Wiring a Condensate Pump

Old 04-26-21, 07:51 AM
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Wiring a Condensate Pump

I am installing a new Little Giant condensate pump on my gas hot air furnace. The old one did not have wires. I read that I should install the wires from the condensate pump in serial to the yellow wire coming from the thermostat. When I look at the low voltage wires attached to the furnace there are 2 wires going to the Y terminal. How can I tell which one to use? TIA
Old 04-26-21, 08:19 AM
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More common to wire into the R so that the entire system shuts down. Wiring to Y would only shut down the outside condenser - the furnace wouldn't shut down.
Old 04-26-21, 12:13 PM
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If you have a condensing furnace you should wire it in to the 24V hot as to shut the whole system down if the condensate overflows.
Old 04-26-21, 12:41 PM
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Hi, at the furnace control board you should see an R terminal, remove the wire from that presumably a Red wire and wire nut it to one of the control wires from the pump, the other wire from the pump will connect to the R terminal.
Geo 🇺🇸

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