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Wiring a garrison thermostat model THM321 with a Rc and RH wire and only 1 R terminal.

I have 5 wires in the wall (RC, RH,Y,W,G) and only 4 terminals(R,Y,W,G). Manual says to attach RC and RH to corresponding terminals. There are no RC and RH terminals.

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Posted on Jan 02, 2017

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machtcl1
  • 61 Answers

SOURCE: I'm trying to install a

If the system worked before with three wires then the fan wire(green) must already be jumped to the Y terminal at the furnace. You should be able to run the red wire to Rh and Rc, run the white wire to W and run the yellow wire to Y on the new thermostat. You will not have control of the fan (ON or AUTO) from the thermostat. R is 24v from the furnace, W is the Heating circuit and Y is the Cooling circuit.

Posted on Jan 01, 2009

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carldc3
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SOURCE: Replacing a Williamson (White Rogers) Termostat

rh is power for cooling terminal and rh is power for heating terminal connect red wire to rc or rh and there should be a jumper between rc and rh if not install one all other wires are color coded correctly. now the blue wire is not used.

Posted on Jan 05, 2009

heatman101
  • 43501 Answers

SOURCE: three wire system, going to a five terminal

The Rc and Rh should have a jumper wire between them let it in. and hook the red wire to one of them it does not matter which one as they are jumpered. The white wire goes on the "w" terminal and the Blue wire will go on the "G" green terminal to run your fan.
This should get you up and running again!

Posted on Nov 13, 2009

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1 Answer

I have 4 wires green blue red and white my red is connected to the rh rc with jumper green connect to g blue to y1 and white is connected to w1 my new thermostat has no rc rh or a jumper


Paulette, if your new thermostat has no Rc and Rh thats fine. The Red wire should simply go to the R terminal. The Rc and Rh terminals on the old one was for the old 'two transformer' systems. The vast majority of systems now have no need for the Rc Rh terminal and jumper. The rest of your wires connect as on the old stat also.

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I am wiring a Honeywell wifi unit and I used a separate 24v transformer and connected to the c and rc terminal. My system is ac and heat and uses both and rc and rh wire. I wired the rc to the r ter


A thermostat is a switch. It connects 24vac from one terminal to another depending on the request. The 24vac comes from a transformer, usually located in the furnace and connects to the R terminal. Since you are using RH and RC without a jumper between it means there are two transformers, one in the furnace for heating (RH) and one in the air conditioner condenser used for cooling (RC).
Your old thermostat was probably mechanical and did not have a C (24vac common) terminal. Your new thermostat requires power to operate therefore needs a wire connected to a C terminal. I would get rid of the transformer you added and look for an unused wire in the bunch at the thermostat. If it's there connect it to C on the thermostat and to C on the furnace. Remove any jumper from R to RC or from RH to RC depending on your thermostat and connect wires same as the old thermostat.

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Wiring color to Thermostat Depending on what thermostat youhave and existing wires. Typically red and white are for heat and yellow andgreen are for cooling. On base of thermostat there should be initials stampedto identify wires by color. R. W. Y. G. Possible Rc. and Rh if so for most usesyou need to jumper these two together. You may have a blue wire instead ofyellow or green. If so just hook blue to y or g. Hope this helps you. Thanks.

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1 Answer

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rh is power for cooling terminal and rh is power for heating terminal connect red wire to rc or rh and there should be a jumper between rc and rh if not install one all other wires are color coded correctly. now the blue wire is not used.

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