I will ask my HVAC tech to do routine checkup soon.
But from owning different houses and different furnaces and watching them go through a few complete cycles, I have made the following observation:
1. Thermostat calls for heat
2. Electronic pilot ignites gas, temp rises until it reaches "Low-Limit" (around 120F)
3. Fan kicks in
4. Burners continue to work, temp continues to rise until it reaches "High-Limit" (around 180F), then the gas is cut off, fan continues to run until it cools down to minimum (around 120F) then furnace shuts off.
My questions are:
a. Is it normal for furnace to reach High-Limit on every cycle?
b. Is it a good idea if the HVAC tech adjusts the GAS VALVE down a bit so when burners run, they do not heat too much causing the HIGH-LIMIT switch to trip?
Potentially saving gas and money?
1991 Tempstar 80% Furnace