Replacement Wiring compatability

I am tring to replace a Trane BAYSENS008B thermostat That has 5 wires as follows Terminal #1 BLUE,Terminal#2 RED,Terminal#3 YELLOW, Terminal#4 Green, Terminal#5 White,with a HONEWELL RTH7500 on what terminals do place my existing wires on the new thermostat?
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The chances that any body reading on this goup has the exact two thermostat models you are asking about in hand approaches zero as an upper limit.
Assuming that the presently installed Trane worked correctly at some time, get out your Trane manual for the Trane unit and find out from the manual what the *function* of each of the terminals on the Trane unit is or was. Write those down, e.g. Terminal 1 Blue = heat on, Terminal 3 Yellow = AC on, etc.
Then look in the manual for your new Honeywell and find out what functions go with what terminals in the Honeywell. Write those down. Then match up the functions with the correct color wires.
Consider labeling each wire for its function befre disconnecing the Trane, and keep those labels on each wire after connecting up the Honeywell.
If you don't have a manual for Trane, google for their web site, find a manual, download and print it out.
dancensound wrote:

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jJim McLaughlin wrote:
red-white-yellow-green are actually rather standard.
red - power to thermostat white - heat yellow - air conditioning green - air circulation fan
For example connecting red and white gives you heating.
blue - could be several things, like the other side of 24V if needed for control power for electronics or clock.
Without looking it up, the Honeywell stat probably labels the terminals with wire color - R, W, Y, G.
Any letters at the Trane t-stat connections? Or letters at the furnace-end connections? Or as Jim said, look for a manual for the stat or furnace.

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