = 225 MBh

012 = 125 MBh 025 = 250 MBh

015 = 150 MBh 030 = 300 MBh

017 = 175 MBh 035 = 350 MBh

020 = 200 MBh 040 = 400 MBh

A = 115/60/1 D = 230/60/3

B = 230/60/1 E = 460/60/3

C = 208/60/3 F = 575/60/3

GHND-SVX01C-EN 7

General Information

Description

The Power Vented Gas Unit Heater is a factory assembled,

power vented, low static pressure type propeller fan

heater designed to be suspended within the space to be

heated. THESE HEATERS ARE NOT TO BE CONNECTED TO

DUCTWORK. The designs are certified by ETL as providing

a minimum of 80 percent thermal efficiency, and approved

for use in California. Do not alter these units in any

way. If you have any questions after reading this manual,

contact the manufacturer.

General Safety Information

Important: This product must be installed by a licensed

plumber or gas fitter when installed within

the Commonwealth of Massachusetts.

• Installation must be made in accordance with

local codes, or in absence of local codes with the

latest edition of ANSI Standard Z223.1 (N.F.P.A.

No. 54) National Fuel Gas Code.

All of the ANSI and NFPA Standards referred to

in these installation instructions are those that

were applicable at the time the design of this

appliance was certified. The ANSI Standards are

available from the American National Standards

Institute, INC.,11 West 42nd Street, New York,

NY., 10036 or www.ansi.org. The NFPA

Standards are available from the National Fire

Protection Association, Batterymarch Park,

Quincy, MA 02269. These unit heaters are

designed for use in airplane hangars when

installed in accordance with current ANSI/NFPA

No. 409 and in public garages when installed in

accordance with current NFPA No. 88A and

NFPA No. 88B.

If installed in Canada, the installation must

conform with local building codes, or in absence

of local building codes, with CSA-B149.1

“Installation Codes for Natural Gas Burning

Appliances and Equipment” or CSA-B149.2

“Installation Codes for Propane Gas Burning

Appliances and Equipment”. These unit heaters

have been designed and certified to comply with

CSA 2.6. Also see sections on installation in

“Aircraft Hangers,” p. 12 and “Public Garages,”

p. 12.

• Do not alter the unit heater in any way or damage

to the unit and/or severe personal injury or death

could occur!

• Turn off the gas supply and disconnect all

electric power, including remote disconnects

before servicing unit. Follow proper lockout/

tagout procedures to ensure the power can not

be inadvertently energized and the gas can not

be inadvertently turned on. Failure to turn off

gas or disconnect power before servicing could

result in death or serious injury.

• Follow installation instructions CAREFULLY to

avoid creating unsafe conditions. All wiring

Figure 1. Power Vented Propeller Unit Heaters

Front view Rear view

See “Identification of Parts,” p. 8 for unit components.

WARNING

Safety Alert!

You MUST follow all recommendations below. Failure

to do so could result in death or serious injury.

General Information

8 GHND-SVX01C-EN

should be done and checked by a qualified

electrician, using copper wire only. All external

wiring must conform to applicable local codes

and to the latest edition of the National

Electrical Code ANSI/NFPA No. 70. In Canada, all

external wiring must conform to the Canadian

Electric Code, Part 1 CSA Standard C22.1.

• All gas connections should be made and leak-

tested by a suitably qualified individual, per

instructions in this manual. Also follow

procedures listed in “Gas Equipment Start-Up,”

p. 32.

• Use only the fuel for which the unit heater is

designed (see rating plate). Using LP gas in a

heater that requires natural gas, or vice versa,

will create the risk of gas leaks, carbon

monoxide poisoning and explosion.

Important: Do not attempt to convert the heater

for use with a fuel other than the one

intended. Such conversion is

dangerous, as it could create the risks

listed previously.

• Make certain that the power source conforms to

the electrical requirements of the heater.

• All field-installed wiring must be completed by

qualified personnel. All field-installed wiring

must comply with NEC and applicable local

codes. Failure to follow this instruction could

result in death or serious injuries.

• Special attention must be given to any

grounding information pertaining to this heater.

To prevent the risk of electrocution, the heater

must be securely and adequately grounded. This

should be accomplished by connecting a

grounded conductor between the service panel

and the heater. To ensure a proper ground, the

grounding means must be tested by a qualified

electrician.

• Do not insert fingers or foreign objects into the

heater or its air moving device. Do not block or

tamper with the heater in any manner while in

operation or just after it has been turned off, as

some parts may be hot enough to cause injury.

• This heater is intended for general heating

applications ONLY. It must NOT be used in

potentially dangerous locations such as

flammable, explosive, chemical-laden or wet

atmospheres.

• Do not attach ductwork to this product or use it

as a makeup air heater. Such usage voids the

warranty and will create unsafe operation.

• In cases in which property damage may result

from malfunction of the heater, a backup system

or a temperature sensitive alarm should be used.

• When connecting to existing gas lines be sure to

valve off the gas supply ahead of connection

point. To avoid explosion or possible fire, always

purge all residual gas from piping before cutting

into existing line or removing threaded fittings.

Failure to remove all gas vapors could result in

death or serious injury or equipment or property-

only-damage.

Unless otherwise specified, the following conversions

may be used for calculating SI unit measurements:

Identification of Parts

1 foot = 0.305 m 1 inch water column = 0.249 kPa

1 inch = 25.4 mm 1 meter/second = FPM ÷ 196.8

1 psig = 6.894 kPa 1 liter/second = CFM x 0.472

1 pound = 0.453 kg 1000 Btu per hour = 0.293 kW

1 gallon = 3.785 L 1000 Btu/Cu. Ft. = 37.5 MJ/m3

1 cubic foot = 0.028 m3

Figure 2. Propeller parts (115/1/60 motor, fan guard,

fan blade, hardware)

Figure 3. Burner assembly parts

D4430

Fan Guard

Fan Blade

Hardware

Hardware

Motor

ELECTRODE/SENSING

LEAD LOCATION

General Information

GHND-SVX01C-EN 9

Figure 4. Internal furnace components

1. Flue Collector

2. Heat Exchanger

3. Burner Drawer

Figure 5. Component parts (bottom view)

1. Fan/Guard/Motor Assy.

2. “Packaged” Gas Valve

3. Pilot Observation Port

4. Pilot Burner Assembly Parts

5. Burner “Drawer”

6. Flame Carryover

7. Main Burner

8. Junction Box

9. Transformer

1

3

2

1

2

3

4

5

6

7

8

9

10 GHND-SVX01C-EN

Unit Dimensions and Weights

Table 1. Performance and dimensional data: Power Vented Propeller Unit Heater

Unit Size 100 125 150 175 200 225 250 300 350 400

PERFORMANCE DATA(a)

Input BTU/Hr 100,000 125,000 150,000 175,000 200,000 225,000 250,000 300,000 350,000 400,000

(kW) (29.3) (36.6) (43.9) (51.2) (58.6) (65.9) (73.2) (87.8) (102.5) (117.1)

Output BTU/Hr 80,000 100,000 120,000 140,000 160,000 180,000 200,000 240,000 280,000 320,000

(kW) (23.4) (29.3) (35.1) (41.0) (46.9) (52.7) (58.6) (70.3) (82.0) (93.7)

Thermal Efficiency %80808080808080808080

Free Air Delivery CFM cfm 1,480 1,650 2,200 2,530 2,640 2,700 3,100 4,400 5,000 5,300

(m3/s) (0.699) (0.779) (1.038) (1.194) (1.246) (1.274) (1.463) (2.077) (2.360) (2.502)

Air Temperature Rise °F 50 56 50 51 56 61 60 50 52 56

(°C) (28) (31) (28) (28) (31) (34) (33) (28) (29) (31)

Outlet Velocity fpm 775 910 1,045 1,070 1,010 950 980 1,100 1,150 1,050

(m/s) (3.94) (4.62) (5.31) (5.44) (5.13) (4.83) (4.98) (5.59) (5.84) (5.33)

Full Load Amps at 115V 5.2 7.2 7.8 9.2 9.2 9.2 9.2 12.5 15.0 15.0

MOTOR DATA:

Motor hp 1/20 1/10 1/4 1/3 1/3 1/3 1/3 1/4 1/3 1/3

(kW) (0.037) (0.075) (0.186) (0.249) (0.249) (0.249) (0.249) (0.186) (0.249) (0.249)

Type SP SP PSC PSC PSC PSC PSC PSC PSC PSC

RPM 1,050 1,050 1,140 1,140 1,140 1,140 1,140 1,140 1,140 1,140

Amps @ 115V 2.6 4.2 4.7 5.8 5.8 5.8 5.8 9.4 11.6 11.6

DIMENSIONAL DATA

“A” Height to Top of Unit in. 31-1/4 31-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4

(mm) (794) (794) (921) (921) (921) (921) (921) (921) (921) (921)

“B” Width of Unit in. 17-7/8 20-5/8 20-5/8 23-3/8 26-1/8 28-7/8 31-5/8 37-1/8 42-5/8 48-1/8

(mm) (454) (524) (524) (594) (664) (733) (803) (943) (1083) (1222)

“C” Height to Top of Hanger in. 34-1/8 34-1/8 39-1/8 39-1/8 39-1/8 39-1/8 39-1/8 39-1/8 39-1/8 39-1/8

(mm) (867) (867) (994) (994) (994) (994) (994) (994) (994) (994)

“D” Depth to Rear of Housing in. 37-1/2 37-1/2 37-1/2 37-1/2 37-1/2 37-1/2 37-1/2 37-1/2 37-1/2 37-1/2

(mm) (952) (952) (952) (952) (952) (952) (952) (952) (952) (952)

“E” Hanging Distance Width in. 14-1/2 17-1/4 17-1/4 20 22-3/4 25-1/2 28-1/4 33-3/4 39-1/4 44-3/4

(mm) (368) (438) (438) (508) (578) (648) (718) (857) (997) (1137)

“F” Discharge Opening Width in. 15-3/8 18-1/8 18-1/8 20-7/8 23-5/8 26-3/8 29-1/8 34-5/8 40-1/8 45-5/8

(mm) (391) (460) (460) (530) (600) (670) (740) (879) (1019) (1159)

“G” Depth to Unit Side Jacket in. 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4

(mm) (679) (679) (679) (679) (679) (679) (679) (679) (679) (679)

“H” Discharge Opening Heightin.18181818181818181818

(mm) (457) (457) (457) (457) (457) (457) (457) (457) (457) (457)

“J” to Centerline of Flue in. 5-7/8 7-1/4 7-1/4 8-5/8 10 11-1/4 12-3/4 15-1/2 18-1/4 21

(mm) (149) (184) (184) (219) (254) (286) (324) (394) (464) (533)

“K” Depth to Centerline of Fluein. 30-5/8 30-5/8 30-5/8 30-5/8 30-5/8 30-5/8 30-5/8 30-5/8 30-5/8 30-5/8

(mm) (778) (778) (778) (778) (778) (778) (778) (778) (778) (778)

“L” Hanger Location in. 16-1/4 16-3/4 16-3/8 16-3/8 16-3/8 16-3/4 16-3/4 16-3/4 16-3/4 16-3/4

(mm) (413) (425) (416) (416) (416) (425) (425) (425) (425) (425)

Flue Size Dia. in.*4444555666

(mm) (102) (102) (102) (102) (127) (127) (127) (152) (152) (152)

Fan Diameter in.14161618181818(2) 16(2) 18(2) 18

Gas Inlet-Natural Gas in. 100,000 125,000 150,000 175,000 200,000 225,000 250,000 300,000 350,000 400,000

Gas Inlet-LP Gas in. 1/2 1/2 1/2 1/2 1/2 1/2 or 3/4

Approx. Shipping Wt. lb 174 197 219 238 249 275 305 350 414 461

(kg) (79) (89) (99) (108) (113) (125) (138) (159) (188) (209)

Notes:

1. For installations in Canada, any references to deration at altitudes in excess of 2000 ft. (610m) are to be ignored. At altitudes of 2000 to 4500 ft.

(610m to 1372m), the unit must be derated to 90% of the normal altitude rating, and be so marked in accordance with the ETL certification.

2. Legend: SPH = SPLIT PHASE, CAP. START = CAPACITOR START

(a) Ratings shown are for unit installations at elevations between 0 and 2000 ft. (610 m). For unit installations in USA above 2000 ft. (610 m), the unit

input must be derated 4% for each 1000 ft. (305 m) above sea level; refer to local codes, or in absence of local codes, refer to the latest edition of the

National Gas Code, ANSI Standard Z223.1 (N.F.P.A. No. 54).

** Refer to corresponding ** in Figure 6, p. 11.

Unit Dimensions and Weights

GHND-SVX01C-EN 11

Figure 6. Dimensions, standard units

12 GHND-SVX01C-EN

Installation: Mechanical

Since the unit is equipped with an automatic gas ignition

system, the unit heaters must be installed such that the

gas ignition control system is not directly exposed to water

spray, rain, or dripping water.

Note: Location of unit heaters is related directly to the

selection of sizes (refer to Figure 7). Basic rules are

as follows:

Mounting Height. Unit heaters must be installed at a

minimum of 8 feet (2.4 m) above the floor, measured to the

bottom of the unit. At heights above 8 feet (2.4 m), less

efficient air distribution will result. Occasionally unit

heaters must be mounted at heights of 12 to 16 feet (3.7 to

4.9 m) in order to clear obstacles. When this is the case, it

is advisable to use centrifugal blower unit heaters.

Aircraft Hangers. Unit heaters must be installed in

aircraft hangars and public garages as follows: in aircraft

hangars, unit heaters must be at least 10 feet (3.0 m) above

the upper surface of wings or engine enclosures of the

highest aircraft to be stored in the hangar, and 8 feet

(2.4 m) above the floor in shops, offices and other sections

of the hangar where aircraft are not stored or housed.

Refer to current ANSI/NFPA No. 409, Aircraft Hangars. In

Canada, installation is suitable in aircraft hangars when

acceptable to the enforcing authorities.

Public Garages. In repair garages, unit heaters must be

located at least 8 feet (2.4 m) above the floor. Refer to the

latest edition of NFPA 88B, Repair Garages.

In parking structures, unit heaters must be installed so that

the burner flames are located a minimum of 18 inches

(457 mm) above the floor or protected by a partition not

less than 18 inches (457 mm) high. However, any unit

heater mounted in a parking structure less than 8 feet

(2.4 m) above the floor must be equipped with an OSHA

approved fan guard. Refer to the latest edition of

NFPA 88A, Parking Structures.

In Canada, installation must be in accordance with the

latest edition of CSAB149 “Installation Codes for Gas

Burning Appliances and Equipment.”

Air Distribution

Direct air towards areas of maximum heat loss. When

multiple heaters are involved, circulation of air around the

perimeter is recommended where heated air flows along

exposed walls. Satisfactory results can also be obtained

where multiple heaters are located toward the center of

the area with heated air directed toward the outside walls.

Be careful to avoid all obstacles and obstructions which

could impede the warm air distribution patterns. Heat

throw distances are presented in Table 2, p. 12 and

Figure 8.

NOTICE:

Equipment Damage!

Do not install unit heaters in corrosive or flammable

atmospheres! Premature failure of, or severe damage to

the unit could result! Avoid locations where extreme

drafts can affect burner operation. Unit heaters must

not be installed in locations where air for combustion

would contain chlorinated, halogenated or acidic

vapors. If located in such an environment, premature

failure of the unit could occur!

Figure 7. Heater location

Table 2. Standard applications approximate heat throw distances (see Figure 8)

“H”(a) Unit Size Btu/h (kW)

ft. 100,000 125,000 150,000 175,000 200,000 225,000 250,000 300,000 350,000 400,000

(m) (29.3) (36.6) (43.9) (51.2) (58.6) (65.9) (73.2) (87.8) (102.5) (117.1)

8 60657075808590105110120

(2.4) (18.3) (19.8) (21.3) (22.9) (24.4) (25.9) (27.4) (32.0) (33.5) (36.6)

10 54 56 60 64 68 72 78 90 95 100

(3.0) (16.5) (17.1) (18.3) (19.5) (20.7) (21.9) (23.8) (27.4) (29.0) (30.5)

12 44 46 49 57 61 65 68 80 84 90

(3.7) (13.4) (14.0) (20.7) (17.4) (18.6) (19.8) (20.7) (24.4) (25.6) (27.4)

15 NR NR 45 49 52 56 60 70 74 80

(4.6) (22.6) (14.9) (15.8) (17.1) (18.3) (21.3) (22.6) (24.4)

20 NR NR NR NR 46 50 54 63 66 70

(6.1) (14.0) (15.2) (16.5) (19.2) (20.1) (21.3)

Note: NR = Not recommended.

(a) H = Distance from floor to bottom of the unit.

Installation: Mechanical

GHND-SVX01C-EN 13

Air for Combustion. The unit heater shall be installed in

a location in which the facilities for ventilation permit

satisfactory combustion of gas, proper venting, and the

maintenance of ambient temperature at safe limits under

normal conditions of use. The unit heater shall be located

in such a manner as not to interfere with proper circulation

of air within the confined space. When buildings are so

tight that normal infiltration does not meet air

requirements, outside air shall be introduced per Sections

1.3.4.2 and 1.3.4.3 of ANSI Z223.1 for combustion

requirements. A permanent opening or openings having a

total free area of not less than one square inch per

5,000 Btu/h (1.5 Kw) of total input rating of all appliances

within the space shall be provided.

Note: Unit heater sizing should be based on heat loss

calculations where the unit heater output equals or

exceeds heat loss. Heater output is approximately

80 percent of input Btu/hr rating.

Clearances

Each gas unit heater shall be located with respect to

building construction and other equipment so as to permit

access to the Unit Heater. Clearance between walls and the

vertical sides of the Unit Heater shall be no less than

18 inches (457 mm). A minimum clearance of 6 inches

(152 mm) must be maintained between the top of the Unit

Heater and the ceiling. The bottom of the Unit Heater must

be no less than 12 inches (305 mm) from any combustible.

The distance between the flue collector and any

combustible must be no less than 6 inches (152 mm). Also

see “Air for Combustion,” p. 13 and “Venting for Power

Vented (Category III) Unit Heaters,” p. 18.

Note: Increasing the clearance distances may be

necessary if there is a possibility of distortion or

discoloration of adjacent materials.

Figure 8. Heat throw distances

NOTICE:

Maintain Minimum Thermostat Setting!

Unit heaters should not be installed to maintain low

temperatures and/or freeze protection of buildings. A

minimum of 50°F (10°C) thermostat setting must be

maintained. If unit heaters are operated to maintain

lower than 50°F (10°C), hot flue gases are cooled inside

the heat exchanger to a point where water vapor (a flue

gas by-product) condenses onto the heat exchanger

walls. The result is a mildly corrosive acid that

prematurely corrodes the aluminized heat exchanger

and can actually drip water down from the unit heater

onto the floor surface. Additional unit heaters should

be installed if a minimum 50°F (10°C) thermostat

setting cannot be maintained. Failure to follow these

recommendations could result in equipment or

property damage.

WARNING

Overheating or Flooding Could Cause Fire

or Explosion!

Overheating or flooding (where any part of the unit

heater has been under water) could result in fire or

explosion. Should overheating occur, or the gas supply

fails to shut off, shut off the manual gas valve to the

unit heater before shutting off the electrical supply. Do

not use the unit heater if any part has been under

water. Immediately call a qualified service technician to

inspect the unit heater and replace any gas control

which has been underwater. Failure to follow these

recommendations could result in death or serious

injury.

WARNING

Hazardous Gases and Flammable Vapors!

Exposure to hazardous gases from fuel substances

have been shown to cause cancer, birth defects or other

reproductive harm. Improper installation, adjustment,

alteration, service or use of this product could cause

flammable mixtures. To avoid hazardous gases and

flammable vapors follow proper installation and set up

of this product and all warnings as provided in this

manual. Failure to follow all instructions could result in

death or serious injury.

“H”

Unit

Heater

Floor Line

WARNING

Heavy Objects!

Make certain that the lifting methods used to lift the

heater and the method of suspension used in the field

installation of the heater are capable of uniformly

supporting the weight of the heater at all times. Make

certain that the structure to which the heater is

mounted is capable of supporting its weight. Under no

circumstances must the gas lines, the venting system

or the electrical conduit be used to support the heater;

or should any other objects (i.e. ladder, person) lean

against the heater, gas lines, venting system or the

electrical conduit for support. Failure to follow

recommendations could result in death or serious

injury.

Installation: Mechanical

14 GHND-SVX01C-EN

Note: Refer to Figure 1, p. 7 through Figure 9, p. 14, and

dimensional data per Table 1, p. 10 for suspension

of units.

Nozzle Assembly

Use the following procedure for assembling the 30-, 60-, or

90-degree nozzle assembly to your unit heater.

1. Remove the louvers and the cone springs from the unit

heater.

2. Remove the four (4) screws from the upper section of

the front of the unit heater and use these same screws

to temporarily attach the top bracket

(P/N 252-07948-00X).

a. Using the holes in the top bracket as a guide, pre-

drill a 1/8” (0.125”) hole at each location across the

front panel of the unit heater.

b. Using the enclosed screws, permanently attach the

top bracket.

3. Remove the upper two (2) screws from the lower

section on the front of the unit heater. Repeat the

procedure described in Step 2 using the bottom

bracket (P/N 252-07949-00X).

4. Using the sixteen (16) 5/16-12 x 1/2 screws, attach the

left and right side panel (P/N 251-07944 and 251-07946)

to the unit heater using the holes to which the louvers

were attached.

5. Using the enclosed #8-18 x 1/2 screws and with the top

panel oriented such that the side with the larger holes

is facing the unit heater, attach the top panel

(P/N 251-07942-00X) to the top bracket and the two (2)

side panels.

Note: The top panel must be attached so that the side

with the larger holes is facing the unit heater;

this is a requirement for later steps in this

installation procedure.

6. Using the enclosed #8-18 x 1/2 screws and with the

bottom panel oriented such that the side with the larger

holes is facing the unit heater, attach the bottom panel

(P/N 251-07943-00X) to the bottom bracket and the two

(2) side panels.

Note: The bottom panel must be attached so that the

side with the larger holes is facing the unit

heater; this is a requirement for later steps in

this installation procedure.

7. For 30-degree nozzle assemblies: Go to Step 10.

8. For 60- and 90-degree nozzle assemblies: Using the

enclosed #8-18 x 1/2 screws and with the top and

bottom panels oriented such that the sides with the

larger holes are facing the unit heater, create a

sub-assembly by attaching the top panel

(P/N 251-07942-00X) and the bottom panel

(P/N 251-07943-00X) to the left side panel

(P/N 251-07945) and to the right side panel

(P/N 251-07947).

Note: The top and bottom panels must be attached so

that the sides with the larger holes are facing

the unit heater; this makes the assembly easier.

NOTICE:

Equipment Damage!

Unit heaters must be hung level from side to side and

from front to back, see Figure 1, p. 7 and Figure 6, p. 11

through Figure 9, p. 14. Failure to do so could result in

poor performance and/or premature failure of the unit.

WARNING

Heavy Objects!

Ensure that all hardware used in the suspension of each

unit heater is capable of supporting the unit weight.

Failure to do so could result in unit falling off its

mounting location, which could result in death or

serious injury.

Figure 9. Heater mounting 100/400 MBtu unit sizes

Installation: Mechanical

GHND-SVX01C-EN 15

Note: For 90-degree nozzle assemblies, repeat Step 8

to create a second sub-assembly.

9. For 60- and 90-degree nozzle assemblies: Using the

enclosed #8-18 x 1/2 screws, attach the sub-assembly

created in Step 8 to the 30-degree assembly installed to

the unit (in Step 1 through Step 6 of this procedure).

Attach the corresponding panels (i.e., top panel to top

panel, right side panel to right side panel, etc).

Note: For 90-degree nozzle assemblies, install the

second sub-assembly by attaching it to the first

sub-assembly. Attach the corresponding panels

(i.e., top panel to top panel, right side panel to

right side panel, etc).

10. Install the louvers and cone springs.

16 GHND-SVX01C-EN

Installation: Piping

Gas Supply Piping

Pipe Sizing

To provide adequate gas pressure at the gas unit heater,

size the gas piping as follows:

1. Find the ft3/hr by using the following formula:

2. Refer to Ta b l e 3, p. 17. Match “Length of Pipe” with

appropriate “Gas Input - Ft3/Hr” value. This value can

then be matched to the pipe size at the left of the table.

Example: It is determined that a 67 foot (20.4 m) run of

gas pipe is required to connect a 200 MBtu gas unit

heater to a 1,000 Btu/ft3 (0.29 kW) natural gas supply.

Using Table 3, p. 17, a 1-inch pipe is needed.

Notes:

•See “General Safety Information,” p. 7 for English/SI

(metric) unit conversion factors.

•If more than one gas unit heater is to be served by the

same piping arrangement, the total cubic feet per hour

input and length of pipe must be considered.

•If the gas unit heater is to be fired with LP gas, consult

the local LP gas dealer for pipe size information.

Before any connection is made to an existing line

supplying other gas appliances, contact the local gas

company to make certain that the existing line is of

adequate size to handle the combined load.

WARNING

Flammable Vapors!

When connecting to existing gas lines be sure to valve

off the gas supply ahead of connection point. To avoid

explosion or possible fire, always purge all residual gas

from piping before cutting into existing line or

removing threaded fittings. Failure to remove all gas

vapors could result in death or serious injury or

equipment or property-only damage.

ft3/hr = Input

Btu per ft3

200,000 Btu/hr = 200 ft3/hr

1,000 Btu/ft3

WARNING

Hazard of Explosion and Fire!

Heater installation for use with propane (LP gas) must

be made by a qualified LP Gas Dealer or LP Gas Installer

to ensure that all appropriate codes, installation

procedures, and precautions have been followed.

Failure to follow these instructions could result in death

or serious injury.

Installation: Piping

GHND-SVX01C-EN 17

Pipe Installation

1. Install the gas piping in accordance with applicable

local codes.

2. Check gas supply pressure. Each unit heater must be

connected to a gas supply capable of supplying its full

rated capacity as specified in Tab l e 4, p. 18. A field LP

tank regulator must be used to limit the supply

pressure to maximum of 14 in. wc (3.5 kPa). All piping

should be sized in accordance with the latest edition of

ANSI Standard Z223.1 National Fuel Gas Code; in

Canada, according to CSA-B149. See Ta b l e 1, p. 10,

Ta b l e 3, p. 17, and Ta b l e 4, p. 18 for correct gas supply

piping size.

If gas pressure is excessive on natural gas applications,

install a pressure regulating valve in the line upstream

from the main shutoff valve.

3. To prevent the mixing of moisture with gas, run the

take-off piping from the top, or side, of the main.

4. Standard gas duct furnaces, optional two-stage units,

and hydraulic modulating units are supplied with a

combination valve which includes:

a. Manual “A” valve

b. Manual “B” valve

c. Solenoid valve

d. Pilot safety

e. Pressure regulator

Table 3. Gas pipe size(a)

Nominal

Iron Pipe

Size, in.

Internal

Diameter,

in. (mm)

Length of Pipe, ft (m)

10 20 30 40 50 60 70 80 90 100 125 150 175 200

(3.0) (6.1) (9.1) (12.2) (15.2) (18.3) (21.3) (24.4) (27.4) (30.5) (38.1) (45.7) (53.3) (61.0)

1/2 0.622 175 120 97 82 73 66 61 57 53 50 44 40 37 35

(16) (4.96) (3.40) (2.75) (2.32) (2.07) (1.87) (1.73) (1.61) (1.50) (1.42) (1.25) (1.13) (1.05) (0.99)

3/4 0.824 360 250 200 170 151 138 125 118 110 103 93 84 77 72

(21) (10.2) (7.08) (5.66) (4.81) (4.28) (3.91) (3.54) (3.34) (3.11) (2.92) (2.63) (2.38) (2.18) (2.04)

1 1.049 680 465 375 320 285 260 240 220 205 195 175 160 145 135

(27) (19.3) (13.2) (10.6) (9.06) (8.07) (7.36) (6.80) (6.23) (5.80) (5.52) (4.96) (4.53) (4.11) (3.82)

1-1/4 1.380 1400 950 770 660 580 530 490 460 430 400 360 325 300 280

(35) (39.6) (26.9) (21.8) (18.7) (16.4) (15.0) (13.9) (13.0) (12.2) (11.3) (10.2) (9.20) (8.50) (7.93)

1-1/2 1.610 2100 1460 1180 990 900 810 750 690 650 620 550 500 460 430

(41) (59.5) (41.3) (33.4) (28.0) (25.5) (22.9) (21.2) (19.5) (18.4) (17.6) (15.6) (14.2) (13.0) (12.2)

2 2.067 3950 2750 2200 1900 1680 1520 1400 1300 1220 1150 1020 950 850 800

(53) (112) (77.9) (62.3) (53.8) (47.6) (43.0) (39.6) (36.8) (34.5) (32.6) (28.9) (26.9) (24.1) (22.7)

2-1/2 2.469 6300 4350 3520 3000 2650 2400 2250 2050 1950 1850 1650 1500 1370 1280

(63) (178) (123) (99.7) (85.0) (75.0) (68.0) (63.7) (58.0) (55.2) (52.4) (46.7) (42.5) (38.8) (36.2)

3 3.068 11000 7700 6250 5300 4750 4300 3900 3700 3450 3250 2950 2650 2450 2280

(78) (311) (218) (177) (150) (135) (122) (110) (105) (97.7) (92.0) (83.5) (75.0) (69.4) (64.6)

4 4.026 23000 15800 12800 10900 9700 8800 8100 7500 7200 6700 6000 5500 5000 4600

(102) (651) (447) (362) (309) (275) (249) (229) (212) (204) (190) (170) (156) (142) (130)

Notes:

1. Determine the required ft3/h by dividing the rated heater input by 1000. For SI / Metric measurements: Convert unit Btu/h to kilowatts. Multiply the

unit input (kW) by 0.0965 to determine m3/h.

2. FOR NATURAL GAS: Select the pipe size directly from the table.

3. FOR PROPANE GAS: Multiply the ft3/h (m3/h) value by 0.633; then use the table.

4. Refer to the metric conversion factors listed in “General Safety Information,” p. 7 for more SI unit measurements/conversions.

(a)Maximum capacity of pipe in cubic feet of gas per hour (cubic meters per hour) for gas pressures of 0.5 psig (3.5 kPa) or less, and a pressure drop of

0.5 inch water column (124.4 Pa) (based on a 0.60 specific gravity gas).

WARNING

Hazard of Explosion!

Adequately support the piping to prevent strain on the

gas manifold and controls. To prevent explosion, fire, or

gas leaks, support piping so that piping does not sag or

put pressure on the burners internal to the unit. Failure

to follow these recommendations could result in death

or serious injury or equipment or property-only-

damage.

Installation: Piping

18 GHND-SVX01C-EN

Pipe directly in to combination valve (see Figure 10,

p. 18).

5. A 1/8 in. N.P.T. plugged tapping, accessible for test

gauge connection, must be installed immediately

upstream of the gas supply connection to the

appliance.

6. Provide a drip leg in the gas piping near the gas unit

heater. A ground joint union and a manual gas shutoff

valve should be installed ahead of the unit heater

controls to permit servicing. The manual main shutoff

valve must be located external to the jacket (see

Figure 10, p. 18).

7. Make certain that all connections have been

adequately doped and tightened.

Note: Use pipe joint sealant resistant to the action of

liquefied petroleum gases regardless of gas

conducted.

The appliance and its individual shutoff valve must be

disconnected from the gas supply piping system during

any pressure testing of that system at test pressures in

excess of 1/2 psig (3.5 kPa).

The appliance must be isolated from the gas supply piping

system by closing its individual manual shutoff valve

during any pressure testing of the gas supply piping

system at test pressures equal to or less than 1/2 psig

(3.5 kPa).

Installation: Venting

Venting for Power Vented (Category III)

Unit Heaters

All unit heaters must be vented!

All venting installations shall be in accordance with the

latest edition of Part 7, venting of Equipment of the

National Fuel Gas Code, ANSI Z223.1, or applicable

NOTICE:

Overtightening!

Do not overtighten the inlet gas piping into the valve.

This may cause stresses that could crack the valve!

WARNING

Hazard of Explosion!

Never use an open flame to detect gas leaks. Explosive

conditions may occur. Use a leak test solution or other

approved methods for leak testing. Failure to follow

recommended safe leak test procedures could result in

death or serious injury or equipment or property-only-

damage.

Figure 10. Pipe installation, standard controls

D 3 6 31 C

Table 4. Gas piping requirements

Gas Type Natural Gas Propane (LP) Gas

Single Stage Gas Piping Requirements(a)

(a)For single stage applications only, at normal altitudes.

Manifold Pressure 3.5 in. wc 10.0 in. wc

(0.9 kPa) (2.5 kPa)

Supply Inlet Pressure 14.0 in. wc Max. 14.0 in. wc Max.

(3.5 kPa) (3.5 kPa)

5.0 in wc Min. 11.0 in wc Min.

(1.2 kPa) (2.7 kPa)

Two Stage Gas Piping Requirements(b)

(b)For two stage applications only, at normal altitudes.

Supply Inlet Pressure 6.5 in. wc Min. 11.5 in. wc Min.

(1.6 kPa) (2.9 kPa)

WARNING

Carbon Monoxide!

Your venting system must not be blocked by any snow,

snow drifts, or any foreign matter. Inspect your venting

system to ensure adequate ventilation exists at all

times! A blocked venting system could result in carbon

monoxide poisoning. Symptoms of such condition

include grogginess, lethargy, inappropriate tiredness,

or flu-like symptoms. Failure to follow these

recommendations could result in death or serious

injury.

WARNING

Risk of Fire and Carbon Monoxide

Poisoning with Improper Piping!

Never use a pipe of a diameter other than that specified

in Table 1, p. 10! To prevent pipe from melting and

introducing exhaust fumes into the air supply, never

use PVC, ABS or any other non-metallic pipe for

venting! To prevent fan restriction, an elbow should

never be attached directly to the venter. Failure to

follow recommendations could result in death or

serious injury or equipment damage.

Installation: Piping

GHND-SVX01C-EN 19

provisions of local building codes for natural or power

vented units.

Power vented units are designed to be used with single

wall vent pipe utilizing horizontal or vertical venting

arrangements (see Figure 16, p. 23 through Figure 18).

These arrangements may terminate external to the

building using either a single wall or double wall vent. See

Figure 11, p. 20 through Figure 18, p. 23 for special

installation requirements regarding these venting

conditions.

If double wall venting (other than Type B; see preceding

warning) is used, components which are UL Listed and

approved for Category III positive pressure venting

systems MUST be used.

A Briedart Type L, Field Starkap or an equivalent vent cap

must be supplied by the customer for each power vented

unit. The vent pipe diameter MUST be as specified in

Tab l e 1 , p. 10 (“D” Dia. Flue Opening). A reducer must be

field installed for 100 through 175 MBh Unit Sizes. All 300

through 400 MBh Unit sizes are factory equipped with the

required flue increaser. Refer to Figure 11, p. 20 through

Figure 15, p. 22 for additional requirements.

The venting system for these appliances shall terminate at

least four feet (1.2 m) below, four feet (1.2 m) horizontal

from, or one foot (0.3 m) above any door, window, or

gravity air inlet into any building.

Through the wall vents for these appliances shall NOT

terminate 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.

The vent pipe equivalent length must be five feet (1.5 m)

minimum and must not exceed 50 feet (15.2 m).

Equivalent length is the total length of straight sections

PLUS 15 feet (4.6 m) for each 90 degree elbow, eight feet

(2.4 m) for each 45 degree elbow, and 10 feet (3.0 m) for

the vent cap.

Maintain six inches (152 mm) between vent pipe and

combustible materials. A minimum of 12 inches (305 mm)

of straight pipe is required from the venter outlet before

installing an elbow in the vent system. Never attach an

elbow directly to the venter (see preceding warning).

Use single wall pipe constructed of 26 gauge galvanized

steel or material of equivalent durability and corrosion

resistance for the vent system. For installation in Canada,

use pipe constructed from 0.025-inch thick aluminum or

0.018-inch thick stainless steel.

Any run of single wall vent pipe passing through an

unheated space must be insulated with an insulation

suitable to 550°F.

The vent terminal must be installed with a minimum

clearance of four feet (1.2 m) from electric meters, gas

meters, regulators and relief equipment.

Seal ALL vent pipe joints and seams to prevent leakage.

Use General Electric RTV-108 or Dow Corning® RTV-732

silicone sealant (or equivalent) or 3M #425 aluminum foil

tape or equivalent.

The vent system must be installed to prevent collection of

condensate. Vertical vent pipes should be equipped with

condensate drains. Pitch horizontal pipes downward 1/4

inch per foot (21 mm per m) toward outlet for condensate

drainage

Horizontal portions of the venting system shall be

supported at maximum intervals of four feet (1.2 m) to

prevent sagging (in Canada, support at three feet (1 m)

minimum intervals).

Insulate single wall vent pipe exposed to cold air or

running through unheated areas.

Units are shipped from the factory set up for vertical

venting. To convert the power venter for horizontal

venting, remove the shipping support bracket; refer to

Figure 11, p. 20, Figure 16, p. 23 through Figure 18, and

Figure 23, p. 35, and follow this procedure:

1. Hold power venter motor in position.

2. Remove the three Phillips-head screws from the motor

adaptor plate.

3. Remove the three screws which connect the power

venter stack to the power venter housing.

4. Rotate the power venter housing to the horizontal

position.

5. Replace screws accordingly.

Note: The motor, pressure switch, and junction box

bracket MUST remain located as shipped from the

factory for safe operation. Rotate only the blower

housing! If the power venter housing is to be

WARNING

Risk of Carbon Monoxide Poisoning with

Type B Vent!

Do not use a type B double wall vent internally within

the building on power vented units! Type B vent does

not seal well under positive pressure and could result in

exhaust fume leaks. Failure to follow these

recommendations could result in death or serious

injury.

WARNING

Carbon Monoxide!

Never operate unit heaters without combustion air and

flue gas piping in place. Each unit heater MUST have its

own combustion air system and MUST NOT be

connected to other vent systems or to a chimney. Your

venting system must not be blocked by any snow, snow

drifts, or any foreign matter. Inspect your venting

system to ensure adequate ventilation exists at all

times! Failure to follow these recommendations could

result in death or serious injury.

Installation: Piping

20 GHND-SVX01C-EN

moved to the right horizontal position, the junction

box must be rotated 90 degrees CCW to clear the

connection. To do this, remove all wires, conduit

and conduit connector from the junction box,

noting location of wires. Move box, using holes

provided. Move

7/8-inch plug from bottom of box to side.

Reconnect all wires according to the unit’s wiring

diagram.

The following instructions apply to Canadian installations

in addition to installation and operating instructions:

1. Installation must conform with local building codes, or

in absence of local codes, with current CSA B149.1,

“Installation Codes for Natural Gas Burning

Appliances and Equipment”, or CSA B149.2,

“Installation Codes for Propane Gas Burning

Appliances and Equipment”.

2. Any references to U.S. standards or codes in these

instructions are to be ignored and the applicable

Canadian standards or codes applied.

3. If using a metal vent system under positive gauge

pressure in Canada, a slip fit vent connection must be

secured by at least two corrosion-resistant screws, or

other mechanical locking means.

4. The vent shall not terminate:

a. Less than six feet (1.8 m) from a combustion air inlet

or another appliance.

b. Less than three feet (1 m) from any other building

opening or any gas service regulator.

c. Directly above a gas utility meter or service

regulator.

Table 5. Vent systems—termination clearance

requirements(a)

(a) If the vent terminal is to be installed near ground level, the vent terminal

must be positioned at least twelve inches above the maximum antici-

pated snow depth (see following for Canadian requirements).

Structure

Minimum for

Termination Locations

Door, window or any gravity air inlet 4 feet below

4 feet horizontally

1 foot above

Forced air inlet within 10 ft. 3 feet above

Adjoining building or parapet 6 feet

Adjacent public walkways 7 feet above grade

Figure 11. Adaptor installation

Refer to specification table and installation manual for proper usage.

Note: The reducer must be field supplied for 100, 125, 150, and

175 MBh unit sizes.

Installation: Piping

GHND-SVX01C-EN 21

Figure 12. Horizontal arrangement—single wall vent system to single wall termination

Figure 13. Vertical arrangement—single wall vent system to single wall termination

Installation: Piping

22 GHND-SVX01C-EN

Figure 14. Horizontal arrangement—single wall vent system to double wall termination

Figure 15. Vertical arrangement—single wall vent system to double wall termination

Installation: Piping

GHND-SVX01C-EN 23

Figure 16. Horizontal left vent position (rear view of

unit heater)

Figure 17. Horizontal right vent position (rear view of

unit heater)

Figure 18. Vertical vent position (side view of unit

heater)

Tee With Drip Leg &

Cleanout Cap At Lowes t

Point Of Vent System (Typ.) D4072

To Horizontal Flue

Vent Termination

Reducer/Increaser

Where Applicable

Power Venter

Power Venter

Tee With Drip Leg &

Cleanout Cap At Lowes t

Point Of Vent System (Typ.)

D4073

To Horizontal Flue

Vent Termination

Reducer/Increaser

Where Applicabl e

D4071

AI R FLO W

Power Venter

Tee With

Drip Leg &

Cleanout Cap

To Vertical Flue

Vent Termination

Reducer/Increaser

Where Applicable

24 GHND-SVX01C-EN

Installation: Electrical

Electrical Connections

Standard units are shipped for use on 115 volt, 60 hertz

single phase electric power. The motor nameplate and

electrical rating of the transformer should be checked

before energizing the unit heater electrical system. All

external wiring must conform to the latest edition of ANSI/

NFPA No. 70 National Electrical Code and applicable local

codes; in Canada, to the Canadian Electrical Code, Part 1

CSA Standard C22.1.

It is recommended that the electrical power supply to each

unit heater be provided by a separate, fused, and

permanently live electrical circuit. A disconnect switch of

suitable electrical rating for each unit heater should be

located as close to the gas valve and controls as possible.

Each unit heater must be electrically grounded in

accordance with the latest edition of the National Electric

Code, ANSI/NFPA No. 70 or CSA Standard C22.1.

The transformer supplied with this unit heater is internally

fused. Any overload or short circuit will ruin the

transformer.

Thermostat Wiring and Location

Note: The thermostat must be mounted on a vertical,

vibration-free surface, free from air currents, and in

accordance with the furnished instructions.

Mount the thermostat approximately 5 feet (1.5 m) above

the floor in an area where it will be exposed to a free

circulation of average temperature air. Always refer to the

thermostat instructions as well as our unit wiring diagram,

and wire accordingly. Avoid mounting the thermostat in

the following locations:

1. Cold areas—Outside walls or areas where drafts may

affect the operation of the control.

2. Hot areas—Areas where the sun’s rays, radiation, or

warm air currents may affect control operation.

3. Dead areas—Areas where air cannot circulate freely,

such as behind doors or in corners.

Note: Thermostat wires tagged “W” and “G” must be

connected together except when using a general

purpose “SPDT” 24 Vac relay and a standard

thermostat with subbase, or when using

Honeywell T834H or T834 thermostats. Also refer

to Figure 19, p. 24 for other wiring connections.

Thermostat Heat Anticipator Adjustments. The

initial heat anticipator setpoint should equal the

thermostat’s current amperage draw when the unit is

firing. This setpoint should be measured for the best

results. Use the recommended ranges as a guide. If further

information is needed, consult your thermostat

manufacturer’s instructions.

WARNING

Hazardous Service Procedures!

The maintenance and troubleshooting procedures

recommended in this section of the manual could result

in exposure to electrical, mechanical or other potential

safety hazards. Always refer to the safety warnings

provided throughout this manual concerning these

procedures. When possible, disconnect all electrical

power including remote disconnect and discharge all

energy storing devices such as capacitors before

servicing. Follow proper lockout/tagout procedures to

ensure the power can not be inadvertently energized.

When necessary to work with live electrical

components, have a qualified licensed electrician or

other individual who has been trained in handling live

electrical components perform these tasks. Failure to

follow all of the recommended safety warnings

provided, could result in death or serious injury.

WARNING

Hazardous Voltage and Gas!

Turn off the gas supply and disconnect all electric

power, including remote disconnects before servicing

unit. Follow proper lockout/tagout procedures to

ensure the power can not be inadvertently energized

and the gas can not be inadvertently turned on. Failure

to turn off gas or disconnect power before servicing

could result in death or serious injury.

WARNING

Proper Field Wiring and Grounding

Required!

All field wiring MUST be performed by qualified

personnel. Improperly installed and grounded field

wiring poses FIRE & ELECTROCUTION hazards. To

avoid these hazards, you MUST follow requirements for

field wiring installation and grounding as described in

NEC and your local/state electrical codes. Failure to

follow these requirements could result in death or

serious injury.

Figure 19. C1267G, thermostat wiring diagram

Installation: Electrical

GHND-SVX01C-EN 25

Recommended Heat Anticipator Setting Ranges:

Fan Time Delay Control

Leads from the time delay controls are factory wired to the

junction box. The fan control is a time delay relay

(approximately 45 seconds ON, 65 seconds OFF). The fan

control is rated at 17 amps.

Notes:

•The start-up fan delay must not exceed 90 seconds

from a cold start.

•For all wiring connections, refer to the wiring diagram

shipped with your unit (either affixed to the side jacket

or enclosed in your unit’s installation instruction

envelope). Should any original wire supplied with the

heater have to be replaced, it must be replaced with

wiring material having a temperature rating of at least

105°C.

Should any high limit switch wires have to be replaced,

they must be replaced with wiring material having a

temperature rating of 200°C minimum.

25 ft. (7.6 m) T’stat

Wiring 50 ft. (15.2 m) T’stat Wiring

0.85 to 0.90 A 0.90 to 1.1 A Max. Setting on T’stat

26 GHND-SVX01C-EN

Start-Up

Blower Set Up

The drive ratio of the motor and blower sheaves has been

preset at the factory for a temperature rise of 65°F at 0” wc.

If the unit is to be operated under different air flow or

pressure requirements, the drive ratio must be altered by

means of the adjustable sheave on the blower motor (see

Figure 20, p. 26).

1. Ensure that all packing material, support blocks, etc.

have been removed from the unit.

2. Adjust the blower drive belt tension by means of the

two tension bolts on the blower motor base. When

proper tension has been achieved, the mid-point

deflection of the belt will be 3/4” when subjected to a

5 lb. force.

3. Recheck all electrical connections.

4. When power is applied, ensure that the motor and

blower are rotating in a clockwise direction when

viewed from the drive side.

5. Measure the current draw of the motor.

Blower Drive Adjustment

1. Remove the belt guard and loosen the belt tension

bolts on the blower motor base.

2. Loosen the set screw on the adjustable half of the

motor sheave. To increase the blower speed, turn the

adjustable half of the sheave clockwise, counter

clockwise to slow the blower. Retighten the set screw.

3. Realign the blower and motor sheaves if necessary.

4. Adjust the belt tension as specified in “Blower Set Up,”

p. 26, Step 2.

5. Replace the belt guard.

6. Check that the air flow of the unit, the rpm and current

draw of the blower motor and the temperature rise are

within the limits specified in Tab l e 1, p. 10, the blower

motor rating plate and the rating plate on the unit,

respectively.

Note: The blower assembly for 100/250 units consists of

1 wheel, 1 housing, 1 shaft, and 1 bearing set. For

300/400 units, the blower assembly consists of

2 wheels, 2 housings, 1 shaft, and 1 bearing set.

NOTICE:

Equipment Damage!

The “at speed” current draw of the motor must never

exceed that specified on the motor rating plate or

severe damage to the motor could result!

WARNING

Drive Belt!

Disconnect all electrical power including remote

disconnect before adjusting the drive belt. Follow

proper lockout/tagout procedures to ensure the power

can not be inadvertently energized. Failure to do so

could result in drive belt turning on unexpectedly,

which could result in serious injury.

WARNING

Belt Guard!

Never operate the unit without the belt guard in place

or severe personal injury could result!

NOTICE:

Equipment Damage!

Never operate the unit beyond the specified limits or

severe damage to, and/or premature failure of, the unit

could result!

Figure 20. Motor and blower assembly

12

4

3

6

7

5

8

Start-Up

GHND-SVX01C-EN 27

Operation

Explanation of Controls (see Figure 20, p. 26)

1. Each Separated Combustion Unit Heater comes

equipped with a power vent system that consists of a

power venter motor and blower, pressure switch, and

sealed flue collector.

2. The power venter motor is energized by the room

thermostat when a demand for heat is sensed. The

pressure switch measures the pressure differential

between the air inlet and exhaust vent systems. If the

differential is correct, the indirect spark ignition system

is energized.

3. The indirect spark ignition system consists of an

ignition module, a dual combination valve, and a

spark-ignited pilot burner. When the pressure switch is

closed, the pilot valve opens as a spark is generated to

light the pilot. When the flame is sensed by the flame

sensing circuit, the spark ceases, and the main gas

valve is opened to supply gas to the main burners.

Once the thermostat has been satisfied, the vent

system and gas valve are simultaneously de-

energized, stopping all gas flow to the unit.

4. The limit switch interrupts the flow of electric current to

the main gas valve if the unit heater becomes

overheated.

5. The fan switch delays the operation of the fan is

delayed for approximately 45 seconds once the

thermostat is closed, and continues fan operation for

approximately 65 seconds after the thermostat opens.

Note: The start-up fan delay must not exceed 90

seconds from a cold start.

6. The wall thermostat, supplied optionally, is a

temperature sensitive switch that operates the vent

and ignition systems to control the temperature of the

space being heated.

Note: The thermostat must be mounted on a vertical,

vibration-free surface, free from air currents,

and in accordance with the furnished

instructions.

Initial Lighting

1. Open the manual gas valve, in the gas supply line to the

unit heater. Loosen the union in the gas supply line to

purge it of air. Tighten the union and check for leaks.

2. Turn on the electrical power. The unit heater should

now be under the control of the thermostat. Set the

thermostat to its highest setting; the power venter

motor should start and burner ignition occur. Allow the

unit heater to operate until the fan starts, then set the

thermostat to its lowest setting. The burners and

power venter motor should stop operating

immediately while the fan continues to operate until

the fan time delay times out, shutting it off. Reset the

thermostat to the desired operational setting.

Power Vented Propeller Units with

Intermittent (Spark) Pilot Ignition

Explanation of Controls

1. The unit heater is equipped with a power venter

system consisting of a power venter motor and blower,

pressure switch, and sealed flue collector in place of

the conventional draft diverter.

a. The power venter motor is energized by the room

thermostat on a call for heat. The pressure switch

measures the flow through the vent system and

energizes the indirect spark ignition system when

the flow is correct.

WARNING

Carbon Monoxide!

Never operate unit heaters if the power venter is not

operable. Your venting system must not be blocked by

any snow, snow drifts, or any foreign matter. Inspect

your venting system to ensure adequate ventilation

exists at all times! Failure to follow these

recommendations could result in death or serious

injury due to Carbon Monoxide Poisoning (symptoms

include grogginess, lethargy, inappropriate tiredness, or

flu-like symptoms).

NOTICE:

Additional Devices!

The addition of external draft hoods or power venters is

not permitted. Addition of such devices could cause

severe unit malfunction or failure!

WARNING

Hazard of Explosion!

Never use an open flame to detect gas leaks. Explosive

conditions may occur. Use a leak test solution or other

approved methods for leak testing. Before attempting

to light or relight the pilot, wait 5 minutes to allow gas

which may have accumulated in the burner

compartment to escape. Failure to follow

recommended safe leak test procedures or pilot

lighting/relighting instructions could result in death or

serious injury or equipment or property-only-damage.

WARNING

Risk of Fire and Carbon Monoxide

Poisoning!

The pressure switch MUST NOT be bypassed. The unit

MUST NOT be fired unless the power venter is

operating. Failure to follow these recommendations

could result in death or serious injury.

Start-Up

28 GHND-SVX01C-EN

b. The indirect spark ignition system consists of an

ignition control module, a dual combination gas

valve, and a spark-ignited pilot burner. When the

pressure switch closes, the pilot valve opens and a

spark is generated to light the pilot burner. When

the flame sensing circuit senses that pilot flame is

established, the main gas valve is opened to supply

gas to the main burners. When the thermostat is

satisfied, the vent system is de-energized and both

valves are closed to stop all flow of gas to the unit.

2. The limit switch interrupts the flow of electric current to

the main gas valve in case the heater becomes

overheated.

3. The fan switch delays the operation of the fan until the

heater is warmed, then keeps the fan running after the

gas has been turned off until the useful heat has been

removed. The start-up fan delay must not exceed

90 seconds from a cold start.

4. The wall thermostat (supplied optionally) is a

temperature sensitive switch which operates the vent

system and ignition system to control the temperature

of the space being heated. It must be mounted on a

vibration free, vertical surface away from air currents,

in accordance with the instructions furnished with the

thermostat (also refer to “Installation: Electrical,”

p. 24).

Start-Up

Note: Also refer to the lighting instruction plate equipped

on the unit.

1. Open the manual valve supplying gas to the unit

heater, and with the union connection loose, purge air

from the gas line. Tighten the union and check for gas

leaks, using a soapy water solution only.

2. Open the manual valve on the unit heater.

3. Turn ON electrical power.

4. The unit should be under the control of the thermostat.

Turn the thermostat to the highest point and determine

that the power venter motor starts and the pilot and

main burners ignite. Turn the thermostat to the lowest

point and determine that the power venter motor shuts

off and pilot and main burners are extinguished.

5. If pilot adjustment is required, remove the pilot

adjustment seal cap and adjust the pilot screw to

obtain proper flame. Clockwise rotation decreases

pilot flame size. Replace the cap.

6. Turn the thermostat to the desired position.

7. Refer to “Gas Input Rate,” p. 30 and “Gas Pressure

Adjustments,” p. 30 for more specifications.

Shut-Down

1. Turn the valve selector knob to the “OFF” position.

2. Turn off the electricity.

3. To relight, follow the instructions in “Start-Up,” p. 28

(preceding section).

See Figure 21, p. 29 for parts/identification.

NOTICE:

Additional Devices!

The addition of external draft hoods or power venters is

not permitted. Addition of such devices could cause

severe unit malfunction or failure!

WARNING

Hazard of Explosion!

Never use an open flame to detect gas leaks. Explosive

conditions may occur. Use a leak test solution or other

approved methods for leak testing. Before attempting

to light or relight the pilot, wait 5 minutes to allow gas

which may have accumulated in the burner

compartment to escape. Failure to follow

recommended safe leak test procedures or pilot

lighting/relighting instructions could result in death or

serious injury or equipment or property-only-damage.

Start-Up

GHND-SVX01C-EN 29

Figure 21. Burner components—intermittent pilot ignition(a)

(a) Also refer to Figure 6, p. 11, Figure 10, p. 18, and Figure 3, p. 8 through Figure 5, p. 9 for component locations.

1

2

Burner Drawer Common Parts:

1. Main Burners

2. Burner Manifold

3. Air Shutters

4. Burner Springs

5. Main Burner Orifice

6. Transformer

7. Pilot Tubing

Controls:

8A.Main Gas Valve (Honeywell)

8B.Main Gas Valve (White-Rodgers)

9. Honeywell Ignitor

10. Honeywell Pilot Burner

13. High Limit (Safety device located on the rear

header plate of the heat exchanger, air inlet side.)

1

3

54

D4298A

8A

C

10

7

SPARK

1

M

V

2

MV/PV

34

GND

(BURNER)

P

V

56

7

8

9

24V

(GND

)

24V

TH-W

(OPT.)

Honeywell

WARNING

S8600M

CONTINUOUS RE-TRY

100% SHUTOFF IP

90 SEC. TRIAL FOR IGNITION

9

8B

13

D3684A

6

Start-Up

30 GHND-SVX01C-EN

Gas Input Rate

Check the gas input rate as follows:

1. Turn off all gas appliances that utilize gas through the

same gas meter as the unit heater.

2. Turn gas on to the unit heater.

3. Using the gas meter, clock the time that it takes to burn

one cubic foot of gas (Heating Value).

4. Insert the time, in seconds, into the formula below:

Example: If the heating value = 1000 BTU/ft3 and the time/

ft3 = 18 s/ft3 then

Input Rate = 200,000 BTU/hr

(Refer to “General Safety Information,” p. 7 for metric

conversions.)

Note: If the computation exceeds, or is less than 95

percent of the gas Btu/h input rating (see “Unit

Dimensions and Weights,” p. 10), adjust the gas

pressure:.

Gas Pressure Adjustments

Adjust the gas pressure as follows:

1. NATURAL GAS: Optimum results are obtained when

the heater is operating at its full input rating with the

manifold pressure of 3.5 inches wc (0.9 kPa).

Adjustment of the pressure regulator is not normally

necessary since it is preset at the factory.

However, field adjustment may be made as follows:

a. Attach manometer at pressure tap plug adjacent to

control outlet.

b. Remove the regulator adjustment screw cap,

located on the combination gas valve.

c. With a small screwdriver, rotate the adjustment

screw counterclockwise to decrease or clockwise to

increase pressure. Do not force beyond stop limits.

d. Replace regulator adjustment screw cap.

2. PROPANE GAS: An exact manifold pressure of

10.0 inches wc (2.5 kPa) must be maintained for proper

operation of the heater. If the unit is equipped with a

pressure regulator on the combination gas valve,

follow Step a through Step d (above). If the unit is not

so equipped, the propane gas supply system pressure

must be regulated to attain this manifold operating

pressure.

3. The adjusted manifold pressure should not vary more

than 10 percent from the pressure specified in Tab l e 6,

p. 30.

Primary Air Shutter Adjustment

After the unit has been operating for at least 15 minutes,

adjust the primary air flow to the burners. Turn the friction-

locked, manually-rotated air shutters clockwise to close, or

counterclockwise to open (see Figure 21, p. 29, Figure 3,

p. 8, and Figure 5, p. 9).

For correct air adjustment, close the air shutter until yellow

tips in the flame appear. Then open the air shutter to the

point just beyond the position where yellow tipping

disappears. Refer to Figure 22.

Note: There may be momentary and spasmodic orange

flashes in the flame. This is caused by the burning

of airborne dust particles, and should not be

confused with the yellow tipping, which is a stable

NOTICE:

Overfiring!

Never overfire the unit heater, as this could cause

unsatisfactory operation, or shorten the life of the

heater.

Input Rate = Heating Value (Btu/ft3) (3600 s/hr)

Time (s/ft3)

Input Rate = (1000 BTU/ft3) (3600 s/hr)

18 s/ft3

Table 6. Main burner orifice schedule(a)

(a) This schedule is for units operating at normal altitudes of 2000 feet

(610 m) or less. SPECIAL ORIFICES ARE REQUIRED FOR INSTALLA-

TIONS ABOVE 2,000 FEET (610 m).

Input in

1000

BTU(a)

Type of Gas Natural Propane

No. of

Burner

Orifices

Heating

Value

1075 BTU/ft3

(40.1 MJ/m3)

2500 BTU/ft3

(93.1 MJ/m3)

Manifold

Pressure 3.5” wc (0.9 kPA)

10” wc (2.5 kPA)

100 ft3/hr 96 40 4

Orifice Drill 42 54

125 ft3/hr 120 50 5

Orifice Drill 42 54

150 ft3/hr 140 60 6

Orifice Drill 42 54

175 ft3/hr 163 70 7

Orifice Drill 42 54

200 ft3/hr 186 80 8

Orifice Drill 42 54

225 ft3/hr 210 90 9

Orifice Drill 42 54

250 ft3/hr 233 100 10

Orifice Drill 42 54

300 ft3/hr 280 120 12

Orifice Drill 42 54

350 ft3/hr 326 140 14

Orifice Drill 42 54

400 ft3/hr 372 160 16

Orifice Drill 42 54

Note: When installed in Canada, any references to deration at altitudes in

excess of 2000 feet (610 m) are to be ignored. At altitudes of 2000

to 4500 feet (610 to 1372 m), the unit heaters must be orificed to

90 percent of the normal altitude rating, and be so marked in

accordance with the ETL certification.

Start-Up

GHND-SVX01C-EN 31

or permanent situation when there is insufficient

primary air.

Pilot Adjustment

1. Remove the pilot adjustment cap.

2. Adjust the pilot screw to provide a properly sized

flame.

3. A proper pilot flame is a soft steady flame that

envelops 3/8- to 1/2-inch (9.5 to 12.7 mm) of the flame

sensor.

4. Replace the pilot adjustment cap.

Manifold Pressure Adjustment

If the manifold pressure requires minor adjustment,

remove the cap from the pressure regulator and turn the

adjustment screw clockwise to increase the pressure, or

counterclockwise to decrease the pressure. The adjusted

manifold pressure should not vary more than 10 percent

from the pressures specified in Table 6, p. 30.

Figure 22. Main burner flames

LIFTING

(TOO MUCH AIR)

NORMAL

(HARD FLAME)

YELLOW TIPPING

(MARGINAL)

YELLOW FLAME

(TOO LITTLE AIR)

Start-Up

32 GHND-SVX01C-EN

Gas Equipment Start-Up

Customer _____________________________________________ Job Name & Number _________________________

Pre-Inspection Information with Power and Gas Off

Type of Equip: Unit Heater

Serial Number: _________________________ Model Number: _____________________________

Name Plate Voltage: ____________________ Name Plate Amperage: ______________________

Type of Gas: Natural LP Tank Capacity: _______ lb Rating: _______ Btu @ ____ °F

_______ kg ________ kW @ ____ °C

Are all panels, doors, vent caps in place?

Has the unit suffered any external damage? Damage ______________________________

Does the gas piping and electric wiring appear to be installed in a professional manner?

Has the gas and electric been inspected by the local authority having jurisdiction?

Is the gas supply properly sized for the equipment?

Were the installation instructions followed when the equipment was installed?

Have all field installed controls been installed?

Do you understand all the controls on this equipment? If not, contact your wholesaler or rep. (DO NOT START

this equipment unless you fully understand the controls.)

Remarks: _____________________________________________________________________________________________________

_______________________________________________________________________________________________________________

_______________________________________________________________________________________________________________

GENERAL

With power and gas off.

Make certain all packing has been removed.

Tighten all electrical terminals and connections.

Check all fans and blowers for free movement.

Check all controls for proper settings.

BLOWER

With power on and gas off.

Check voltage L1 _____ L2 _____ L3 _____

Check rotation of main fan.

Check motor amps L1 _____ L2 _____ L3 _____

GAS HEATING

With power and gas on.

Inlet gas pressure. ____ in. wc or ____ kPa

Pilot and main burner ignition.

Manifold gas pressure. ____ in. wc or ____ kPa

Check electronic modulation. Set at: __________

Cycle and check all other controls not listed.

Entering air temp. _____ °F or ____ °C

Discharge air temp. (high fire) ____ °F. or ____ °C

GHND-SVX01C-EN 33

Maintenance

Periodic Service

All Maintenance/Service information should be recorded

accordingly on the inspection sheet provided in this

manual (see “Gas Equipment Start-Up,” p. 32).

Note: The heater and vent system should be checked

once a year by a qualified technician.

Important: Gas tightness of the safety shut-off valves

must be checked on at least an annual basis.

To check gas tightness of the safety shut-off valves, turn off

the manual valve upstream of the appliance combination

control. Remove the 1/8-inch pipe plug on the inlet side of

the combination control and connect a manometer to that

tapping. Turn the manual valve on to apply pressure to the

combination control. Note the pressure reading on the

manometer, then turn the valve off. A loss of pressure

indicates a leak. If a leak is detected, use a soap solution to

check all threaded connections. If no leak is found,

combination control is faulty and must be replaced before

putting appliance back in service.

Should maintenance be required, perform the following

inspection and service routine:

1. Inspect the area near the unit to be sure that there is no

combustible material located within the minimum

clearance requirements listed in this manual.

2. Turn off the manual gas valve and electrical power to

the gas unit heater.

3. To clean or replace the main burners, remove the

bottom panel and compress the spring by moving the

burner toward the manifold. Slide the opposite end of

the burner downward from the locating slot while

retaining spring is still compressed. Pull the burners

away from the heat.

4. With the burners removed, wire brush the inside

surfaces of the heat exchanger.

5. Remove any dirt, dust, or other foreign matter from the

burners using a wire brush and/or compressed air.

Ensure that all parts are unobstructed. Inspect and

clean pilot burner if necessary.

6. Reassemble the gas unit heater by replacing all parts in

reverse order.

7. Complete the appropriate unit start-up procedure as

given in “Operation,” p. 27 (see lighting instruction

plate ).

8. Check the burner adjustment (see “Primary Air Shutter

Adjustment,” p. 30).

9. Check all gas control valves and pipe connections for

leaks.

10. Check the operation of the automatic gas valve by

lowering the setting of the thermostat, stopping the

operation of the gas unit heater. The gas valve should

close tightly, completely extinguishing the flame on

the main burners.

11. Inspect and service the motor/fan assemblies. To

maintain efficient air flow, inspect and clean the fan

blades and guard to prevent buildup of foreign matter.

WARNING

Hazardous Service Procedures!

The maintenance and troubleshooting procedures

recommended in this section of the manual could

result in exposure to electrical, mechanical or other

potential safety hazards. Always refer to the safety

warnings provided throughout this manual concerning

these procedures. When possible, disconnect all

electrical power including remote disconnect and

discharge all energy storing devices such as capacitors

before servicing. Follow proper lockout/tagout

procedures to ensure the power can not be

inadvertently energized. When necessary to work with

live electrical components, have a qualified licensed

electrician or other individual who has been trained in

handling live electrical components perform these

tasks. Failure to follow all of the recommended safety

warnings provided, could result in death or serious

injury.

WARNING

Hazardous Voltage and Gas!

Turn off the gas supply and disconnect all electric

power, including remote disconnects before servicing

unit. Follow proper lockout/tagout procedures to

ensure the power can not be inadvertently energized

and the gas can not be inadvertently turned on. Failure

to turn off gas or disconnect power before servicing

could result in death or serious injury.

WARNING

Hazard of Explosion!

Never use an open flame to detect gas leaks. Explosive

conditions may occur. Use a leak test solution or other

approved methods for leak testing. Failure to follow

recommended safe leak test procedures could result in

death or serious injury or equipment or property-only-

damage.

WARNING

Combustible Materials!

Maintain proper clearance between the unit heat

exchanger, vent surfaces and combustible materials.

Refer to unit nameplate and installation instructions for

proper clearances. Improper clearances could result in a

fire hazard. Failure to maintain proper clearances could

result in death or serious injury or property damage.

Maintenance

34 GHND-SVX01C-EN

12. Check lubrication instructions on the motor. If oiling is

required, add 3 to 4 drops of electric motor oil as

follows:

a. Light Duty—After 3 years or 25,000 hours of

operation.

b. Average Duty—Annually after 3 years or

8,000 hours of operation.

c. Heavy Duty—Annually after 1 year or at least every

1,500 hours of operation.

13. Check and test the operational functions of all safety

devices supplied with your unit.

NOTICE:

Equipment Damage!

Never over oil the motor or premature failure could

occur!

Maintenance

GHND-SVX01C-EN 35

Figure 23. Power venter assembly

Notes:

1. For item No. 6, use counter-clockwise rotation.

2. DO NOT OVERTIGHTEN CELCON NUT! HAND TIGHTEN ONLY! DO NOT USE TOOLS! Approximate 1/3 turn maximum or 8 inch pounds is sufficient from

the point where the tube does not slip in or out.

3. Flue Sizes:

100/175 units: 4” dia. flue outlet Reducer required—to be supplied by installer.

200/250 units: 5” dia. flue outlet (no adapter required).

300/400 units: 6” dia. flue outlet Increaser required—to be supplied by manufacturer.

Ref. No. Description

1 Blower Housing Assembly

2Speed Nut

3 Motor

4 Washer, Plain

5 Plate Adapter

6 Blower Wheel (see Note 1)

7 Mounting Bracket (Pressure Switch)

8 Mounting Bracket (Junction Box)

9Screw, S.T.

10 Screw, Machine (L = 3/4”)

11 Nut, Keps (Ext. Lock Washer)

12 Air Pressure Switch

13 Drill Screw

14 Junction Box Cover

Ref. No. Description

15 Snap Bushing

16 Relay (Motor)

17 Draftor Stack Assembly

18 Tubing (Aluminum) Formation

19 Male Connector

20 Locknut

21 Hole Plug

22 Pressure Switch Cover

23 Drill Screw

24 Junction Box Base

25–28 Power Connection

Maintenance

36 GHND-SVX01C-EN

Installation Instructions for Field

Replacement of Power Venter Motor

Important: This replacement must be performed only

by a qualified technician.

Note: All hardware (screws, nuts, washers) that will be

removed from the unit will be reused for this motor

replacement. DO NOT LOSE ANY OF THESE

PARTS.

Tools and Parts Needed

Wire Stripper and Crimper; Slotted Head and #2 Phillips

Head Screwdriver; 3/8-in. Wrench; 1/8-in. Allen Wrench

(long handle); marker; (1) 1/4-in. push on terminal for Wire.

Notes:

•Remove the cover from the Relay Junction Box (Item 1)

by removing two screws (Item 2) top and bottom.

Disconnect both wires from the motor lead ends. One

is connected to terminal #4 on the venter relay, and the

other is connected with a wire nut to a black wire.

•Remove the sensing tube (Item 3) from the Pressure

Switch/Mounting Bracket (Item 3) at motor end only.

Separated Combustion Units: Remove both tubes at

motor end only—note location.

•Mark locations of the Relay Junction Box and Pressure

Switch Mounting Brackets along with the Motor (Item

10) mounts on the Mounting Adapter Plate (Item 4)—

using a marker.

•Remove nut (Item 5) that secures the Motor Support

Shipping Bracket (Item 6) to the Mounting Adapter

Plate. Pull this bracket away from the Motor Mounting

Adapter Plate.

•Remove three phillips head screws (Item 7) on the

Motor mounting Adapter Plate. Remove the Motor/

Blower Wheel/Adapter Plate assembly from the Power

Venter Blower Housing (Item 8).

•Remove the Blower Wheel (Item 9) from the motor

shaft by removing the set screw (Item 14) using a 1/8-in.

Allen Wrench.

•Remove the three Motor Mounting Nuts (Item 5),

Space Washers (Item 11), and Screws (Item 12). Do not

lose these parts! Using caution—the motor will

disengage from the Mounting Adapter Plate, along

with the Relay Junction Box and Pressure Switch

Mounting Brackets will also disengage.

•Reverse order to install the new Power Venter Motor.

•TEST FIRE THE UNIT FOR A FEW CYCLES, MAKING

SURE THAT THE UNIT IS OPERATING

SATISFACTORILY.

Figure 24. Identification of parts

Ref. No. Description

1 Relay Junction Box/Mounting

Bracket Assembly

2 #8 Drill Screws (2 required)

3 Pressure/Mounting Bracket

Assembly

4 Mounting Plate Adapter

5 Keps Nut w/External Tooth

Lockwasher (4 required)

6 Motor Support Shipping Bracket

7 Phillips Head Screws (3 required)

8 Power Venter Blower Housing

9Blower Wheel

10 Motor

11 Space Washers (3 required)

12 Machine Screw (3 required)

13 Sensing Tube

14 Set Screw

Maintenance

GHND-SVX01C-EN 37

How to Order Replacement Parts

Please send the following information to your local Parts

center; If further assistance is needed, contact the

manufacturer’s customer service department.

•Model number

• Serial Number

• Part description and Number as shown in the

Replacement Parts Catalog.

38 GHND-SVX01C-EN

Diagnostics

Troubleshooting

WARNING

Hazardous Service Procedures!

The maintenance and troubleshooting procedures

recommended in this section of the manual could result

in exposure to electrical, mechanical or other potential

safety hazards. Always refer to the safety warnings

provided throughout this manual concerning these

procedures. When possible, disconnect all electrical

power including remote disconnect and discharge all

energy storing devices such as capacitors before

servicing. Follow proper lockout/tagout procedures to

ensure the power can not be inadvertently energized.

When necessary to work with live electrical

components, have a qualified licensed electrician or

other individual who has been trained in handling live

electrical components perform these tasks. Failure to

follow all of the recommended safety warnings

provided, could result in death or serious injury.

Table 7. Troubleshooting guide

Symptoms Possible Cause(s) Corrective Action

A. Flame lifting from burner ports. 1. Pressure regulator set too high. 1. Reset manifold pressure. Refer to “Operation,” p. 27.

2. Defective regulator. 2. Replace regulator section of combination gas valve or

complete valve.

3. Burner orifice too large. 3. Check with local gas supplier for proper orifice size and

replace. Refer to “Operation,” p. 27.

B. Flame pops back. 1. Excessive primary air. 1. Close air shutter. Refer to “Operation,” p. 27.

2. Burner orifice too small. 2. Check with local gas supplier for proper orifice size and

replace. Refer to “Operation,” p. 27.

C. Noisy flame. 1. Too much primary air. 1. Close air shutter.

2. Noisy pilot. 2. Reduce pilot gas. Refer to “Operation,” p. 27.

3. Irregular orifice causing whistle or

resonance. 3. Replace orifice.

4. Excessive gas input. 4. Reset manifold pressure. Refer to “Operation,” p. 27;

Replace regulator section of combination gas valve or

complete valve; or check with local gas supplier for proper

orifice size and replace. Refer to “Operation,” p. 27.

D. Yellow tip flame (some yellow

tipping on propane gas is

permissible).

1. Insufficient primary air. 1. Open air shutters. Refer to “Operation,” p. 27.

2. Clogged main burner ports. 2. Clean main burner ports.

3. Misaligned orifices. 3. Replace manifold assembly.

4. Clogged flue collector. 4. Clean flue collector.

5. Air shutter linted. 5. Check for dust or lint at air mixer opening and around the

air shutter.

6. Insufficient combustion air. 6. Clean combustion air inlet openings in bottom panel; see

“Installation: Piping,” p. 16.

E. Floating flame. 1. Blocked venting. 1. Clean flue. Refer to “Installation: Piping,” p. 16.

2. Insufficient combustion air. 2. Clean combustion air inlet openings in bottom panel; see

“Installation: Piping,” p. 16.

3. Blocked heat exchanger. 3. Clean heat exchanger.

4. Air leak into combustion chamber

or flue collector. 4. Determine cause and repair accordingly.

Diagnostics

GHND-SVX01C-EN 39

F. Gas Odor. 1. Shut off gas supply

immediately!

1. Inspect all gas piping and repair.

2. Blocked heat exchanger/venting. 2. Clean heat exchanger/flue.

3. Drafts around heater. 3. Eliminate drafts. Refer to “Installation: Mechanical,” p. 12.

4. Negative pressure in building. 4. See “Installation: Piping,” p. 16.

5. Blocked flue collector. 5. Clean flue collector.

G. Delayed ignition. 1. Excessive primary air. 1. Close air shutter. Refer to “Operation,” p. 27.

2. Main burner ports clogged near

pilot. 2. Clean main burner ports.

3. Pressure regulator set too low. 3. Reset manifold pressure. Refer to “Operation,” p. 27.

4. Pilot decreases in size when main

burners come on. 4. Supply piping is inadequately sized. Refer to “Installation:

Piping,” p. 16.

5. Pilot flame too small. 5. Clean pilot orifice. Refer to “Operation,” p. 27.

6. Drafts around heater. 6. Eliminate drafts. Refer to “Installation: Mechanical,” p. 12.

7. Improper venting. 7. Refer to “Installation: Piping,” p. 16.

H. Failure to ignite. 1. Main gas off. 1. Open all manual gas valves.

2. Lack of power at unit. 2. Replace fuse or turn on power supply.

3. Thermostat not calling for heat. 3. Turn up thermostat.

4. Defective limit switch. 4. Check limit switch with continuity tester. If open, replace

limit switch.

5. Improper thermostat or

transformer wiring. 5. Check wiring per diagrams.

6. Defective gas valve. 6. Replace gas valve.

7. Defective thermostat. 7. Check thermostat and replace if defective.

8. Defective transformer. 8. Be sure 115 volts is supplied to the transformer primary,

then check for 24 volts at secondary terminal before

replacing.

9. Loose wiring. 9. Check and tighten all wiring connections per diagrams.

10. Defective ignition control. 10. Replace, if necessary. Also see U, V, and W symptoms.

I. Condensation of water vapor. 1. Improper venting 1. Refer to “Installation: Venting,” p. 18.

J. Burner won't turn off. 1. Poor thermostat location. 1. Relocate thermostat away from drafts.

2. Defective thermostat. 2. Replace thermostat.

3. Improper thermostat or

transformer wiring at gas valve. 3. Check wiring per diagrams.

4. Short circuit. 4. Check operation at valve. Check for short (such as staples

piercing thermostat wiring), and correct.

5. Defective or sticking gas valve. 5. Replace gas valve.

6. Excessive gas supply pressure. 6. Refer to “Installation: Piping,” p. 16.

K. Rapid burner cycling. 1. Loose electrical connections at gas

valve or thermostat. 1. Tighten all electrical connections.

2. Excessive thermostat heat

anticipator. 2. Adjust thermostat heat anticipator for longer cycles. Refer

to “Installation: Electrical,” p. 24.

3. Unit cycling on high limit. 3. Check for proper air supply across heat exchanger.

4. Poor thermostat location. 4. Relocate thermostat. (Do not mount thermostat on unit).

5. Draft on pilot. 5. Eliminate drafts. Refer to “Installation: Mechanical,” p. 12.

6. Defective ignitor control. 6. Replace ignitor.

7. Defective high limit switch. 7. Jumper high limit switch terminals 1 and 2. If burner

operates normally, replace switch.

L. Noisy. 1. Fan blades loose. 1. Replace or tighten.

2. Fan blades dirty. 2. Clean fan wheel.

3. Vibration isolators deteriorated. 3. Replace vibration isolators.

4. Bearings are dry. 4. Oil bearings on fan motor. (Refer to label on motor.)

M. Pilot will not light or will not stay

lit. 1. Main gas off. 1. Open all manual gas valves.

Table 7. Troubleshooting guide (continued)

Symptoms Possible Cause(s) Corrective Action

Diagnostics

40 GHND-SVX01C-EN

2. Pilot adjustment screw turned too

low on combination/automatic

main gas valve.

2. Refer to “Operation,” p. 27.

3. Air in gas line. 3. Purge air from gas supply.

4. Incorrect lighting procedure. 4. Follow lighting instruction label adjacent to gas valve.

5. Dirt in pilot orifice. 5. Remove pilot orifice. Clean with compressed air or solvent.

(Do not ream.)

6. Extremely high or low gas

pressure. 6. Refer to “Operation,” p. 27.

7. Defective thermocouple. 7. Check thermocouple connection, and replace if defective.

8. Drafts around unit. 8. Eliminate drafts. Refer to “Installation: Mechanical,” p. 12.

9. Pilot valve not opening (faulty

wiring). 9. Inspect and correct all wiring.

10. No spark (faulty wiring). 10. Inspect and correct ignition system wiring. See symptoms

U, V, and W.

11. Defective gas valve. 11. Replace.

N. Fan will not run. 1. Loose wiring. 1. Check and tighten all wiring connections per diagrams.

Thermostat wires tagged “W” and “G” must be connected

together (unless special thermostats are used; if so, see

thermostat wiring diagram, “Electrical Connections,” p. 24).

2. Defective motor overload

protector or defective motor. 2. Replace motor.

3. Defective fan switch. 3. Check for 24V across 1 and 3 terminals on fan time delay

switch. If 24V is present, jumper terminals numbered 2 and

4. If motor runs, the fan switch is defective and must be

replaced. If 24V is not present, check wiring per diagrams.

O. Fan motor turns on and off while

burner is operating. 1. Fan switch heater element

improperly wired. 1. Be sure fan switch heater terminals are connected per

diagrams.

2. Defective fan switch. 2. Replace fan switch.

3. Motor overload protector cycling

on and off. 3. Check motor amps against motor name plate rating, check

voltage, replace fan motor if defective.

4. Motor not properly oiled. 4. Refer to label on motor.

P. Fan motor will not stop. 1. Improperly wired fan control. 1. Check all wiring.

2. Main burners not lighting while

thermostat calls for heat. 2. Refer to H and N symptoms.

3. Defective fan switch. 3. Replace fan switch.

Q. Not enough heat. 1. Incorrect gas input. 1. Refer to “Operation,” p. 27.

2. Heater undersized. 2. This is especially true when the heated space is enlarged.

Have the heat loss calculated and compare to the heater

output (80 percent of input). Your gas supplier or installer

can furnish this information. If heater is undersized, add

additional heaters.

3. Thermostat malfunction. 3. Replace thermostat.

4. Heater cycling on limit control. 4. There should be NO ducts attached to the front of this

heater. Check air movement through heat exchanger. Check

voltage to fan motor. Clean fan blade and heat exchanger

and oil fan motor.

R. Too much heat. 1. Thermostat malfunction. 1. Replace thermostat.

2. Heater runs continuously. 2. Check wiring per diagrams; check operation at valve. Look

for short (such as staples piercing thermostat wiring), and

correct; replace gas valve. Refer to “Operation,” p. 27.

S. Cold air is delivered on start up. 1. Fan switch heater element

improperly wired. 1. Be sure fan switch heater terminals are connected per

diagrams.

T. Cold air is delivered during heater

operation. 1. Incorrect manifold pressure or

input. 1. Refer to “Operation,” p. 27.

2. Voltage to unit too high. 2. Check motor voltage with fan running. Should be 115 volts

AC.

3. Air throughput too high. 3. Refer to “Operation,” p. 27.

Table 7. Troubleshooting guide (continued)

Symptoms Possible Cause(s) Corrective Action

Diagnostics

GHND-SVX01C-EN 41

U. No Spark. 1. Thermostat not calling for heat. 1. Close thermostat contacts.

2. No low voltage. 2. Check for 24V across 24V terminals of S8600.

3. Spark gap closed or too wide. 3. Set gap to 0.1.

4. Broken or cracked ceramic on

spark electrode. 4. Replace pilot assembly.

V. Spark present but pilot does not

light. 1. Loose S8600 connections. 1. Check all connections, term. PV feeds 24V to pilot valve.

2. Improper gas pressure. 2. Check pressure—pressure that is either too high or too low

may cause a problem.

3. Is spark in pilot gas stream? 3. Spark should arc from electrode.

4. No pilot gas — do not use match to

test - presence of gas is easily

detected by the odor.

4. Check pilot line for kinks. Ensure there are no drafts.

W. Pilot lights — Main valve does not

energize. 1. Loose S8600 connections. 1. Check connections-term. MV feeds main valve.

2. Cracked or broken sensor

ceramic. 2. Replace pilot assembly.

3. Check sensor/spark lead for

continuity. 3. Replace if needed.

4. Measure 24 volts from term. MV to

term. MV/PV. 4. If present, replace main valve; if not, replace S8600 Igniter.

X. Hi-Limit switch tripping 1. Vertical run of flue is too short. 1. Lengthen vertical run of flue pipe (see “Installation:

Venting,” p. 18).

2. Unit is overfiring. 2. Burner orifice may be too large: verify/replace if required.

3. Air flow too low. 3. Increase air flow; check fan size. Check for proper voltage.

4. Defective switch. 4. Replace.

Y. Noisy power venter. 1. Power venter wheel loose. 1. Replace or tighten.

2. Power venter wheel dirty. 2. Clean power venter wheel.

3. Power venter wheel rubbing

housing. 3. Realign power venter wheel.

4. Bearings are dry. 4. Oil bearings on power venter motor. (Refer to label on

motor).

Z. Power venter will not run. 1. Lack of power at unit. 1. Replace fuse or turn on power.

2. Loose wiring. 2. Check and tighten all wiring connections per diagrams.

Thermostat wires tagged “W” and “G” must be connected

together (unless special thermostats are used; if so see

thermostat wiring diagram, “Electrical Connections,” p. 24).

3. Defective motor overload

protector or defective motor. 3. Replace motor.

4. Defective power venter relay. 4. Check for 24V across 1 and 3 terminals on fan relay. If 24V

is present, jumper terminals numbered 2 and 4. If motor

runs, the relay is defective and must be replaced. If 24V is

not present, check wiring per diagrams.

AA. Power venter motor turns on and

off while burner is operating. 1. Fan relay heater element

improperly wired. 1. Be sure relay terminals are connected per diagrams.

2. Defective venter relay switch. 2. Replace venter relay.

3. Motor overload protector cycling

on and off. 3. Check motor amps against motor name plate rating, check

voltage; replace power venter motor if defective.

4. Motor not properly oiled. 4. Refer to label on motor.

AB. Power venter motor will not stop. 1. Improperly wired venter relay. 1. Check all wiring.

2. Main burner not lighting while

thermostat calls for heat. 2. Refer to H and N symptoms.

3. Defective venter relay. 3. Replace venter relay.

Table 7. Troubleshooting guide (continued)

Symptoms Possible Cause(s) Corrective Action

42 GHND-SVX01C-EN

Wiring Diagrams

Figure 25. High Efficiency Propeller Fan

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leader in creating and sustaining safe, comfortable and energy efficient environments, Trane offers a broad

portfolio of advanced controls and HVAC systems, comprehensive building services, and parts.

For more information, visit www.Trane.com.

Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice.

We are committed to using environmentally

conscious print practices that reduce waste.

© 2012 Trane All rights reserved

GHND-SVX01C-EN 16 Mar 2012

Supersedes GHND-SVX01B-EN (01 Mar 2010)