Gas Heat ESCO Practice Exam

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If a gas furnace is installed at a high altitude, which adjustment is necessary for proper operation?

Adjust gas valve
Calibrate thermostat
Increase fan speed
Reduce combustion air

The correct answer is: Adjust gas valve

When a gas furnace is installed at a high altitude, the air density is lower which can affect the amount of oxygen needed for combustion. This means that the gas flow needs to be adjusted to achieve the proper air-fuel mixture. Therefore, option A, adjusting the gas valve, is necessary for proper operation at high altitudes. The other options, calibrating the thermostat, increasing fan speed, and reducing combustion air, are incorrect because they do not address the issue of adjusting the gas flow for proper combustion. Calibrating the thermostat may affect temperature control, increasing fan speed may only circulate more air and not necessarily adjust the gas flow, and reducing combustion air may result in a lack of oxygen for proper combustion.