I have a heat pump with backup gas furnace. There is a ¾” PVC pipe coming from the unit going into a non-submersible pump, and a barbed fitting with a roughly ¼” clear plastic tubing running from it.
The pump plugs into a regular outlet, and there are two small gauge wires, (for control, or sensor?) running from it into the larger unit.
I presume that condensation drips from the coils down through the PVC pipe and into the reservoir of the pump, and that there is a small float or something that turns on the pump when it gets full and pumps it overboard somewhere through the clear tube.
The problem is this:
- Yesterday I replaced my water heater, and in the process I needed to disconnect this pump for clearance. After I finished with the water heater I didn’t bother reconnecting things because I need to remount this pump in a different location and re-configure the PVC pipe bends to reach it.
- Overnight it got pretty chilly. I don’t think it was cold enough to trigger the gas furnace, but quite chilly, and it seemed that there was no “normal” heat being circulated.
- Is some level of water in the pump reservoir necessary to allow the heat pump and furnace to operate?
- Are the two small gauge wires needed to tell the system that there is a pump installed, and that if not connected the system will not function?
Disclaimer: We have a fancy touch screen thermostat that I haven’t figured out. My wife controls the temperature in the house, (because she cares more…) and last night she was out of town. It wouldn’t be like her to turn it down during the day before she left yesterday, but it is possible that it is just set lower than normal, and with her not being here it wasn’t turned back up in the morning. (I would have suspected warmer than normal during the night due to her not turning it down...)