Heat pump keeps running
- Thread starter Mike2007
- Start date
Different system but my gas CH boiler has a permanent feed and it powers the pump, the controller supplies the power for stats and valves which in turn give the signal to enable the boiler. Depending on the way it's wired, it is possible for a stuck valve to be supplying a permanent enable.
I don't know if that makes any sense on your system.
Yeah, pretty sure it's two currents on a heat pump. The programmer operates the coil on the contractor, which switches the higher current for the motor.
Thanks anyway
Not necessarily, and actually unlikely - it's down to the designers how they control things. For modern units, I'd expect the external controls to merely signal the internal controller of the heat pump that heat is required. The internal controller will then take care of running up the motor (may be DOL starter, many are inverter driven these days), and also taking care of things like auto-defrost, safe shutdown (some systems "park" the refrigerant in a specific part of the system to avoid compressor damage on startup), pump run-on, etc. The days of simply turning on the power and the compressor runs are long gone.
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