Posted by Stan Coryell on December 21, 2022 at 12:33:18 from (107.77.204.114):
In Reply to: Re: Furnace posted by rlp in Co. on December 21, 2022 at 12:14:46:
It doesn't matter if it's 22 VAC or 28 VAC. I would expect to measure 26 or 27 VAC. Remember thermostat wire length and load will lower the voltage. Years ago thermostats had heat anticipators (sp?) to compensate for wire length. They went away with mercury.
As a side note, most modern 2 stage units no longer use a 2 stage thermostat. The stages are controlled by an algorithm. For the past 25? Years we have not had standing pilots. Why do heaters have to have a smart valve? The valve was dumb and the controls were smart. Now we have a gas valve costing twice as much as before with ZERO additional safety factors. (I'm sure the control boards still cist the same)
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