paul_h
04-02-2011, 08:22 AM
Stuck with one of these old carrier systems right now.
Back story is thermostat cable damaged, so replaced by an electrician.
Apparently it worked OK for a while but now it will start, but once it's cycled off and won't start back up.
The contactor is buzzing away and if you press it in, it holds and runs normal, and cycles off again normally whenever the thermostat stops calling for compressor. It seems to be wired up OK, just something in the outdoor unit playing up. HP and LP switches are fine, time delay I don't know(not really good at testing the old cube, I just bridge and if it still doesn't work, look elsewhere and assume the cube is fine)
What I need to know is what type of interlock is in the circuit to hold the contactor in when manually pushed in, and what part of the control circuit is stopping it operating.
I've checked all the safetys and they're OK, but don't even have a circuit diagram that's legible anymore.
Anyone know much about these dodgey control PCB carriers?
Back story is thermostat cable damaged, so replaced by an electrician.
Apparently it worked OK for a while but now it will start, but once it's cycled off and won't start back up.
The contactor is buzzing away and if you press it in, it holds and runs normal, and cycles off again normally whenever the thermostat stops calling for compressor. It seems to be wired up OK, just something in the outdoor unit playing up. HP and LP switches are fine, time delay I don't know(not really good at testing the old cube, I just bridge and if it still doesn't work, look elsewhere and assume the cube is fine)
What I need to know is what type of interlock is in the circuit to hold the contactor in when manually pushed in, and what part of the control circuit is stopping it operating.
I've checked all the safetys and they're OK, but don't even have a circuit diagram that's legible anymore.
Anyone know much about these dodgey control PCB carriers?