So the condensate pump died tonight. fortunately I was in the basement and heard the water before more than a quart had leaked out on the floor.
So I’ve had to run to the HD and get a Flotec “utility pump”. It has two wires for an alarm/cutoff switch. But it seems to indicate that you have to know if your furnace supports “interruptible” power or something like that.
Of course, the lennox service manual I have for the furnace doesn’t really say much either way.
(what really ticks me off is that I had the AC serviced/cleaned and they supposedly checked the pump but there was like an inch of nasty sludge/grime at the bottom).
Anyway, back to the original question. Anyone know if the lennox “supports” this?
From what I can tell, the pump is wired to the thermostat (one wire) and the other to the furnace.
If not, then I have to just change a wire on the pump, but I figure if I can take advantage of that feature, I might as well (ie, if I’m not home and the pump dies, it’ll shut off power to the furnace, vs. sounding an alarm/beep but keep flooding things)
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First make sure the switch is in "cutoff" rather than "alarm" mode (it's generally a wire moved on the switch). Then wire the switch in series with the heating signal from the thermostat. If you have a multi-zone controller wire in series with the "heat" signal from the controller to the furnace proper.
I have ours rigged to shut off the humidifier but not the furnace. If it overflows a little no big deal, since the unit is in an unfinished utility room with a floor drain.