OPERATION—CONTINUED
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 3.
Check vent system to ensure that it is installed in accordance with Vent Connections section.
Check condensate drain system to ensure that it is installed in accordance with Condensate Drain Installation
section.
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
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 combination gas valve (see Figure 28).
40
UEZ-IOM (07-23) 1034347-I
Top View
ON/OFF Switch
Figure 28. Combination Gas Valve ON/OFF Control
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