7 Wire Thermostat Wiring Diagram For Trane. Then look up the old thermostats wiring diagram on the internet and see if you can find out what 12 3 are controlling on your old thermostat. It is a red wire and comes from the transformer usually located in the air handler for split systems but you may find the transformer in the condensing unit.
This article gives a table showing the proper wire connections nearly all types of white rodgers room thermostats new and old used to control heating or air conditioning equipment including the white rodgers f90 2 wire and 3 wire thermostat installations. Comfortlink ii trane heat. Try to find out if you have a common wire.
Fan runs all the time 1 fan mode is set to on.
120 118 116 114 112 122 120 118 116 114 78 80 82 84 86 88 90 92 94 96 98 100 102 104 106 108 110 112 114 116 118 120 122 124 fig. Place a digital am meter over the. 3 phase contactor wiring diagram start stop. 1 field wiring diagram for single stage heatingcooling outdoor section without transformer from dwg.