Digital Thermostat Installation in RV HVAC Systems
TEXT OF ALAN PASKEY'S ARTICLE as FOLLOWS (FOR COLEMAN UNITS) The wires coming out of the a/c are as follows:
Red | = | +12 VDC |
Blue | = | |
Green | = | Fan High |
Gray | = | Fan Low |
White | = | Furnace |
Yellow | = | Compressor |
The wire terminals on the new stat are as follows:
RC | = | cooling relay |
RH | = | heating relay |
G | = | Fan |
W | = | Heat |
Y | = | A/C compressor |
I hooked up everything as follows:
RC | = | Red wire |
RH | = | Red wire |
G | = | see notes below |
W | = | White wire |
Y= Yellow wire
Notes:
1.I did not use the Blue wire
2.I took a wire from "G" on the stat to the common on a single pole double throw (SPDT) switch... I wired the fan high and fan low to the switch... This allows me to still control the high and low of the fan just like the old stat...
3.This has worked for me but I can't make any promises for anyone else... A little research should be able to determine if it will work for you or not...
4.Total cost: $19.99 +tax for the stat from Wal Mart and $2.99 +tax for the switch from Radio Shack...
Hope this helps someone else out. - Alan Paskey
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