Roberts Gorden Gas Heater UHA[X][S] 100 User Guide

Combat

UHA-Series

Tubular Unit Heaters

(Low Profile Range)

Installation, Operation

& Service Manual

Models UHA[X][S]

30, 45, 60, 75, 100, 125

Installer

WARNING

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.

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.

Owner

Keep this manual in a safe place in order to provide

your serviceman with necessary information.

Installation must be done by a contractor qualified

in the installation and service of gas-fired heating

equipment or your gas supplier.

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 111100NA 11/08 Rev D

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TABLE OF CONTENTS

SECTION 1: Heater Safety......................................................1 SECTION 10: Operation and Maintenance ..........................29

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

1 .2 Safety Labels and Their Placement .............................1

SECTION 2: Installer Responsibility .....................................5

10.1 Pre-Start-Up Checks ................................................29

10.2 Begin Start-Up .........................................................29

10.3 Complete Start-Up ...................................................32

2.1 Wall T a g .......................................................................5 SECTION 1 1 : User Instructions............................................33

2.2 Corrosive Chemicals....................................................5

2.3 National Standards and Applicable Codes ..................5

SECTION 3: Critical Considerations .....................................6

3.1 Basic Informatio n .........................................................6

3.2 Manufactured Units......................................................6

11 .1 User Instruction s .......................................................33

11 .2 Heater Operation ......................................................33

11 .3 Common User Controls.............................................33

11 .4 Lighting Instruction s ..................................................33

11 .5 Simple T r oubleshooting.............................................34

3.3 Location and Suspension ............................................6 SECTION 12: Servicin g .........................................................35

3.4 Minimum Required Installation Clearances .................6

3.5 Clearances to Combustible s ........................................6

3.6 Ventilation ....................................................................6

3.7 Gas Suppl y ..................................................................7

3.8 Electrical Supply .........................................................7

3.9 Vent..............................................................................7

SECTION 4: National Standards and Applicable Codes .....8

4.1 Gas Codes...................................................................8

12.1 Servicing Instructions...............................................35

12.2 Burner Maintenance.................................................35

12.3 Fan/Motor Assembly Maintenanc e ...........................35

12.4 Heat Exchanger Maintenanc e ..................................35

12.5 Gas Valve Maintenance ...........................................35

12.6 Flue Blower ..............................................................35

12.7 Venting and Air Intake Pip e ......................................36

12.8 Maintenance Checklis t .............................................36

4.2 Aircraft Hangars ...........................................................8 SECTION 13: Troubleshooting .............................................38

4.3 Parking Structures and Repair Garage s ......................8

4.4 Electrica l ......................................................................8

4.5 Ventin g .........................................................................8

4.6 High Altitude ................................................................9

SECTION 5: Major Component s .......................................... 10

5.1 Genera l ...................................................................... 10

13.1 General ....................................................................38

13.2 Troubleshooting For Automatic Ignition

Burner Systems .......................................................39

13.3 T r oubleshooting for Flame Supervision System .......40

13.4 T r oubleshooting for Gas Valve s ................................41

13.5 T r oubleshooting for Flue Blowe r ...............................41

5.2 Shelf Mounting and Suspensio n ................................ 10 SECTION 14: Replacement Parts.........................................42

5.3 Wall Mountin g ............................................................ 10

SECTION 6: Venting.............................................................. 14

6.1 Changing Vent and Air Intake Orientation.................. 14

6.2 Ventin g ....................................................................... 14

6.3 Vent Installation ......................................................... 14

6.4 Unvented Operation................................................... 15

6.5 Horizontal Venting...................................................... 15

6.6 Vertical Ventin g .......................................................... 16

6.7 Length Requirements ................................................ 16

6.8 Vent Materia l .............................................................. 16

14.1 Gas Valv e .................................................................42

14.2 Burner Compartment ...............................................43

14.3 Ignition Electrode and Flame Prob e .........................44

14.4 Heat Exchanger .......................................................45

14.5 Louver and Louver Spring s ......................................45

14.6 Flue Blower Vertical Installation ...............................46

14.7 Pressure Switch........................................................47

14.8 Ignition Contro l .........................................................47

14.9 Axial Fan/Guard/Motor Assembly.............................47

14.10 Limit Switches ........................................................48

6.9 Replacing an Existing Heater in a Venting Syste m .... 16 SECTION 15: Specifications.................................................49

SECTION 7: Air Supply.........................................................2 1

7 .1 Separated Combustion Installation.............................2 1

7 .2 Unvented Installatio n ..................................................2 1

15.1 Dimension Data........................................................49

15.2 General T e chnical Data T a ble (All Models) ..............50

15.3 T e chnical Data T a ble (All Models) ............................50

7 .3 Building Ventilatio n .....................................................2 1 SECTION 16: ROBERTS GORDON^®COMBAT^®

7 .4 Outside Combustion Air Supply..................................2 1

SECTION 8: Gas Pipin g ........................................................2 2

8.1 Connections...............................................................2 2

SECTION 9: Wiring................................................................2 3

9.1 Positioning Thermostats ............................................2 3

9.2 Low Voltage Thermostat with One Heater .................2 3

9.3 Multiple Heater Wiring 30 - 45 ...................................2 4

9.4 Multiple Heater Wiring 60 - 125 .................................2 5

9.5 Internal Wiring Diagra m .............................................2 6

9.6 Ladder Wiring Diagram..............................................2 7

9.7 Electrical Connection to the Heater ...........................2 8

UHA-Series Warranty......................................53

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: UHA 30 - 45 Label Placement ...................................2

Figure 2: UHA 60 - 75 Label Placement ...................................3

Figure 3: UHA 100 - 125 Label Placement................................4

Figure 4: Installation Clearances and Clearances

to Combustibles.........................................................7

Figure 5: Suspension Methods ............................................... 1 1

Figure 6: Shelf-Mounting Method s .......................................... 1 1

Figure 7: Wall Shelf Mounting and Hanging Suspension........ 12

Figure 8: Vertical Louvers (Optional)....................................... 13

Figure 9: Vent and Roof Detai l ................................................ 17

Figure 10: Standard Vented Heater - Vertical and

Horizontal Vent Termination ................................... 17

Figure 11: Standard Vented Heater - Common

Vertical Vent Termination........................................ 18

Figure 12: Separated Combustion Heater - Vertical

and Horizontal Vent Termination ............................ 19

Figure 13: Concentric Vent Box............................................... 19

Figure 14: Concentric Vertical and Horizontal Vent

Termination - Separated Combustion Heater .........20

Figure 15: Gas Connection .....................................................2 2

Figure 16: Automatic Burner Control Sequence......................3 0

Figure 17: Gas Valve for Models UHA[X][S] 30 - 45................3 0

Figure 18: Gas Valve for Models UHA[X][S] 60 - 125..............3 1

Figure 19: Manual Reset Limit Switc h .....................................3 3

Figure 20: LED Diagnostic Codes...........................................3 4

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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 annual

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.

Not all heaters are approved for residential

installation. Check the heater’s silver rating plate for

residential approval status. Heaters that do not have

residential approval must not be installed in

residential spaces. 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.

1.2 Safety Labels and Their Placement

Product safety signs or labels should be replaced by

product user when they are no longer legible.

Please contact Roberts Gordon LLC or your

ROBERTS GORDON^®independent distributor to

obtain replacement signs or labels. See Page 2,

Figure 1 through Page 4, Figure 3.

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Figure 1: UHA 30 - 45 Label Placement

Description

Logo Label

Cut Hazard Label

Part Number

91040030

91010430

91039505

91010427

91010429

91010420

91010431

91010433

91010425

91010426

91010428

Vent Length Label

Vent to Outdoors Label

Warning Label

Rating Plate Label

Installation Label

Instruction Location Label

Lighting Instruction Label

Venting Arrangement Label*

Manual Reset Switch Label

* For separated combustion units only

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SECTION 1: HEATER SAFETY

Figure 2: UHA 60 - 75 Label Placement

Description

Logo Label

Cut Hazard Label

Part Number

91040030

91010430

91039505

91010427

91010429

91010420

91010431

91010433

91010425

91010426

91010428

Vent Length Label

Vent to Outdoors Label

Warning Label

Rating Plate Label

Installation Label

Instruction Location Label

Lighting Instruction Label

Venting Arrangement Label*

Manual Reset Switch Label

* For separated combustion units only

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Figure 3: UHA 100 - 125 Label Placement

VENT TO OUTDOORS

DONNER VENT

DEHORS

Printed in U.S.A.

2006 Roberts-Gordon, LLC

Imprimé aux Etats Unis

P/N 91010427

Description

Logo Label

Part Number

91040030

91010430

91039505

91010427

91010429

91010420

91010431

91010433

91010425

91010426

Cut Hazard Label

Vent Length Label

Vent to Outdoors Label

Warning Label

Rating Plate Label

Installation Label

Instruction Location Label

Lighting Instruction Label

Venting Arrangement Label*

* For separated combustion units only

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SECTION 1: HEATER SAFETY

SECTION 2: INSTALLER RESPONSIBILITY

The installer is responsible for the following:

of combustible materials, corrosive chemicals or

halogenated hydrocarbons* anywhere in the

premises.

• 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.

* 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 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.

2.3 National Standards and Applicable Codes

• To furnish all needed materials not furnished as

standard equipment.

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 plan location of supports, vents and air

intakes.

• 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.

• To ensure there is adequate air circulation

around the heater and to supply air for

combustion, ventilation and distribution in

accordance with local codes.

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 91040031) 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.

2.2 Corrosive Chemicals

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

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 3: CRITICAL CONSIDERATIONS

3.1 Basic Information

3.5 Clearances to Combustibles

UHA[X][S] heaters have automatic ignition burners

for ON/OFF operation only.

WARNING

3.2 Manufactured Units

Gas-fired, power-vented unit heater 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:

• Separated Combustion: A separated combustion

unit shall consist of an enclosed sealed burner

box to which combustion air is vented through a

piece of internal flexible air duct. This duct

terminates at an exterior cabinet flange to which

a vent ran to the outside of the heated space

should be attached.

Fire Hazard

Some objects can catch fire or explode

when placed close to heater.

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 a vent box

produced of 409 stainless steel.

Clearances must be as indicated on Page 7 , F igure

4. If clearances to combustibles are not indicated,

then installation clearances apply.

3.6 Ventilation

3.3 Location and Suspension

All models:

• Must be installed indoors.

WARNING

Carbon Monoxide Hazard

Heaters may be installed

vented or unvented.

• Must be installed in a level position with

horizontal discharge.

Vented heaters must be

vented outdoors.

• May be mounted on a shelf of non-combustible

material using shelf mounting brackets.(See

Page 1 1 , Figure 6 and Page 12, Figure 7 for

details.)

• May be suspended from above (See Page 1 1 ,

Figure 5) or from wall brackets of sufficient

strength to support the heater as listed in the

Dimension Data Table on Page 49, Section 15.1.

Drop rods must be a minimum of 3/8" diameter

mild steel. Four suspension points (3/8" nuts)

are located on top of the heater.

Unvented heaters must be

installed in buildings with

ventilation rates as per

section 6.4.

Failure to follow these

instructions can result in

death or injury.

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 code on Page

14, Section 6.

• Must be installed in a manner which allows

access to all serviceable components.

See Page 7 , F igure 4 for details.

3.4 Minimum Required Installation Clearances

Clearances around the heater and vent must be as

indicated on Page 7 , F igure 4; Page 1 7 , F igure 9

through Page 20, Figure 14 to ensure access for

servicing, and correct operation.

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SECTION 3: CRITICAL CONSIDERATIONS

3.7 Gas Supply

3.8 Electrical Supply

WARNING

Electrical Shock Hazard

Fire Hazard

Disconnect electrical and gas supply before

Connect gas supply according to Figure 15.

servicing.

Do not use gas supply pipe and electrical

connections to support heater’s weight.

This appliance must be connected to a

properly grounded electrical source.

Gas can leak if not installed properly.

Failure to follow these instructions can

result in death or electrical shock.

Failure to follow these instructions can

result in death, injury or property damage.

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

See Page 23, Section 9.

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 22, Section 8

3.9 Vent

Choose heater orientation to allow for the 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 14, Section 6.

Figure 4: Installation Clearances and Clearances to Combustibles

Clearance to Vent: 2" (5 cm)

* Recommended mounting height varies with heater input.

Heaters may be mounted at a higher level if destratification

fans are installed.

**18" (45.7 cm) minimum is

necessary for servicing.

The heater must always be installed at least 6' (2 m) above the floor.

The vent pipe must have clearance from combustibles by 2" (5 cm).

If installed at low levels where individuals can come in contact with hot heat exchanger components,

adequate guarding must be provided.

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

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 Natual 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.

• 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.

4.4 Electrical

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 accessibility

to suspended heaters for recurrent

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.

maintenance purposes.

Canada: Refer to CSA B149.1 Natural Gas and

Propane Installation Code.

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SECTION 4: NATIONAL STANDARDS AND APPLICABLE CODES

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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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 5: MAJOR COMPONENTS

5.1 General

Heaters are designed for installation above 6'

(1.8 m). These heaters must be installed within the

heated space. Duct delivery systems are not

permitted with axial fan units. When handling or

supporting the heater from below, ensure that the

weight is taken at the support points.

The gas or electrical supply lines must not be used

to support the heater.

Do not locate the gas or electrical supply lines

directly over the path of the flue products from the

heater.

The heater must be installed in accordance with

clearances to combustibles as indicated on the wall

tag and this manual.

5.2 Shelf Mounting and Suspension

WARNING

Crush Hazard

Use 3/8" threaded rod

minimum.

Failure to follow these

instructions can result in

death, injury or property

damage.

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

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

diameter mild steel.

When handling or supporting the heater from below,

ensure that the weight is taken at the support points.

For typical suspension, See Page 1 1 , Figure 5.

For typical shelf mounting on existing shelf, See

Page 1 1 , Figure 6

5.3 Wall Mounting

For typical suspension, See Page 12, Figure 7. Wall

mounted heaters blowing parallel to the wall can

only be installed with the service door away from the

wall.

The wall mounting brackets must be attached to a

suitable wall using all mounting holes. Screw sizes

less than 3/8" may not be used. In order for the wall

mounting brackets to adequately carry the weight of

the heater, it must be installed according to best

building practices.

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SECTION 5: MAJOR COMPONENTS

Figure 5: Suspension Methods

Ensure all suspension

hardware is torqued to

a minimum of 20 ft lbs.

Channel

Unistrut

Nut

Washer

Nut

3/8"

Threaded

Rod

Cone Point

Set Pin

Window

Clamp

3/8"

Threaded

Rod

Unistrut

Nut

Washer

Riv

Nut

Support Points

Figure 6: Shelf-Mounting Methods

Description

Shelf Mounting Bracket Kit

Shelf Mounting Bracket

Screw #10 x 1/2"

Type AB Phil HWH Z

Part Number

12011000K

11111510

Qty.

94311008

Shelf Mounting

Brackets

Existing cabinet screws must be re-used.

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Figure 7: Wall Shelf Mounting and Hanging Suspension

Description

Part Number

12011001K

111WALL1L

111WALL1R

111WAL2

Qty.

Description

Part Number

12011002K

12011001K

12011000K

Qty.

Wall Suspension Mounting Bracket Kit

Wall Mounting Bracket Arm Left

Wall Mounting Bracket Arm Right

Wall Mounting Bracket Vertical

Wall Mounting Bracket Diagonal

5/16" x 3 1/2" Bolt

5/16" Lock Nut with Nylon Insert

5/16" Flat Washer

5/16" Lockwasher

Wall Shelf Mounting Bracket Kit

Wall Suspension Mounting Bracket Kit

Shelf Mounting Bracket Kit

111WAL3

97213925

92114000

95211600

96411600

Hardware provided to construct mounting bracket assembly only.

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SECTION 5: MAJOR COMPONENTS

Figure 8: Vertical Louvers (Optional)

Remove horizontal

louvers.

Install vertical

louvers brackets

(top and bottom)

with supplied

screws.

Install vertical

Push in

louvers and springs

into brackets

louver and compress

spring to remove

(opposite end first)

with springs at top.

Description

Part Number Qty.

Description

Part Number

Qty.

Vertical Louver Kit UHA[X][S] 30 &

UHA[X][S] 45

Vertical Louver Kit UHA[X][S] 60 &

UHA[X][S] 75

12011003K

12011005K

Vertical Louver Bracket

#10 Screw

UHA[X][S] 30 - 45 Vertical Louvers

Louver Spring

11111903

94311008

11111901

90901200

91040036

Vertical Louver Bracket

#10 Screw

Instruction Sheet

11111903

94311008

91040036

Instruction Sheet

Description

Vertical Louver Kit UHA[X][S] 100 &

UHA[X][S] 125

Part Number Qty.

12011004K

Vertical Louver Bracket

#10 Screw

UHA[X][S] 100 - 125 Vertical Louvers

Instruction Sheet

11111903

94311008

11111902

91040036

For models UHA[X][S] 60 and UHA[X][S] 75, horizontal louvers are re-used.

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 6: VENTING

sheet metal screws.

WARNING

For single wall venting, pressure sensitive aluminum

tape or silicone sealant must be used to seal all

joints.

Carbon Monoxide Hazard

Heaters may be installed

vented or unvented.

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).

Vented heaters must be

vented outdoors.

Unvented heaters must be

installed in buildings with

ventilation rates as per

section 6.4.

6.2.1 United States Requirements

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

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

Failure to follow these

instructions can result in

death or injury.

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.

6.1 Changing Vent and Air Intake Orientation

The heater is sold with rear horizontal vent and air

intake connections as standard (only separated

combustion models have air intake connection). If

vertical vent and air intake connections are required,

follow the instructions on Page 46, Section 14.6.

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.

6.2.2 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

NFPA54/ANSI Z223.1 - latest revision, National Fuel

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

Gas and Propane Installation Code.

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.

Any portion of vent pipe passing through a

combustible wall must have a listed thimble to

conform with the above codes.

6.3 Vent Installation

Maintain clearences to combustibles at all times

for safety. Clearences are the required distances

that combustible objects must be away from the

heater to prevent serious fire hazard. See Page 7 ,

Figure 4. 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.

The heater may be installed unvented in

certain circumstances according to building

ventilation codes. Refer to the above codes and

Page 15, Section 6.4 for further information.

Unvented operation also requires compliance with

the clearances to combustibles given on Page 7 ,

Figure 4.

The bottom of the vent or air intake terminal shall not

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

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 1 7 , F igure 9 through Page 20,

Figure 14. 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 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"

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SECTION 6: VENTING

Vents and air intakes must be adequately

supported so that the heater does not bear the

weight of the pipes.

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

WARNING: Combustion by-products contain a

For vent termination See Page 1 7 , F igure 9 through chemical known to the State of California to cause

Page 20, Figure 14.

cancer and birth defects or other reproductive harm.

6.3.1 Standard Vented Heaters

(Models UHA[X] 30 - 125)

The vent must be fitted with a low resistance

terminal. See Page 1 7 , F igure 9 through Page 1 7 ,

Figure 10. 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) 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 UHA[X]S 30 - 125)

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 19, Figure 12. 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 19,

Figure 13 and Page 20, Figure 14.

For seperated 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

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).

In the State of Massachusetts, the following

regulations apply to horizontally-vented heaters

certified for installation in structures used in whole or

in part for residential purposes (UHA 30-75 only)

and where the side wall exhaust vent termination is

less than seven (7) feet above finished grade in the

area of the venting, including but not limited to decks

and porches:

Seperated combustion units may not be common

vented. See Page 14, Section 6

6.4 Unvented Operation

Installation of Carbon Monoxide Detectors: At the

time of installation of the side wall horizontal vented

gas fueled equipment, the installing plumber or

gasfitter shall observe that a hard wired carbon

monoxide detector with an alarm and battery back-

up is installed on the floor level where the gas

equipment is to be installed. In addition, the

installing plumber or gasfitter shall observe that a

battery operated or hard wired carbon monoxide

detector with an alarm is installed on each additional

level of the dwelling, building or structure served by

the side wall horizontal vented gas fueled

WARNING

Carbon Monoxide Hazard

Heaters may be installed

vented or unvented.

Vented heaters must be

vented outdoors.

Unvented heaters must be

installed in buildings with

ventilation rates as per

section 6.4.

equipment. It shall be the responsibility of the

property owner to secure the services of qualified

licensed professionals for the installation of hard

wired carbon monoxide detectors

Failure to follow these

instructions can result in

death or injury.

•

In the event that the side wall horizontally

vented gas fueled equipment is installed in a

crawl space or an attic, the hard wired carbon

monoxide detector with alarm and battery back-

up may be installed on the next adjacent floor

level.

The heater must be vented when installed in

residential buildings.

For unvented operation in commercial installations,

sufficient ventilation must be provided in the amount

of 4 cfm per 1000 Btu/h firing rate (United States); 3

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

• In the event that the requirements of this

subdivision can not be met at the time of

completion of installation, the owner shall have a

period of thirty (30) days to comply with the

above requirements; provided, however, that

during said thirty (30) day period, a battery

operated carbon monoxide detector with an

alarm shall be installed.

6.7 Length Requirements

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.

The entire vent should be insulated with foil faced

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

minimum).

6.7.1 Maximum Vent Lengths

Approved Carbon Monoxide Detectors: Each carbon

monoxide detector as required in accordance with

the above provisions shall comply with NFPA 720

and be ANSI/UL 2034 listed and IAS certified.

Signage: A metal or plastic identification plate shall

be permanently mounted to the exterior of the

building at a minimum height of eight (8) feet above

grade directly in line with the exhaust vent terminal

for the horizontally vented gas fueled heating

appliance or equipment. The sign shall read, in print

size no less than one-half (1/2) inch in size, “GAS

VENT DIRECTLY BELOW. KEEP CLEAR OF ALL

OBSTRUCTIONS”.

Model UHA[X][S]

Number of Elbows

30 - 60

75 - 125

25 ft (7.6 m)

20 ft (6.1 m)

15 ft (4.6 m)

10 ft (3.0 m)

5 ft (1.5 m)

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 14, 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.

Inspection: The state or local gas inspector of the

side wall horizontally vented gas fueled equipment

shall not approve the installation unless, upon

inspection, the inspector observes carbon monoxide

detectors and signage installed in accordance with

the provisions of 248 CMR 5.08(2)(a)1 through 4.

6.6 Vertical Venting

Vertically vented heaters can be common vented

(up to four heaters).

6.9 Replacing an Existing Heater in a Venting

System

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

condensation will form. Insulation is recommended

and condensation drains may be desired. Venting

through the top of the heater cabinet is not

recommended if vent lengths are longer than 10'

(3 m). In this case, 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.

Vent pipe must be sloped 1/4'' (.6 cm) for every 1' (.3

m).

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.

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.

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

(P/N 90502102) must be used.

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

(P/N 90502103) must be used.

For common vertical venting of more than two

heaters, See Page 18, Figure 1 1.

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

highest point where it passes through a flat roof of a

building.

3. Close all building doors and windows and all

doors between the space in which the

appliance(s) connected to the venting system

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SECTION 6: VENTING

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.

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).

4. Follow the lighting instructions. Place the

appliance being inspected in operation. Adjust

thermostat so that the appliance will operate

continuously.

Figure 9: Vent and Roof Detail

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

draft hood appliance spillage at the draft hood

relief opening after 5 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

determine minimum size. All vent corrections

Figure 10: Standard Vented Heater - Vertical and Horizontal Vent Termination

NOTE: Vent supports not

Vent Terminal

shown.

Flashing

(By Others)

Listed

Thimble

(2" [5 cm]

Listed

Clearance)

Thimble

4" (10 cm)

Diameter Vent

(2" [5 cm] Clearance)

Flashing

(By Others)

Vertical

Option

Horizontal

Option

Vent

Terminal

Vent

12" (31 cm)

Minimum

Model

Vent Diameter

Part Number

UHA[X] 30 - 125

4" (10 cm)

90502102

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Figure 11: Standard Vented Heater - Common Vertical Vent Termination

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SECTION 6: VENTING

Figure 12: Separated Combustion Heater - Vertical and Horizontal Vent Termination

12" (31 cm)

Minimum from air inlet to vent

termination (may be horizontal

or vertical clearance).

12" (31 cm)

Minimum from wall

to vent termination.

NOTE: Vent supports not

shown.

(10 cm)

Diameter Vent

4" (10 cm) Diameter

Air Intake

Listed Thimble

12" (31 cm)

through

Minimum from wall

Combustible Wall

to vent termination.

4" (10 cm)

Diameter Vent

Vertical

Option

Vent

Termination

Air Intake

Termination

4" (10 cm)

Diameter

Air Intake

12" (31 cm)

Minimum from air inlet to vent

termination (may be horizontal

or vertical clearance).

Model

Air Intake & Vent Diameter Part Number

Horizontal

Option

UHA[X]S 30 - 125

4" (10 cm)

90502102

Figure 13: Concentric Vent Box

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

Vent Box

to Heater

Use 3 sheetmetal

screws equally

Exhaust

from Heater

spaced around joint.

spaced around collar.

4" (10 cm) Single

Wall Vent Pipe

(By Others)

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Figure 14: Concentric Vertical and Horizontal Vent Termination - Separated Combustion Heater

NOTE: Vent supports not

Vent Terminal

with Baffle Plate

shown.

4" (10 cm)

Type B-1

Vent

Storm Collar (By Others)

(Attach with 3 sheet metal screws.)

6" (16 cm)

Diameter

Single Wall

Combustion

Air Terminal

Flashing

(By Others)

Concentric

Vent Box

6" (16 cm)

Minimum

4" (10 cm) Diameter

Air Intake

12" (31 cm)

Maximum

4" (10 cm)

Diameter

Vent

Vertical

Option

10' (3 m)

Maximum

4"(10

cm)

Vent Terminal

with Baffle Plate

4" (10 cm)

Diameter

Vent

Type

B-1

Vent

Horizontal

Option

4" (10 cm)

Diameter

Vent

Concentric

Vent Box

Storm Collar (By Others)

(Attach with 3

sheet metal screws.)

Combustion

Air Terminal

Description

Concentric Vent Kit

Part Number

UHVK1

Qty.

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" (16 cm) Combustion Air Terminal

90504113

90504112

91119100

90502102R

90502103

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SECTION 7: AIR SUPPLY

7.1 Separated Combustion Installation

When installed as a separated combustion heater

(UHA[X]S), the air for combustion is drawn in from

outside the building. It is important to ensure that

there is adequate space around heater to provide air

for the axial air distribution fan.

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 (UHA[X]S) 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 16, Section

6.7.

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UHA LOW PROFILE UNIT HEATER 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.

WARNING

• 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 15.

• 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.

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).

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.

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.

8.1 Connections

Connect the heater to the gas supply ensuring that

the final connections are as follows:

Figure 15: Gas Connection

• Hold gas nipple

securely with pipe

wrench when attaching

the flexible gas

Do not bend flexible

gas connector

sharply.

Option A:

Stainless Steel

Flexible Gas

Connector

connector.

• Do not twist flexible

gas connector.

Option B:

• Ensure all

joints are

gas tight.

Medium or Heavy

Gauge Pipe

Gas Shut-off Valve

Gas Connector

Drip Leg

Cap

Union

Connection

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SECTION 9: WIRING

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

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 5, Section 2.1 for wall tag details.

Electrical Shock Hazard

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.

9.1.1 Fan Control

All heater models require constant 120 V/1Ø/ 60 Hz The heater’s axial fan can be used during the off-

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.

season for air circulation. A low-voltage

programmable thermostat with a fan switch (P/N

90425400) must be See Page 23, Section 9.2.

used. For thermostat connection details. For the use

of multiple heaters on one thermostat, See Page 24,

Section 9.3 through Page 25, Section 9.4

All heaters are equipped with thermostat

connections suitable to power a 24 V thermostat.

Heater must be wired and electrically grounded in

accordance with local codes. In the absence of local

9.2 Low Voltage Thermostat with One Heater

24 Volt

Thermostat

Heating

Only

Terminal

Strip

Gas

Supply

Electrical

Supply

24 Volt

Thermostat

with Fan

Control

Terminal

Strip

Gas

Supply

Electrical

Supply

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

9.3 Low Voltage Thermostat with Multiple Heaters 30 - 45

Model

UHA[X][S] 30 - 45

Relay Type

Relay Part Number Max. Number of Heaters

90417600

SPST

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SECTION 9: WIRING

9.4 Low Voltage Thermostat with Multiple Heaters 60 - 125

Model

UHA[X][S] 60 - 125

Relay Type

Relay Part Number Max. Number of Heaters

90436300

DPST

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

9.5 Internal Wiring Diagram

AXIAL FAN (UHA 300,

AXIAL FAN

350, 400) ONLY)

Black

L2 L1

Green

White

Green

White

Black

White

Black

FLUE

BLOWER

Black

White

Green

GAS VALVE

Black

TRANSFORMER

White

Green

Blue

Yellow

Blue

Brown

PRESSURE

SWITCH

Blue

LIMIT

Orange

R = 24 VAC TO THERMOSTAT (RED)

SWITCH

(UHA

Orange

G = MANUAL FAN INPUT FROM THERMOSTAT (GREEN)

W = HEAT DEMAND INPUT FROM THERMOSTAT (WHITE)

C = COMMON SIDE OF TRANSFORMER

Orange

300,350,

400 ONLY)

MANUAL RESET LIMIT SWITCH

LIMIT

SWITCH

IGNITION

MODULE

(UHA 30 - 125 ONLY)

THERMOSTAT INPUT:

FIELD SUPPLIED

Black

SENSE

ELECTRODE

Black

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 volts. For supply connections, use No. 14 AWG or larger wires.

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SECTION 9: WIRING

9.6 Ladder Wiring Diagram

120 VAC

UHA (300, 350, 400 Only)

AXIAL FAN

FLUE BLOWER

TRANSFORMER

GAS VALVE

PRESSURE SWITCH

FLAME

SENSOR

IGNITION

MODULE

Flame

Limit Switch (UHA 300,

Limit Switch

350, 400 Only)

Manual Reset Limit Switch

ELECTRODE

Spark

(UHA 30 - 125 Only)

THERMOSTAT

CONNECTION

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 volts. For supply connections, use No. 14 AWG or larger wires.

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

9.7 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

SECTION 10: OPERATION AND MAINTENANCE 10.1.2 Electrical Checks

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

start-up the heater.

1. Check that all site wiring is connected in

accordance with the appropriate wiring diagram

on Page 26, Section 9.5.

WARNING

10.1.3 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.

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.

10.1.4 Mechanical Checks

1. Check that the fan is free to run and delivery

louvers are turned to give required air

deflection.

Failure to follow these instructions can

result in death, injury or property damage.

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

combustion units) is installed in accordance

with these instructions and local regulations.

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.

10.2 Begin Start-Up

10.2.1 Before Operating the Heater

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.

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.

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 30, Figure 16.

There will be no ignition of the burner and lockout

will occur, which proves the controls are operating

correctly.

10.1.1 Louvers

WARNING

Cut Hazard

Turn off gas and electrical supply before

maintenance.

Fan can start automatically at any time.

Failure to follow these instructions can

result in severe injury or product damage.

Where fitted, the air delivery louvers need to be set

during start-up to give the required air distribution

(optional vertical louvers).

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Figure 16: 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

Axial Fan

30 Seconds Delay

90 Seconds Delay

*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 17: Gas Valve for Models UHA[X][S] 30 - 45

Pressure Regulator

Gas Outlet

Description

Gas Valve 30 - 45 NG

Gas Valve 30 - 45 LP

Part Number

90034500

90034600

Outlet Pressure

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SECTION 10: OPERATION AND MAINTENANCE

Figure 18: Gas Valve for Models UHA[X][S] 60 - 125

END VIEW

TOP VIEW

Regulator

OFF

Outlet

Gas Inlet

Pressure

Description

Gas Valve 60 - 125 NG

Gas Valve 60 - 125 LP

Part Number

90032505

90032506

Inlet Pressure

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.

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. 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 50, Section 15.3.

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.

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 50, Section 15.3 for inlet pressure

requirement.

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.

Do not continue to adjust the regulator if the

pressure is not changing.

The fan will continue to run for 90 seconds.

Do not use a disconnect switch for control of

heater. Disconnect switch will turn off the fan.

If the inlet pressure is too low to allow correct burner

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Heat exchanger could be damaged. Warranty will

not cover damage to the heat exchanger if

operated improperly. Only use the disconnect

switch for turning off heater for service or during

off-season.

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

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.

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 7 , F igure 4 and the user

instructions on Page 6, Section 3 and Page 33,

Section 1 1 and all warnings defined in this manual.

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SECTION 11: USER INSTRUCTIONS

11.3 Common User Controls

11.3.1 Manual Reset Limit Switch

WARNING

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.

Do not make more than one attempt to

restart the heater if manual reset limit switch

locks out.

Turn off gas and electrical supplies before

performing service or maintenance.

The vent or heat exchanger may be blocked.

The fault must be traced and repaired.

Failure to follow these instructions can

result in death, injury or property damage.

Failure to follow these instructions can

result in death, injury or property damage.

11.1 User Instructions

The UHA[X][S] Series heaters are fully automatic

and operate from the external controls fitted on site.

The only user control at the heater is the Manual

On residentially approved models, the limit

thermostat is located inside the access door of the

heater. See Page 44, Section 14.3. This control

protects against excessive heat build-up inside the

burner compartment.

Reset Limit Switch - See Page 33, Section 1 1 .3.1

11.2 Heater Operation

Figure 19: Manual Reset Limit Switch

When the heater has been switched on by the

thermostat installed on site, the main burner will

automatically turn on.

Reset Button

The burner control box will control the safe ignition

of the flame.

All heaters require a constant gas and electricity

supply which must not be interrupted during the

normal operation of this heater.

To reset manual reset limit switch, press reset

button. NOTE: To reset, the switch must be cool.

Description

Part Number

Manual Reset Limit Switch

90412106

11.4 Lighting Instructions

11.4.1 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".

IMPORTANT: The thermostat setting must be above

the ambient temperature for the heater to operate.

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

2. The automatic firing sequence will begin as

described on Page 30, Figure 16. The heater

will now operate automatically under the control

of the on site controls.

11.4.2 To Turn the Heater Off

Set the thermostat to the "OFF" position.

The burner will turn off immediately.

The fan will continue to run for 90 seconds.

To restart, turn the thermostat above room

temperature.

11.5 Simple Troubleshooting

Some possible reasons for the heater not operating

are:

1. Gas supply not "ON".

2. Electricity supply not "ON".

3. The time and/or temperature controls are not

"ON".

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.

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.

11.5.1 Simple Troubleshooting (Burner Faults)

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 34, Figure 20 for LED

indication codes.

Figure 20: 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.

Ignition Lockout - No flame detected.

Airflow Fault - Pressure switch open or closed.

Temperature Limit or

Manual Reset Limit Switch Open

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 Fan/Motor Assembly Maintenance

WARNING

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.

Cut Hazard

Turn off gas and electrical supply before

Failure to follow these instructions can

result in death, injury or property damage.

maintenance.

Fan can start automatically at any time.

12.1 Servicing Instructions

Failure to follow these instructions can

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.

result in severe injury or product damage.

The main fan bearings are permanently sealed and

do not need lubrication. Before cleaning, turn off gas

and electrical supply. Remove the fan and use a

small brush or duster to clean the fan blades from

each side. Replace fan when done.

IMPORTANT: After any maintenance or repair work,

always test fire the heater in accordance with the

start-up instructions on Page 29, Section 1 0 through

Page 32, Section 1 0 .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 38, Section 13

through Page 41, Section 13.5.

12.4 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.

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.

12.5 Gas Valve Maintenance

No regular maintenance is required on this device.

To change gas control valves, See Page 42, Section

14.1 .

IMPORTANT: Inspect all suspended components

and hardware. Ensure that they are in good

condition, properly tightened, and corrosion free

Do not repair or disassemble gas valve.

Replace faulty gas valves with replacement parts

sold and supplied by Roberts-Gordon.

12.2 Burner Maintenance

1. Open the door and remove the burner

compartment cover. See Page 43, Section

14.2.

12.6 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 46,

Section 14.6). Ensure that the fan is free to run and

that the fan wheel is clean.

2. Clean any deposits from the main burner which

may have formed in the injectors or venturi of

the burner. See Page 43, Section 14.2.

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

12.7 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

condition. Replace as required. Check all venting

and air intake components to ensure they are in

good condition, gas tight and corrosion-free.

12.8 Maintenance Checklist

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 equipment

sold and supplied by Roberts-Gordon and conform

to all requirements set forth in the ROBERTS

GORDON^®manuals and all applicable

WARNING

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.

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.

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 6, 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 or in the louvers.

Immediately remove objects in violation of the clearances to combustibles.

See Page 6, 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 21, Section 7.

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SECTION 12: SERVICING

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 22, Section 8.

Gas Line and Shut-off

Valves

Check for gas leaks. See Page 22, 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 29, Section 1 0.

Suspension Points

Make sure the heater is hanging securely.

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

See Page 1 1 , Figure 5.

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.

Wall Tag

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

Roberts Gordon LLC or ROBERTS GORDON® independent distributor if you

need a wall tag. See Page 5, Section 2.1.

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 13: TROUBLESHOOTING

13.1 General

WARNING

START

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.

UHA 30 - 75: Press in reset

button on manual reset limit

switch. UHA 100 - 125: Wait

10 - 15 minutes for limit

switch to cool. Does fan

stop running?

Yes

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”?

Replace limit switch.

Limit Switch Figure.

Yes

Use Troubleshooting for

Automatic Ignition Burner

Systems section to test burner.

Ensure proper air flow

clearance for axial fan.

Open louvers slightly.

Replace axial fan if it does

not operate.

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

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

Conduct start-up procedure as shown on Page 29, Section 10.

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UHA LOW PROFILE UNIT HEATER 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 29, Section 10.

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 14: REPLACEMENT PARTS

14.1 Gas Valve

Remove the gas supply pipe at the heater inlet.

Follow steps in Section 14.2 and Section 14.2.1 to

remove gas valve/manifold.

WARNING

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 31, Section 1 0 .2.2.

IT IS IMPORTANT THAT ONLY THE CORRECT

GAS VALVE IS USED WHEN REPLACING THESE

CONTROLS.

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.

See warnings and notes on Page 35, Section 12

before removing or replacing parts.

Burner Components

All serviceable burner parts are accessed by the

door on the side of the heater. Remove the

sheetmetal screws.

NOTE: Seperated combustion

model shown.

Flexible Air Duct

OFF

Description

Part Number

90034500

90034600

90032505

90032506

Gas Valve, NG (Models UHA[X][S] 30 - 45)

Gas Valve, LP (Models UHA[X][S] 30 - 45)

Gas Valve, NG (Models UHA[X][S] 60 - 125)

Gas Valve, LP (Models UHA[X][S] 60 - 125)

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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

Viewing port

for flame probe

Flame Probe

Ignition Electrode

Remove flexible

air duct from spigot

NOTE: Separated combustion

model shown.

Remove screws and

pull off burner cover

14.2.1 Burner Injectors

Ensure gas tight fitting of

Manifold

injectors.

Ensure correct alignment

with burners.

Remove manifold

screws and pull

Ensure all pipe joints are

gas tight.

out manifold

Manifold

Inshot

Burners

Unscrew

Orifices

Manifold

Mounting

Bracket

Grommet

Marking

Folded

Hem

MODEL

UHA[X][S] 30 UHA[X][S] 45 UHA[X][S] 60 UHA[X][S] 75 UHA[X][S] 100 UHA[X][S] 125

Orifice Quantity

Natural Gas (G20)

Orifice Marking

P/N

91930049

91930046

Propane (G31)

Orifice Marking

P/N

1.15 mm

1.25 mm

1. 25 mm

91930056

91930115

91930125

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

14.3 Ignition Electrode and Flame Probe

Inshot

Burners

Manual Reset

Limit Switch

(Position may vary.)

Flame

Probe

Flame

Probe

Limit

Switch

Burner Compartment

Front Views

Ignition

Electrode

Ignition

Electrode

.120

(3 mm)

spark

gap

Inshot

Burners

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 UHA[X][S] 30

Inshot Burners UHA[X][S]45

Inshot Burners UHA[X][S] 60

Inshot Burners UHA[X][S] 75

Inshot Burners UHA[X][S] 100

Inshot Burners UHA[X][S] 125

Limit Switch

Part Number

90427411

90439300

90436900K

90434008

92000002

90412104

90412106

Qty

Manual Reset Limit Switch

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SECTION 14: REPLACEMENT PARTS

14.4 Heat Exchanger

The heat exchanger consists of a four-pass design with 1.5" outer diameter [aluminized steel][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 Louver and Louver Springs

Horizontal

Louvers

Vertical

Louvers

Horizontal

Louvers

Vertical

Louvers

Install Vertical

Louver Brackets

(top and bottom)

with supplied

Install Vertical

screws.

Louver Brackets

(top and bottom)

with supplied

screws.

Install Vertical

Push in

Louvers and Springs

into Brackets

Louver and compress

spring to remove

with Springs at Top

Install Vertical

(opposite end first)

Push in

Louvers and Spring

into Brackets

Louver and compress

spring to remove

with Springs at Top

For models UHA[X][S] 60 and UHA[X][S] 75, horizontal louvers are re-used.

(opposite end first)

UHA[X][S] UHA[X][S] UHA[X][S]

Description

Vertical Louver Kit UHA[X][S] 60

& UHA[X][S] 75

Vertical Louver Bracket

UHA[X][S] 60 - 75 Vertical Louvers

Instruction Sheet

Part Number

12011005K

Qty.

Description

30 - 45

60 - 75

11111900

91901200

100 - 125

Horizontal Louvers P/N

Spring P/N

Quantity

#10 Screw

Description

Part Number

12011003K

Qty.

Vertical Louver Kit UHA[X][S] 30

& UHA[X][S] 45

Description

Vertical Louver Kit UHA[X][S] 100 &

UHA[X][S] 125

Vertical Louver Bracket

UHA[X][S] 100 - 125 Vertical Louvers

Instruction Sheet

Part Number

12011004K

Qty.

Vertical Louver Bracket

UHA[X][S] 30 - 45 Vertical Louvers

Louver Spring

Instruction Sheet

#10 Screw

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

14.6 Flue Blower Vertical Installation

To remove the blower,

remove screws securing the

fan and mounting plate to

the vent box.

To remove the blower from

the mounting plate, remove

screws.

Intake &

Exhaust

Covers

Mounting Plate

to Vent Box

Refit in reverse order.

To change the vent and air

intake orientation from back

to top, remove the blower

and mounting plate as

above.

fixing screws

Air Intake

Adaptor

Gaskets

Vent Box

Mounting Plate

to Flue Blower

screws

Remove intake (if

applicable) and exhaust

covers from top of the

heater.

Air Intake Adapter

Intake &

Exhaust

Covers

Rotate the blower, mounting

plate and gasket clockwise

until the flue adapter lines

up with the top hole. Secure

screws.

Gasket

If applicable, remove the

flexible air duct from the air

intake adapter on the back.

Flexible Air

Duct

If applicable, remove the air

intake adapter from the back

of the heater and install in

the appropriate hole on top.

Reconnect the flexible air

duct.

Mounting Plate

to Vent Box

fixing screws

Install intake and exhaust

covers over the back holes.

NOTE: Seperated combustion model shown.

MODEL

Flue Blower P/N

UHA[X][S] 30 -75

90710404

UHA[X][S] 100 - 125

90710405

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 an flue blower. See Page 33, Section 1 1.

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SECTION 14: REPLACEMENT PARTS

14.7 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 29, Section 1 0.

MODEL

UHA[X][S] 30

UHA[X][S] 45

UHA[X][S] 60

UHA[X][S] 75

UHA[X][S] 100 UHA[X][S] 125

Pressure Switch

Kit P/N

90439801

pink

90439810

black

90439802

yellow

.32

90439810

black

90439810

black

90439803

gray

Color Code

.23

.35

.41

Set Point in. wc

Pressure Switch

Snap Ring P/N

90439850

14.8 Ignition Control

The control mounts to the heat exchanger 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.

14.9 Axial Fan/Guard/Motor Assembly

The axial fan unit for the heater is supplied completely assembled and balanced.

MODEL

UHA[X][S] 30

91901103

UHA[X][S] 45

91901103

UHA[X][S] 60

91901102

UHA[X][S] 75

91901102

UHA[X][S] 100 UHA[X][S] 125

Axial Fan Guard

Axial Fan Motor

Axial Fan Blade

91901102

90600106

90709001

91901102

90600106

90709001

90600104

90600105

90709004

90709003

90709002

90709001

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

14.9.1 Fan Removal and Replacement

Remove the mounting hardware.

Remove the screws

and washers.

Description

Part Number Quantity

Axial Fan UHA[X][S] 30

Axial Fan UHA[X][S] 45

Axial Fan UHA[X][S] 60

Axial Fan UHA[X][S] 75

Axial Fan UHA[X][S] 100 and UHA[X][S]

125

12011910

12011911

12011920

12011921

12011922

14.9.2 To Replace the Fan Assembly

To replace the fan assembly, reverse the procedure

shown above.

• Check that the fan blades are free to rotate

before turning on the power to the fan.

• Strictly comply with the color code of the fan

wires to ensure correct operation. See Page 26,

Section 9.5 wiring diagram.

• Use only replacement parts sold and supplied

by Roberts-Gordon.

14.10 Limit Switches

14.10.1 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

UHA[X][S]

UHA[X][S] UHA[X][S]

UHA[X][S]

125

MODEL

100

17.75

'A' Height

(cm)

(30.48)

(45.09)

(58.42)

'C' Center of Flue [Top

Option]

(cm)

5.2

(13.21)

5.2

(13.21)

5.2

(13.21)

5.2

(13.21)

6.9

(17.53)

6.9

(17.53)

(cm)

2.5

(6.35)

2.5

(6.35)

2.5

(6.35)

2.5

(6.35)

2.5

(6.35)

2.5

(6.35)

'D' Center of Flue

Recommended Mounting

Height to Heater Base

(m)

(3.05)

(3.66)

(6.10)

TOP VIEW

17.63"

(45 cm)

4 x 3/8" Captive Nuts Provided

Air Intake

(UHA[X]S only; Optional Position)

18.25"

16.63"

(42 cm)

(46 cm)

Flue

(Optional Position)

(15 cm)

6.75"

(17 cm)

SIDE VIEW

20.25"

25.5"

(65 cm)

REAR VIEW

Flue

(51 cm)

(15 cm)

6.75"

(17 cm)

Air

Intake

(15 cm)

Thermostat

Connection

(UHA[X]S

only)

1.8"

(5 cm)

Gas Supply

Electrical

Supply

1.5" (4 cm)

3.3"

(8 cm)

28.5"

(72 cm)

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

15.2 General Technical Data Table (All Models)

UHA[X][S] UHA[X][S]4 UHA[X][S] UHA[X][S] UHA[X][S] UHA[X][S]

Model

100

125

Low Profile UHA[X][S] Axial Fans

Full Load Amps @ 115 V

Air Volume

3.0

4.1

5.8

CFM

691

1376

1902

Flue and Air Intake

Flue and Air Intake Size

in (cm)

4 (10) - All Models

25 (7.6) 25 (12.2)

*Maximum Straight Flue/Air Intake ft (m)

25 (7.6)

40 (12.2)

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

15.3 Technical Data Table (All Models)

UHA[X][S] UHA[X][S] UHA[X][S] UHA[X][S]

UHA[X][S]

100

UHA[X][S]

125

Model

Total Input

Total Output

Efficiency

(Btu/h) x (1000)

100

125

24.6

36.9

49.2

61.5

102.5

82 - All Models

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

Burner Pressure in wc 3.7 3.6

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

Burner Pressure in wc 9.4 9.6

3.7

3.5

2.6

9.1

3.3

9.6

10.0

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SECTION 16: ROBERTS GORDON^®COMBAT^®UHA-SERIES WARRANTY

The ownership of the ROBERTS GORDON^®COMBAT^®

UHA-Series is moved or transferred. This warranty is

nontransferable.

Roberts-Gordon is not permitted to inspect the damaged

controller and/or component parts.

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

1250 William Street

P. O. B ox 4 4

ROBERTS GORDON^®WILL PAY FOR:

Within 24 months from date of purchase by buyer or 27

months from the 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.

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^®UHA-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.

Claims where the total price of the goods have not

been paid.

Roberts-Gordon' 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.

Damage due to:

• Improper installation, operation or maintenance.

• Misuse, abuse, neglect, or modification of the

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

way.

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

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^®UHA-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^®UHA-Series as directed in the

Installation, Operation and Service manual.

• Relocation of the ROBERTS GORDON^®COMBAT^®

UHA-Series after initial installation

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

Series in a corrosive atmosphere containing

contaminants.

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

Series in the vicinity of a combustible or explosive

material.

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

UHA-Series arising from a drawing, design, or

specification supplied by or on behalf of the

consumer.

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.

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^®UHA-Series is not

installed by a contractor qualified in the installation and

service of gas-fired heating equipment.

You cannot prove original purchase date and required

annual maintenance history.

The data plate and/or serial number are removed,

defaced, modified or altered in any way.

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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, except for models UHA[X][S] 30 - UHA[X][S] 75.

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

IFTHE HEATER WILL NOT OPERATE, TO ENSUREYOUR SAFETY,

close to heater.

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.

Failure to follow these instructions can result in death,

injury or property damage.

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

of gas-fired heating equipment.

Installation Clearances

Clearances to Combustibles

Roof Terminal

Top

(Optional separated

combustion concentric

venting shown.)

Left

Right

Top*

10'

(3 m)

Bottom

Wall

Terminal

Rear*

Max. Mounting Height*

Models 30 - 125

Models 150 - 400

150 - 400

6" (15 cm)

3" (8 cm)

31" (79 cm)*

6" (15 cm)

2" (5 cm)

30 - 125

1" (2.5 cm)

0" (0 cm)

1" (2.5 cm)

18" (46 cm)*

2" (5 cm)

Models

Top

Bottom

Right

Left

30 - 125

1" (2.5 cm)

18" (46 cm)

*Models

Top

150 - 400

6" (15 cm)

24" (61 cm)

Rear

Max Mounting Height¹

12' (3.7 m) - 20' (6 m)

20' (6 m) - 30' (9 m)

¹Heaters can be mounted higher if destratification fans are installed. See Installation, Operation

and Service Manual for specific mounting height recommendations.

NOTE: Venting directly from top of heater not applicable on Models 150-400.

Vent

* Clearance needed for servicing.

Roberts-Gordon, LLC

Telephone: 716.852.4400

Fax: 716.852.0854

Toll Free: 800.828.7450

1250 William Street

P.O. Box 44

Buffalo, NY 14240-0044 USA

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.

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

Models 100-400 are not for residential use.

www.rg-inc.com

Printed in U.S.A.

P/N 91040031 Rev B

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