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Gas Heater
Roberts Gorden
UHA[X][S] 30, UHA[X][S] 45, 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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Page 62
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Contents
Combat
Installation, Operation & Service Manual
UHA-Series Tubular Unit Heaters Low Profile Range
Models UHAXS 30, 45, 60, 75, 100,
Page
2008 Roberts-GordonLLC
TABLE OF CONTENTS
Printed in U.S.A
Page
TABLE OF FIGURES
Page
1.1 Manpower Requirements
SECTION 1: HEATER SAFETY
1.2 Safety Labels and Their Placement
For separated combustion units only
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
2.1 Wall Tag
SECTION 2: INSTALLER RESPONSIBILITY
2.2 Corrosive Chemicals
2.3 National Standards and Applicable Codes
3.2 Manufactured Units
3.4 Minimum Required Installation Clearances
3.5 Clearances to Combustibles
3.6 Ventilation
3.8 Electrical Supply
3.7 Gas Supply
3.9 Vent
4.2 Aircraft Hangars
4.1 Gas Codes
4.3 Parking Structures and Repair Garages
4.4 Electrical
4.6 High Altitude
5.2 Shelf Mounting and Suspension
SECTION 5: MAJOR COMPONENTS 5.1 General
5.3 Wall Mounting
Crush Hazard Use 3/8 threaded rod minimum
Figure 6: Shelf-MountingMethods
Figure 5: Suspension Methods
Existing cabinet screws must be re-used
Part Number
Description
Wall Shelf Mounting Bracket Kit
Description
Push in
Figure 8: Vertical Louvers Optional
louver and compress
spring to remove
SECTION 6 VENTING
6.3 Vent Installation
6.1 Changing Vent and Air Intake Orientation
6.2 Venting
6.4 Unvented Operation
6.3.1Standard Vented Heaters Models UHAX 30 -
6.5 Horizontal Venting
6.7 Length Requirements
6.6 Vertical Venting
6.7.1 Maximum Vent Lengths
6.8 Vent Material
Vertical
Figure 9: Vent and Roof Detail
Horizontal
Option
Page
Vertical Option
Figure 13: Concentric Vent Box
Horizontal
Option
Vent Terminal
7.2 Unvented Installation
7.1 Separated Combustion Installation
SECTION 7 AIR SUPPLY
7.3 Building Ventilation
8.1 Connections
SECTION 8: GAS PIPING
Figure 15: Gas Connection
9.1 Positioning Thermostats
SECTION 9: WIRING
9.1.1 Fan Control
9.2 Low Voltage Thermostat with One Heater
Relay Type
Model
Relay Part Number
UHAXS 30 -
DPST
UHAXS 60 -
90436300
Max. Number of Heaters
9.5 Internal Wiring Diagram
9.6 Ladder Wiring Diagram
9.7 Electrical Connection to the Heater
10.1 Pre-Start-UpChecks
SECTION 10: OPERATION AND MAINTENANCE
10.1.1 Louvers
10.1.2 Electrical Checks
Figure 17: Gas Valve for Models UHAXS 30 -
Figure 16: Automatic Burner Control Sequence
Required Incoming Signals
Signals Output By Control
Figure 18: Gas Valve for Models UHAXS 60 -
10.2.3 Pressure Switch
Check Gas Rate
10.2.4 Turning Off the Heater
10.3 Complete Start-Up
10.2.5 External Controls
10.3.1 Instruction to the User
Figure 19: Manual Reset Limit Switch
Reset Limit Switch - See Page 33, Section
SECTION 11: USER INSTRUCTIONS
11.1 User Instructions
11.5.1 Simple Troubleshooting Burner Faults
11.5 Simple Troubleshooting
Figure 20: LED Diagnostic Codes
11.4.2 To Turn the Heater Off
12.3 Fan/Motor Assembly Maintenance
12.2 Burner Maintenance
12.4 Heat Exchanger Maintenance
12.5 Gas Valve Maintenance
12.7 Venting and Air Intake Pipe
12.8 Maintenance Checklist
The Vicinity of the Heater
See Page 6, Section
Combustion Air Intake
when installed
Pipe
Heat Exchanger
START
SECTION 13: TROUBLESHOOTING 13.1 General
SECTION 13: TROUBLESHOOTING
13.3 Troubleshooting for Flame Supervision System
13.5Troubleshooting for Flue Blower
13.4Troubleshooting for Gas Valves
Correct power
START
Burner Components
SECTION 14 REPLACEMENT PARTS
14.1 Gas Valve
14.2.1 Burner Injectors
14.2 Burner Compartment
14.3 Ignition Electrode and Flame Probe
14.5 Louver and Louver Springs
14.4 Heat Exchanger
Install Vertical screws
Horizontal
14.6 Flue Blower Vertical Installation
14.9 Axial Fan/Guard/Motor Assembly
14.7 Pressure Switch
14.8 Ignition Control
14.9.2 To Replace the Fan Assembly
14.9.1 Fan Removal and Replacement
14.10 Limit Switches
14.10.1 Removal and Replacement
TOP VIEW
SECTION 15: SPECIFICATIONS 15.1 Dimension Data
SIDE VIEW
REAR VIEW
15.3 Technical Data Table All Models
15.2 General Technical Data Table All Models
ROBERTS GORDON WILL PAY FOR
WARRANTY IS VOID IF
ROBERTS GORDON WILL NOT PAY FOR
Roberts-Gordon
Page
About the Installer
OWNER WARRANTY REGISTRATION CARD
Purchased From if different than installer
Type of Installation check one
Page
Page
Fire Hazard
Installation Clearances
close to heater
injury or property damage
Top
Page
Image
Contents
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