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Furnace
Roberts Gorden
UHD[X][S][R] 400, UHD[X][S][R] 300, UHD[X][S][R] 250, 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
Specifications
Install
Internal Wiring Diagram
Replacement Parts
Warranty
Maintenance
Wiring
Temperature Rise and Pressure Drop Ranges
Safety
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Contents
UHD-Series Tubular Duct Furnace Standard Range
Installation, Operation & Service Manual
Combat
Models UHDXSR 150, 175, 200, 225 250, 300, 350,
Page
Printed in U.S.A
TABLE OF CONTENTS
2008 Roberts-GordonLLC
Page
TABLE OF FIGURES
Page
SECTION 1: HEATER SAFETY
1.1 Manpower Requirements
2.3 National Standards and Applicable Codes
SECTION 2 INSTALLER RESPONSIBILITY
2.2 Corrosive Chemicals
2.1 Wall Tag
3.4 Minimum Required Installation Clearances
• Must be installed in a manner which allows
access to all serviceable components
3.2 Manufactured Units
3.8 Electrical Supply
3.6 Ventilation
3.7 Gas Supply
3.9 Vent
4.3 Parking Structures and Repair Garages
4.1 Gas Codes
4.2 Aircraft Hangars
4.4 Electrical
4.6 High Altitude
5.1.1 Minimum Inlet Duct Length
SECTION 5 DUCT HEATER INSTALLATION 5.1 General
5.1.2 Temperature Rise and Pressure Drop Ranges
Figure 2 Air Flow Direction
Figure 3: Suspension Methods
5.1.3 Air Flow And Temperature Rise Ranges
5.2 Suspension
Crush Hazard Use 3/8 threaded rod minimum
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 UHDXR 150 -
6.4 Unvented Operation
6.6 Vertical Venting
Figure 4: Vent and Roof Detail
6.7.1 Maximum Vent Lengths
6.8 Vent Material
90502102
Model
UHDXR 150 -
Vent Diameter
Horizontal Option
Figure 8 Concentric Vent Box
Vertical Option
Description
SECTION 7: AIR SUPPLY
7.1 Separated Combustion Installation
7.2 Unvented Installation
7.3 Building Ventilation
Figure 10 Gas Connection
SECTION 8 GAS PIPING
8.1 Connections
9.2 Low Voltage Thermostat with One Heater
SECTION 9 WIRING
9.1 Positioning Thermostats
9.3 Internal Wiring Diagram
FLAME SENSOR ELECTRODE
9.4 Ladder Wiring Diagram
120 VAC FLUE BLOWER TRANSFORMER GAS VALVE
9.5 Electrical Connection to the Heater
10.1.1 Electrical Checks
SECTION 10: OPERATION AND MAINTENANCE
10.1 Pre-Start-UpChecks
10.1.2 Gas Supply
END VIEW
Figure 11: Automatic Burner Control Sequence
Figure 12: Gas Valve
TOP VIEW
10.2.4 Turning Off the Heater
10.2.3 Pressure Switch
Check Gas Rate
10.2.5 External Controls
Figure 13 LED Diagnostic Codes
11.4 Simple Troubleshooting
11.4.1 Simple Troubleshooting Burner Faults
SECTION 11 USER INSTRUCTIONS
12.4 Gas Valve Maintenance
12.2 Burner Maintenance
12.3 Heat Exchanger Maintenance
SECTION 12: SERVICING
See Page 3, Section
12.7 Maintenance Checklist
The Vicinity of the Heater
Vehicles and Other
Valves
when installed
Gas Line and Shut-off
Burner Observation
SECTION 13 TROUBLESHOOTING 13.1General
START
TROUBLESHOOT ENDS. No
13.3 Troubleshooting for Flame Supervision System
START
13.4Troubleshooting for Gas Valves
13.5 Troubleshooting for Flue Blower
START
14.1 Gas Valve
SECTION 14: REPLACEMENT PARTS
Burner Components
Remove the gas supply pipe at the heater inlet
NOTE: Separated combustion
14.2 Burner Compartment
14.2.1 Burner Injectors
Ensure gas tight fitting of injectors
14.3 Ignition Electrode and Flame Probe
14.4 Heat Exchanger
14.5 Flue Blower
14.8.1 Removal and Replacement
14.6 Pressure Switch
14.8 Limit Switches
14.7 Ignition Control
SECTION 15 SPECIFICATIONS 15.1 Dimension Data
15.2 General Technical Data Table
15.3 Technical Data Table
ROBERTS GORDON WILL NOT PAY FOR
WARRANTY IS VOID IF
ROBERTS GORDON WILL PAY FOR
U.S.A
Page
Purchased From if different than installer
OWNER WARRANTY REGISTRATION CARD
About the Installer
Type of Installation check one
Page
Page
Fire Hazard