Roberts Gorden UHA-XS60, UHA-XS75, UHA-XS100, UHA-XS30, UHA-XS125 User Manual

...

Page 1

WARNING

Installation must be done by a contractor qualified in the installation and service of gas-fired heating equipment or your gas supplier.

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.

Installer

Please take the time to read and understand

these instructions prior to any installation.

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

Owner

Keep this manual in a safe place in order to provide

your serviceman with necessary information.

Combat

UHA-Series

Tubular Unit Heaters

(Low Profile Range)

Installation, Operation

& Service Manual

Models UHA[X][S]

30, 45, 60, 75, 100, 125

Quality in Any Language™

Roberts-Gordon LLC

1250 William Street P. O . B o x 44 Buffalo, New York 14240-0044 Telephone: 716.852.4400 Fax: 716.852.0854 Toll Free: 800.828.7450

www.rg-inc.com

P/ N 111100NA 11/08 Rev D

Page 2

Page 3

Roberts-Gordon LLC

All rights reserved. No part of this work covered by the copyrights herein may be reproduced 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.

TABLE OF CONTENTS

SECTION 1: Heater Safety...................................................... 1

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

1.2 Safety Labels and Their Placement ............................. 1

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

2.1 Wall Tag .......................................................................5

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

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

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

3.1 Basic Information ......................................................... 6

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

3.3 Location and Suspension ............................................6

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

3.5 Clearances to Combustibles ........................................6

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

3.7 Gas Supply..................................................................7

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

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

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

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

4.2 Aircraft Hangars...........................................................8

4.3 Parking Structures and Repair Garages ......................8

4.4 Electrical ......................................................................8

4.5 Venting......................................................................... 8

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

SECTION 5: Major Components.......................................... 10

5.1 General...................................................................... 10

5.2 Shelf Mounting and Suspension................................ 10

5.3 Wall Mounting ............................................................ 10

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

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

6.2 Venting....................................................................... 14

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

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

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

6.6 Vertical Venting.......................................................... 16

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

6.8 Vent Material.............................................................. 16

6.9 Replacing an Existing Heater in a Venting System.... 16

SECTION 7: Air Supply......................................................... 21

7.1 Separated Combustion Installation............................. 21

7.2 Unvented Installation..................................................21

7.3 Building Ventilation..................................................... 21

7.4 Outside Combustion Air Supply.................................. 21

SECTION 8: Gas Piping........................................................22

8.1 Connections...............................................................22

SECTION 9: Wiring................................................................23

9.1 Positioning Thermostats ............................................ 23

9.2 Low Voltage Thermostat with One Heater .................23

9.3 Multiple Heater Wiring 30 - 45 ...................................24

9.4 Multiple Heater Wiring 60 - 125 .................................25

9.5 Internal Wiring Diagram ............................................. 26

9.6 Ladder Wiring Diagram..............................................27

9.7 Electrical Connection to the Heater ...........................28

SECTION 10: Operation and Maintenance..........................29

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

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

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

SECTION 11: User Instructions............................................33

11.1 User Instructions.......................................................33

11.2 Heater Operation ......................................................33

11.3 Common User Controls.............................................33

11.4 Lighting Instructions..................................................33

11.5 Simple Troubleshooting.............................................34

SECTION 12: Servicing.........................................................35

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

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

12.3 Fan/Motor Assembly Maintenance...........................35

12.4 Heat Exchanger Maintenance ..................................35

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

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

12.7 Venting and Air Intake Pipe......................................36

12.8 Maintenance Checklist.............................................36

SECTION 13: Troubleshooting .............................................38

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

13.2 Troubleshooting For Automatic Ignition

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

13.3 Troubleshooting for Flame Supervision System .......40

13.4 Troubleshooting for Gas Valves................................41

13.5 Troubleshooting for Flue Blower...............................41

SECTION 14: Replacement Parts.........................................42

14.1 Gas Valve .................................................................42

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

14.3 Ignition Electrode and Flame Probe .........................44

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

14.5 Louver and Louver Springs......................................45

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

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

14.8 Ignition Control .........................................................47

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

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

SECTION 15: Specifications.................................................49

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

15.2 General Technical Data Table (All Models) ..............50

15.3 Technical Data Table (All Models) ............................50

SECTION 16: ROBERTS GORDON® COMBAT

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

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 ............................................... 11

Figure 6: Shelf-Mounting Methods.......................................... 11

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

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

Figure 9: Vent and Roof Detail ................................................ 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 ..................................................... 22

Figure 16: Automatic Burner Control Sequence...................... 30

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

Figure 18: Gas Valve for Models UHA[X][S] 60 - 125..............31

Figure 19: Manual Reset Limit Switch.....................................33

Figure 20: LED Diagnostic Codes........................................... 34

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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.

SECTION 1: HEATER SAFETY

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 obtain replacement signs or labels.

independent distributor to

See Page 2,

Figure 1 through Page 4, Figure 3.

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Description Part Number

Logo Label 91040030 Cut Hazard Label 91010430 Vent Length Label 91039505 Vent to Outdoors Label 91010427 Warning Label 91010429 Rating Plate Label 91010420 Installation Label 91010431 Instruction Location Label 91010433 Lighting Instruction Label 91010425 Venting Arrangement Label* 91010426 Manual Reset Switch Label 91010428

Figure 1: UHA 30 - 45 Label Placement

Page 9

Figure 2: UHA 60 - 75 Label Placement

Description Part Number

* For separated combustion units only

SECTION 1: HEATER SAFETY

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Description Part Number

* For separated combustion units only

Figure 3: UHA 100 - 125 Label Placement

VENT TO OUTDOORS DONNER VENT A DEHORS

Printed in U.S.A. / Imprimé aux Etats Unis

P/N 91010427

Page 11

SECTION 2: INSTALLER RESPONSIBILITY

The installer is responsible for the following:

• 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.

• To use the information given in a layout drawing and in the manual together with the cited codes and regulations to perform the installation.

• To install the heater in accordance with the clearances to combustibles.

• To furnish all needed materials not furnished as standard equipment.

• To plan location of supports, vents and air intakes.

• 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.

SECTION 1: HEATER SAFETY

of combustible materials, corrosive chemicals or halogenated hydrocarbons* anywhere in the premises.

* Halogenated Hydrocarbons are a family of chemical compounds characterized by the presence of halogen elements (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 outside 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.

2.3 National Standards and Applicable Codes

All appliances must be installed in accordance with the latest revision of the applicable standards and national codes. This refers also to the electric, gas and venting installation. Note: Additional standards for installations in public garages, aircraft hangars, etc. may be applicable.

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

WARNING

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.

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.

Failure to follow these instructions can result in death or injury.

SECTION 3: CRITICAL CONSIDERATIONS

3.1 Basic Information

UHA[X][S] heaters have automatic ignition burners for ON/OFF operation only.

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.

• 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.

3.5 Clearances to Combustibles

Clearances must be as indicated on Page 7, Figure

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.

• Must be installed in a level position with horizontal discharge.

• May be mounted on a shelf of non-combustible material using shelf mounting brackets.( Page 11, Figure 6 and Page 12, Figure 7 for details.)

• May be suspended from above (See Page 11, Figure 5) or from wall brackets of sufficient strength to support the heater as listed in the Dimension Data Table 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.

• Must be installed in a manner which allows access to all serviceable components. See Page 7, Figure 4 for details.

3.4 Minimum Required Installation Clearances

Clearances around the heater and vent must be as indicated through Page 20, Figure 14 to ensure access for servicing, and correct operation.

on Page 7, Figure 4; Page 17, Figure 9

on Page 49, Section 15.1.

See

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

14, Section 6.

on Page

Page 13

SECTION 3: CRITICAL CONSIDERATIONS

WARNING

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.

* Recommended mounting height varies with heater input. Heaters may be mounted at a higher level if destratification fans are installed.

Clearance to Vent: 2" (5 cm)

**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.

3.7 Gas Supply

3.8 Electrical Supply

WARNING

Fire Hazard

Connect gas supply according to Figure 15.

Do not use gas supply pipe and electrical connections to support heater’s weight.

Gas can leak if not installed properly.

Failure to follow these instructions can result in death, injury or property damage.

It is important that the gas supply pipe is sized correctly to provide the inlet pressure as stated on the heater data plate. The gas supply pipe and electrical connections must not support any of the heater's weight.

Figure 4: Installation Clearances and Clearances to Combustibles

See Page 22, Section 8

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.

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.

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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

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.

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.

4.2 Aircraft Hangars

Installation in aircraft hangars must be in accordance with the following codes:

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.

• 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.

• 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 maintenance purposes.

4.3 Parking Structures and Repair Garages

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.

• In accordance with the Standard for Parking Structures NFPA 88A, heaters must be located a minimum of 18" (50 cm) below the floorceiling assembly or 18" (50 cm) above the floor.

• 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.

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.

Canada: Refer to Canadian Electrical Code, CSA C22.1 Part 1 - latest revision.

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.

Canada: Refer to CSA B149.1 Natural Gas and Propane Installation Code.

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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 derated. 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 CSAapproved and must be approved by the local or provincial authority.

SECTION 4: NATIONAL STANDARDS AND APPLICABLE CODES

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

WARNING

Crush Hazard

Use 3/8" threaded rod minimum.

Failure to follow these instructions can result in death, injury or property damage.

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

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 11, Figure 5. For typical shelf mounting on existing shelf, See

Page 11, 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.

Page 17

Figure 5: Suspension Methods

Cone Point

Set Pin

Window

Clamp

Unistrut

3/8" Threaded Rod

Nut

Washer

Riv Nut

Support Points

Ensure all suspension hardware is torqued to a minimum of 20 ft lbs.

Washer

3/8"

Threaded

Rod

Nut

Unistrut

Channel

Nut

Shelf Mounting

Brackets

Description Part Number Qty. Shelf Mounting Bracket Kit 12011000K

Shelf Mounting Bracket 11111510 2 Screw #10 x 1/2" Type AB Phil HWH Z

94311008 2

Existing cabinet screws must be re-used.

SECTION 5: MAJOR COMPONENTS

Figure 6: Shelf-Mounting Methods

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Description Part Number Qty. Wall Shelf Mounting Bracket Kit 12011002K

Wall Suspension Mounting Bracket Kit 12011001K 1 Shelf Mounting Bracket Kit 12011000K 1

Description Part Number Qty. Wall Suspension Mounting Bracket Kit 12011001K

Wall Mounting Bracket Arm Left 111WALL1L 1 Wall Mounting Bracket Arm Right 111WALL1R 1 Wall Mounting Bracket Vertical 111WAL2 2 Wall Mounting Bracket Diagonal 111WAL3 2 5/16" x 3 1/2" Bolt 97213925 6 5/16" Lock Nut with Nylon Insert 92114000 6 5/16" Flat Washer 95211600 6 5/16" Lockwasher 96411600 6

Hardware provided to construct mounting bracket assembly only.

Figure 7: Wall Shelf Mounting and Hanging Suspension

Page 19

Figure 8: Vertical Louvers (Optional)

Description Part Number Qty. Vertical Louver Kit UHA[X][S] 30 & UHA[X][S] 45

12011003K

Vertical Louver Bracket 11111903 2 #10 Screw 94311008 4 UHA[X][S] 30 - 45 Vertical Louvers 11111901 5 Louver Spring 90901200 2 Instruction Sheet 91040036 1

Description Part Number Qty. Vertical Louver Kit UHA[X][S] 60 & UHA[X][S] 75

1201100 5K

Vertical Louver Bracket 11111903 2 #10 Screw 94311008 4 Instruction Sheet 91040036 1

Description Part Number Qty. Vertical Louver Kit UHA[X][S] 100 & UHA[X][S] 125

12011004K

Vertical Louver Bracket 11111903 2 #10 Screw 94311008 4 UHA[X][S] 100 - 125 Vertical Louvers 11111902 5 Instruction Sheet 91040036 1

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

Remove horizontal louvers.

SECTION 5: MAJOR COMPONENTS

Install vertical louvers brackets (top and bottom) with supplied screws.

Push in

louver and compress

spring to remove

(opposite end first)

Install vertical louvers and springs into brackets with springs at top.

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UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 6: VENTING

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.

Failure to follow these instructions can result in death or injury.

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.

sheet metal screws.

For single wall venting, pressure sensitive aluminum tape or silicone sealant must be used to seal all joints.

Aluminum tape shall have a minimum temperature rating of 400° F (204° C) and meet SMACNA AFTS100-73 standards. High temperature silicone sealant must have a minimum temperature rating of 480° F (250° C).

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).

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.

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 Venting

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. Any portion of vent pipe passing through a combustible wall must have a listed thimble to conform with the above codes.

The heater may be installed unvented in certain circumstances according to building ventilation codes. Refer to the above codes Page 15, Section 6.4 for further information. Unvented operation also requires compliance with the clearances to combustibles given Figure 4.

The bottom of the vent or air intake terminal shall not be located less than 1' (.3 m) above grade level.

The vent shall not terminate less than 7' (2.1 m) above grade where located adjacent to public walkways.

Vent terminal must be installed at a height sufficient to prevent blockage by snow and building materials protected from degradation by flue gasses.

Vent terminal must be beyond any combustible overhang.

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

on Page 7,

and

6.2.2 Canadian Requirements

The vent shall not terminate within 6' (1.8 m) of a mechanical air supply inlet to any building.

The vent shall not terminate within 3' (.9 m) of a window or door that can be opened in any building, any non-mechanical air supply inlet to any building, or of the combustion air inlet of any other appliance.

6.3 Vent Installation

Maintain 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. 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. 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 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.

on Page 17, Figure 9 through Page 20,

See Page 7,

Page 21

SECTION 6: VENTING

Vents and air intakes must be adequately supported so that the heater does not bear the weight of the pipes.

For vent termination See Page 17, Figure 9 through Page 20, Figure 14.

6.3.1 Standard Vented Heaters

(Models UHA[X] 30 - 125)

The vent must be fitted with a low resistance terminal. Figure 10. Standard vented heaters do not allow outdoor air intake for combustion air.

6.3.2 Separated Combustion Heaters

(Models UHA[X]S 30 - 125)

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. 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. 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.

Seperated combustion units may not be common vented.

6.4 Unvented Operation

See Page 17, Figure 9 through Page 17,

See Page 19, Figure 12. As an option, the

See Page 19,

See Page 14, Section 6

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.

Failure to follow these instructions can result in death or injury.

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

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

WARNING: Combustion by-products contain a chemical known to the State of California to cause cancer and birth defects or other reproductive harm.

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.

In noncombustible walls only, vent terminal (P/N 02537801-1P) may be used.

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: 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 backup 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 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

• 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 backup may be installed on the next adjacent floor level.

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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.

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”.

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

Model UHA[X][S]

30 - 60

25 ft (7.6 m) 40 ft (12.2 m) 1 20 ft (6.1 m) 35 ft (10.7 m) 2 15 ft (4.6 m) 30 ft (9.1 m) 3 10 ft (3.0 m) 25 ft (7.6 m) 4

5 ft (1.5 m) 20 ft (6.1 m) 5

Model UHA[X][S]

75 - 125

Number of Elbows

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.

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). 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).

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 11.

A vent shall not extend less than 2' (.6m) above the highest point where it passes through a flat roof of a building.

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.

6.9 Replacing an Existing Heater in a Venting System

When replacing an existing heater in a venting system, the venting system may not be properly sized to vent the new heater. The following steps must be followed with each appliance connected to the venting system placed in operation, while any other appliances connected to the venting system are not in operation.

1. Seal any unused openings in the venting system.

2. Inspect the venting system for proper size and horizontal pitch, as required by the NFPA 54/ ANSI Z223.1 - latest revision, National Fuel Gas Code (US) or Standard CSA B149.1 Natural Gas and Propane Installation Code (Canada) and these instructions. Determine that there is no blockage or restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition.

3. Close all building doors and windows and all doors between the space in which the appliance(s) connected to the venting system

Page 23

SECTION 6: VENTING

Model Vent Diameter Part Number

UHA[X] 30 - 125 4" (10 cm) 90502102

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

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).

fireplace dampers.

4. Follow the lighting instructions. Place the

Figure 9: Vent and Roof Detail

appliance being inspected in operation. Adjust thermostat so that the appliance will operate continuously.

5. For any appliance having a draft hood, test for draft hood appliance spillage at the draft hood relief opening after 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

Flashing (By Others)

Listed

Thimble

(2" [5 cm]

Clearance)

4" (10 cm)

Diameter Vent

Vertical

Option

Vent Terminal

Horizontal

Option

Vent

NOTE: Vent supports not shown.

Listed Thimble (2" [5 cm] Clearance)

Flashing (By Others)

Vent Terminal

12" (31 cm) Minimum

Page 24

UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Figure 11: Standard Vented Heater - Common Vertical Vent Termination

Page 25

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

Vent Termination

Listed Thimble

through

Combustible Wall

4" (10 cm)

Diameter Vent

12" (31 cm) Minimum from wall to vent termination.

4" (10 cm) Diameter

Air Intake

12" (31 cm) Minimum from air inlet to vent termination (may be horizontal or vertical clearance).

Air Intake Termination

4" (10 cm) Diameter

Vent

4" (10 cm) Diameter

Air Intake

12" (31 cm)

Minimum from air inlet to vent

termination (may be horizontal

or vertical clearance).

Vertical

Option

Horizontal

Option

12" (31 cm) Minimum from wall to vent termination.

NOTE: Vent supports not shown.

Model Air Intake & Vent Diameter Part Number

UHA[X]S 30 - 125 4" (10 cm) 90502102

4" (10 cm) Single Wall Vent Pipe (By Others)

Seal joint between single wall and Type B vent with silicone sealant.

Use 3 sheetmetal screws equally spaced around joint.

Use 3 sheetmetal screws equally spaced around collar.

Concentric Vent Box

6" (15 cm) Single Wall Inlet Air Pipe (By Others)

One piece of 4" (10 cm) diameter, 1/4" (6 cm) airspace type

“B” vent. Selkirk Model RV or equivalent. (By others)

Combustion Air to Heater

To ward Outside

Exhaust from Heater

SECTION 6: VENTING

Figure 13: Concentric Vent Box

Page 26

UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

6" (16 cm)

Diameter

Single Wall

4" (10 cm) Diameter Air Intake

Concentric Vent Box

Vertical

Option

10' (3 m)

Maximum

Horizontal Option

Concentric Vent Box

Combustion Air Terminal

Vent Terminal with Baffle Plate

Flashing (By Others)

4" (10 cm)

Type B-1

Vent

6" (16 cm)

Minimum

12" (31 cm)

Maximum

Storm Collar (By Others) (Attach with 3 sheet metal screws.)

Combustion Air Terminal

Vent Terminal with Baffle Plate

4"(10

cm)

Type

B-1

Vent

Storm Collar (By Others) (Attach with 3 sheet metal screws.)

4" (10 cm) Diameter Vent

NOTE: Vent supports not shown.

Description Part Number Qty. Concentric Vent Kit UHVK1

Concentric Vent Box Top & Side Assembly 90504113 1 Concentric Vent Box Bottom Assembly 90504112 1 Screw #6 x 3/8 Self Drilling 91119100 14 4" (10 cm) Vent Terminal with Baffle Plate 90502102R 1 6" (16 cm) Combustion Air Terminal 90502103 1

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

Page 27

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.

SECTION 7: AIR SUPPLY

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.

Page 28

UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Do not bend flexible

gas connector

sharply.

• Hold gas nipple securely with pipe wrench when attaching the flexible gas connector.

• Do not twist flexible

gas connector.

• Ensure all

joints are gas tight.

SECTION 8: GAS PIPING

• Gas supply pipe work is run in medium or heavy

WARNING

gauge tubing in compliance with local and national codes.

• Meter and service must be large enough to handle all the burners being installed plus any other connected load. The gas pipe which feeds the system must be large enough to supply the required gas with a maximum pressure drop of

Fire Hazard

Connect gas supply according to Figure 15.

1/2" wc When gas piping is not included in the layout drawing, contact the local gas supplier.

• An isolating valve and union connection should be used and fitted into the supply adjacent to the

Do not use gas supply pipe and electrical connections to support heater’s weight.

Gas can leak if not installed properly.

heater.

• A minimum 1/8" NPT plugged tapping accessible for test connection must be installed immediately upstream of the gas supply

Failure to follow these instructions can result in death, injury or property damage.

connection to the heater.

• For suspended heaters, an approved metal flexible connection between the isolating valve

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.

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

8.1 Connections

Connect the heater to the gas supply ensuring that the final connections are as follows:

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.

Figure 15: Gas Connection

Gas Shut-off Valve

Union

Connection

Option A:

Stainless Steel Flexible Gas Connector

Option B:

Medium or Heavy Gauge Pipe Gas Connector

Drip Leg

Cap

Page 29

SECTION 9: WIRING

WARNING

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.

All heater models require constant 120 V/1Ø/ 60 Hz power supply. Check heater rating plate for electrical rating for proper circuit sizing. For servicing, a disconnect switch of proper electrical rating should be installed in the vicinity of the heater. All heaters are equipped with thermostat connections suitable to power a 24 V thermostat. Heater must be wired and electrically grounded in accordance with local codes. In the absence of local

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.

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.

9.1.1 Fan Control

The heater’s axial fan can be used during the offseason 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

9.2 Low Voltage Thermostat with One Heater

Gas

Supply

Electrical

Supply

Gas

Supply

Terminal

Strip

G W C

Terminal

Strip

R G W C

24 Volt Thermostat Heating Only

24 Volt Thermostat with Fan Control

Electrical

Supply

Page 30

UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Model Relay Type Relay Part Number Max. Number of Heaters

UHA[X][S] 30 - 45 SPST 90417600 4

9.3 Low Voltage Thermostat with Multiple Heaters 30 - 45

Page 31

9.4 Low Voltage Thermostat with Multiple Heaters 60 - 125

Model Relay Type Relay Part Number Max. Number of Heaters

UHA[X][S] 60 - 125 DPST 90436300 4

SECTION 9: WIRING

Page 32

UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Blue

Black

Orange

Yellow

Brown

Black

White

Black

Green

White

Green

Blue

Black

White

Green

Blue

Green

24 VAC

HOT

GROUND

Flame

Black

SENSE

ELECTRODE

LIMIT

SWITCH

PRESSURE

SWITCH

AXIAL FAN

GAS VALVE

IGNITION MODULE

TRANSFORMER

AXIAL FAN (UHA 300, 350, 400) ONLY)

LIMIT SWITCH (UHA 300,350, 400 ONLY)

MANUAL RESET LIMIT SWITCH

(UHA 30 - 125 ONLY)

THERMOSTAT INPUT: FIELD SUPPLIED

R = 24 VAC TO THERMOSTAT (RED) G = MANUAL FAN INPUT FROM THERMOSTAT (GREEN) W = HEAT DEMAND INPUT FROM THERMOSTAT (WHITE) C = COMMON SIDE OF TRANSFORMER

FLUE

BLOWER

R G W C

ACC

CMB Blower

Yellow

Orange

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.

9.5 Internal Wiring Diagram

Page 33

9.6 Ladder Wiring Diagram

IMPORTANT:

SECTION 9: WIRING

120 VAC

FLAME

SENSOR

ELECTRODE

Flame

Spark

AXIAL FAN

FLUE BLOWER

GAS

3 6

IGNITION MODULE

UHA (300, 350, 400 Only)

TRANSFORMER

VALVE

PRESSURE SWITCH

Limit Switch

THERMOSTAT CONNECTION

Limit Switch (UHA 300, 350, 400 Only)

Manual Reset Limit Switch (UHA 30 - 125 Only)

Page 34

UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

BX Connector

Junction Box

Flexible Conduit

Burner

Connect wires together

with suitable approved

wire connectors.

Green to Ground

White to L2

Black to L1

L1 L2

Ground

Black

White

Green

9.7 Electrical Connection to the Heater

IMPORTANT: Junction box is not provided with heater.

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

Page 35

SECTION 10: OPERATION AND 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.

Failure to follow these instructions can result in death, injury or property damage.

SECTION 10: OPERATION AND MAINTENANCE

Read this manual carefully before installation, operation, or service of this equipment. All components are accessed via the door secured by four sheet metal screws. Opening the door exposes live electrical connections and hot components.

10.1 Pre-Start-Up Checks

All pre-start-up checks must be carried out before lighting the heater. Ensure that the heater and all controls are suitable for the gas, pressure and electrical supply to which they are to be connected.

10.1.1 Louvers

WARNING

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.

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.

10.1.4 Mechanical Checks

1. Check that the fan is free to run and delivery louvers are turned to give required air deflection.

2. Check that the flue (and air intake for separated combustion units) is installed in accordance with these instructions and local regulations.

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.

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.

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).

Page 36

UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

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.

Pressure Regulator

Gas Outlet

Outlet Pressure

Description Part Number

Gas Valve 30 - 45 NG 90034500 Gas Valve 30 - 45 LP 90034600

Figure 16: Automatic Burner Control Sequence

Burner Sequence for Ignition Control

START

Thermostat 24 V

RUN

SHUT DOWN

Flue Blower

Pressure

Switch

Ignition Spark

Start Gas Valve

Flame Signal

Axial Fan

*Purge time begins at pressure switch change over.

30 Seconds Purge*

ts = 10 Seconds

30 Seconds Delay 90 Seconds Delay

Required Incoming Signals

Signals Output By Control

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

30 Seconds Post Purge

Page 37

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

½PSI IN

OFF

Regulator

Outlet Pressure

Gas Inlet

Inlet Pressure

TOP VIEW

END VIEW

Description Part Number

Gas Valve 60 - 125 NG 90032505 Gas Valve 60 - 125 LP 90032506

SECTION 10: OPERATION AND MAINTENANCE

10.2.2 Start-Up the Gas Valve (All Gases)

10.2.2.1 Check Burner Gas Pressure

1. Remove the plug in the outlet (burner) pressure test point and connect a pressure tap and a manometer.

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.

IMPORTANT: If the correct burner pressure cannot be reached, then check the inlet pressure to the valve with the burner firing. See Technical Data Ta bl e s

on Page 50, Section 15.3 for inlet pressure

requirement.

Do not continue to adjust the regulator if the pressure is not changing.

If the inlet pressure is too low to allow correct burner

pressure setting, then the gas inlet pressure must be corrected before completing the start-up.

Check Gas Rate

1. After burner pressure adjustment, allow the heater to operate for at least 15 minutes and then re-check settings. Adjust pressure setting if necessary.

2. Check gas flow rate at gas meter.

3. Turn off heater and electrical supply.

4. Remove the manometer and refit all covers to the valve and tighten the screw of the outlet pressure tap.

10.2.3 Pressure Switch

The pressure switch is factory pre-set for each model and is not adjustable.

10.2.4 Turning Off the Heater

Set the thermostat to the "OFF" position or lowest setting and the main burner will stop. 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.

Page 38

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, Figure 4 and the user instructions on Page 6, Section 3 and Page 33, Section 11 and all warnings defined in this manual.

Page 39

SECTION 11: USER INSTRUCTIONS

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.

Failure to follow these instructions can result in death, injury or property damage.

Reset Button

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

SECTION 11: USER INSTRUCTIONS

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 Reset Limit Switch - See Page 33, Section 11.3.1

11.2 Heater Operation

When the heater has been switched on by the thermostat installed on site, the main burner will automatically turn on.

The burner control box will control the safe ignition of the flame.

All heaters require a constant gas and electricity supply which must not be interrupted during the normal operation of this heater.

11.3 Common User Controls

11.3.1 Manual Reset Limit Switch

WARNING

Explosion Hazard

Do not make more than one attempt to restart the heater if manual reset limit switch locks out.

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.

On residentially approved models, the limit thermostat is located inside the access door of the heater. protects against excessive heat build-up inside the burner compartment.

Figure 19: Manual Reset Limit Switch

See Page 44, Section 14.3. This control

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.

Page 40

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 FAU LT MODE

Slow Flash Normal Operation - No call for heat.

Fast Flas h Normal Operation - Call for heat.

2 Flashes Ignition Lockout - No flame detected.

3 Flashes Airflow Fault - Pressure switch open or closed.

4 Flashes Temperature Limit or

Manual Reset Limit Switch Open

5 Flashes Flame Sense Error - Gas valve not energized.

Steady On Internal Control Failure

Page 41

SECTION 12: SERVICING

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.

Failure to follow these instructions can result in death, injury or property damage.

SECTION 12: SERVICING

12.1 Servicing Instructions

After start-up, the heater will require maintenance to be carried out annually. If the heater is used in a dirty or dusty area, more frequent maintenance may be required.

IMPORTANT: After any maintenance or repair work, always test fire the heater in accordance with the start-up instructions Page 32, Section 10.3.1 to ensure all safety systems are in working order before leaving the heater to operate. Minor faults may be traced by using the troubleshooting charts through Page 41, Section 13.5.

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.

IMPORTANT: Inspect all suspended components and hardware. Ensure that they are in good condition, properly tightened, and corrosion free

12.2 Burner Maintenance

1. Open the door and remove the burner compartment cover. See Page 43, Section

14.2.

2. Clean any deposits from the main burner which may have formed in the injectors or venturi of the burner. See Page 43, Section 14.2.

on Page 29, Section 10 through

on Page 38, Section 13

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.

12.3 Fan/Motor Assembly Maintenance

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.

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.

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.

12.5 Gas Valve Maintenance

No regular maintenance is required on this device. To change gas control valves,

14.1 .

Do not repair or disassemble gas valve.

Replace faulty gas valves with replacement parts sold and supplied by Roberts-Gordon.

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

See Page 42, Section

See Page 46,

Page 42

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

WARNING

installations and service of ROBERTS GORDON equipment must be performed by a contractor qualified in the installation and service equipment sold and supplied by Roberts-Gordon and conform to all requirements set forth in the ROBERTS GORDON governmental authorities pertaining to the

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.

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 necessary, using only replacement parts sold and

Turn off gas and electrical supplies before performing service or maintenance.

supplied by Roberts-Gordon.

manuals and all applicable

equipment and perform service where

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.

Page 43

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

Check for gas leaks. See Page 22, Section 8.

Valves Burner Observation

Window

Flue Blower Scroll, Wheel

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

Clean and replace as required.

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 10.

Suspension Points Make sure the heater is hanging securely.

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

See Page 11, Figure 5.

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

burner partition, and blower outlet.

Gas Valve Verify that cap covering pressure regulator adjustment screw is secure and

has not been tampered with.

Verify all wiring connections.

Condensate Drain

Flush drain and clear any obstructions.

(when installed) 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.

Page 44

UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 13: TROUBLESHOOTING

13.1 General

START

Are gas & electrical

supplies on?

Ye s

Is ignition control showing a

"4 flashes" LED code

Ye s

Turn on supplies.

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?

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.

Failure to follow these instructions can result in death, injury or property damage.

Ye s

Fan and limit switch are

operating normally.

Is ignition control showing a

"2 flashes" LED code?

Does the flue

blower run?

Ye s

With external controls (i.e.

thermostat) on, does the

burner continue through the

heating cycle?

Ye s

Heater Operating

TROUBLESHOOT ENDS.

Replace temperature

limit switch.

Burner has locked out due

Ye s

to ignition failure. Use

Troubleshooting for

Automatic Ignition Burner

Systems section to test

burner.

Use Troubleshooting for

Flue Blower section to test

fan.

Has burner “Locked Out”?

Ye s

Use Troubleshooting for

Automatic Ignition Burner

Systems section to test burner.

If problems persist, contact

Roberts-Gordon LLC at

www.rg-inc.com

The limit switch has

tripped. See Manual Reset

Limit Switch Figure.

Ensure proper air flow

clearance for axial fan.

Open louvers slightly.

Replace axial fan if it does

not operate.

Ye s

Replace limit switch.

Page 45

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.

SECTION 13: TROUBLESHOOTING

Page 46

UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

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

Repair or replace as

required.

If problems persist, contact

Roberts-Gordon LLC at

www.rg-inc.com

Replace ignition control.

Use General

Troubleshooting section to

trace the fault.

Heater Operating

TROUBLESHOOT ENDS.

Repair or replace as

required.

Is inlet burner gas pressure

correct? Is live and neutral

polarity correct? Is

flame probe circuit correct?

Is there a current flowing in the flame probe circuit with

no flame present?

Ye s

Does “lockout” occur when

there is a flame present?

Ye s

Is the connecting lead damaged? Is the flame probe damaged or touching earthed

components?

Is the flame present and

at least 1 μA DC flame

current?

Connect a DC ammeter in

series with the flame probe.

Ye s

START

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.

13.3 Troubleshooting for Flame Supervision System

Page 47

13.4 Troubleshooting for Gas Valves

If problems persist, contact

Roberts-Gordon LLC at

www.rg-inc.com

Blower Operating

TROUBLESHOOT ENDS.

Blower motor faulty.

Replace with correct type.

Check blower motor leads

for loose connections.

Correct power

supply problem.

Ye s

START

Does blower turn on and

off while burner is firing

continuously?

Ye s

Does flue blower run

automatically when there

is a call for heat?

Ye s

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.

START

SECTION 13: TROUBLESHOOTING

Is gas pressure at inlet of the

valve correct for gas type?

Note pressure found.

Does gas pressure at outlet

of the valve rise when

valve turns on?

Does gas pressure at

outlet of valve return to zero or

lower when valve turns off?

Valve Operating

TROUBLESHOOT ENDS.

13.5 Troubleshooting for Flue Blower

Ye s

Fault elsewhere.

Correct pressure problem.

Valve or ignition control

faulty. Replace with one of correct type.

Valve faulty.

Replace with one of

correct type.

If problems persist, contact

Roberts-Gordon LLC at

www.rg-inc.com

Page 48

UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

½PSI IN

OFF

Flexible Air Duct

Description Part Number

Gas Valve, NG (Models UHA[X][S] 30 - 45) 90034500 Gas Valve, LP (Models UHA[X][S] 30 - 45) 90034600 Gas Valve, NG (Models UHA[X][S] 60 - 125) 90032505 Gas Valve, LP (Models UHA[X][S] 60 - 125) 90032506

NOTE: Seperated combustion model shown.

SECTION 14: REPLACEMENT PARTS

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.

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.

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.

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 10.2.2.

IT IS IMPORTANT THAT ONLY THE CORRECT GAS VALVE IS USED WHEN REPLACING THESE CONTROLS.

Burner Components

All serviceable burner parts are accessed by the door on the side of the heater. Remove the sheetmetal screws.

Page 49

14.2 Burner Compartment

Remove flexible air duct from spigot

Viewing port for flame probe

Flame Probe

Burner Compartment Cover

Ignition Electrode

Remove screws and pull off burner cover

NOTE: Separated combustion model shown.

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.

Remove manifold

screws and pull

out manifold

Manifold

Inshot

Burners

Orifices

Manifold

Mounting

Bracket

Grommet

Unscrew

Orifices

Manifold

Marking

Folded

Hem

Ensure gas tight fitting of injectors.

Ensure correct

alignment

with burners. Ensure all pipe joints are

gas tight.

14.2.1 Burner Injectors

SECTION 14: REPLACEMENT PARTS

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 2 3 4 5 6 7

Natural Gas (G20)

Orifice Marking 49 49 49 49 46 46

P/N 91930049 91930049 91930049 91930049 91930046 91930046

Propane (G31)

Orifice Marking 56 56 56 1. 15 mm 1. 2 5 mm 1. 25 m m

P/N 91930056 91930056 91930056 91930115 91930125 91930125

Page 50

UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Inshot

Burners

.120

(3 mm)

spark

gap

Ignition

Electrode

Burner Compartment

Front Views

Manual Reset

Limit Switch

(Position may vary.)

Ignition

Electrode

Flame

Probe

Limit

Switch

Flame

Probe

Inshot

Burners

Description Part Number Qty

Spark Electrode 90427411 1 Automatic Ignition Flame Probe 90439300 1 Transformer 90436900K 1 Ignition Module 90434008 1 Inshot Burners UHA[X][S] 30 92000002 2 Inshot Burners UHA[X][S]45 92000002 3 Inshot Burners UHA[X][S] 60 92000002 4 Inshot Burners UHA[X][S] 75 92000002 5 Inshot Burners UHA[X][S] 100 92000002 6 Inshot Burners UHA[X][S] 125 92000002 7 Limit Switch 90412104 1 Manual Reset Limit Switch 90412106 1

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.

14.3 Ignition Electrode and Flame Probe

Page 51

SECTION 14: REPLACEMENT PARTS

Push in

Louver and compress

spring to remove

(opposite end first)

Install Vertical Louver Brackets (top and bottom) with supplied screws.

Install Vertical Louvers and Spring into Brackets with Springs at Top

Horizontal Louvers

Vertical Louvers

Push in

Louver and compress

spring to remove

(opposite end first)

Install Vertical Louver Brackets (top and bottom) with supplied screws.

Install Vertical Louvers and Springs into Brackets with Springs at Top

Horizontal Louvers

Vertical Louvers

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

Description

UHA[X][S]

30 - 45

UHA[X][S]

60 - 75

UHA[X][S]

100 - 125

Horizontal Louvers P/N 11111900 Spring P/N 91901200 Quantity 3 5 7

Description Part Number Qty. Vertical Louver Kit UHA[X][S] 30 & UHA[X][S] 45

1201100 3K

Vertical Louver Bracket - 2 UHA[X][S] 30 - 45 Vertical Louvers - 4 Louver Spring - 5 Instruction Sheet - 2 #10 Screw - 1 #10 Screw - 4

Description Part Number Qty. Vertical Louver Kit UHA[X][S] 60 & UHA[X][S] 75

12011005K

Vertical Louver Bracket - 2 UHA[X][S] 60 - 75 Vertical Louvers - 5 Instruction Sheet - 1 #10 Screw - 4

Description Part Number Qty. Vertical Louver Kit UHA[X][S] 100 & UHA[X][S] 125

12011004K

Vertical Louver Bracket - 2 UHA[X][S] 100 - 125 Vertical Louvers - 5 Instruction Sheet - 1 #10 Screw - 4

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

Page 52

UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Mounting Plate

to Vent Box

fixing screws

Flexible Air

Duct

Intake & Exhaust

Covers

Air Intake Adapter

Gasket

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.

Refit in reverse order. To change the vent and air intake orientation from back to top, remove the blower and mounting plate as above.

Remove intake (if applicable) and exhaust covers from top of the heater.

Rotate the blower, mounting plate and gasket clockwise until the flue adapter lines up with the top hole. Secure screws.

If applicable, remove the flexible air duct from the air intake adapter on the back.

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.

Install intake and exhaust covers over the back holes.

NOTE: Seperated combustion model shown.

14.6 Flue Blower Vertical Installation

Intake & Exha Covers

Mounting Plate

to Vent Box

fixing screws

Air Intake

Adaptor

Mounting Plate

to Flue Blower

screws

Gaskets

Vent Box

ust

MODEL UHA[X][S] 30 -75 UHA[X][S] 100 - 125

Flue Blower P/N 90710404 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 11.

Page 53

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 10.

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

Color Code

Set Point in. wc Pressure Switch Snap Ring P/N

90439801 90439810 90439802 90439810 90439810 90439803

pink black yellow black black gray

.23 .35 .32 .35 .35 .41

90439850 90439850 90439850 90439850 90439850 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 UHA[X][S] 45 UHA[X][S] 60 UHA[X][S] 75 UHA[X][S] 100 UHA[X][S] 125

Axial Fan Guard 91901103 91901103 91901102 91901102 91901102 91901102

Axial Fan Motor 90600104 90600104 90600105 90600105 90600106 90600106

Axial Fan Blade 90709004 90709003 90709002 90709001 90709001 90709001

Page 54

UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

Remove the screws

and washers.

Remove the mounting hardware.

14.9.1 Fan Removal and Replacement

Description Part Number Quantity

Axial Fan UHA[X][S] 30 12011910 1 Axial Fan UHA[X][S] 45 12011911 1 Axial Fan UHA[X][S] 60 12011920 1 Axial Fan UHA[X][S] 75 12011921 1 Axial Fan UHA[X][S] 100 and UHA[X][S] 125

12011922 1

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.

Page 55

SECTION 15: SPECIFICATIONS

20.25"

(51 cm)

25.5"

(65 cm)

1. 8"

(5 cm)

16.63"

28.5"

(72 cm)

3 . 3"

(8 cm)

REAR VIEW

TOP VIEW

Gas Supply

Flue

Air

Intake

(UHA[X]S

only)

SIDE VIEW

Air Intake (UHA[X]S only; Optional Position)

Flue (Optional Position)

4 x 3/8" Captive Nuts Provided

17.63"

(45 cm)

18.25"

(46 cm)

Electrical Supply

Thermostat Connection

(15 cm)

1.5" (4 cm)

6.75" (17 cm)

(15 cm)

6.75" (17 cm)

15.1 Dimension Data

MODEL

SECTION 15: SPECIFICATIONS

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

100

UHA[X][S]

125

'A' Height

'C' Center of Flue [Top Option]

'D' Center of Flue

Recommended Mounting H e i g ht t o H e a te r B a s e ft(m)

(cm)

(30.48)

5.2

(13.21)

2.5

(6.35)

(3.05)

(30.48)

5.2

(13.21)

2.5

(6.35)

(3.05)

17.75

(45.09)

5.2

(13.21)

2.5

(6.35)

(3.66)

17.75

(45.09)

5.2

(13.21)

2.5

(6.35)

(3.66)

(58.42)

6.9

(17.53)

2.5

(6.35)

(6.10)

(58.42)

6.9

(17.53)

2.5

(6.35)

(6.10)

Page 56

UHA LOW PROFILE UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL

15.2 General Technical Data Table (All Models)

Model

Low Profile UHA[X][S] Axial Fans

Full Load Amps @ 115 V A 3.0 3.0 4.1 4.1 5.8 5.8

Air Volume CFM 691 691 1376 1376 1902 1902

Flue and Air Intake

Flue and Air Intake Size in (cm) 4 (10) - All Models

*Maximum Straight Flue/Air Intake ft (m) 25 (7.6) 25 (7.6) 25 (7.6) 25 (12.2) 40 (12.2) 40 (12.2)

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

100

UHA[X][S]

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

15.3 Technical Data Table (All Models)

Model

To t a l I n pu t (Btu/h) x (1000) 30 45 60 75 100 125

To t a l O u t p u t (Btu/h) x (1000) 24.6 36.9 49.2 61.5 82 102.5

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

100

UHA[X][S]

125

Efficiency % 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 3.7 3.5 2.6 3.3

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

Burner Pressure in wc 9.4 9.6 9.6 10.0 9.1 10. 0

Page 57

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

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

ROBERTS GORDON

Service trips, service calls and labor charges. Shipment of replacement parts. Claims where the total price of the goods have not

been paid. Damage due to:

• Improper installation, operation or maintenance.

• Misuse, abuse, neglect, or modification of the ROBERTS GORDON way.

• Use of the ROBERTS GORDON® COMBAT® UHASeries for other than its intended purpose.

• 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® UHASeries in a corrosive atmosphere containing contaminants.

• The use of the ROBERTS GORDON® COMBAT® UHASeries 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.

• Damage incurred during shipment. Claim must be filed with carrier.

WILL NOT PAY FOR:

COMBAT® UHA-Series in any

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 o x 4 4 Buffalo, New York 14240-0044

716.852.4400

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

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.

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.

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

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.

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 RobertsGordon 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.

Some jurisdictions do not allow limitations on

COMBAT® UHA-Series .

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.

Page 58

Page 59

Warm Air Heating

OWNER WARRANTY REGISTRATION CARD

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

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):

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______________

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

Mail or Fax to:

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

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 Roberts-Gordon.

These products are not approved for residential use, except for models UHA[X][S] 30 - UHA[X][S] 75.

© 2008 Roberts-Gordon LLC - All rights reserved. No part of this work covered by the copyrights herein my be reproduced or copied in any form or by any means – g recording, taping, or information storage and retrieval systems – without written permission of Roberts Gordon LLC.

equipment and perform service where necessary, using only replacement parts sold and supplied by

manuals and all applicable governmental authorities pertaining to the

raphic, electronic, or mechanical, including photcopying,

Printed in the U.S.A.

Page 60

Page 61

Page 62

10'

(3 m)

WARNING

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

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.

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.

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

2. Turn off electric power to the heater.

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

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

of gas-fired heating equipment.

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

FOLLOW THESE INSTRUCTIONS TO SHUT DOWN YOUR HEATER

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.

TO TURN OFF THE HEATER

Roberts-Gordon, LLC

1250 William Street P.O. Box 44 Buffalo, NY 14240-0044 USA

Left Right

Bottom

Top

Clearances to Combustibles

Wall

Terminal

Roof Terminal

Max. Mounting Height*

Rear*

Installation Clearances

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 contact us for any further information you may require, including the Installation, Operation and Service Manual.

Models 100-400 are not for residential use.

Telephone: 716.852.4400 Fax: 716.852.0854 Toll Free: 800.828.7450

*Models

Top Rear Max Mounting Height

30 - 125

1" (2.5 cm) 18" (46 cm)

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

150 - 400

6" (15 cm)

24" (61 cm)

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

Heaters 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.

Models

Top Bottom Right Left Vent

30 - 125

1" (2.5 cm)

0" (0 cm)

1" (2.5 cm)

18" (46 cm)*

2" (5 cm)

150 - 400

6" (15 cm)

3" (8 cm)

31" (79 cm)*

6" (15 cm)

2" (5 cm)

* Clearance needed for servicing.

Top

Bottom

Right

Left

Models 30 - 125 Models 150 - 400

(Optional separated

combustion concentric

venting shown.)

Top*

Roberts Gorden UHA-XS60, UHA-XS75, UHA-XS100, UHA-XS30, UHA-XS125 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual