Models UHAXS 150, 175, 200, 225 250, 300
Installation, Operation & Service Manual
Combat
UHA-Series Tubular Unit Heaters Standard Range
Page
Combat
Gamme standard
Modèles UHAXS 150, 175, 200, 225 250, 300, 350,
Manuel d’installation, d’operation, et de service
Page
Printed in U.S.A
2012 Roberts-GordonLLC
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TABLE OF FIGURES
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1.3 California Proposition
SECTION 1: HEATER SAFETY
1.1 Manpower Requirements
1.2 Safety Labels and Their Placement
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
Product Damage Hazard
SECTION 2: INSTALLER RESPONSIBILITY
2.1 Wall Tag
2.2 Corrosive Chemicals
3.6 Gas Supply
3.4 Minimum Required Installation Clearances
3.2 Manufactured Units
3.5 Ventilation
4.2 Clearances To Combustibles
Fire Hazard
5.4 Electrical
5.1 Gas Codes
5.2 Aircraft Hangars
5.3 Parking Structures and Repair Garages
5.6 High Altitude
Figure 5 Suspension Methods
SECTION 6: HEATER INSTALLATION 6.1 General
6.2 Suspension
Crush Hazard Use 3/8 threaded rod minimum
Carbon Monoxide Hazard
Heaters may be installed vented or unvented
7.2 Vent Installation
SECTION 7: VENTING
7.5 Vertical Venting
7.2.1Standard Vented Heaters Models UHAX 150 -
7.3 Unvented Operation
7.4 Horizontal Venting
Figure 6: Vent and Roof Detail
Maximum Vent Lengths Table
7.7 Vent Material
Part Number
14 of
Vertical Option Bend Horizontal Option
Model
15 of
Requirements
Heaters must be of the same BTU output
16 of
Figure 10: Concentric Vent Box
Horizontal
17 of
Vertical
Option
Explosion Hazard
8.1 Separated Combustion Installation
8.2 Unvented Installation
SECTION 8: AIR SUPPLY
Explosion Hazard
Gas can leak if piping is not installed properly
SECTION 9: GAS PIPING
9.1 Connections
Product Damage Hazard
Do not bend flexible gas connector
Figure 12 Gas Connection
Electrical Shock Hazard
SECTION 10: WIRING
Disconnect electric before service
DANGER
Relay Part Number
22 of
Model
Relay Type
Relay Part Number
23 of
Model
Relay Type
10.5 UHAXS Series Internal Wiring Diagram
10.6 UHAXS Series Ladder Wiring Diagram
26 of
10.7 Electrical Connection to the Heater
Note: Junction box is not provided with heater
during installation
SECTION 11: OPERATION AND MAINTENANCE
heater before service
before service
Figure 13: Automatic Burner Control Sequence
11.2 Begin Start-Up
11.2.1 Before Operating the Heater
on Page 28, Figure
11.2.4 Turning Off the Heater
11.2.3 Pressure Switch
Figure 14: Gas Valve for Models UHAXS 150 -
Check Gas Rate
11.3.1 Instruction to the User
11.2.5 External Controls
11.3 Complete the Start-Up
SECTION 12: USER INSTRUCTIONS
12.3 Simple Troubleshooting
12.3.1 Simple Troubleshooting Burner Fault
Figure 15: LED Diagnostic Codes
13.5 Gas Valve Maintenance
13.2 Burner Maintenance
13.3 Fan/Motor Assembly Maintenance
13.4 Heat Exchanger Maintenance
The Vicinity of the Heater
13.8 Maintenance Checklist
13.7 Venting and Air Intake Pipe
Annual Fall Start-Up
Gas Line and Shut-off
when installed
Heat Exchanger
See Page 19, Section
during installation
SECTION 14: TROUBLESHOOTING
heater before service
before service
36 of
14.1 General
37 of
14.3 Troubleshooting for Flame Supervision System
39 of
14.4 Troubleshooting for Gas Valves
14.5 Troubleshooting for Flue Blower
DANGER
SECTION 15: REPLACEMENT PARTS
Burner Components
15.1 Gas Valve
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
15.8 Ignition Control
15.7 Pressure Switch
15.9 Axial Fan/Guard/Motor Assembly
15.9.2 To Replace the Fan Assembly
15.9.1Fan Removal and Replacement
15.10 Limit Switches
15.10.1 Removal and Replacement
47 of
SECTION 16: SPECIFICATIONS 16.1 Dimension Data
48 of
16.2 General Technical Data Table
16.3 Technical Data Table
U.S.A
WARRANTY IS VOID IF
ROBERTS-GORDONLLC WILL PAY FOR
ROBERTS-GORDONLLC WILL NOT PAY FOR
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Purchased From if different than installer
Mail or Fax to
OWNER WARRANTY REGISTRATION CARD
About the Installer
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![Figure 2: UHA[X][S]200 - 250 Label Placement](/images/new-backgrounds/34902/3490221x1.webp)
