"Gentlemen,
Perhaps you
"Gentlemen,
Perhaps you can help me with a marine HVAC problem that I am having with my 1985 Carver 32 Aft Cabin. The vessel has a 16,000 BTU Marine Air Systems (now Dometic) HVAC unit (actually two units tied together, one in the salon and one in the aft cabin). They share a common water pump and a common electrical relay box with two relays. The HVAC unit model number is RRK4-0126-PAA, and each of the relay model numbers are 240A25.
Both units cooled perfectly last summer and heated adequately this winter, but this spring they quit (and popped the circuit breakers) due to a siezed water circulation pump. I replaced the pump with an exact replica which pumps well. When I tried to restart the HVAC units, the Aft Cabin unit ran fine however the Salon unit fan ran properly but the compressor engages and immediately disengages after less than 2 seconds. When this happens the ampmeter swings wildly. It will "hit" on and off a few times and eventually pop the breaker. The boat is tied to shore power via 2 30A cables plugged into a 50A Y at the pole (a common setup) and while doing routine maintenance the other day I noticed that one of the cable plug terminals (that feeds the panel containing the HVAC breakers)was fried. I thought that this bad cable may have been the problem with the HVAC but now I think that the HVAC may have caused the cable to fry. I replaced the cable and still had the same problem with the unit.
My suspicion is that the relay is the problem. Are there any tests that I can possibly use to tell if that is the case? Any other ideas?? I have attached a photo of the electrical box wiring diagram that houses both relays. Unfortunately the budget will not accomodate a service charge from the marine HVAC man and any help would be much appreciated. It's going to get mighty hot here in South Carolina very soon!!
Sincerely,
Joe"
Perhaps you
"Gentlemen,
Perhaps you can help me with a marine HVAC problem that I am having with my 1985 Carver 32 Aft Cabin. The vessel has a 16,000 BTU Marine Air Systems (now Dometic) HVAC unit (actually two units tied together, one in the salon and one in the aft cabin). They share a common water pump and a common electrical relay box with two relays. The HVAC unit model number is RRK4-0126-PAA, and each of the relay model numbers are 240A25.
Both units cooled perfectly last summer and heated adequately this winter, but this spring they quit (and popped the circuit breakers) due to a siezed water circulation pump. I replaced the pump with an exact replica which pumps well. When I tried to restart the HVAC units, the Aft Cabin unit ran fine however the Salon unit fan ran properly but the compressor engages and immediately disengages after less than 2 seconds. When this happens the ampmeter swings wildly. It will "hit" on and off a few times and eventually pop the breaker. The boat is tied to shore power via 2 30A cables plugged into a 50A Y at the pole (a common setup) and while doing routine maintenance the other day I noticed that one of the cable plug terminals (that feeds the panel containing the HVAC breakers)was fried. I thought that this bad cable may have been the problem with the HVAC but now I think that the HVAC may have caused the cable to fry. I replaced the cable and still had the same problem with the unit.
My suspicion is that the relay is the problem. Are there any tests that I can possibly use to tell if that is the case? Any other ideas?? I have attached a photo of the electrical box wiring diagram that houses both relays. Unfortunately the budget will not accomodate a service charge from the marine HVAC man and any help would be much appreciated. It's going to get mighty hot here in South Carolina very soon!!
Sincerely,
Joe"