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Roberts Gorden
UHD[X][S][R] 75, UHD[X][S][R] 125 service manual
Models:
UHD[X][S][R] 125
UHD[X][S][R] 75
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Troubleshooting
Specification
Install
Internal Wiring Diagram
Replacement Parts
Warranty
Maintenance
Wiring
Reset Limit Switch - See Page 26, Section
Required Incoming Signals
Page 48
Image 48
UHD L
OW
P
ROFILE
D
UCT
F
URNACE
I
NSTALLATION
O
PERATION AND
S
ERVICE
M
ANUAL
42
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Page 48
Image 48
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Contents
Combat
UHD-Series Tubular Duct Furnace Low Profile Range
Models UHDXSR 75
Quality in Any Language
Page
2008 Roberts-GordonLLC
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
3.4 Minimum Required Installation Clearances
3.2 Manufactured Units
3.5 Clearances to Combustibles
Figure 1 Clearances to Combustibles
Heaters may be installed vented or unvented
Gas can leak if not installed properly
3.6 Ventilation
Carbon Monoxide Hazard
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
5.1.3 Air Flow and Temperature Rise Ranges
5.1.1 Minimum Inlet Duct Length
5.2 Shelf Mounting and Suspension
Crush Hazard Use 3/8 threaded rod minimum
Figure 3 Suspension Methods
5.3 Wall Mounting
Figure 4 Shelf-MountingMethods
Figure 5 Wall Shelf Mounting and Suspension
Existing cabinet screws must be re-used
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
6.4 Unvented Operation
6.5 Horizontal Venting
6.6 Vertical Venting
6.7.1 Maximum Vent Lengths
6.8 Vent Material
Figure 6 Vent and Roof Detail
Model
UHDXR
90502102
Page
Figure 10 Concentric Vent Box
Description
Part Number
Concentric Vent Kit
UHVK1
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 12 Gas Connection
Gas can leak if not installed properly
SECTION 9 WIRING
9.2 Low Voltage Thermostat with One Heater
9.1 Positioning Thermostats
Electrical Shock Hazard
9.3 Internal Wiring Diagram
9.4 Ladder Wiring Diagram
9.5 Electrical Connection to the Heater
SECTION 10 OPERATION AND MAINTENANCE
10.2 Begin Start-Up
10.2.1 Before Operating the Heater
10.1 Pre-Start-UpChecks
Figure 13 Automatic Burner Control Sequence
Figure 14 Gas Valve
END VIEW
Required Incoming Signals
10.2.3 Pressure Switch
Check Gas Rate
10.2.4 Turning Off the Heater
10.2.5 External Controls
Reset Limit Switch - See Page 26, Section
The fault must be traced and repaired
Figure 15 Manual Reset Limit Switch
SECTION 11 USER INSTRUCTIONS
11.5 Simple Troubleshooting
11.5.1 Simple Troubleshooting Burner Faults
Figure 16 LED Diagnostic Codes
11.4.2 To Turn Heater Off
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 13.1 General
START
TROUBLESHOOT ENDS. No
13.3 Troubleshooting for Flame Supervision System
13.4 Troubleshooting for Gas Valves
13.5 Troubleshooting for Flue Blower
START
START
SECTION 14 REPLACEMENT PARTS
Burner Components
14.1 Gas Valve
14.2 Burner Compartment
14.2.1 Burner Injectors
Ensure gas tight fitting of injectors
Ensure correct alignment with burners
14.3 Ignition Electrode and Flame Probe
14.4 Heat Exchanger
14.5 Flue Blower Vertical Installation
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
Model
15.2 General Technical Data Table
15.3 Technical Data Table
Page
WARRANTY IS VOID IF
ROBERTS GORDON WILL PAY FOR
ROBERTS GORDON WILL NOT PAY FOR
Roberts-Gordon
Page
Mail or Fax to
OWNER WARRANTY REGISTRATION CARD
About the Installer
Purchased From if different than installer
Page
Page
Fire Hazard