Roberts Gorden Furnace UHD[X][S][R] 150 User Guide

Combat

UHD-Series

Tubular Duct Furnace

(Standard Range)

Installation, Operation

& Service Manual

Models UHD[X][S][R]

150, 175, 200, 225

250, 300, 350, 400

WARNING

Installer

Improper installation, adjustment, alteration, service

or maintenance can result in death, injury or property

damage. Read the Installation, Operation and Service

Manual thoroughly before installing or servicing

this equipment.

Please take the time to read and understand

these instructions prior to any installation.

Installer must give a copy of this manual to the owner.

Owner

Installation must be done by a contractor qualified

in the installation and service of gas-fired heating

equipment or your gas supplier.

Keep this manual in a safe place in order to provide

your serviceman with necessary information.

Roberts-Gordon LLC

1250 William Street

P.O. Box 44

Buffalo, New York 14240-0044

Telephone: 716.852.4400

Fax: 716.852.0854

Toll Free: 800.828.7450

www.rg-inc.com

Quality in Any Language™

P/N 113001NA 11/08 Orig.

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TABLE OF CONTENTS

SECTION 1: Heater Safety......................................................1 SECTION 10: Operation and Maintenance ..........................21

1.1 Manpower Requirements .............................................1

SECTION 2: Installer Responsibility .....................................2

2.1 Wall Tag.......................................................................2

10.1 Pre-Start-Up Checks ................................................21

10.2 Begin Start-Up .........................................................21

10.3 Complete Start-Up ...................................................23

2.2 Corrosive Chemicals....................................................2 SECTION 11: User Instructions............................................24

2.3 National Standards and Applicable Codes ..................2

SECTION 3: Critical Considerations .....................................3

3.1 Basic Information.........................................................3

3.2 Manufactured Units......................................................3

11.1 User Instructions.......................................................24

11.2 Heater Operation ......................................................24

11.3 Lighting Instructions..................................................24

11.4 Simple Troubleshooting.............................................24

3.3 Location and Suspension ............................................3 SECTION 12: Servicing.........................................................25

3.4 Minimum Required Installation Clearances .................3

3.5 Clearances to Combustibles........................................3

3.6 Ventilation ....................................................................4

3.7 Gas Supply..................................................................4

3.8 Electrical Supply..........................................................4

3.9 Vent..............................................................................4

SECTION 4: National Standards and Applicable Codes .....5

12.1 Servicing Instructions...............................................25

12.2 Burner Maintenance.................................................25

12.3 Heat Exchanger Maintenance..................................25

12.4 Gas Valve Maintenance ...........................................25

12.5 Flue Blower ..............................................................25

12.6 Venting and Air Intake Pipe......................................25

12.7 Maintenance Checklist.............................................26

4.1 Gas Codes...................................................................5 SECTION 13: Troubleshooting .............................................28

4.2 Aircraft Hangars ...........................................................5

4.3 Parking Structures and Repair Garages......................5

4.4 Electrical......................................................................5

4.5 Venting.........................................................................5

4.6 High Altitude ................................................................6

SECTION 5: Duct Heater Installation.....................................7

13.1 General ....................................................................28

13.2 Troubleshooting For Automatic Ignition Burner

Systems ...................................................................29

13.3 Troubleshooting for Flame Supervision System .......30

13.4 Troubleshooting for Gas Valves................................31

13.5 Troubleshooting for Flue Blower...............................31

5.1 General........................................................................7 SECTION 14: Replacement Parts.........................................32

5.2 Suspension..................................................................8

SECTION 6: Venting................................................................9

6.1 Changing Vent and Air Intake Orientation....................9

6.2 Venting.........................................................................9

6.3 Vent Installation ...........................................................9

6.4 Unvented Operation................................................... 10

6.5 Horizontal Venting...................................................... 10

6.6 Vertical Venting.......................................................... 10

14.1 Gas Valve.................................................................32

14.2 Burner Compartment ...............................................33

14.3 Ignition Electrode and Flame Probe.........................34

14.4 Heat Exchanger .......................................................35

14.5 Flue Blower .............................................................35

14.6 Pressure Switch........................................................36

14.7 Ignition Control.........................................................36

14.8 Limit Switches ..........................................................36

6.7 Length Requirements ................................................ 10 SECTION 15: Specifications.................................................37

6.8 Vent Material.............................................................. 11

6.9 Replacing an Existing Heater in a Venting System.... 11

SECTION 7: Air Supply......................................................... 15

15.1 Dimension Data........................................................37

15.2 General Technical Data Table ..................................38

15.3 Technical Data Table ................................................38

7.1 Separated Combustion Installation............................. 15 SECTION 16: The ROBERTS GORDON^®COMBAT^®

7.2 Unvented Installation.................................................. 15

7.3 Building Ventilation..................................................... 15

7.4 Outside Combustion Air Supply.................................. 15

SECTION 8: Gas Piping........................................................ 16

8.1 Connections............................................................... 16

SECTION 9: Wiring................................................................ 17

9.1 Positioning Thermostats ............................................ 17

9.2 Low Voltage Thermostat with One Heater ................. 17

9.3 Internal Wiring Diagram............................................. 18

9.4 Ladder Wiring Diagram.............................................. 19

9.5 Electrical Connection to the Heater ...........................20

UHD-Series Warranty.....................................39

Roberts-Gordon LLC

or copied in any form or by any means - graphic, electronic, or mechanical, including

photocopying, recording, taping or information storage and retrieval systems - without the

written permission of Roberts-Gordon LLC.

Printed in U.S.A.

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TABLE OF FIGURES

Figure 1: Clearances to Combustibles ......................................3

Figure 2: Air Flow Direction.......................................................7

Figure 3: Suspension Methods .................................................8

Figure 4: Vent and Roof Detail................................................ 11

Figure 5: Standard Vented Heater - Vertical and Horizontal

Vent Termination...................................................... 12

Figure 6: Standard Vented Heater - Common Vertical Vent

Termination.............................................................. 12

Figure 7: Separated Combustion Heater - Vertical and

Horizontal Vent Termination..................................... 13

Figure 8: Concentric Vent Box ................................................ 13

Figure 9: Concentric Vertical and Horizontal Vent Termination -

Separated Combustion Heater ................................ 14

Figure 10: Gas Connection ..................................................... 16

Figure 11: Automatic Burner Control Sequence......................22

Figure 12: Gas Valve...............................................................22

Figure 13: LED Diagnostic Codes...........................................24

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SECTION 1: HEATER SAFETY

Your Safety is Important to Us!

This symbol is used throughout

the manual to notify you of

possible fire, electrical or burn

hazards. Please pay special

attention when reading and

following the warnings in these

sections.

Installation, service and quarterly

inspection of heater must be done by a contractor

qualified in the installation and service of gas-fired

heating equipment.

Read this manual carefully before installation,

operation or service of this equipment.

Heaters are not approved for residential installation.

These instructions, the layout drawing, local codes

and ordinances and applicable standards that apply

to gas piping, electrical wiring, venting, etc. must be

thoroughly understood before proceeding with the

installation.

Protective gear is to be worn during installation,

operation and service. Thin sheet metal parts,

including the various venting components, have

sharp edges. To prevent injury, the use of work

gloves is recommended.

Before installation, check that the local distribution

conditions, nature of gas and pressure and

adjustment of the appliance are compatible.

1.1 Manpower Requirements

To prevent personal injury and damage to the

heater, two persons will be required for installation.

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UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 2: INSTALLER RESPONSIBILITY

The installer is responsible for the following:

2.2 Corrosive Chemicals

• To install the heater, as well as the gas and

electrical supplies, in accordance with applicable

specifications and codes. Roberts-Gordon

recommends the installer contact a Local

Building Inspector or Fire Marshal for guidance.

Caution: Do not use heater in an area containing

corrosive chemicals. Avoid the use of corrosive

chemicals to ensure a longer life of the burner, heat

exchanger and other parts.

Roberts-Gordon cannot be responsible for ensuring

that all appropriate safety measures are undertaken

prior to installation; this is entirely the responsibility

of the installer. It is essential that the contractor, the

sub-contractor, or the owner identifies the presence

of combustible materials, corrosive chemicals or

halogenated hydrocarbons* anywhere in the

premises.

• To use the information given in a layout drawing

and in the manual together with the cited codes

and regulations to perform the installation.

• To install the heater in accordance with the

clearances to combustibles.

• To furnish all needed materials not furnished as

standard equipment.

• To plan location of supports, vents and air

intakes.

* Halogenated Hydrocarbons are a family of chemical

compounds characterized by the presence of halogen ele-

ments (fluorine, chlorine, bromine, etc.). These compounds are

frequently used in refrigerants, cleaning agents, solvents, etc. If

these compounds enter the air supply of the burner, the life

span of the heater components will be greatly reduced. An out-

side air supply must be provided to the burners whenever the

presence of these compounds is suspected. Warranty will be

invalid if the heater is exposed to halogenated hydrocarbons.

• To provide access for servicing.

• To provide the owner with a copy of this

Installation, Operation and Service Manual.

• To never use heater as support for a ladder or

other access equipment and never hang or

suspend anything from heater.

2.3 National Standards and Applicable Codes

All appliances must be installed in accordance with

the latest revision of the applicable standards and

national codes. This refers also to the electric, gas

and venting installation. Note: Additional standards

for installations in public garages, aircraft hangars,

etc. may be applicable.

• To ensure there is adequate air circulation

around the heater and to supply air for

combustion, ventilation and distribution in

accordance with local codes.

• To provide a method that ensures that the air flow

through the heat exchanger is within the

acceptable range indicated on the rating plate

prior to energizing the heater, and that such air

flow continues at least 90 seconds after the

heater is de-energized.

2.1 Wall Tag

A laminated wall tag is included with the heater as a

permanent reminder of the safety instructions and

the importance of the required clearances to

combustibles. Affix the tag by peeling off the backing

of the adhesive strips on the rear surface and

position the tag on a wall near the heater.

A copy of the wall tag (P/N 91039831) is illustrated

on the back cover.

Know your model number. Model number is found

on the heater and throughout the Installation,

Operation and Service Manual.

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SECTION 3: CRITICAL CONSIDERATIONS

3.1 Basic Information

3.5 Clearances to Combustibles

UHD[X][S][R] heaters have automatic ignition

burners for ON/OFF operation only.

WARNING

3.2 Manufactured Units

Gas-fired, power-vented duct furnace with tubular

heat exchanger. Units shall have a minimum of 82%

thermal efficiency. The standard unit shall consist of

a non-separated combustion design with an

aluminized heat exchanger. Design and heat

exchanger alternatives shall be offered as follows:

Fire Hazard

Some objects can catch fire or explode

when placed close to heater.

• Separated Combustion: A separated

combustion unit shall feature an enclosed,

sealed burner box. A piece of flexible air duct

connects this burner box to a flange on the

cabinet. Combustion air should be ducted from

outside the heated space, with the ductwork

connecting to the unit with the use of the flange.

Keep all flammable objects, liquids and

vapors the required clearances to

combustibles away from heater.

Failure to follow these instructions can

result in death, injury or property damage.

• Stainless Steel Heat Exchanger: A stainless

steel heat exchanger unit shall consist of heat

exchanger tubes, heat exchanger tube supports,

heat exchanger tube plates and vent box

produced of 409 stainless steel.

Clearances must be as indicated on Page 3, Figure

1. If clearances to combustibles are not indicated,

then installation clearances apply.

Figure 1: Clearances to Combustibles

3.3 Location and Suspension

All models:

• Must be installed indoors.

(15 cm)

• Must be installed on the positive pressure side of

the air circulation blower.

31"*

(79 cm)

(15 cm)

• Must be installed in a level position with

horizontal discharge.

(15 cm)

• May be mounted on a shelf of non-combustible

material.

• May be suspended from above (See Page 8,

Figure 3) or from wall brackets of sufficient

strength to support the heater as listed in the

Dimension Data Table on Page 37, Section 15.1.

Clearance to Vent: 2" (5 cm)

*31" (79 cm) minimum is necessary

for servicing.

• Must be installed in a manner which allows

access to all serviceable components.

See Page 3, Figure 1 for details.

3.4 Minimum Required Installation Clearances

Clearances around the heater and vent must be as

indicated on Page 3, Figure 1 and Page 11, Figure 4

through Page 14, Figure 9 to ensure access for

servicing, and correct operation.

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UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

3.6 Ventilation

3.8 Electrical Supply

WARNING

Carbon Monoxide Hazard

Heaters may be installed

vented or unvented.

Vented heaters must be

vented outdoors.

Electrical Shock Hazard

Unvented heaters must be

installed in buildings with

ventilation rates as per

section 6.4.

Disconnect electrical and gas supply before

servicing.

This appliance must be connected to a

properly grounded electrical source.

Failure to follow these

instructions can result in

death or injury.

Failure to follow these instructions can result

in death or electrical shock.

It is important to ensure that there is adequate air

space around the heater to supply air for

combustion, ventilation and distribution in

accordance with local and national codes on Page

9, Section 6.

A permanent 120 V / 1 Ø / 60 Hz electrical supply is

required for the main electrical power. The heater

also requires suitable controls in accordance with

Page 17, Section 9.

3.7 Gas Supply

3.9 Vent

Choose heater orientation to allow for proper

location of the vent. Each heater must be fitted with

a correctly sized sealed vent system.

If vented horizontally, no other appliance may be

connected to the vent. See Page 9, Section 6.

Fire Hazard

Connect gas supply according to Figure 10.

Do not use gas supply pipe and electrical

connections to support heater’s weight.

Gas can leak if not installed properly.

Failure to follow these instructions can

result in death, injury or property damage.

It is important that the gas supply pipe is sized

correctly to provide the inlet pressure as stated on

the heater data plate. The gas supply pipe and

electrical connections must not support any of the

heater's weight. See Page 16, Section 8.

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SECTION 4: NATIONAL STANDARDS AND APPLICABLE CODES

4.1 Gas Codes

4.3 Parking Structures and Repair Garages

The type of gas appearing on the name plate

must be the type of gas used. Installation must

comply with national and local codes and

requirements of the local gas company.

Installation in garages must be in accordance

with the following codes:

United States: Standard for Parking Structures

NFPA 88A - latest revision or the Code for

Motor Fuel Dispensing Facilities and Repair

Garages, NFPA 30A - latest revision. Canada:

Refer to CSA B149.1 Natural Gas and Propane

Installation Code.

United States: Refer to NFPA 54/ANSI Z223.1 -

latest revision, National Fuel Gas Code.

Canada: Refer to CSA B149.1 Natural Gas and

Propane Installation Code.

• In accordance with the Standard for Parking

Structures NFPA 88A, heaters must be located

a minimum of 18" (50 cm) below the floor-

ceiling assembly or 18" (50 cm) above the floor.

4.2 Aircraft Hangars

Installation in aircraft hangars must be in

accordance with the following codes:

• In accordance with the Code for Motor Fuel

Dispensing Facilities and Repair Garages,

NFPA 30A - latest revision, heaters must not be

installed less than 8' (2.4 m) above the floor.

United States: Refer to Standard for Aircraft

Hangars, NFPA 409 - latest revision.

Canada: Refer to Standard CSA B149.1

Natural Gas and Propane Installation Code.

4.4 Electrical

• In aircraft storage and servicing areas,

heaters shall be installed at least 10' (3 m)

above the upper surface of wings or of engine

enclosures of the highest aircraft which may be

housed in the hangar. The measurement shall

be made from the wing or engine enclosure

(whichever is higher from the floor) to the

bottom of the heater.

The heater must be electrically grounded in

accordance with the following codes:

United States: Refer to National Electrical

Code^®, NFPA 70 - latest revision. Wiring must

conform to the most current National Electrical

Code^®, local ordinances and any special

diagrams furnished.

• In shops, offices and other sections of aircraft

hangars communicating with aircraft storage or

servicing areas, heaters shall be installed not

less than 8' (2.4 m) above the floor.

Canada: Refer to Canadian Electrical Code,

CSA C22.1 Part 1 - latest revision.

• Suspended or elevated heaters shall be so

located in all spaces of aircraft hangars that

they shall not be subject to injury by aircraft,

cranes, movable scaffolding or other objects.

Provisions shall be made to assure

4.5 Venting

The venting must be installed in accordance

with the requirements within this manual and

the following codes:

United States: Refer to NFPA 54/ANSI Z223.1 -

latest revision, National Fuel Gas Code.

accessibility to suspended heaters for recurrent

maintenance purposes.

Canada: Refer to CSA B149.1 Natural Gas and

Propane Installation Code.

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UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

4.6 High Altitude

These heaters are CSA-approved (without

modifications) for installations up to 2000' (610

m) in US and Canada. CSA approved heaters

installed above 2000' (610 m) must be de-rated.

For installations above 2000' (610 m) in US,

consult factory for information on burner de-

rating. For installations from 2000' (610 m) to

4500' (1370m) in Canada, high altitude

conversion kits are available. Heaters installed

over 4500' (1370 m) in Canada are not CSA-

approved and must be approved by the local or

provincial authority.

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SECTION 5: DUCT HEATER INSTALLATION

5.1 General

range shown on Page 7, Section 5.1.2. The minimum

inlet duct lengths shown on Page 7, Section 5.1.1

must be observed. Pressure drop through the heat

exchanger at various air flows is shown on Page 7,

Section 5.1.2.

To connect the inlet and outlet ducts to the heater,

Duct-Mate or similar flanges may be slid over the

duct connector flanges supplied on the unit and

secured with screws. The connection to the duct

then can be made using the Duct-Mate clips. The

ducts must have removable access panels

upstream and downstream of the heater. These

panels must be of appropriate size and placement

so that smoke or reflected light could be observed to

indicate the presence of leaks in the heat

Figure 2: Air Flow Direction

exchanger. Covers for these openings should be

sealed to prevent leakage.

Any transition into the inlet of the heater should be

smooth, with a taper of no more than 15°. If elbows

are required, they should be of either broad radius

or fitted with properly designed air turns. Consult a

professional to ensure air turns are properly

designed.

The heater must be installed on the positive

pressure side of the circulating air blower. Air flow

through the heater must be as shown on Page 7,

Figure 2 and may not be reversed. The air flow must

be adjusted such that it is within the acceptable

5.1.1 Minimum Inlet Duct Length

Model

Duct Length

52" (132 cm)

60" (162 cm)

75" (190 cm)

Duct Size (W X H)

UHD[X][S][R] 150-175

UHD[X][S][R] 200-250

UHD[X][S][R] 300-400

28" x 24" (71 cm x 60 cm)

28" x 32 1/4" (71 cm x 103 cm)

28" x 40 1/2" (71 cm x 82 cm)

5.1.2 Temperature Rise and Pressure Drop Ranges

UHD[X][S][R] 150

Pressure

UHD[X][S][R] 175

Pressure

UHD[X][S][R] 200

Pressure

UHD[X][S][R] 225

Pressure

Airflow Temperature

(CFM)

Airflow Temperature

(CFM)

Airflow Temperature

(CFM)

Airflow Temperature

(CFM)

Drop

(in wc)

0.02

Drop

(in wc)

0.03

Drop

(in wc)

0.025

0.035

0.056

0.100

0.129

0.163

Drop

(in wc)

0.035

0.052

0.110

Rise (°F)

1,360

1,950

2,800

3,700

4,700

5,800

1,400

2,180

3,244

4,370

5,160

6,850

2,050

2,600

3,600

5,500

6,570

7,750

23.5

2,100

2,800

4,600

6,230

7,400

8,300

0.035

0.057

0.083

0.12

0.06

0.10

0.15

0.19

0.167

0.214

0.253

0.16

0.29

UHD[X][S][R] 250

UHD[X][S][R] 300

UHD[X][S][R] 350

UHD[X][S][R] 400

Pressure

Drop

(in wc)

0.05

0.07

0.13

0.19

0.28

0.35

Pressure

Drop

(in wc)

0.02

0.06

0.12

0.17

0.22

0.27

Pressure

Drop

(in wc)

0.03

0.07

0.123

0.23

Pressure

Drop

(in wc)

0.04

0.08

0.13

0.21

0.36

0.53

Airflow Temperature

(CFM)

Rise (°F)

(CFM)

Rise (°F)

(CFM)

Rise (°F)

(CFM)

Rise (°F)

2,350

3,000

4,400

5,900

7,625

8,850

2,700

4,735

6,813

8,000

9,300

10,200

3,120

4,880

6,612

9,140

10,500

13,600

3,420

5,200

6,700

8,850

11,600

14,200

0.30

0.48

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UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

5.1.3 Air Flow And Temperature Rise Ranges

Model

Rate

Air Flow

Maximum (CFM)

Temperature Rise

(Btu/h)

150,000

175,000

200,000

225,000

250,000

300,000

350,000

385,000

Minimum (CFM)

1,360

Minimum (°F)

Maximum (°F)

UHD[X][S][R] 150

UHD[X][S][R] 175

UHD[X][S][R] 200

UHD[X][S][R] 225

UHD[X][S][R] 250

UHD[X][S][R] 300

UHD[X][S][R] 350

UHD[X][S][R] 400

5,800

6,850

7,750

8,300

8,850

10,200

13,600

14,200

1,400

2,050

2,100

2,350

2,700

3,120

3,420

5.2 Suspension

When handling or supporting the heater from below,

ensure that the weight is taken at the support points.

For typical suspension, See Page 8, Figure 3.

WARNING

Crush Hazard

The gas or electrical supply lines must not be used

to support the heater.

Use 3/8" threaded rod

minimum.

Do not locate the gas or electrical supply lines

directly over the path of the flue products from the

heater.

Failure to follow these

instructions can result in

death, injury or property

damage.

The heater must be installed in a location that is

readily accesible for servicing.

Four suspension points (3/8" nuts) are located on

the top of the heater. Drop rods must be 3/8"

diameter mild steel.

The heater must be installed in accordance with

clearances to combustibles as indicated on the wall

tag and in this manual.

Figure 3: Suspension Methods

Ensure all suspension

hardware is torqued to

a minimum of 20 ft lbs.

Unistrut

Channel Nut

Washer

Nut

3/8"

Threaded

Rod

Cone Point

Set Pin

NOTE: Duct

supports

not shown.

Duct supports

and duct are

Window

Clamp

not provided by

manufacturer.

3/8"

Unistrut

Threaded

Rod

Nut

Washer

Riv

Nut

Support Points

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SECTION 6: VENTING

tape or silicone sealant must be used to seal all

joints.

WARNING

Aluminum tape shall have a minimum temperature

rating of 400° F (204° C) and meet SMACNA AFTS-

100-73 standards. High temperature silicone sealant

must have a minimum temperature rating of 480° F

(250° C).

Carbon Monoxide Hazard

Heaters may be installed

vented or unvented.

Vented heaters must be

vented outdoors.

6.2.1 United States Requirements

Unvented heaters must be

installed in buildings with

ventilation rates as per

section 6.4.

Vent must terminate at least 3' (.9 m) above any

forced air inlet located within 10' (3.1 m).

Vent must terminate at least 4' (1.2 m) below,

4' (1.2 m) horizontally from, or 1' (.3 m) above any

door, operable window, or gravity air inlet into any

building.

Failure to follow these

instructions can result in

death or injury.

NFPA 54/ANSI Z223.1 - latest revision, National

Fuel Gas Code specifies a 4' (1.2 m) horizontal vent

terminal clearance from gas and electric meters,

regulators and relief equipment.

6.1 Changing Vent and Air Intake Orientation

The heater is sold with rear horizontal vent and air

intake connections. (Only separated combustion

models have air intake connection.)

6.2.2 Canadian Requirements

6.2 Venting

The vent shall not terminate within 6' (1.8 m) of a

mechanical air supply inlet to any building.

This heater must be vented in accordance with the

rules contained in this manual and with the following

national codes and any state, provincial or local

codes which may apply: United States: Refer to

NFPA 54/ANSI Z223.1 - latest revision, National

Fuel Gas Code; Canada: Refer to CSA B149.1

Natural Gas and Propane Installation Code.

Any portion of vent pipe passing through a

combustible wall must have a listed thimble to

conform with the above codes.

The vent shall not terminate within 3' (.9 m) of a

window or door that can be opened in any building,

any non-mechanical air supply inlet to any building,

or of the combustion air inlet of any other appliance.

6.3 Vent Installation

Maintain clearances to combustibles at all times for

safety. Clearances are the required distances that

combustible objects must be away from the heater

to prevent serious fire hazard. See Page 3, Section

3.5. For vented units, the vent must terminate

outside of the building.

Vents must be fully sealed and correctly sized for

the model. If the vent passes through a wall or

ceiling of combustible material, it must be enclosed

by a listed thimble and be separated from the

thimble by at least a 2" (5 cm) air gap.

For separated combustion models, vents and air

intakes must be a fully sealed system and correctly

sized for the model. Vent should be assembled as

detailed on Page 11, Figure 4 through Page 14,

Figure 9. The joints between the vent terminal and

the roof or wall must be properly sealed. If the vent

passes through a wall or ceiling of combustible

material, it must be enclosed by a listed thimble and

be separated from the thimble by at least a 2" (5 cm)

air gap.

The heater may be installed unvented in

certain circumstances according to building

ventilation codes. Refer to the above codes and

Page 10, Section 6.4 for further information.

Unvented operation also requires compliance with

the clearances to combustibles given on Page 3,

Figure 1.

The bottom of the vent or air intake terminal shall not

be located less than 1' (.3 m) above grade level.

The vent shall not terminate less than 7' (2.1 m)

above grade where located adjacent to public

walkways.

Vent terminal must be installed at a height sufficient

to prevent blockage by snow and building materials

protected from degradation by flue gasses.

Vent terminal must be beyond any combustible

overhang.

Secure all joints with corrosion resistant #8 x 3/8"

sheet metal screws.

For single wall venting, pressure sensitive aluminum

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UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

Vents and air intakes must be adequately

supported so that the heater does not bear the

weight of the pipes.

States); 3 cfm per 1000 Btu/h firing rate (Canada).

WARNING: Combustion by-products contain a

For vent termination See Page 11, Figure 4 through chemical known to the State of California to cause

Page 14, Figure 9.

cancer and birth defects or other reproductive harm.

6.3.1 Standard Vented Heaters

(Models UHD[X][R] 150 - 400)

The vent must be fitted with a low resistance

terminal. See Page 11, Figure 4 through Page 12,

Figure 5. Standard vented heaters do not allow

outdoor air intake for combustion air.

6.5 Horizontal Venting

Horizontally vented heaters must be individually

vented.

Vent pipe must be sloped ¼" (.6 cm) downward for

every 1' (.3 m). For vent lengths greater than 5' (1.5

m), condensation will form. Insulation is

recommended and condensation drains may be

desired.

6.3.2 Separated Combustion Heaters

(Models UHD[X]S[R] 150 - 400)

In noncombustible walls only, vent terminal

(P/N 02537801-1P) may be used.

The heaters are designed to be installed as

separated combustion heaters. The vent and air

intake are run as separate pipes to the wall or roof

terminals. See Page 14, Figure 9. As an option, the

vent and air intake are run as separate pipes to a

concentric vent box and a concentric vent/air intake

pipe penetrates the wall or roof. See Page 13,

Figure 8 and Page 14, Figure 9.

For separated combustion installation, the vent and

air intake must be fitted with an individual and

correctly sized sealed system and the vent and air

intake must terminate at approved wall and roof

terminate at approved wall and roof terminals.

For 4'' (10 cm) vents in either combustible or

noncombustible walls, use vent terminal (P/N

90502100) or equivalent insulated vent terminal.

Follow the manufacturer's instructions for proper

installation.

Instead of an insulated vent terminal, a listed thimble

(with 2" (5 cm) air gap) may be used with a 4" (10

cm) vent cap (P/N 90502102).

6.6 Vertical Venting

Vertically-vented standard-vented heaters can be

common vented (up to four heaters).

For vent lengths greater than 5' (1.5 m),

condensation will form. Insulation is recommended

and condensation drains may be desired. Vent from

the rear of the heater cabinet then run the vent

vertically and use a condensate drain at the bottom

of the vertical vent.

Separated combustion units may not be common

vented. See Page 9, Section 6.

6.4 Unvented Operation

WARNING

Carbon Monoxide Hazard

Vent pipe must be sloped 1/4'' (.6 cm) for every

1' (.3 m).

Heaters may be installed

vented or unvented.

For 4'' (10 cm), an approved vent cap

(P/N 90502102) must be used.

Vented heaters must be

vented outdoors.

For 6'' (15 cm) common vent, an approved vent cap

(P/N 90502103) must be used.

Unvented heaters must be

installed in buildings with

ventilation rates as per

section 6.4.

For common vertical venting of more than two

heaters, See Page 12, Figure 6.

A vent shall not extend less than 2' (.6m) above the

highest point where it passes through a flat roof of a

building.

Failure to follow these

instructions can result in

death or injury.

6.7 Length Requirements

This heater is not approved to be installed in

residential buildings.

For unvented operation in commercial installations,

sufficient building ventilation must be provided in the

amount of 4 cfm per 1000 Btu/h firing rate (United

If using vent lengths greater than 5' (1.5 m),

condensation will form in the vent pipe. Insulation

and additional sealing measures (high temperature

silicone at all seams) are required.

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SECTION 6: VENTING

The entire vent should be insulated with foil faced

fiberglass insulation (1/2" thick, 1-1/2# density

minimum).

4. Follow the lighting instructions. Place the

appliance being inspected in operation.

Adjust thermostat so that the appliance will

operate continuously.

5. For any appliance having a draft hood, test for

draft hood appliance spillage at the draft hood

relief opening after five minutes of main burner

operation. Use the flame of a match or candle.

6. After it has been determined that each

appliance connected to the venting system

properly vents when tested as outlined above,

return doors, windows, exhaust fans, fireplace

dampers and any other gas-burning appliances

to their previous conditions of use.

7. If improper venting is observed during any of

the above tests, the venting system must be

corrected by a contractor qualified in the

installation and service of gas-fired equipment

or your local gas supplier. If the venting must

be resized, use appropriate tables in (US)

Appendix G of NFPA 54/ANSI Z223.1 - latest

revision, National Fuel Gas Code (US) or

Standard CSA B149.1 Natural Gas and

Propane Installation Code (Canada) to

6.7.1 Maximum Vent Lengths

Model UHD[X][S][R] 150 - 400

Number of Elbows

40 ft (12.2 m)

35 ft (10.7 m)

30 ft (9.1 m)

25 ft (7.6 m)

20 ft (6.1 m)

6.8 Vent Material

Vent material may be single wall 26 ga. (minimum)

galvanized steel or equal thickness stainless steel.

Completely seal all joints, refer to Page 9, Section

6.3.

If penetrating a combustible wall or roof, a listed

thimble with 2" (5 cm) clearance must be used.

Where local codes permit, a single section of type

B-1 vent material may be used at the roof or wall

penetration instead of a thimble. Ensure vent

manufacturer's clearance from vent material is

maintained. Seal annular space of the type B-1 vent

as well as all joints in the remaining vent.

determine minimum size. All vent corrections

must be in accordance with the appropriate

local codes and the NFPA 54/ANSI Z223.1 -

latest revision, National Fuel Gas Code (US) or

Standard CSA B149.1 Natural Gas and

Propane Installation Code (Canada).

6.9 Replacing an Existing Heater in a Venting

System

When replacing an existing heater in a venting

system, the venting system may not be properly

sized to vent the new heater. The following steps

must be followed with each appliance connected to

the venting system placed in operation, while any

other appliances connected to the venting system

are not in operation.

Figure 4: Vent and Roof Detail

1. Seal any unused openings in the venting

system.

2. Inspect the venting system for proper size and

horizontal pitch, as required by the NFPA 54/

ANSI Z223.1 - latest revision, National Fuel

Gas Code (US) or Standard CSA B149.1

Natural Gas and Propane Installation Code

(Canada) and these instructions. Determine

that there is no blockage or restriction, leakage,

corrosion and other deficiencies which could

cause an unsafe condition.

3. Close all building doors and windows and all

doors between the space in which the

appliance(s) connected to the venting system

are located and other spaces of the building.

Turn on clothes dryers and any exhaust fans,

such as range hoods and bathroom exhausts

so that they shall operate at maximum speed.

Do not operate a summer exhaust fan. Close

fireplace dampers.

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UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

Figure 5: Standard Vented Heater - Vertical and Horizontal Vent Termination

Model

Vent Diameter

Part Number

UHD[X][R] 150 - 400

4" (10 cm)

90502102

Figure 6: Standard Vented Heater - Common Vertical Vent Termination

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SECTION 6: VENTING

Figure 7: Separated Combustion Heater - Vertical and Horizontal Vent Termination

12" (31 cm) Minimum from air inlet to

vent termination (may be horizontal

NOTE: Vent supports not

or vertical clearance).

shown. Duct supports

not shown. Duct and

vent supports not

provided by the

12" (31 cm)

Minimum from

wall to vent

termination.

manufacturer.

Vent

12" (31 cm)

Air Intake*

Minimum from

air inlet to vent

termination (may be

horizontal or vertical

clearance).

Vertical

Option

Horizontal

Option

90°

Bend

Air Intake

Termination

Vent

Termination

Vent

Condensate

12" (31 cm)

Trap to Drain

(Optional)

Minimum from wall

to vent termination.

Model

UHD[X]S[R] 150 - 400

Model

UHD[X]S[R] 150 - 250

UHD[X]S[R] 300 - 400

Vent Diameter

4" (10 cm)

*Air Intake Diameter

4" (10 cm)

Terminal P/N

90502102

Terminal P/N

90502102

Listed Thimble

through Combustible

5" (13 cm)

90502105

Wall

Figure 8: Concentric Vent Box

4" (10 cm) or

5" (13 cm)

Toward

Outside

Seal joint between single wall

and Type B vent with

silicone sealant.

6" (15 cm) Single

Wall Inlet Air Pipe

(By Others)

Concentric

Combustion Air

to Heater

Vent Box

Use 3 sheetmetal

screws equally

spaced around joint.

Use 3 sheetmetal

screws equally

spaced around collar.

Exhaust

from Heater

4" (10 cm) Single

Wall Vent Pipe

(By Others)

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UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

Figure 9: Concentric Vertical and Horizontal Vent Termination - Separated Combustion Heater

Description

Part Number

UHVK1

Qty.

Model

UHD[X]S[R] 150 - 400

Model

UHD[X]S[R] 150 - 250

UHD[X]S[R] 300 - 400

Vent Diameter

4" (10 cm)

*Air Intake Diameter

4" (10 cm)

Concentric Vent Kit (150 - 250)

Concentric Vent Box Top & Side Assembly

Concentric Vent Box Bottom Assembly

Screw #6 x 3/8 Self Drilling

4" (10 cm) Vent Terminal with Baffle Plate

6" (15 cm) Combustion Air Terminal

90504113

90504112

91119100

90502102R

90502103

5" (13 cm)

Description

Part Number

UHVK2

Qty.

Concentric Vent Kit (300 - 400)

Concentric Vent Box Top & Side Assembly

Concentric Vent Box Bottom Assembly

Screw #6 x 3/8 Self Drilling

4" (10 cm) Vent Terminal with Baffle Plate

8" (20 cm) Combustion Air Terminal

90504013

90504012

91119100

90502102R

90502104

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SECTION 7: AIR SUPPLY

7.1 Separated Combustion Installation

When installed as a separated combustion heater

(UHD[X]S[R]), the air for combustion is drawn in

from outside the building.

7.2 Unvented Installation

It is important to ensure that there is adequate fresh

air supply at all times for both combustion and

heating requirements in accordance with local and

national codes.

WARNING: Combustion by-products contain a

chemical known to the State of California to cause

cancer and birth defects or other reproductive harm.

7.3 Building Ventilation

Where ventilation is required, air must be taken from

an outside point where it is not likely to be

contaminated or obstructed.

7.4 Outside Combustion Air Supply

If outside combustion air supply is required,

separated combustion model (UHD[X]S[R]) heaters

must be used.

Caution: If the building has a slight negative

pressure or corrosive contaminants such as

halogenated hydrocarbons are present in the air, an

outside combustion air supply to the heater is

required. Seal all combustion air pipe joints.

The flexible air duct may have to be insulated to

prevent condensation on the outer surface. The

outside air terminal must not be more than 1' (31

cm) above the vent terminal.

7.4.1 Length Requirements

Follow the constraints listed on Page 10, Section

6.7.

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UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 8: GAS PIPING

• Gas supply pipe work is run in medium or heavy

gauge tubing in compliance with local and

national codes.

• Meter and service must be large enough to

handle all the burners being installed plus any

other connected load. The gas pipe which feeds

the system must be large enough to supply the

required gas with a maximum pressure drop of

1/2" wc. When gas piping is not included in the

layout drawing, contact the local gas supplier.

Fire Hazard

Connect gas supply according to Figure 10.

• An isolating valve and union connection should

be used and fitted into the supply adjacent to the

heater.

• A minimum 1/8" NPT plugged tapping

accessible for test connection must be installed

immediately upstream of the gas supply

connection to the heater.

• For suspended heaters, an approved metal

flexible connection between the isolating valve

and the heater may be used. To reduce

pressure loss, use one pipe size larger than

the heater gas connection.

IMPORTANT - The complete installation must be

purged and tested for gas soundness in accordance

with local and national codes.

Do not use gas supply pipe and electrical

connections to support heater’s weight.

Gas can leak if not installed properly.

Failure to follow these instructions can

result in death, injury or property damage.

A gas meter is connected to the service pipe by the

gas supply company. An existing meter should be

checked, preferably by the company, to ensure that

the meter is adequate for the rate of gas supply

required.

Installation pipes must be fitted in accordance with

local and national codes. Pipes of smaller size than

the heater inlet gas connection should not be used.

Caution: Do not high pressure (in excess of 1/2 psi

[14" wc]) test the gas piping with the burner

connected. Close manual shut-off valve during any

pressure testing equal to or less than 1/2 psi (14"

wc).

8.1 Connections

Connect the heater to the gas supply ensuring that

the final connections are as follows:

Check the pipe and tubing ends for leaks before

placing heating equipment into service. When

checking for gas leaks, use a soap and water

solution; never use an open flame.

Figure 10: Gas Connection

• Hold gas nipple

securely with pipe

wrench when

attaching the flexible

gas connector.

Do not bend flexible

gas connector

sharply.

• Do not twist

flexible gas

connector.

• Ensure all

joints are

gas tight.

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SECTION 9: WIRING

Heater must be wired and electrically grounded in

accordance with local codes. In the absence of local

codes in accordance with: United States: refer to

National Electrical Code^®NFPA 70 - latest revision

Canada: refer to Canadian Electrical Code CSA

C22.1 Part I - latest revision.

WARNING

9.1 Positioning Thermostats

Electrical Shock Hazard

A room thermostat should be mounted on a

vibration-free wall or column at a height of

approximately 5' (1.5 m) from the floor to measure

the ambient temperature. It should be clear of both

cold drafts and the direct path of warm air from the

heater.

Avoid mounting thermostat on outside walls or in

areas directly exposed to radiant heat or sunlight.

Install wall tag in a visible location near thermostat.

See Page 2, Section 2.1 for wall tag details.

Disconnect electrical and gas supply before

servicing.

This appliance must be connected to a

properly grounded electrical source.

Failure to follow these instructions can result

in death or electrical shock.

All heater models require constant 120 V/1Ø/60 Hz

power supply. Check heater rating plate for electrical

rating for proper circuit sizing. For servicing, a

disconnect switch of proper electrical rating should

be installed in the vicinity of the heater.

All heaters are equipped with thermostat

connections suitable to power a 24 V thermostat.

9.2 Low Voltage Thermostat with One Heater

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UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

9.3 Internal Wiring Diagram

L2 L1

WHITE

BLACK

FLUE

BLOWER

GREEN

WHITE

GREEN

GAS VALVE

BLACK

TRANSFORMER

WHITE

GREEN

BLUE

YELLOW

BLUE

BROWN

PRESSURE SWITCH

BLUE

R = 24 VAC TO THERMOSTAT (RED)

ORANGE

LIMIT SWITCH (UHD 300, 350, 400 ONLY)

G = MANUAL FAN INPUT FROM THERMOSTAT (GREEN)

ORANGE

W = HEAT DEMAND INPUT FROM THERMOSTAT (WHITE)

ORANGE

C = COMMON GROUND TO THERMOSTAT

MANUAL RESET LIMIT SWITCH (RESIDENTAL UNITS ONLY)

LIMIT SWITCH

IGNITION MODULE

THERMOSTAT INPUT: FIELD SUPPLIED

SENSE

BLACK

ELECTRODE

CMB BLOWER

ACC

BLACK

IMPORTANT:

For field wiring into service junction box, or if any of the original wire supplied with the heater

must be replaced, it must be replaced with wiring material having a temperature rating of at least 105 °C

(221 °F) and 600 V. For supply connections, use No. 14 AWG or larger wires.

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SECTION 9: WIRING

9.4 Ladder Wiring Diagram

120 VAC

FLUE BLOWER

TRANSFORMER

GAS VALVE

PRESSURE SWITCH

FLAME

SENSOR

5 4

FLAME

IGNITION

MODULE

LIMIT SWITCH (UHD 300, 350, 400 ONLY)

LIMIT SWITCH

SPARK

ELECTRODE

MANUAL RESET LIMIT SWITCH

(UHD 75 - 125 ONLY)

THERMOSTAT CONNECTION

FLUE BLOWER

IMPORTANT:

For field wiring into service junction box, or if any of the original wire supplied with the heater

must be replaced, it must be replaced with wiring material having a temperature rating of at least 105 °C

(221 °F) and 600 V. For supply connections, use No. 14 AWG or larger wires.

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UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

9.5 Electrical Connection to the Heater

Flexible Conduit

BX Connector

Burner

Ground

Connect wires together

with suitable approved

wire connectors.

Junction Box

Green to Ground

White to L2

Black

White

Green

Black to L1

IMPORTANT: Junction box is not provided with heater.

Conduit can also be attached directly to heater with wire junction made within the heater cabinet.

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SECTION 10: OPERATION AND MAINTENANCE

10.2 Begin Start-Up

10.2.1 Before Operating the Heater

WARNING

To ensure that all the controls are in safe working

order, operate the heater for the first time with the

isolating gas valve turned off and power supply

turned on.

1. Turn off the isolating gas valve.

2. Turn up the thermostat above room

temperature. The automatic ignition

sequence will now begin as described

on Page 22, Figure 11.

There will be no ignition of the burner and lockout

will occur, which proves the controls are operating

correctly.

Explosion Hazard

Installation, service and annual inspection

must be done by a contractor qualified in

the installation and service of gas-fired

heating equipment or your gas supplier.

Turn off gas and electrical supplies before

performing service or maintenance.

Failure to follow these instructions can

result in death, injury or property damage.

Read this manual carefully before installation,

operation, or service of this equipment. All

components are accessed via the door secured by

four sheet metal screws. Opening the door exposes

live electrical connections and hot components.

10.1 Pre-Start-Up Checks

All pre-start-up checks must be carried out before

lighting the heater.

Ensure that the heater and all controls are suitable

for the gas, pressure and electrical supply to which

they are to be connected.

10.1.1 Electrical Checks

1. Check that all site wiring is connected in

accordance with the appropriate wiring diagram

on Page 18, Section 9.3.

10.1.2 Gas Supply

All aspects of the gas installation including the gas

meter must be inspected, tested for gas tightness

and purged in accordance with local and national

codes.

Ensure that the air is fully purged from the heater

inlet pipe up to the main gas valve inlet test nipple.

10.1.3 Mechanical Checks

1. Check that the flue (and air intake for separated

combustion units) is installed in accordance

with these instructions and local regulations.

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UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

Figure 11: Automatic Burner Control Sequence

Burner Sequence for Ignition Control

START

RUN

SHUT DOWN

Thermostat 24 V

Flue Blower

30 Seconds Purge*

30 Seconds Post Purge

Pressure

Switch

ts = 10 Seconds

Ignition Spark

Start Gas Valve

Flame Signal

*Purge time begins at pressure switch change over.

Required Incoming Signals

If at any stage the flame fails, the control will retry

for ignition. The control has four trials for ignition

before a one hour lockout.

Signals Output By Control

Figure 12: Gas Valve

END VIEW

TOP VIEW

Regulator

OFF

Outlet

Gas Inlet

Pressure

Description

Part Number

Gas Valve 150 - 225 NG

Gas Valve 150 - 225 LP

Gas Valve 250 - 400 NG

Gas Valve 250 - 400 LP

90032505

90032506

90032520

90032521

Inlet Pressure

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SECTION 10: OPERATION AND MAINTENANCE

10.2.2 Start-Up the Gas Valve (All Gases)

10.2.2.1 Check Burner Gas Pressure

1. Remove the plug in the outlet (burner) pressure

test point and connect a pressure tap and a

manometer.

correctly. Set the switches (if fitted) and

thermostat(s) to the users’ requirements.

10.3 Complete Start-Up

Ensure that all covers are fitted correctly and all test

points are properly sealed.

2. With the burner firing, measure the pressure on

the manometer. To adjust the burner pressure,

remove the regulator cover from the valve and

turn the regulator adjustment screw to set the

required burner pressure as stated in the

Technical Data Tables for the correct gas and

model on Page 38, Section 15.2.

10.3.1 Instruction to the User

Explain the controls of the heater to the user

including how to turn it on and off, using the controls

fitted on site.

Give this manual to the user.

Ensure that the user is shown and understands the

importance of maintaining clearances to

combustibles on Page 3, Figure 1 and the user

instructions on Page 24, Section 11 through Page

24, Section 11.4 and all warnings defined in this

manual.

IMPORTANT: If the correct burner pressure cannot

be reached, then check the inlet pressure to the

valve with the burner firing. See Technical Data

Tables on Page 38, Section 15.2 for inlet pressure

requirement.

Do not continue to adjust the regulator if the

pressure is not changing.

If the inlet pressure is too low to allow correct burner

pressure setting, then the gas inlet pressure must be

corrected before completing the start-up.

Check Gas Rate

1. After burner pressure adjustment, allow the

heater to operate for at least 15 minutes and

then re-check settings. Adjust pressure setting

if necessary.

2. Check gas flow rate at gas meter.

3. Turn off heater and electrical supply.

4. Remove the manometer and refit all covers to

the valve and tighten the screw of the outlet

pressure tap.

10.2.3 Pressure Switch

The pressure switch is factory pre-set for each

model and is not adjustable.

10.2.4 Turning Off the Heater

Set the thermostat to the "OFF" position or lowest

setting and the main burner will stop.

10.2.5 External Controls

External controls may include time switch, interlock

switch, room thermostat and frost thermostat.

Operate each control to ensure that they function

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UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 11: USER INSTRUCTIONS

11.3.2 To Turn Heater Off

Set the thermostat to the "OFF" position.

The burner will turn off immediately.

To restart, turn the thermostat above room

temperature.

WARNING

11.4 Simple Troubleshooting

Some possible reasons for the heater not operating

are:

Explosion Hazard

1. Gas supply not "ON".

Installation, service and annual inspection

must be done by a contractor qualified in

the installation and service of gas-fired

heating equipment or your gas supplier.

2. Electricity supply not "ON".

3. The time and/or temperature controls are not

"ON".

Turn off gas and electrical supplies before

4. A limit switch may have operated. This may be

caused by an interruption of the electrical

supply, failure of the distribution fan or vent or

heat exchanger blockage.

performing service or maintenance.

Failure to follow these instructions can

result in death, injury or property damage.

11.1 User Instructions

The UHD[X][S][R] Series heaters are fully automatic

and operate from the external controls fitted on site.

If a temperature limit switch persistently trips, there

is a fault which must be investigated by a contractor

qualified in the installation and service of gas-fired

heating equipment.

11.2 Heater Operation

11.4.1 Simple Troubleshooting (Burner Faults)

When the heater has been switched on by the

thermostat installed on site, the main burner will

automatically turn on.

The burner control box will control the safe ignition

of the flame.

If the burner fails to ignite for any reason, it will retry

for ignition (four trials total). After four unsuccessful

ignition trials, the control will put the heater into

lockout for one hour.

Lockout should not occur during normal operation of

the heater and indicates there is a fault condition

which must be corrected. There is an LED light on

the ignition control that flashes codes to assist in

fault correction. See Page 24, Figure 13 for LED

indication codes.

All heaters require a constant gas and electricity

supply which must not be interrupted during the

normal operation of this heater.

11.3 Lighting Instructions

11.3.1 To Turn On Heater

1. Ensure that the electrical and gas supplies to

the heater are on. Check that the on site

controls are "ON".

Figure 13: LED Diagnostic Codes

LED INDICATION FAULT MODE

Slow Flash

Fast Flash

2 Flashes

3 Flashes

4 Flashes

Normal Operation - No call for heat.

Normal Operation - Call for heat.

IMPORTANT: The thermostat setting must be above

the ambient temperature for the heater to operate.

Ignition Lockout - No flame detected.

Airflow Fault - Pressure switch open or closed.

Temperature Limit or

Switch Open

The automatic firing sequence will begin as

described on Page 22, Figure 11. The heater will

now operate automatically under the control of the

on site controls.

5 Flashes

Steady On

Flame Sense Error - Gas valve not energized.

Internal Control Failure

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SECTION 12: SERVICING

3. Remove the ignition electrode and flame probe.

Check condition of ignition electrode and flame

probe. Clean off any deposits which may have

been formed, check condition of ceramic

insulators. Replace as required.

WARNING

12.3 Heat Exchanger Maintenance

The heat exchanger will remain clean unless a

problem has developed with combustion. Inspect the

heat exchanger. Look for signs of overheating at the

front tubes which may indicate burner over firing or

persistently low air flows.

Explosion Hazard

Installation, service and annual inspection

must be done by a contractor qualified in

the installation and service of gas-fired

heating equipment or your gas supplier.

12.4 Gas Valve Maintenance

Turn off gas and electrical supplies before

performing service or maintenance.

No regular maintenance is required on this device.

To change gas control valves, See Page 32, Section

14.1.

Failure to follow these instructions can

result in death, injury or property damage.

Do not repair or disassemble gas valve.

Replace faulty gas valves with replacement parts

sold and supplied by Roberts-Gordon.

12.1 Servicing Instructions

After start-up, the heater will require maintenance to

be carried out annually. If the heater is used in a

dirty or dusty area, more frequent maintenance may

be required.

12.5 Flue Blower

The flue blower should not require maintenance.

However, if the air pressure switch is causing burner

lockout, then remove the flue blower from the vent

box by unscrewing the three screws at the mounting

plate. Remove the four screws attaching the

mounting plate to the fan inlet (See Page 35,

Section 14.5). Ensure that the fan is free to run and

that the fan wheel is clean.

IMPORTANT: After any maintenance or repair work,

always test fire the heater in accordance with the

start-up instructions on Page 21, Section 10 through

Page 23, Section 10.3.1 to ensure all safety systems

are in working order before leaving the heater to

operate. Minor faults may be traced by using the

troubleshooting charts on Page 28, Section 13

through Page 31, Section 13.5.

12.6 Venting and Air Intake Pipe

Inspect all venting and air intake pipe. Ensure that

all seams are sealed and suspension points secure.

Repair suspension points if any part of the venting

or combustion air pipe is sagging. Check to make

sure any insulation is not missing or in poor

IMPORTANT: Check all gas pipes and pipe joints to

ensure there are no cracks or gas leaks. Any cracks

in the pipes or pipe joints must be repaired.

condition. Replace as required. Check all venting

and air intake components to ensure they are in

good condition, gas tight and corrosion-free.

IMPORTANT: Inspect all suspended components

and hardware. Ensure that they are in good

condition, properly tightened, and corrosion free.

12.2 Burner Maintenance

1. Open the door and remove the burner

compartment cover. See Page 33, Section

14.2.

2. Clean any deposits from the main burner which

may have formed in the injectors or venturi of

the burner. See Page 33, Section 14.2.

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UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

12.7 Maintenance Checklist

Installation Code and Annual Inspections: All

WARNING

installations and service of ROBERTS GORDON^®

equipment must be performed by a contractor

qualified in the installation and service equipment

sold and supplied by Roberts-Gordon and conform

to all requirements set forth in the ROBERTS

GORDON^®manuals and all applicable

governmental authorities pertaining to the

installation, service and operation of the equipment.

Explosion Hazard

Installation, service and annual inspection

must be done by a contractor qualified in

the installation and service of gas-fired

heating equipment or your gas supplier.

To help facilitate optimum performance and safety,

Roberts-Gordon recommends that a qualified

contractor annually inspect your ROBERTS

GORDON^®equipment and perform service where

necessary, using only replacement parts sold and

supplied by Roberts-Gordon.

Turn off gas and electrical supplies before

performing service or maintenance.

Failure to follow these instructions can

result in death, injury or property damage.

The Vicinity of the Heater Do not store or use flammable objects, liquids or vapors near the heater.

Immediately remove these items if they are present.

See Page 3, Section 3.

Vehicles and Other

Objects

Maintain the clearances to combustibles.

Do not hang anything from, or place anything on, the heater.

Make sure nothing is lodged in between the heat exchanger tubes.

Immediately remove objects in violation of the clearances to combustibles.

See Page 3, Section 3.

Vent Pipe/Terminals

Venting must be intact. Using a flashlight, look for obstructions, cracks on the

pipe, gaps in the sealed areas or corrosion.

The area must be free of dirt and dust.

Remove any carbon deposits or scale using a wire brush.

If the vent terminal has a screen built in, remove any dirt, dust or deposits

from the screen.

See Page 15, Section 7.

Combustion Air Intake

Pipe

Intake pipe and inlet must be intact. Look for obstructions, cracks on the pipe,

gaps in the sealed areas or corrosion.

The area must be free of dirt and dust.

Clean and reinstall as required.

Heat Exchanger

Make sure there are no cracks.

Make sure there is no sagging, bending or distortion.

Clean or replace as required.

See Page 16, Section 8.

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SECTION 12: SERVICING

Gas Line and Shut-off

Valves

Check for gas leaks.

See Page 16, Section 8.

Burner Observation

Window

Make sure it is clean and free of cracks or holes.

Clean and replace as required.

Flue Blower Scroll, Wheel Compressed air or a vacuum cleaner may be used to clean dust and dirt.

and Motor

Inshot Burners and

Orifices

Clear obstructions (even spider webs will cause problems).

Carefully remove any dust and debris from the burner.

Direct-Spark Igniter

Replace if there are cracked ceramics, excessive carbon residue, or erosion

of the electrode.

The electrode gap should be 1/8" (3.2 mm).

Thermostat

There should be no exposed wire or damage to the device or wiring.

See Page 17, Section 9.

Suspension Points

Make sure the heater is hanging securely.

Look for signs of wear on the suspension materials or ceiling.

See Page 8, Figure 3.

Silicone Tubing

Gas Valve

Ensure tight, secure fit on all pressure fittings at pressure switch,

burner partition, and blower outlet.

Verify that cap covering pressure regulator adjustment screw is secure and

has not been tampered with.

Verify all wiring connections.

Condensate Drain

(when installed)

Flush drain and clear any obstructions.

Ductwork

Consult an indoor air quality professional for proper cleaning procedures

Air Circulation Blower

For a complete inspection, refer the manufacturers Installation, Operation and

Service manual.

Wall Tag

If wall tag is present, make sure it is legible and accurate. Please contact

Roberts-Gordon LLC or your ROBERTS-GORDON^®independent distributor if

you need a wall tag. See Page 2, Section 2.1.

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UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 13: TROUBLESHOOTING

13.1 General

START

WARNING

Are gas & electrical

Turn on supplies.

supplies on?

Explosion Hazard

Installation, service and annual inspection

must be done by a contractor qualified in

the installation and service of gas-fired

heating equipment or your gas supplier.

Turn off gas and electrical supplies before

performing service or maintenance.

Failure to follow these instructions can

result in death, injury or property damage.

Yes

Wait 10 - 15 minutes for

limit switch to cool. Does

fan stop running?

Is ignition control showing a

"4 flashes" LED code?

Fan and limit switch are

operating normally.

Yes

Replace temperature limit

switch.

Burner has locked out due

to ignition failure. Use

Troubleshooting for Automatic

Ignition Burner Systems

section to test burner.

Is ignition control showing a

"2 flashes" LED code?

Yes

Use Troubleshooting for

Flue Blower section to test

fan.

Does the flue blower run?

Yes

With external controls (i.e.

thermostat) on, does the

burner continue through the

heating cycle?

The limit switch has

tripped. See Manual Reset

Has burner “Locked Out”?

Limit Switch Figure.

Yes

Use Troubleshooting for

Automatic Ignition Burner

Systems section to test burner.

Ensure air flow through

heat exchanger is

appropriate per the rating

plate.

Yes

If problems persist, contact

Roberts-Gordon LLC at

www.rg-inc.com

Heater Operating

TROUBLESHOOT ENDS.

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SECTION 13: TROUBLESHOOTING

13.2 Troubleshooting For Automatic Ignition Burner Systems

START

Are gas & electrical

Turn on supplies.

supplies on?

Yes

Are external controls

(i.e. Thermostat) on?

Turn on controls.

Yes

Wait 10 - 15 minutes for

limit switch to cool. Does

fan stop running?

Is ignition control showing a

"4 flashes" LED code?

Fan and limit switch are

operating normally.

Yes

Replace temperature limit

switch.

Does flue blower run?

Is 120 V supply at fan

Flue blower faulty;

Yes

connections?

replace

Burner control faulty or wiring

connections faulty. Repair

or replace as required

Yes

Check for too much vent/air inlet duct. Check for blockage in

vent and combustion air circuit. Check for faulty air pressure

switch. Check pressure switch hoses for leaks or cracks.

Do not attempt to circumvent pressure switch circuit to

place unit in operation.See Pressure Switch section for details.

Does air pressure switch

change over?

Yes

Is ignition lead okay and

connected?

Is spark electrode okay?

Wait 30 - 40 seconds.

Does ignition spark

operate?

Ignition control faulty;

replace.

See Ignition Control section.

Yes

Is the gas valve operating?

To test valve, See

Troubleshooting for Gas

Valves section.

Replace valve.

Does the flame light?

Yes

Trace fault in supervision

system. See

Is the flame current at

least 1 μAmp DC when

the flame ignites?

Is ignition control showing

a "2 flashes" LED code?

Yes

Troubleshooting

for Flame Supervision

System section.

If problems persist, contact

Roberts-Gordon LLC at

www.rg-inc.com

Heater Operating

TROUBLESHOOT ENDS.

For optimum heater performance, use only replacement parts sold and supplied by Roberts-Gordon.

Conduct start-up procedure as shown on Page 21, Section 10.

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UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

13.3 Troubleshooting for Flame Supervision System

To measure flame current, connect a 0 - 50 μA DC meter in series with the flame probe. If the meter

reads negative values, then reverse the test leads.

START

Connect a DC ammeter in

series with the flame probe.

Use General

Troubleshooting section to

trace the fault.

Is the flame present and

at least 1 μA DC flame

current?

Yes

Is the connecting lead

damaged? Is the flame probe

damaged or touching earthed

components?

Is there a current flowing in

the flame probe circuit with

no flame present?

Repair or replace as

Yes

required.

Is inlet burner gas pressure

correct? Is live and neutral

polarity correct? Is

Does “lockout” occur when

there is a flame present?

Yes Replace ignition control.

flame probe circuit correct?

Repair or replace as

required.

If problems persist, contact

Roberts-Gordon LLC at

www.rg-inc.com

Heater Operating

TROUBLESHOOT ENDS.

NOTE: Minimum flame probe current 1 μA DC. Typical flame probe current 3-5 μA DC.

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SECTION 13: TROUBLESHOOTING

13.4 Troubleshooting for Gas Valves

START

Is gas pressure at inlet of the

valve correct for gas type?

Note pressure found.

Fault elsewhere.

Correct pressure problem.

Yes

Valve or ignition control

faulty. Replace with

one of correct type.

Does gas pressure at outlet

of the valve rise when

valve turns on?

Yes

Does gas pressure at

outlet of valve return to zero or

lower when valve turns off?

Valve faulty.

Replace with one of

correct type.

Yes

If problems persist, contact

Roberts-Gordon LLC at

www.rg-inc.com

Valve Operating

TROUBLESHOOT ENDS.

13.5 Troubleshooting for Flue Blower

START

Does flue blower run

automatically when there

is a call for heat?

Correct power

supply problem.

Yes

Blower motor faulty.

Replace with correct type.

Yes

Does blower turn on and

off while burner is firing

continuously?

Check blower motor leads

for loose connections.

Yes

If problems persist, contact

Roberts-Gordon LLC at

www.rg-inc.com

Blower Operating

TROUBLESHOOT ENDS.

For optimum heater performance, use only replacement parts sold and supplied by Roberts-Gordon.

Conduct start-up procedure as shown on Page 21, Section 10.

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UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 14: REPLACEMENT PARTS

Burner Components

All serviceable burner parts are accessed by the

door on the side of the heater. Remove the

sheetmetal screws.

WARNING

14.1 Gas Valve

Remove the gas supply pipe at the heater inlet.

Explosion Hazard

Follow steps in Section 14.2 and See Page 33,

Section 14.2.1 to remove gas valve/manifold.

Installation, service and annual inspection

must be done by a contractor qualified in

the installation and service of gas-fired

heating equipment or your gas supplier.

Replace in reverse order. Verify that the gas flow

direction of the valve is correct. Use a minimum

amount of gas seal on the thread joint. Check that

all the joints are leak free. Reset gas valve. See

Page 23, Section 10.2.2.

Turn off gas and electrical supplies before

performing service or maintenance.

Failure to follow these instructions can

IT IS IMPORTANT THAT ONLY THE CORRECT

GAS VALVE IS USED WHEN REPLACING THESE

CONTROLS.

result in death, injury or property damage.

See warnings and important information on Page

25, Section 12 before removing or replacing parts.

NOTE: Separated combustion model shown.

Flexible

Air Duct

OFF

Description

Part Number

90032505

90032506

90032520

90032521

Gas Valve, NG (Models UHD[X][S][R] 150 - 225)

Gas Valve, LP (Models UHD[X][S][R] 150 - 225)

Gas Valve, NG (Models UHD[X][S][R] 250 - 400)

Gas Valve, LP (ModelsUHD[X][S][R] 250 - 400)

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SECTION 14: REPLACEMENT PARTS

14.2 Burner Compartment

The burner compartment is

a sealed compartment.

Following any work,

re-seal the compartment

with the gas pipe rubber

seal fully in place and all

screws fitted and tight.

Burner

Compartment

Cover

Flame Probe

Viewing port

for flame probe

Remove flexible

air duct from spigot

Ignition Electrode

NOTE: Separated combustion

model shown.

Viewing port

for ignition electrode

Remove

access plate

Rubber Seal

Remove screws and

pull off burner

compartment cover

14.2.1 Burner Injectors

Ensure gas tight fitting of injectors.

Ensure correct alignment with burners.

Ensure all pipe joints are gas tight.

Inshot

Manifold

Burners

Remove manifold

screws and pull

out manifold

Injectors

Manifold

Unscrew

Orfices

Burner

venturi

Burner

Screws

Marking

Folded

Hem

UHD[X][S][R] UHD[X][S][R] UHD[X][S][R] UHD[X][S][R] UHD[X][S][R] UHD[X][S][R] UHD[X][S][R] UHD[X][S][R]

MODEL

150

175

200

225

250

300

350

400

Orifice

Quantity

Natural Gas (G20)

Orifice

Marking

2.25 mm

P/N

91930043

91930225

91930040

Propane (G31)

Orifice

Marking

1.35 mm

91930135

1.35 mm

1.45 mm

P/N

91930135

91930054

91930145

91930053

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UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

14.3 Ignition Electrode and Flame Probe

To replace the electrode or flame probe, remove the electrical lead and screw.

Pull out from mounting. Refit in reverse ensuring that the gap to burner is as shown in the

front view of the burner compartment.

Description

Spark Electrode

Automatic Ignition Flame Probe

Transformer

Ignition Module

Inshot Burners UHD[X][S][R] 150

Inshot Burners UHD[X][S][R] 175

Inshot Burners UHD[X][S][R] 200

Inshot Burners UHD[X][S][R] 225

Inshot Burners UHD[X][S][R] 250

Inshot Burners UHD[X][S][R] 300

Inshot Burners UHD[X][S][R] 350

Inshot Burners UHD[X][S][R] 400

Limit Switch (150 - 400)

Part Number

90427411

90439300

90436900K

90434008

92000001

92000000

92000002

90412103

90412105

90412107

Qty.

Limit Switch (300 - 400)

Limit Switch (175)

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SECTION 14: REPLACEMENT PARTS

14.4 Heat Exchanger

The heat exchanger consists of a four-pass design with 1.75" outer diameter [409 stainless steel] tube. The

tube plates are made of [aluminized steel] [409 stainless steel]. The tube supports are made of

[galvannealed steel] [409 stainless steel].

14.5 Flue Blower

Remove screws securing

outlet flange to the flue

adapter.

Refit in reverse order.

Remove screws securing flue

blower mounting plate to vent

box.

Remove screws securing

mounting plate to blower.

Refit in reverse.

Use new gaskets.

Ensure sealed joints.

Ensure mounting plate orifice

is clear and not obstructed.

UHD[X][S][R]

150 - 175

UHD[X][S][R]

200 - 300

UHD[X][S][R]

350 - 400

MODEL

Flue Blower P/N

90710405

90710403

90710402

IT IS IMPORTANT THAT ONLY THE CORRECT FLUE BLOWER SPECIFIED FOR EACH MODEL TYPE

IS USED WHEN REPLACING THESE ITEMS.

Carry out a start-up after working on or changing a flue blower. See Page 24, Section 11.

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UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

14.6 Pressure Switch

Pull off 3 way connector. Spring open plastic clips of mounting cradle. Replace with correct type of

pressure switch for model. The pressure switches are color coded for each pressure setting.

Carry out a start-up after working on or changing a pressure switch. See Page 21, Section 10.

UHD[X][S][R]

150 - 175

UHD[X][S][R]

200 - 225

UHD[X][S][R]

250

UHD[X][S][R]

300 - 350

UHD[X][S][R]

400

MODEL

Pressure Switch

Kit P/N

90439802

yellow

.32

90439808

orange

.79

90439803

gray

90439807

brown

.68

90439808

orange

.79

Color Code

Set Point (in wc)

.41

Pressure Switch

Snap Ring P/N

90439850

14.7 Ignition Control

The control mounts to the electrical plate. Pull out ignition cable and wiring from board, noting their

positions. Release the four mounting standoffs. Refit in reverse. Ensure correct location of ignition cable

and all other wiring.

14.8 Limit Switches

14.8.1 Removal and Replacement

1. Remove the electrical connections to the switch.

2. Unscrew the two screws securing the switch.

3. Fit a new switch with two screws.

4. Reconnect the electrical connections and test operation.

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SECTION 15: SPECIFICATIONS

15.1 Dimension Data

TOP VIEW

Heater must be supported

at these points from

above or below.

Support

Centers

4 x 3/8" Captive Nuts Provided

19.4"

(49 cm)

END VIEW

25.5"

(65 cm)

REAR VIEW

Air Intake

(UHD[X][S][R]

only)

Flue

Gas

Supply

Thermostat

Connection

Electrical

Supply

6.5"

(17 cm)

2.4"

(6 cm)

UHD

Model

[X][S][R] [X][S][R] [X][S][R] [X][S][R] [X][S][R] [X][S][R] [X][S][R] [X][S][R]

150

175

200

225

250

300

350

400

(cm)

42.4

(108)

26.9

(68)

1.25

(3)

12.3

(31)

12.4

(32)

17.7

(45)

15.5

(39)

42.4

(108)

26.9

(68)

1. 25

(3)

12.3

(31)

12.4

(32)

17.7

(45)

15.5

(39)

42.4

(108)

35.2

(89)

1.25

(3)

12.3

(31)

12.4

(32)

17.7

(45)

17.5

(44)

42.4

(108)

35.2

(89)

1. 25

(3)

12.3

(31)

12.4

(32)

17.7

(45)

17.5

(44)

42.4

(108)

35.2

(89)

1. 25

(3)

12.3

(31)

12.4

(32)

17.7

(45)

17.5

(44)

52.3

(133)

43.5

(110)

1.25

(3)

12.3

(31)

15.3

(39)

24.7

(63)

13.8

(35)

7. 0

(18)

52.3

(133)

43.5

(110)

1. 25

(3)

12.3

(31)

15.3

(39)

124.7

(63)

13.8

(35)

7. 0

(18)

52.3

(133)

43.5

(110)

1.25

(3)

12.3

(31)

15.3

(39)

24.7

(63)

13.8

(35)

7. 0

(18)

Width

Height

Duct Connector

Flange

Support Spacing

Center of Flue

Center of

Flue/Air Intake

5.5

(14)

8.2

(21)

5.5

(14)

8.2

(21)

6.4

(16)

8.8

(22)

6.4

(16)

8.8

(22)

6.4

(16)

8.8

(22)

(cm)

Position of Flue

(28)

(cm)

5.8

(15)

3.0

(8)

5.8

(15)

3.0

(8)

5.8

(15)

7. 6

(19)

5.8

(15)

7. 6

(19)

5.8

(15)

7. 6

(19)

5.8

(15)

10.1

(26)

5.8

(15)

10.1

(26)

5.8

(15)

10.1

(26)

Gas Inlet Position

Position of Electrical

Supply

Minimum Inlet Duct

Length

(cm)

(132)

(162)

(190)

Weight

lb.

191

211

239

249

254

325

345

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UHD STANDARD DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

15.2 General Technical Data Table

UHD

[X][S][R] [X][S][R] [X][S][R] [X][S][R] [X][S][R] [X][S][R] [X][S][R] [X][S][R]

Model

150

175

200

225

250

300

350

400

Full Load Amps @ 115 V

Minimum Air Volume

CFM

1360

1400

2050

2100

2350

2700

3120

3420

Temperature Rise @

Minimum Air Volume

°F

(°C)

(28)

(35)

(23)

(27)

(30)

Heat Exchanger Pressure

Drop @ Minimum Air Volume in wc

0.02

0.03

0.025

7750

0.035

8300

0.05

0.02

0.03

0.04

Maximum Air Volume

CFM

5800

6850

8850

10200

13600

14200

Temperature Rise @

Maximum Air Volume

°F

(°C)

(7)

(6)

(5)

(6)

Heat Exchanger Pressure

Drop @Maximum Air Volume in wc

0.16

0.29

0.163

0.253

0.35

0.27

0.48

0.53

4 - All Models

(10)

Flue Size*

(cm)

(10)

(13)

Air Intake*

(cm)

* Do not exceed the maximum length of flue stated or heater may not operate properly.

15.3 Technical Data Table

UHD

Model

[X][S][R] [X][S][R] [X][S][R] [X][S][R] [X][S][R] [X][S][R] [X][S][R]] [X][S][R]

150

123

175

200

164

225

250

205

300

246

350

287

400

Total Input

Total Output

Efficiency

(Btu/h) x (1000)

175

225

385

143.5

184.5

315.7

82 - All Models

Natural Gas (G20) Data - Inlet Pressure 5.0 in wc Min., 14 in wc Max.

Burner Pressure in wc 3.2 3.4 3.7

LPG / Propane (G31) Data - Inlet Pressure 12.0 in wc Min., 14 in wc Max.

Burner Pressure in wc 9.9 10.4 10.5

3.7

4.0

2.7

9.4

2.7

9.3

3.3

10.7

10.5

11.1

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SECTION 16: THE ROBERTS GORDON^®COMBAT^®UHD-SERIES WARRANTY

SECTION 16: THE ROBERTS GORDON^®

COMBAT^®UHD-SERIES WARRANTY

The data plate and/or serial number are removed,

defaced, modified or altered in any way.

The ownership of the ROBERTS GORDON^®COMBAT^®

UHD-Series is moved or transferred. This warranty is

ROBERTS GORDON^®WILL PAY FOR:

nontransferable.

Roberts-Gordon is not permitted to inspect the damaged

controller and/or component parts.

Within 24 months from date of purchase by buyer or 27

months from date of shipment by Roberts-Gordon

(whichever comes first), replacement parts will be

provided free of charge for any part of the product which

fails due to a manufacturing or material defect.

READ YOUR INSTALLATION, OPERATION AND

SERVICE MANUAL

If you have questions about your controller, contact your

installing professional. Should you need Replacement

Parts or have additional questions, call or write Roberts-

Gordon:

U.S.A.

1250 William Street

P. O. B ox 4 4

Roberts-Gordon will require the part in question to be

returned to the factory. Roberts-Gordon will, at its sole

discretion, repair or replace after determining the nature

of the defect and disposition of part in question.

ROBERTS GORDON^®Replacement Parts are warranted

for a period of 18 months from date of shipment from

Roberts-Gordon or the remaining ROBERTS GORDON^®

COMBAT^®UHD-Series warranty.

Buffalo, New York 14240-0044

716.852.4400

On the web at: www.rg-inc.com

ROBERTS GORDON^®WILL NOT PAY FOR:

Service trips, service calls and labor charges.

Shipment of replacement parts.

Roberts-Gordon's liability, and your exclusive

remedy, under this warranty or any implied warranty

(including the implied warranties of merchantability

and fitness for a particular purpose) is limited to

providing replacement parts during the term of this

warranty. Some jurisdictions do not allow limitations on

how long an implied warranty lasts, so this limitation may

not apply to you. There are no rights, warranties or

conditions, expressed or implied, statutory or otherwise,

other than those contained in this warranty.

Claims where the total price of the goods have not

been paid.

Damage due to:

• Improper installation, operation or maintenance.

• Misuse, abuse, neglect, or modification of the

ROBERTS GORDON^®COMBAT^®UHD-Series in any

way.

• Use of the ROBERTS GORDON^®COMBAT^®UHD-

Series for other than its intended purpose.

Roberts-Gordon shall in no event be responsible for

incidental or consequential damages or incur liability

for damages in excess of the amount paid by you for

the ROBERTS GORDON^®COMBAT^®UHD-Series.

Some jurisdictions do not allow the exclusion or limitation

of incidental or consequential damages, so this limitation

or exclusion may not apply to you. This warranty gives

you specific legal rights, and you may also have other

rights which vary from jurisdiction to jurisdiction.

• Incorrect gas or electrical supply, accident, fire, floods,

acts of God, war, terrorism, or other casualty.

• Improper service, use of replacement parts or

accessories not specified by Roberts-Gordon.

• Failure to install or maintain the ROBERTS

GORDON^®COMBAT^®UHD-Series as directed in the

Installation, Operation and Service manual.

• Relocation of the ROBERTS GORDON^®COMBAT^®

Roberts-Gordon shall not be responsible for failure to

perform under the terms of this warranty if caused by

circumstances out of its control, including but not limited

to war, fire, flood, strike, government or court orders, acts

of God, terrorism, unavailability of supplies, parts or

power. No person is authorized to assume for Roberts-

Gordon any other warranty, obligation or liability.

UHD-Series after initial installation

• The use of the ROBERTS GORDON^®COMBAT^®

UHD-Series in a corrosive atmosphere containing

contaminants.

• The use of the ROBERTS GORDON^®COMBAT^®

UHD-Series in the vicinity of a combustible or

explosive material.

• Any defect in the ROBERTS GORDON^®COMBAT^®

UHD-Series arising from a drawing, design, or

specification supplied by or on behalf of the

consumer.

LIMITATIONS ON AUTHORITY OF

REPRESENTATIVES:

No representative of Roberts-Gordon, other than an

Executive Officer, has authority to change or extend these

provisions. Changes or extensions shall be binding only if

confirmed in writing by Roberts-Gordon's duly authorized

Executive Officer.

• Damage incurred during shipment. Claim must be

filed with carrier.

WARRANTY IS VOID IF:

The ROBERTS GORDON^®COMBAT^®UHD-Series is not

installed by an contractor qualified in the installation and

service of gas-fired heating equipment.

You cannot prove original purchase date and required

annual maintenance history.

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Wa r m A i r H e a t i n g

OWNER WARRANTY REGISTRATION CARD

Mail or Fax to:

Roberts Gordon LLC • 1250 William Street, P.O. Box 44 • Buffalo, NY 14240-0044 • Phone: 716-852-4400 • Fax: 716-852-0854

Toll Free: 800-828-7450 • www.rg-inc.com

About the Owner:

Name:__________________________________________________________________________________________________

Address:______________________________________City:_________________________State:__________Zip Code:________

Phone:_________________________ Fax:_________________________ E-mail:______________________________________

About the Installer:

Name:__________________________________________________________________________________________________

Address:______________________________________City:_________________________State:_________Zip Code:_________

Phone:__________________________Fax:_________________________E-mail:______________________________________

Purchased From (if different than installer):

Name:__________________________________________________________________________________________________

Address:______________________________________City:_________________________State:__________Zip Code:________

Phone:_________________________ Fax:_________________________ E-mail:______________________________________

About your Heater:

Model#:_______________________ Serial #:___________________________ Fuel:____________Installation Date:__________

Type of Installation (check one):

o Automotive

o Manufacturing

o Warehouse

o Recreational

o Aircraft

o Public Building

o Ofﬁce

o Retail

o Agricultural

o Other______________

Installation Code and Annual Inspections: All installations and service of ROBERTS GORDON^®equipment must be performed by a

contractor qualiﬁed in the installation and service of equipment sold and supplied by Roberts-Gordon and conform to all

requirements set forth in the ROBERTS GORDON^®manuals and all applicable governmental authorities pertaining to the

installation, service and operation of the equipment.

To help facilitate optimum performance and safety, Roberts-Gordon recommends that a qualiﬁed contractor annually inspect your

ROBERTS GORDON^®equipment and perform service where necessary, using only replacement parts sold and supplied by

Roberts-Gordon.

These products are not approved for residential use.

copied in any form or by any means – graphic, electronic, or mechanical, including photcopying,

recording, taping, or information storage and retrieval systems – without written permission of

Roberts Gordon LLC.

Printed in the U.S.A.

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Attach this information to the wall near the ROBERTS GORDON^®heater

Read the Installation, Operation and Service Manual thoroughly before installation, operation or service.

OPERATING INSTRUCTIONS

WARNING

1. STOP! Read all safety instructions on this information sheet.

2. Open the manual gas valve in the heater supply line.

3. Turn on electric power to the heater.

4. Set the thermostat to desired setting (above ambient temperature).

The automatic starting sequence begins.

TO TURN OFF THE HEATER

1. Turn the thermostat/time switch to 'OFF' or lowest setting. The burner

will turn 'OFF' immediately, but fans will continue to cool heat exchanger

until the fan thermostat switches off.

Fire Hazard

Some objects can catch fire or explode when placed

close to heater.

IF THE HEATER WILL NOT OPERATE, TO ENSURE YOUR SAFETY,

FOLLOW THESE INSTRUCTIONS TO SHUT DOWN YOUR HEATER

Keep all flammable objects, liquids and vapors the

required clearances to combustibles away from

heater.

1. Set the thermostat to off or the lowest setting.

2. Turn off electric power to the heater.

3. Turn off the manual gas valve in the heater supply line.

4. Call your installer/contractor qualified in the installation and

service of gas-fired heating equipment.

Failure to follow these instructions can result in

death, injury or property damage.

Clearances to Combustibles

Top

Left

Right

Left

Right

Bottom

Models 75 - 125

Models 150 - 400

150 - 400

75 - 125

Models

31"*

18"*

Top

Bottom

Right

Left

Vent

* Clearance needed for servicing.

Roberts-Gordon LLC

1250 William Street

P.O. Box 44

Telephone: 716.852.4400

Fax: 716.852.0854

Toll Free: 800.828.7450

Buffalo, NY 14240-0044 USA

Installation Code and Annual Inspections:

All installation and service of ROBERTS GORDON^®equipment must be performed by a contractor qualiﬁed in the installation and service of equipment sold and supplied by Roberts-Gordon and

conform to all requirements set forth in the ROBERTS GORDON^®manuals and all applicable governmental authorities pertaining to the installation, service and operation of the equipment. To help

facilitate optimum performance and safety, Roberts-Gordon recommends that a qualiﬁed contractor conduct annual inspections of your ROBERTS GORDON^®equipment and perform service

where necessary, using only replacement parts sold and supplied by Roberts-Gordon.

For installations at elevations above 2000' (610 m), the appliance shall be derated 4% for each 1000' (305 m) of elevation above sea level.

Further Information:Applications, engineering and detailed guidance on systems design, installation and equipment performance is available through ROBERTS GORDON^®representatives. Please

This product is not for residential use.

www.rg-inc.com

Printed in U.S.A.

P/N 91039831

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