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Heat Pump I have a intertherm heat pump , compreser working , fan on outside working , thermostat calling for cooling , large line from compreser to inside coil sweating and cold and still no cool air ??/

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Your inside cooling coil in the air conditioning mode could be frozen over. Change the fan setting to on and operate it that way when in the cooling mode. Turn the air conditioning OFF with the fan ON to clear the coil of frost which should take about 1 hour.

The fact that you have sweat on the large line means that the temperature of the gas inside the line is below the due point of the moisture in the air. A good tech would measure the pressures and temperature of the system to get what is called superheat to determine proper system charge of refrigerant.

Posted on Jun 14, 2008

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Posted on Jan 02, 2017

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Why does lenox heat pump not heat in normal heat mode?


The thermostat is not a heat pump thermostat or it is not wired or set up correctly.

Feb 05, 2015 | Heating & Cooling

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Hey, I purchased your Honeywell RTH2510 Thermostat, but I didn't even think to label the wires when I took the old thermostat off. Upon installation of the new Thermostat (2510) the Air Conditioning...


The connections that you really need to reference would be at the air handler itself. That would tell you which wires go outside to the heat pump and which wires go to the air handler. I can however give you some basics that may help.

Heat Pump Wiring
Terminals/Colors/Function
R- Red- 24v power supply. (Usually a jumper between RC/RH)
G- Green- Fan
W- White- Heat (Sometimes W1-W2, first or second stage heat)
Y- Yellow- Cooling (Same applies as above i.e. Y1-Y2)
C- Common (Most people use blue unless it is used for B terminal and sometimes cooling on older 4 wire systems.
B/O- Reversing Valve for heat pump. Either powered heating or powered cooling, depending on system installed.
Aux- Also used for heat.

Note: Considering that the installer had their own way to run all wires, use different wires, connections, etc. This is just a reference to common wiring in the field.

How the most common system is hooked up:
Thermostat:
Red wire goes to R terminal
Yellow wire goes to Y1 or Y2 terminal
Green wire goes to G terminal
White wire usually goes to W1 or W2 terminal
Orange or Black wire goes to B/O terminal
Brown wire usually goes to Aux terminal
Blue wire goes to C terminal, unless its being used as stated above.

This is without using a fossil fuel kit or zone control board.

Where do they go from the thermostat?
Red
goes to the air handler transformer or board and goes outside to heat pump to power low voltage controls.
Yellow wire goes straight outside to Y terminals on heat pump unless going to a board inside first.
Green goes to the air handler fan relay.
Common goes to the air handler and outside to heat pump.
Black or Orange will go outside to heat pump terminals for reversing valve.
White usually goes outside to heat pump,and inside to air handler. Will explain reason further down.
Brown will go to the air handler to the heat relay for the emergency heat.

On a call for heat, with a powered cooling system (more common).
The R, Y, and G terminals energize, sending a signal to start the blower and pull in the contactor outside. Note that the Y terminal is usually cooling, but since this is a powered cooling system, the reversing valve is not energized, causing the system to run in heat mode. If you have powered heating, the reversing valve terminal will energize also. Depending on thermostat, if you set the temp substantially higher than room temp, it may kick on the emergency/aux heat to quickly raise the room temp. On a call for emergency/aux heat, the R, G, and E/Aux terminals are energized, turning on the electric/gas heat instead of the heat pump. This comes in handy since the heat pump can only pull so much heat from outside before its not enough to properly warm the house, usually around 30 degrees outside temp. If you are running the heat pump and the system goes into "defrost", the outside unit will send a signal back to the air handler, through the white wire I mentioned earlier, to tell the emergency/aux heat to come on while it is in defrost mode, providing heat whenever needed.

Again, this is just a reference guide to some basic wiring, but hopefully it will tell you where the problem is or at the least, give you a good start. There are variables in which things can change the wiring like a zoning system or fossil fuel kit. Even then, you should be able to get pretty close. Hope this helps and Happy Holidays!

Dec 07, 2013 | Honeywell Programmable Thermostat Heater

1 Answer

On a westinghouse heat pump when does the big fan turn on


The outside fan should come on whenever the thermostat calls for heat or cool. If the compressor is humming but the fan is not turning check the capacitor first - usually a 35/5 330 volt

Oct 17, 2012 | Cars & Trucks

1 Answer

I installed a Honeywell RTH230B model thermostat. The heat works fine, but the AC is blowing warm air. Wires from old system are as follows: Y=yellow; G=green; R=red; O=brown; C=blue; E=white (it looked...


the colors of old system are for heat pump.if you have a heat pump you need heat pump thurmostat and colrs will make more sense.if not,then you need to go into furnace to see what colors go where.yellow is cool, goes to compressor contactor,usually another wire going from furnace to outside unit.green is fan relay rh is heat call rc is cool call

Jan 01, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

I have a older Intertherm heat pump that has quit heating but still cools alright does anyone have any suggestions what could be wrong??


Check your reversing valve, When you set your thermostat for heat the reversing valve circulates the heated freon through the air handler instead of the cooled freon. The valve is called many things but it reverses the flow of freon See http://www.google.com/images?hl=&q=heat+pump+schematic&rlz=1B3GGGL_enUS329US330&um=1&ie=UTF-8&source=univ&ei=npcOTfLEPMO88ga4poDGBQ&sa=X&oi=image_result_group&ct=title&resnum=2&ved=0CC4QsAQwAQ&biw=1024&bih=576 and look at the different schematics

Dec 19, 2010 | Intertherm P3RA-036K Air Conditioner

1 Answer

Intertherm heatpump outside fan will not come on, replace fan motor and capacitor, fan will not come on what could it be


some times heat pumps have a fan cycling switch to keep the head pressure normal in cool weather or check the defrost relay for the fan when a heat pump condenser gets frosted it will stop the fan and reverse into cooling mode for a few min. to melt the ice and this function is done by a relay or a printed circuit board if it goes bad you wont have voltage to the fan

Sep 30, 2010 | Intertherm P3RA-060K Air Conditioner

1 Answer

My cooling and heat pump quit working and the fan outside does not come on. If you push in the contactor in the fan comes on and sounds like the compasator does to.


Check the voltage at the contactor where the 24 vac connects to the coil for the contactor so you can see if it is making it that far. It will be 2 smaller wires that are not connected to the 240 vac. Let me know if you have 24 vac there. The thermostat will have to be calling for air for the 24 vac to be present. let me know what you find.

May 05, 2010 | Intertherm P3RA-060K Air Conditioner

1 Answer

Intertherm Heat Pump


Some of the old heat pumps made the reversing valve in the heating mode. On your new thermostat the orange wire will need to be on the B terminal. If it was color coded? I hope you made notes of how it was.

Jan 05, 2010 | Heating & Cooling

3 Answers

Intertherm heat pump


FIRST YOUR OUTSIDE UNIT PROVIDES HEAT BY USING A REVERSING VALVE TO CHANGE THE REFRIGERANT FLOW.THERE IS NO HEAT STRIPS OUTSIDE SECOND YOUR EMERGENCY HEAT TURNS ON ELECTRIC ELEMENTS INSIDE YOUR AIRHANDLER UNIT.IT SOUNDS LIKE SOMEONE HAS WIRED YOUR UNIT WRONG OR HAS THE THERMOSTAT SET IMPROPERLY.WHEN THE HEAT PUMP CANNOT SATTISFY THE SETPOINT THE THERMOSTAT IS SUPPOSED TO TURN ON YOUR ELEC. HEAT UNTILL THE LOAD HAS BEEN REACHED AND THE HEAT PUMP CAN CONTINUE TO MAINTAIN IT.

Nov 28, 2007 | Heating & Cooling

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