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Roberts Gorden
UHD[X][S][R] 125, UHD[X][S][R] 75 service manual
Models:
UHD[X][S][R] 125
UHD[X][S][R] 75
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Troubleshooting
Specifications
Install
Internal Wiring Diagram
Replacement Parts
Warranty
Maintenance
Wiring
Reset Limit Switch - See Page 26, Section
Required Incoming Signals
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Contents
UHD-Series Tubular Duct Furnace Low Profile Range
Combat
Models UHDXSR 75
Quality in Any Language
Page
2008 Roberts-GordonLLC
Page
TABLE OF FIGURES
Page
1.1 Manpower Requirements
SECTION 1 HEATER SAFETY
2.2 Corrosive Chemicals
SECTION 2 INSTALLER RESPONSIBILITY
2.3 National Standards and Applicable Codes
2.1 Wall Tag
3.2 Manufactured Units
3.4 Minimum Required Installation Clearances
3.5 Clearances to Combustibles
Figure 1 Clearances to Combustibles
Gas can leak if not installed properly
Heaters may be installed vented or unvented
3.6 Ventilation
Carbon Monoxide Hazard
4.2 Aircraft Hangars
4.1 Gas Codes
4.3 Parking Structures and Repair Garages
4.4 Electrical
4.6 High Altitude
5.1.2 Temperature Rise and Pressure Drop Ranges
SECTION 5 DUCT HEATER INSTALLATION 5.1 General
5.1.3 Air Flow and Temperature Rise Ranges
5.1.1 Minimum Inlet Duct Length
Crush Hazard Use 3/8 threaded rod minimum
5.2 Shelf Mounting and Suspension
Figure 3 Suspension Methods
5.3 Wall Mounting
Existing cabinet screws must be re-used
Figure 4 Shelf-MountingMethods
Figure 5 Wall Shelf Mounting and Suspension
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 UHDXR
6.5 Horizontal Venting
6.6 Vertical Venting
6.8 Vent Material
6.7.1 Maximum Vent Lengths
Model
Figure 6 Vent and Roof Detail
UHDXR
90502102
Page
Figure 10 Concentric Vent Box
Part Number
Description
Concentric Vent Kit
UHVK1
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 12 Gas Connection
Gas can leak if not installed properly
9.2 Low Voltage Thermostat with One Heater
SECTION 9 WIRING
9.1 Positioning Thermostats
Electrical Shock Hazard
9.3 Internal Wiring Diagram
9.4 Ladder Wiring Diagram
9.5 Electrical Connection to the Heater
10.2 Begin Start-Up
SECTION 10 OPERATION AND MAINTENANCE
10.2.1 Before Operating the Heater
10.1 Pre-Start-UpChecks
Figure 14 Gas Valve
Figure 13 Automatic Burner Control Sequence
END VIEW
Required Incoming Signals
Check Gas Rate
10.2.3 Pressure Switch
10.2.4 Turning Off the Heater
10.2.5 External Controls
The fault must be traced and repaired
Reset Limit Switch - See Page 26, Section
Figure 15 Manual Reset Limit Switch
SECTION 11 USER INSTRUCTIONS
11.5.1 Simple Troubleshooting Burner Faults
11.5 Simple Troubleshooting
Figure 16 LED Diagnostic Codes
11.4.2 To Turn Heater Off
12.3 Heat Exchanger Maintenance
12.2 Burner Maintenance
12.4 Gas Valve Maintenance
SECTION 12 SERVICING
The Vicinity of the Heater
12.7 Maintenance Checklist
See Page 3, Section
Vehicles and Other
Gas Line and Shut-off
when installed
Valves
Burner Observation
START
SECTION 13 TROUBLESHOOTING 13.1 General
TROUBLESHOOT ENDS. No
13.3 Troubleshooting for Flame Supervision System
13.5 Troubleshooting for Flue Blower
13.4 Troubleshooting for Gas Valves
START
START
14.1 Gas Valve
SECTION 14 REPLACEMENT PARTS
Burner Components
14.2.1 Burner Injectors
14.2 Burner Compartment
Ensure gas tight fitting of injectors
Ensure correct alignment with burners
14.4 Heat Exchanger
14.3 Ignition Electrode and Flame Probe
14.5 Flue Blower Vertical Installation
14.8 Limit Switches
14.6 Pressure Switch
14.8.1 Removal and Replacement
14.7 Ignition Control
Model
SECTION 15 SPECIFICATIONS 15.1 Dimension Data
15.3 Technical Data Table
15.2 General Technical Data Table
Page
ROBERTS GORDON WILL PAY FOR
WARRANTY IS VOID IF
ROBERTS GORDON WILL NOT PAY FOR
Roberts-Gordon
Page
OWNER WARRANTY REGISTRATION CARD
Mail or Fax to
About the Installer
Purchased From if different than installer
Page
Page
Fire Hazard