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Furnace
Roberts Gorden
UHD[X][S][R] 300, UHD[X][S][R] 250, UHD[X][S][R] 400, UHD[X][S][R] 350 service manual
Models:
UHD[X][S][R] 175
UHD[X][S][R] 150
UHD[X][S][R] 200
UHD[X][S][R] 225
UHD[X][S][R] 350
UHD[X][S][R] 400
UHD[X][S][R] 250
UHD[X][S][R] 300
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Troubleshooting
Specification
Install
Internal Wiring Diagram
Replacement Parts
Warranty
Maintenance
Wiring
Temperature Rise and Pressure Drop Ranges
Safety
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Page 49
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Contents
Installation, Operation & Service Manual
Combat
UHD-Series Tubular Duct Furnace Standard Range
Models UHDXSR 150, 175, 200, 225 250, 300, 350,
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
SECTION 2 INSTALLER RESPONSIBILITY
2.2 Corrosive Chemicals
2.3 National Standards and Applicable Codes
2.1 Wall Tag
• Must be installed in a manner which allows
access to all serviceable components
3.4 Minimum Required Installation Clearances
3.2 Manufactured Units
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 DUCT HEATER INSTALLATION 5.1 General
5.1.2 Temperature Rise and Pressure Drop Ranges
5.1.1 Minimum Inlet Duct Length
Figure 2 Air Flow Direction
5.1.3 Air Flow And Temperature Rise Ranges
5.2 Suspension
Figure 3: Suspension Methods
Crush Hazard Use 3/8 threaded rod minimum
6.3 Vent Installation
SECTION 6: VENTING
6.1 Changing Vent and Air Intake Orientation
6.2 Venting
6.3.1Standard Vented Heaters Models UHDXR 150 -
6.4 Unvented Operation
6.5 Horizontal Venting
6.6 Vertical Venting
6.7.1 Maximum Vent Lengths
6.8 Vent Material
Figure 4: Vent and Roof Detail
Model
UHDXR 150 -
90502102
Vent Diameter
Figure 8 Concentric Vent Box
Vertical Option
Horizontal Option
Description
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 10 Gas Connection
SECTION 9 WIRING
9.1 Positioning Thermostats
9.2 Low Voltage Thermostat with One Heater
9.3 Internal Wiring Diagram
9.4 Ladder Wiring Diagram
120 VAC FLUE BLOWER TRANSFORMER GAS VALVE
FLAME SENSOR ELECTRODE
9.5 Electrical Connection to the Heater
SECTION 10: OPERATION AND MAINTENANCE
10.1 Pre-Start-UpChecks
10.1.1 Electrical Checks
10.1.2 Gas Supply
Figure 11: Automatic Burner Control Sequence
Figure 12: Gas Valve
END VIEW
TOP VIEW
10.2.3 Pressure Switch
Check Gas Rate
10.2.4 Turning Off the Heater
10.2.5 External Controls
11.4 Simple Troubleshooting
11.4.1 Simple Troubleshooting Burner Faults
Figure 13 LED Diagnostic Codes
SECTION 11 USER INSTRUCTIONS
12.2 Burner Maintenance
12.3 Heat Exchanger Maintenance
12.4 Gas Valve Maintenance
SECTION 12: SERVICING
12.7 Maintenance Checklist
The Vicinity of the Heater
See Page 3, Section
Vehicles and Other
when installed
Gas Line and Shut-off
Valves
Burner Observation
SECTION 13 TROUBLESHOOTING 13.1General
START
TROUBLESHOOT ENDS. No
13.3 Troubleshooting for Flame Supervision System
13.4Troubleshooting for Gas Valves
13.5 Troubleshooting for Flue Blower
START
START
SECTION 14: REPLACEMENT PARTS
Burner Components
14.1 Gas Valve
Remove the gas supply pipe at the heater inlet
14.2 Burner Compartment
14.2.1 Burner Injectors
NOTE: Separated combustion
Ensure gas tight fitting of injectors
14.3 Ignition Electrode and Flame Probe
14.4 Heat Exchanger
14.5 Flue Blower
14.6 Pressure Switch
14.8 Limit Switches
14.8.1 Removal and Replacement
14.7 Ignition Control
SECTION 15 SPECIFICATIONS 15.1 Dimension Data
15.2 General Technical Data Table
15.3 Technical Data Table
WARRANTY IS VOID IF
ROBERTS GORDON WILL PAY FOR
ROBERTS GORDON WILL NOT PAY FOR
U.S.A
Page
OWNER WARRANTY REGISTRATION CARD
About the Installer
Purchased From if different than installer
Type of Installation check one
Page
Page
Fire Hazard
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