Combat
Installation, Operation & Service Manual
UHA-Series Tubular Unit Heaters Standard Range
Models UHAXS 150, 175, 200, 225 250, 300
Page
Modèles UHAXS 150, 175, 200, 225 250, 300, 350,
Gamme standard
Manuel d’installation, d’operation, et de service
Combat
Page
Printed in U.S.A
2012 Roberts-GordonLLC
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TABLE OF FIGURES
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1.1 Manpower Requirements
SECTION 1: HEATER SAFETY
1.2 Safety Labels and Their Placement
1.3 California Proposition
For separated combustion units only 2 of
Figure 1: UHAXS150 - 175 Label Placement
For separated combustion units only 3 of
Figure 2: UHAXS200 - 250 Label Placement
For separated combustion units only 4 of
Figure 3: UHAXS300 - 400 Label Placement
2.1 Wall Tag
SECTION 2: INSTALLER RESPONSIBILITY
2.2 Corrosive Chemicals
Product Damage Hazard
3.2 Manufactured Units
3.4 Minimum Required Installation Clearances
3.5 Ventilation
3.6 Gas Supply
4.2 Clearances To Combustibles
Fire Hazard
5.2 Aircraft Hangars
5.1 Gas Codes
5.3 Parking Structures and Repair Garages
5.4 Electrical
5.6 High Altitude
6.2 Suspension
SECTION 6: HEATER INSTALLATION 6.1 General
Crush Hazard Use 3/8 threaded rod minimum
Figure 5 Suspension Methods
7.2 Vent Installation
Heaters may be installed vented or unvented
SECTION 7: VENTING
Carbon Monoxide Hazard
7.3 Unvented Operation
7.2.1Standard Vented Heaters Models UHAX 150 -
7.4 Horizontal Venting
7.5 Vertical Venting
Maximum Vent Lengths Table
7.7 Vent Material
Figure 6: Vent and Roof Detail
Vertical Option Bend Horizontal Option
14 of
Model
Part Number
Requirements
Heaters must be of the same BTU output
15 of
16 of
Figure 10: Concentric Vent Box
Vertical
17 of
Option
Horizontal
8.2 Unvented Installation
8.1 Separated Combustion Installation
SECTION 8: AIR SUPPLY
Explosion Hazard
SECTION 9: GAS PIPING
Gas can leak if piping is not installed properly
9.1 Connections
Explosion Hazard
Do not bend flexible gas connector
Figure 12 Gas Connection
Product Damage Hazard
Disconnect electric before service
SECTION 10: WIRING
DANGER
Electrical Shock Hazard
Model
22 of
Relay Type
Relay Part Number
Model
23 of
Relay Type
Relay Part Number
10.5 UHAXS Series Internal Wiring Diagram
10.6 UHAXS Series Ladder Wiring Diagram
10.7 Electrical Connection to the Heater
Note: Junction box is not provided with heater
26 of
heater before service
SECTION 11: OPERATION AND MAINTENANCE
before service
during installation
11.2.1 Before Operating the Heater
11.2 Begin Start-Up
on Page 28, Figure
Figure 13: Automatic Burner Control Sequence
Figure 14: Gas Valve for Models UHAXS 150 -
11.2.3 Pressure Switch
Check Gas Rate
11.2.4 Turning Off the Heater
11.2.5 External Controls
11.3 Complete the Start-Up
11.3.1 Instruction to the User
12.3.1 Simple Troubleshooting Burner Fault
12.3 Simple Troubleshooting
Figure 15: LED Diagnostic Codes
SECTION 12: USER INSTRUCTIONS
13.3 Fan/Motor Assembly Maintenance
13.2 Burner Maintenance
13.4 Heat Exchanger Maintenance
13.5 Gas Valve Maintenance
13.7 Venting and Air Intake Pipe
13.8 Maintenance Checklist
Annual Fall Start-Up
The Vicinity of the Heater
Heat Exchanger
when installed
See Page 19, Section
Gas Line and Shut-off
heater before service
SECTION 14: TROUBLESHOOTING
before service
during installation
36 of
14.1 General
37 of
14.3 Troubleshooting for Flame Supervision System
14.4 Troubleshooting for Gas Valves
14.5 Troubleshooting for Flue Blower
39 of
Burner Components
SECTION 15: REPLACEMENT PARTS
15.1 Gas Valve
DANGER
15.2.1 Burner Injectors
15.2 Burner Compartment
15.3 Ignition Electrode and Flame Probe
15.5 Louvers and Louver Spring
15.4 Heat Exchanger
15.6 Flue Blower
15.7 Pressure Switch
15.9 Axial Fan/Guard/Motor Assembly
15.8 Ignition Control
15.10 Limit Switches
15.9.1Fan Removal and Replacement
15.10.1 Removal and Replacement
15.9.2 To Replace the Fan Assembly
47 of
SECTION 16: SPECIFICATIONS 16.1 Dimension Data
16.2 General Technical Data Table
16.3 Technical Data Table
48 of
ROBERTS-GORDONLLC WILL PAY FOR
WARRANTY IS VOID IF
ROBERTS-GORDONLLC WILL NOT PAY FOR
U.S.A
Page
OWNER WARRANTY REGISTRATION CARD
Mail or Fax to
About the Installer
Purchased From if different than installer
Page
![10.6 UHA[X][S] Series Ladder Wiring Diagram](/images/new-backgrounds/34902/3490265x1.webp)
