Hi all I have a cruisair SMX II system with 3 evaporators (one in each cabin), each controlled using SMXir keypad. All units have electrical heating built in. One of them does not heat and throw the rccb breaker (is it the correct English word ??) after 1-2 minutes of operation, which lets me think of a short circuit of the heater to ground, at least with some resistance which over the time releases the rccb. The question is, can the electric heating unit be repaired or changed inside the EHMB4C? thanks a lot for help!
Most cruiseair marine a/cs heat by using a reversing valve to reverse the direction of the freon. Lots of times these reversing valves go bad from lack of use. Does the unit run without tripping the breaker on air conditioning? Sounds to me like your compressor is going bad or another issue if it's tripping the breaker after 1-2 minutes. Usually if the reversing valve is bad it will just blow air conditioning when it's set on heat.
This type of evaporator does not use reverse cycle heating, but it heats with compressor shut off and using a built in electrical heating unit. That unit has a short circuit to ground from either phase or neutral wires, and question was if just the heater can be changed, or if I need to replace complete evaporator unit, which would mean filling the system with new freon. See picture, heating element is behind the silver plate.
Chillers and single state (cool only) compressors can use electric heater elements in the fan or before the fan. Pending physical room to reach and work on it, it could be serviceable in place and not have the open the coolant or Freon lines.
Yeah, I assumed since he only has 3 evaporator units that it was not a chiller system. Generally the older split units just used reverse cycle only and the new ones in the last few years do have an add on heating element, but figured it wouldn't be an issue this early in the game.