Install Instructions
Table Of Contents
- UNIT HEATER INSTALLATION/OPERATION/MAINTENANCE: (MODEL UBX: STANDARD POWER VENT BLOWER TYPE, MODEL UBZ: SEPARATED-COMBUSTION BLOWER TYPE, MODEL UDX: STANDARD POWER VENT FAN TYPE, MODEL UDZ: SEPARATED-COMBUSTION FAN TYPE)
- TABLE OF CONTENTS
- GENERAL INFORMATION
- INSTALLATION
- CONTROLS
- OPERATION
- ADJUSTMENTS
- MAINTENANCE
- Service Checklist
- Maintenance Procedures
- Burner Maintenance
- Burner Orifice Maintenance
- Heat Exchanger Maintenance
- Ignition System Maintenance
- Maintenance of Fan Motor, Fan Blades, and Fan Guard
- Venter Motor and Wheel Assembly Maintenance
- Operating Gas Valve Maintenance
- Pressure Switch Maintenance
- High Temperature Limit Control Maintenance
- Flame Rollout Switch Maintenance (Model UDZ Unit Sizes 030–125 Only)
- Interlock Door Switch Maintenance (Models UBZ and UDZ Only)
- Transformer Maintenance
- Disconnect Switch Replacement (Models UBZ and UDZ Only)
- Vent or Vent/Combustion Air System Maintenance
- TROUBLESHOOTING
- INSTALLATION RECORD (TO BE COMPLETED BY INSTALLER)
- FIGURES
- Figure 1. Heater Throw Patterns (Refer to Table 2 and Table 3)
- Figure 2. Dimensions—Models UBX and UBZ (Refer to Table 4)
- Figure 3. Dimensions—Models UDX and UDZ (Refer to Table 5)
- Figure 4. Confined Space Combustion Air Openings (Refer to Table 8)
- Figure 5. Plugging Unused Suspension Points (Models UBZ and UDZ Only)
- Figure 6. Option CK8 or CK10 Hanger Kit
- Figure 7. Option CK22 Hanger Kit
- Figure 8. Heater Suspension Using Field-Supplied Threaded Rods
- Figure 9. Gas Connections
- Figure 10. Supply Wiring Entrance and Control Connection Terminal Strip
- Figure 11. Circuit Board (DSI Control Module)
- Figure 12. Component Locations (Typical)
- Figure 13. Gas Valve ON/OFF Control
- Figure 14. Pressure Switch
- Figure 15. Gas Valves
- Figure 16. Typical Burner Assembly
- Figure 17. Ignitor Spark Gap
- Figure 18. Fan Blade Positioning and Spacing
- Figure 19. Venter Motor and Wheel Assembly
- Figure 20. Replaceable Components
- Figure 21. DSI Control Module Troubleshooting Flowchart
- TABLES
- Table 1. Related Technical Manuals Available from Factory Distributor
- Table 2. Heater Throw Distances with Standard Horizontal Louvers at Mounting Heights of 5 to 18 Feet
- Table 3. Heater Throw Distances with Standard Horizontal Louvers at Mounting Heights of 1.5 to 5.5 Meters
- Table 4. Dimensions—Models UBX and UBZ
- Table 5. Dimensions—Models UDX and UDZ
- Table 6. Clearances to Combustibles
- Table 7. Unit Weights
- Table 8. Determining Confined Space Combustion Air Requirements
- Table 9. Technical Data for UBX and UBZ Models (Unit Sizes 030–125)
- Table 10. Technical Data for UBX and UBZ Models (Unit Sizes 150–400)
- Table 11. Technical Data for UDX and UDZ Models (Unit Sizes 030–125)
- Table 12. Technical Data for UDX and UDZ Models (Unit Sizes 150–400)
- Table 13. Field-Installed Options
- Table 14. Gas Supply Line Sizes
- Table 15. Gas Connection Sizes
- Table 16. Pressure Switch Settings
- Table 17. Circuit Board (DSI Control Module) Display Codes
- Table 18. Operating Sequence (Normal Heat Cycle)
- Table 19. Operating Sequence (Abnormal Heat Cycle)
- Table 20. Fault Modes
- Table 21. Required Manifold (Outlet) Gas Pressure
- Table 22. Inputs and Capacities by Elevation in US
- Table 23. Inputs and Capacities by Elevation in Canada
- Table 24. Fan Blade Spacing
- Table 25. General Troubleshooting
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I-UBX-UBZ-UDX-UDZ (04-21) 1034344-0
OPERATION
⚠ DANGER ⚠
• For your safety, read before operating. If you do not follow these instructions exactly, a fire or
explosion may result, causing property damage, personal injury, or loss of life.
• This appliance does not have a pilot. It is equipped with an ignition device which automatically
lights the burner. Do not try to light the burner by hand.
• Before operating, smell all around the appliance area for gas. Be sure to smell next to the floor
because some gas is heavier than air and will settle on the floor.
• WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Leave the building immediately.
• Immediately call your gas supplier from a phone remote from the building. Follow the gas
supplier’s instructions.
• If you cannot reach your gas supplier, call your fire department.
• Use only your hand to turn the gas control ON/OFF knob on the gas valve. Never use tools. If the
valve ON/OFF knob will not turn by hand, do not try to repair it. Call a qualified service technician.
Force or attempted repair may result in a fire or explosion.
• Should overheating occur, or the gas supply control system fail to shut off the flow of gas, turn
off the manual gas valve to the appliance before shutting off the electrical supply.
• Do not use this appliance if any part has been under water. Immediately call a qualified service
technician to inspect the appliance and to replace any part of the control system and any gas
control which has been under water.
• All components of a gas supply system must be leak tested prior to placing equipment in service.
NEVER TEST FOR LEAKS WITH AN OPEN FLAME. Failure to comply could result in personal
injury, property damage, or death.
Pre-Startup Checklist
Check the following before startup:
Check to ensure that all screws used to secure shipping brackets have been re-installed in heater cabinet
Check suspension—unit must be secure and level
Check to ensure that clearances from combustibles are in accordance with Table 6
Check vent system to ensure that it is installed in accordance with appropriate venting instructions listed in Table 1
Check piping for leaks and proper gas line pressure and bleed trapped air from gas lines (refer to Supply Piping
Connections section)
Check electrical wiring—ensure that all wire gauges are as recommended—service disconnect switch should be
used—verify that fusing or circuit breakers are adequate for load use
Check polarity—verify that line voltage exists between black L1 wire and earth ground
If installation elevation is >6,000 feet (>1,830 meters), replace pressure switch in accordance with Pressure
Switch Replacement section
Startup
Startup Procedure
Startup the heater as follows:
1. Set thermostat at lowest setting.
2. Turn OFF all electric power to appliance.
NOTE: This appliance is equipped with an ignition device that automatically lights the burner. Do
not try to light the burner by hand.