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Question About Honeywell Thermostat RTH6400B
wiring...

Exisiting honeywell ct87A-4447-1 has 5 wires (r,g,w,y,b). the new honeywell RTH6400B only calls for r,g,w,y (no blue) wires. What do I do with the blue wire

Asked by paul on 10/31/2008 1  Answer

ManualsOnline posted an answer 16 years ago

The ManualsOnline team has found the manual for this product! We hope it helps solve your problem. Get the Manual Here

Alex posted an answer 15 years, 11 months ago

2 The B wire is the call for heat changeover valve in a heat pump system. If you have a conventional heat system (gas or oil), tape it off and forget it. If you do have a heat pump system, you need either B or O call. Do not go by wire color. Make sure it was/is attached to B terminal on the old t-stat. Sanity check: see if the B wire is even attached to the heater/furnace (probably not).
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