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1950s Janitrol Gas Furnace won't auto turn off
I bought a house about 5 months ago that was built in 1953 and has a pretty serious hvac system. I know its an antique and needs to be replaced, but since it still works rather well, I've decided to wait until next spring. Its a forced air furnace by Janitrol; model: FEC 180-84k; Input: 180,000 Btu. / Output: 144,000 Btu.; Type D; S#: 0451f0814. The a/c doesn't cool as well as i'd like but at least it does (sort of) communicate with the thermostat. When i want to switch the system from a/c to heat i have to flip a lever on the unit (i believe it used to have a motor that made the switch but has burned out). i turned the t.stat to off, switched the lever and turned the gas to on. the giant burners sparked a little but lit right up. within 5-7 minutes my 3200+ sqft house was nursing home hot--from 65 degrees to 80. i tried lowering the t.stat to the lowest temp and it didn't turn off, then i turned the t.stat off and still nothing happened. after 45 min i had to go back to the unit and turn the gas off to get it to stop blowing. Also, it seems like the t.stat thermometer is innacurate. i noticed this summer that the thermostat and i had wildly different opinions about what 70-73 feels like. It would read 67-70 but felt like high 70s in the house. i often had to turn it down to 60 just to get it to kick on. I haven't had the best luck finding a professional that knows much at all about the system. A few months ago, I met with a previous owner of the house and he came over and showed me how to work everything, but since it was 110 outside i wasn't terribly concerned about the heater. he showed me how to switch the system over to heat from a/c and showed me the "pilot cock" but other than that i don't recall anything else. Should i have kept the thermostat on and set to heat before switching the unit over, instead of turning it off? Any info./suggestions or leads on a manual would be much appreciated.