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
33
I-UBX-UBZ-UDX-UDZ (04-21) 1034344-0
Measure and Adjust Manifold (Outlet) Gas Pressure
If the heater is being installed at an elevation ≤2,000 feet (≤610 meters), adjust the manifold (outlet) gas pressure in
accordance with the Measure and Adjust Manifold Gas Pressure—Elevation ≤2,000 Feet (≤610 Meters) section.
If the heater is being installed at an elevation >2,000 feet (>610 meters), adjust the manifold (outlet) gas pressure in
accordance with the Measure and Adjust Manifold Gas Pressure—Elevation >2,000 Feet (>610 Meters) section.
⚠ WARNING ⚠
Valve outlet gas pressure must never exceed 3.5 IN WC for natural gas or 10 IN WC for propane.
The maximum inlet supply pressure for natural gas or propane is 14 IN WC. Maximum gas pressure
can never be exceded either during operation or when unit is static (with lock-up regulator).
⚠ CAUTION ⚠
Before attempting to measure or adjust valve outlet gas pressure, the inlet supply pressure must
be within the specified range, both when the heater is in operation and when it is on standby.
Incorrect inlet pressure could cause excessive valve outlet gas pressure immediately or at some
future time. If natural gas supply pressure is too high, install a regulator in the supply line before
it reaches the heater. If natural gas supply pressure is too low, contact your gas supplier.
NOTES:
• Measuring outlet pressure cannot be done until the heater is in operation.
• During normal operation at sea level, adjustment to factory-setting should not be necessary.
• For natural gas: when the heater leaves the factory, the combination gas valve is set so that the
valve outlet gas pressure for a single-stage valve or high fire of a two-stage valve is regulated
to 3.5 IN WC. Low fire on a two-stage valve is set to 1.8 IN WC. Inlet supply pressure to the valve
for natural gas must be a minimum of 5 IN WC or as noted on the rating plate and a maximum of
14 IN WC.
• For propane: when the heater leaves the factory, the combination gas valve is set so that the
valve outlet gas pressure for a single-stage valve or high fire of a two-stage valve is regulated to
10 IN WC. Low fire on a two-stage valve is set to 5.0 IN WC. Inlet supply pressure to the valve for
propane must be a minimum of 11 IN WC and a maximum of 14 IN WC.
• Gas conversion kits are available for changing from propane to natural gas or natural gas to
propane. A factory-authorized conversion kit MUST be used.
Measure and Adjust Manifold Gas Pressure—Elevation ≤2,000 Feet (≤610 Meters)
For installations at normal elevations, measure and adjust the manifold (outlet) gas pressure as follows:
1. Turn knob or switch on top of valve to OFF to prevent flow to gas valve.
NOTE: A manometer (fluid-filled gauge) is recommended rather than a spring-type gauge due to
the difficulty of maintaining the calibration of a spring-type gauge. Use a water column manometer
that is readable to the nearest tenth of an inch.
2. Connect manometer to 1/8-inch output pressure tap on valve (see Figure 15).
3. Open manual valve and operate heater. For models UBZ and UDZ, depress and hold door safety switch.
4. Observe manometer gauge to measure outlet pressure of gas valve. To measure low-stage pressure on unit
equipped with two-stage valve, disconnect wire from the HI terminal on valve. Be sure to reconnect wire.