The gas valve on the G50UHi will be equipped with either a gas control knob or lever. Use only your hand to turn the gas control knob or push the gas lever. Never use tools. If the knob or lever will not move by hand, do not try to repair it. Call a qualified service technician. Force or attempted repair may result in a fire or explosion.
Placing the G50UHi furnace into operation:
G50UHi units are equipped with a SureLight® ignition sys. tem. Do not attempt to manually light burners on these fur. naces. Each time thermostat calls for heat, the burners will automatically light. The ignitor does not get hot when there is no call for heat on units with the SureLight® ignition sys. tem.
Operating the Gas Valve (Figures 3, 4 and 5)
1 - STOP! Read the safety information at the beginning of this section.
2 - Set the thermostat to the lowest setting. See figure 2. 3 - Turn off all electrical power to the unit.
THERMOSTATS |
FIGURE 2
4 - This furnace is equipped with an ignition device which automatically lights the burners. Do not try to light the burners by hand.
5 - Remove the upper access panel.
6 - White Rodgers 36E/36F Gas Valve - Switch gas valve lever to OFF.
Honeywell VR8205 Gas Valve - Turn knob on gas valve clockwise 
to OFF. Do not force. See figure 5.
7 - Wait five minutes to clear out any gas. If you then smell gas, STOP! Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instruc. tions. If you do not smell gas go to next step.
8 - White Rodgers 36E/36F Gas Valve - Switch gas valve le. ver to ON. See figure 3 for the White Rodgers 36E valve and figure 4 for the White Rodgers 36F valve.
Honeywell VR8205 Gas Valve - Turn knob on gas valve
counterclockwise 
to ON. Do not force.
White Rodgers 36E Series Gas Valve | |
| MANIFOLD |
| PRESSURE |
| ADJUSTMENT |
| SCREW |
| MANIFOLD |
| PRESSURE |
| OUTLET |
GAS VALVE SHOWN IN OFF POSITION | |
FIGURE 3 |
|
White Rodgers 36F Series Gas Valve | |
| MANIFOLD |
| PRESSURE |
| ADJUSTMENT |
| SCREW |
| MANIFOLD |
| PRESSURE |
| OUTLET |
GAS VALVE SHOWN IN OFF POSITION | |
FIGURE 4 |
|
Honeywell VR8205 Series Gas Valve | |
MANIFOLD | MANIFOLD |
PRESSURE | PRESSURE |
ADJUSTMENT | OUTLET |
SCREW |
|
ON |
|
OFF |
|
GAS VALVE SHOWN IN OFF POSITION | |
FIGURE 5 |
|
9 - Replace the upper access panel. |
|
10 - Turn on all electrical power to to the unit. | |
11 - Set the thermostat to desired setting. | |
NOTE - When unit is initially started, steps 1 through 11 may need to be repeated to purge air from gas line.
12- If the appliance will not operate, follow the section •Turning Off Gas to the Unit" and call your service tech. nician or gas supplier.
Turning Off Gas to the Unit
1 - Set the thermostat to the lowest setting.
2 - Turn off all electrical power to the unit if service is to be performed.
3 - Remove the upper access panel.
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