Dougie Brown
Well-known member
I've removed the original CM stat in the coach in readiness for replacement with a new Honeywell RTH221B. I will also fit a SPDT switch to provide Hi/Lo fan which isn't on the stat. I've identified the existing wiring without difficulty, but I'm left with two questions:-
1) The two gray wires provide freeze protection. I'm reading that other conversions have simply abandoned them on the basis that the compressors will cut out anyway although with no error message on the stat. Is this going to be a crucial problem?
2) I have two compressors. They are fed by one yellow (Y1) and one orange (Y2) wires on the board. The new stat has only a Y contact, and other conversions have simply connected both compressor wires together. What are the consequences of this? I understand that the Winnebago power management system will still power down one compressor in the event of more than 30A being demanded.
I don't want to compromise anything on the air side.
Dougie.
1) The two gray wires provide freeze protection. I'm reading that other conversions have simply abandoned them on the basis that the compressors will cut out anyway although with no error message on the stat. Is this going to be a crucial problem?
2) I have two compressors. They are fed by one yellow (Y1) and one orange (Y2) wires on the board. The new stat has only a Y contact, and other conversions have simply connected both compressor wires together. What are the consequences of this? I understand that the Winnebago power management system will still power down one compressor in the event of more than 30A being demanded.
I don't want to compromise anything on the air side.
Dougie.