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Gas Heater
Roberts Gorden
UHA[X][S] 45, UHA[X][S] 30, UHA[X][S] 125, UHA[X][S] 100, UHA[X][S] 60, UHA[X][S] 75
Models:
UHA[X][S] 75
UHA[X][S] 60
UHA[X][S] 100
UHA[X][S] 125
UHA[X][S] 30
UHA[X][S] 45
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Troubleshooting
Install
Internal Wiring Diagram
Flame Signal Axial Fan
Wiring
Warranty
Maintenance
Checklist
How to
Replacement Parts
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Image 60
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Page 61
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Contents
Installation, Operation & Service Manual
Combat
UHA-Series Tubular Unit Heaters Low Profile Range
Models UHAXS 30, 45, 60, 75, 100,
Page
TABLE OF CONTENTS
2008 Roberts-GordonLLC
Printed in U.S.A
Page
TABLE OF FIGURES
Page
SECTION 1: HEATER SAFETY
1.1 Manpower Requirements
1.2 Safety Labels and Their Placement
Figure 1: UHA 30 - 45 Label Placement
For separated combustion units only
Figure 2: UHA 60 - 75 Label Placement
For separated combustion units only
Figure 3: UHA 100 - 125 Label Placement
For separated combustion units only
SECTION 2: INSTALLER RESPONSIBILITY
2.1 Wall Tag
2.2 Corrosive Chemicals
2.3 National Standards and Applicable Codes
3.4 Minimum Required Installation Clearances
3.2 Manufactured Units
3.5 Clearances to Combustibles
3.6 Ventilation
3.7 Gas Supply
3.8 Electrical Supply
3.9 Vent
4.1 Gas Codes
4.2 Aircraft Hangars
4.3 Parking Structures and Repair Garages
4.4 Electrical
4.6 High Altitude
SECTION 5: MAJOR COMPONENTS 5.1 General
5.2 Shelf Mounting and Suspension
5.3 Wall Mounting
Crush Hazard Use 3/8 threaded rod minimum
Figure 5: Suspension Methods
Figure 6: Shelf-MountingMethods
Existing cabinet screws must be re-used
Description
Part Number
Wall Shelf Mounting Bracket Kit
Description
Figure 8: Vertical Louvers Optional
Push in
louver and compress
spring to remove
6.3 Vent Installation
SECTION 6 VENTING
6.1 Changing Vent and Air Intake Orientation
6.2 Venting
6.3.1Standard Vented Heaters Models UHAX 30 -
6.4 Unvented Operation
6.5 Horizontal Venting
6.6 Vertical Venting
6.7 Length Requirements
6.7.1 Maximum Vent Lengths
6.8 Vent Material
Figure 9: Vent and Roof Detail
Vertical
Horizontal
Option
Page
Figure 13: Concentric Vent Box
Vertical Option
Horizontal
Option
Vent Terminal
7.1 Separated Combustion Installation
7.2 Unvented Installation
SECTION 7 AIR SUPPLY
7.3 Building Ventilation
SECTION 8: GAS PIPING
8.1 Connections
Figure 15: Gas Connection
SECTION 9: WIRING
9.1 Positioning Thermostats
9.1.1 Fan Control
9.2 Low Voltage Thermostat with One Heater
Model
Relay Type
Relay Part Number
UHAXS 30 -
UHAXS 60 -
DPST
90436300
Max. Number of Heaters
9.5 Internal Wiring Diagram
9.6 Ladder Wiring Diagram
9.7 Electrical Connection to the Heater
SECTION 10: OPERATION AND MAINTENANCE
10.1 Pre-Start-UpChecks
10.1.1 Louvers
10.1.2 Electrical Checks
Figure 16: Automatic Burner Control Sequence
Figure 17: Gas Valve for Models UHAXS 30 -
Required Incoming Signals
Signals Output By Control
10.2.3 Pressure Switch
Figure 18: Gas Valve for Models UHAXS 60 -
Check Gas Rate
10.2.4 Turning Off the Heater
10.2.5 External Controls
10.3 Complete Start-Up
10.3.1 Instruction to the User
Reset Limit Switch - See Page 33, Section
Figure 19: Manual Reset Limit Switch
SECTION 11: USER INSTRUCTIONS
11.1 User Instructions
11.5 Simple Troubleshooting
11.5.1 Simple Troubleshooting Burner Faults
Figure 20: LED Diagnostic Codes
11.4.2 To Turn the Heater Off
12.2 Burner Maintenance
12.3 Fan/Motor Assembly Maintenance
12.4 Heat Exchanger Maintenance
12.5 Gas Valve Maintenance
12.8 Maintenance Checklist
12.7 Venting and Air Intake Pipe
The Vicinity of the Heater
See Page 6, Section
when installed
Combustion Air Intake
Pipe
Heat Exchanger
SECTION 13: TROUBLESHOOTING 13.1 General
START
SECTION 13: TROUBLESHOOTING
13.3 Troubleshooting for Flame Supervision System
13.4Troubleshooting for Gas Valves
13.5Troubleshooting for Flue Blower
Correct power
START
SECTION 14 REPLACEMENT PARTS
Burner Components
14.1 Gas Valve
14.2 Burner Compartment
14.2.1 Burner Injectors
14.3 Ignition Electrode and Flame Probe
14.4 Heat Exchanger
14.5 Louver and Louver Springs
Install Vertical screws
Horizontal
14.6 Flue Blower Vertical Installation
14.7 Pressure Switch
14.9 Axial Fan/Guard/Motor Assembly
14.8 Ignition Control
14.9.1 Fan Removal and Replacement
14.9.2 To Replace the Fan Assembly
14.10 Limit Switches
14.10.1 Removal and Replacement
SECTION 15: SPECIFICATIONS 15.1 Dimension Data
TOP VIEW
SIDE VIEW
REAR VIEW
15.2 General Technical Data Table All Models
15.3 Technical Data Table All Models
WARRANTY IS VOID IF
ROBERTS GORDON WILL PAY FOR
ROBERTS GORDON WILL NOT PAY FOR
Roberts-Gordon
Page
OWNER WARRANTY REGISTRATION CARD
About the Installer
Purchased From if different than installer
Type of Installation check one
Page
Page
Installation Clearances
Fire Hazard
close to heater
injury or property damage
Top
Page
Image
Contents
![Roberts Gorden UHA[X][S] 45, UHA[X][S] 30, UHA[X][S] 125, UHA[X][S] 100, UHA[X][S] 60, UHA[X][S] 75 service manual](/prints/roberts-gorden-uhaxs-45-uhaxs-30-uhaxs-125-uhaxs-100/34852/60.1080/uhaxs-45.1080.webp)