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UBXC-UDXC-IOM (01-24) 1042980-0
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
Start up 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.
3. Open access door and locate gas control (ON/OFF) knob or switch on gas valve (see Figure 21).
Figure 21. Gas Valve ON/OFF Control
4. Turn gas control switch to OFF or turn knob clockwise to OFF.
5. Wait 5 minutes to clear out any gas and then smell for gas (including near floor).
a. If you smell gas, STOP! and follow steps in DANGER message listed above or on heater operating label.
b. If you do not smell gas, proceed to step 6.
6. Turn gas control switch to ON or turn knob counterclockwise to ON.
7. Close access door.
8. Turn ON electric power to heater.
9. Set thermostat to desired setting.
a. If heater does not operate, follow instructions in step 13 or on heater operating label and call your service
technician.
b. If heater operates, thermostat calls for heat, which energizes venter motor.
10. Pressure switch closes, which fires unit.
11. Burner flame is sensed and in 30 seconds after combination gas valve is energized, fan motor is energized.
12. If flame is extinguished during main burner operation, integrated control system closes main valve and must be
reset by interrupting power to control circuit (refer to lighting instructions provided with heater).
Top View
ON/OFF Switch
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