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I am changing out my intertherm thermostat control. the blue wire is hooked up on B, not on RC, can you tell me why

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Because it doesn't belong on RC.

B means "blower" in the antique language of the tradesmen, but nowadays it means "reversing valve". RC means "red cool" or "put 24 volts here to power the cooling system".

The blue wire was not connected to RC because it would not bring 24 volts to the RC terminal.

Posted on Jul 24, 2008

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How to wire a therostat


You should have 4 wires, Red, Green, White, Yellow
On your thermostat just match up the Red to R, Green to G, White to W, Yellow to Y. sometimes the Yellow is blue instead. so Blue to Y.

If you have these four you are set.
Now some t-stats have Rc and Rh, If yours does put the Red to either one and add a small wire to connect the Rc to the Rh (jumper wire) this just tells the t-stat to use one power source for the A/C and Heat. No big deal. But if you don't jumper it you will only have A/C on Rc and Heat on the Rh depending where you put the Red wire.

If you have other colors just look in your furnace and see what colors are hooked to R,G,W,Y and do the same at the Thermostat. Good luck

Feb 15, 2011 | Honeywell Heating & Cooling

1 Answer

Intertherm has wiring of E,O,G,R,C,Y,W all have wires to them and changing to honeywell it has Rh,Rc,W,Y,G Where do all the wires go?


If you haven"t solved it by now, with the new stat you will not use the O or B terminals. Your red wire will connect at either one, RH, or RC as they are connected together with a jumper wire. Then, G to green, W to white, and Y to yellow. Now, if this is a heat pump, you have the wrong thermostat. The one you have is for a gas fired unit. The O and B terminals are used on a heat pump to shift the reversing valve. So, if you have a gas unit, I believe it is, wire it like I said. Red will go to both RH and RC as one. Please rate me on my help.
Shastalaker7
A/C, & Heating Contractor

Jan 12, 2011 | Intertherm P3RA-048K Air Conditioner

1 Answer

I bought a honerwell regular digital thermostat and changed it trying to follow directions the 4 (four) wires coming out ofn wall and that were connected to old thermo were red, black, yellow and white. ...


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.

Jan 05, 2011 | Heating & Cooling

1 Answer

Have an Intertherm thermostate in mobile home controlling gas hearing and elec ac. Blue wire to thermostat connects to the "A" terminal on the thermostat...Blue wire goes to a terminal on the...


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1 Answer

Intertherm 13 SEER split air conditioner fans wont turn on?


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1 Answer

I have a travel trailer with a roof top a/c colman mach111 and I hooked up a thermostate digital. The heat works but cant get a/c to come on. the termanials on hunter thermostate are G W Y RC RH


OK, the wiring that you should have in your RV is as follows: Red White Blue Yellow Green Gray.

This Thermostat will not work on this Air conditioner because the tstat you are installing is a 24V thermostat. The connections are as follows G = Fan, W = White, Y = Cooling, RC = 24V Cool, RH = 24V. The only thing that I can think to do is hook it up like so.

On the G Terminal, Hook up the Green wire from the wall. On W, hook up the White wire, Y, hook up the yellow wire. RC = run a jumper from the RH terminal, RH = hook up the red wire. If this doesn't work then you will have to go back with the coleman thermostat.

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1 Answer

I have 2 seperate controls ,1 for heat the old honeywell round turn styls and then i bought a new digital thermostat ritetemp and i have 3 wires for the airconditioner white,red and green, i just cant...


on the round its r g w hook that on the new stat if your using it for heat to then the rh and w are heat controlling baseboard or a boiler relay? the new stat has a jumper wire remove that it is hooked up to rh and rc un plug every thing good luck Tom

Jul 03, 2009 | Intertherm P3RA-048K Air Conditioner

1 Answer

Fan Only Won't Work


I jumped the rc and rh wires in the therostat box and now have fan only when selected.

Jul 01, 2008 | Heating & Cooling

2 Answers

Reset Button


There is no reset button on most of these units. If nothing is running at all when a call from cooling from the thermostat is made your problem could be a tripped or breaker in the off position. When you turn the thermostat to cool have someone listen for a click at the unit. If no click is heard it may be in the low voltage circuit that your problem is. If a click is heard which is the main contactor pulling in to run then your problem may be in the high voltage power supply. If you have a fused disconnect check the fuses. They should be of the time delay type (slow blow) and sized according to the ampacity on the unit name plate. Also check the main breaker in the house power panel.

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1 Answer

Intertherm to Honeywell thermostat


Typically if you have a yellow wire in the "y" terminal blue is used as common or "c". As far as your jumper from rc to rh, that will depend upon what type of heat you have. If all of your heat and cooling come from your packaged unit outside, yes you will need the jumper. If this does not work maybe you have a bad breaker or transfomer.

Oct 12, 2007 | Intertherm P3RA-048K Air Conditioner

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