Question about Honeywell Programmable Thermostat Heater

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I bought a Honeywell programmable thermostat RTH2310 to replace my 10 year old Honeywell thermostat. My old thermostat is a 4 wire system but also has a jumper from Y to 1. New system does not tell me what to do with the jumper (red) wire that goes from Y to 1 (I believe it to be for A/C). The thermostat is for gas heat and central a/c. Where does the "red" jumper cable go in new rth2310?

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It depends on the type of thermostat you have.
Do you have a 4 wire or 5 wire T'stat?
The red jumper wire was for a 5 wire t'stat with 1 transformer, the red jumper actually should have been from R to 1.
So you need to trace the wires back to the furnace and make sure they go to the locations identified below.
if you have a 4 wire t'stat then you don't need that jumper, if you have a 5 wire t'stat then you do need that jumper but it should go from Rh to Rc.
4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
t'stat?

Posted on Nov 23, 2009

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If all you have is a 4 wire system, then your new thermostat will be hooked up just as it was ( r,w,y,g) and if there is no jumper on the new thermostat, then you shouldn't need one. The jumper on some thermostats are used for internal controls and is just a way that that certain thermostat works.

Posted on Jan 23, 2010

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