Typical Startup Instructions for a Standing-Pilot Gas Furnace
The startup procedure for most standing-pilot gas furnaces is very similar, particularly insofar as use of the thermostat is concerned. The major difference is in the lighting of the pilot burner, and this will depend on the gas valve used.
Caution
Always carefully follow the furnace manufacturer’s lighting and operating instructions when attempting to start a furnace. Failure to do so may cause a fire or explosion resulting in pos- sible injury or even death.
The startup procedure for a standing-pilot gas furnace may be summarized as follows:
1. Open all warm air registers.
2. Shut off main gas valve and pilot gas cock, and wait at least 5 minutes to allow gas that may have accumulated in the burner compartment to escape.
Warning
If you smell gas after waiting 5 minutes, immediately call your local gas company (utility) from a telephone outside the house and follow their instructions.
3. Set the room thermostat at the lowest setting.
4. Open the water supply valve if a humidifier is installed in the system.
5. Turn off the line voltage switch if one is provided in the fur- nace circuit.
6. Light the pilot (see below).
7. Turn electrical power on.
8. Replace all access doors.
9. Light main burners by setting the room thermostat above the room temperature.
10. Set the room thermostat at the desired temperature after the main burners are lighted.
The pilot lighting instructions for a standing-pilot gas furnace should be included with the furnace and prominently displayed. Lighting instructions for the 24-volt Honeywell V8280, V8243, and Robertshaw (Unitrol) 7000 combination gas valves basically summarize the pilot-lighting procedure (Figure 11-47). The procedure is as follows:
1. Depress gas cock dial and turn it counterclockwise to “pilot” position.
2. Keep gas cock dial depressed and light pilot with a match.
3. Keep dial depressed until pilot remains lighted when released.
4. Depress dial and turn counterclockwise to ON position.
