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