The thermostat manufacturer cross reference is listed next. C 24 vac common you might see blue purple or brown typically used for this wire.
Honeywell Heat 1cool User Guide Page 32
Bay28x138 wiring diagram. Find the best information and most relevant links on all topics related tothis domain may be for sale. But here is a list of the most common wire color mappings as seen in many four wire t stat setups. Bay28x138 a o m. The table above provides a more complete list of honeywell thermostat wiring colors and their uses. A a mra bay28x153a 2 heat1 cool manualchangeover heatoffcoolsystemswitch autoonfan switch. I need a wiring diagram for the bay28x138 or the bay28x140 i tried to change the thermostat but didnt know it was a answered by a verified hvac technician.
Find your bay28x138 wiring diagram nest here for bay28x138 wiring diagram nest and you can print out. Search for bay28x138 wiring diagram nest here and subscribe to this site bay28x138 wiring diagram nest read more. General information section are the internal schematics wiring diagrams and sequence of operation information for the electronic thermostats. Labeled terminal boardfor simplified wiring factory wiredfornon restrictedmode canbewiredforrestrictedmode replacement. Honeywell thermostat wiring diagram 4 wire examples. Finally there is the heat pump manufacturer cross reference including tips on how to use it.
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