A C 39 express

[eagleone]

I have seen where a few of us had problems with the ac this year, tryed to use ours this pass weekend and no luck, it starts to cool water is pumping and compressor runs for 45 sec. then shuts off when running it is drawing 22 amps when it comes back on the amp meter pegs and trips the main breaker. When I start it back up same thing 45 sec shuts off then come back on then it pegs the meter then trip main 30. Was working fine at he end of last year.

 

[hottoddie]

Try switching between cool and heat mode a few times but wait several minutes between each attempt to switch.

 

[eagleone]

Went down to the boat today did the cool then the heat after about 5 min, they turned it to cool and it working fine, tryed that this wk. end but must of not waited long enough between tryes . thank you .

jim

 

[nickdcj7]

that sounds like exactly what mine was doing. I tracked it down to the pump relay under the stairs. They use a solid state relay, and it was starting to fail. I had noticed the pump hiccup a few times when I was working on the engines, but I was expecting to find a loose wire or something. What i found was the relay was pulling down the voltage from the a/c unit, then it would start dropping out power to the water pump. The amps going to the A/c would start to climb as the pressure built up from lack of water flow, then the high pressure switch would shut off the compressor. Of course, once the compressor shuts off the line pressure drops, and then the compressor tries to restart. It can't actually start the compressor that soon after shutting off, so it lock rotors the motor and the amps peg the meter and then trip the 30 amp breaker.

Go in the bilge and listen to the pump running. If you hear it stuttering, it's probably this. You can also check the coil side voltage on the pump relay. Mine was fluctuating between 50-90 volts. It should be steady at 120 volts when the compressor is running.

 

[DougLas]

I had problems with the front unit kicking out the breaker. Found out the line had a lot of sludge in it. To cure this problem hook up the unit to a hose on the dock. Block the water from running to the back unit and let the water run through the front unit only. Then block off the front unit and let it run through the back unit only. It is amazing how much sludge will come out of both units. The lines can be pinched off with vice grips and small blocks of wood. The water pressure on the dock and volume are by far more powerful then the sea pump flow.

 

[eagleone]

I got the aft unit running again, but still working on front one, don't here the compressor come on with that one, not even sure it is getting water, blower runs and that is it.

thanks again
jim

 

[DougLas]

The hose on the dock can be attached to the sea water pump in the bilge. Turn on the dock water and block off with the channel locks and wood the hose that goes to the unit you don't want to have water run to it. then switch to the other unit blocking it off with Channel locks.