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
High Temperature Limit Control
⚠ WARNING ⚠
The automatic-reset high temperature limit control will continue to shut down the heater until the
cause is corrected. Never bypass this control as hazardous conditions could result.
All units are equipped with a temperature-activated, automatic-reset high temperature limit control (see Figure 12
for location). The control is factory-set and is non-adjustable. If the setpoint is reached, the control interrupts the
electric supply to the gas valve. This safety device provides protection in the case of motor failure or lack of airflow
due to a restriction at the inlet or outlet.
Flame Rollout Switch (UDX Model Unit Sizes 030–125)
⚠ DANGER ⚠
If the manual-reset flame rollout switch activates, identify and correct the cause before resetting
the switch. Never bypass the flame rollout switch; hazardous conditions could result.
UDX model unit sizes 030–125 are equipped with a temperature-activated, manually-reset flame rollout switch (see
Figure 12 for location). The flame rollout switch is located at the top of the burner assembly. The switch is factory-
set and is non-adjustable. If the setpoint is reached, the switch interrupts the electric supply to the gas valve. If the
flame rollout switch activates, identify and correct the cause before resetting the switch.
Interlock Door Switch (UBZ and UDZ Models)
All unit sizes of UBZ and UDZ models are equipped with an interlock door switch (see Figure 12 for location) that
prevents the heater from operating when the service door panel is open. The service panel is equipped with a pliable
gasket that fully seals the door to provide added protection to prevent building air from entering the combustion
zone of the heater.
Main Operating Gas Valve
⚠ WARNING ⚠
The main operating gas valve is the prime safety shutoff. All gas supply lines must be free of dirt
or scale before connecting the unit to ensure positive closure.
The main operating gas valve (see Figure 12 for location) is powered by the 24V control circuit through the thermostat
and safety controls. The diaphragm-type valve is pre-set at the factory and provides regulated gas flow.
Fan Motor
The fan motor is equipped with automatic-reset thermal overload protection. If the motor does not run, the cause
may be due to improper current. Ensure that the correct voltage is available at the motor.
NOTE: If the unit is equipped with an optional, totally-enclosed motor or optional voltage, the mo-
tor’s horsepower may be greater than the standard motor. Refer to the motor nameplate to verify
its horsepower.
Venter Motor
The venter motor (see Figure 12 for location) is assembled to the venter wheel and operates to provide combustion
airflow. Operation is controlled by the circuit board (see Figure 11). Refer to the Circuit Board (DSI Control Module)
section for details.