Duo Therm Heat/AC function question
I'm now sitting in the south, fortunately, I have two roof heat pumps so we are comfortable enough with that AC running. The rear unit was installed new with the front unit in 2oo9, both are clean and...
Forum Discussion
Chris Bryant wrote:
FWIW, new Dometic heat pumps are reversed, and energize the solenoid in heating, not cooling.
Makes it somewhat of a pain to match control systems, and people see the new CCC2 and try to convert- barely possible with a major (warranty voiding) hack.
I think Dometic changed the function for 2 reasons.
1. Since COLD is the primary function, they wanted the fail mode to default to cooling.
2. By changing the design, Dometic HP's now have 3 fan speeds instead of 2. (The Med speed wire was used to engage the Reversing coil on the old units).
Last, it is extremely RARE for the mechanical reversing valve to fail. It is usually the Energizing solenoid that fails, which is a replaceable part. Also, when ordering the reversing solenoid, you usually get 2 types in the box. Dometic used 2 types and they have no way to determine which models used one or the other. Doug
