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