Quote Originally Posted by magicniner View Post
I suppose that if they just put the voltage on it would be fair to assume that AC or DC didn't matter ;-)
That's what I thought when I used the relays (which I happened to have). The other relays in the main panel are OK, but they don't operate in a 'pulled in' mode 24/7, but this one has a safety relay function, if the gas fails or the electricity goes and the furnace drops below 800C then the air blower won't come back on and air pressure operates the gas solenoid. Above 800C the furnace will relight itself OK when the electricity supply comes back on, but then it will only operate in a low fire mode (reaching about 1000C) until manually reset to full operation, when it will go to the set temperature, normally 1250C.