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Can I connect the heat only to a heat and cool thermostat?

Can I use this thermostat for heat only?

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Yes you can. Red wire goes to r, white wire goes to w, green wire to g. if the heater is gas then make sure there is not a jumper wire from RH to RW if so remove it. If electric heat then leave it. Some thermostats wont have this jumper but there will be a switch on them to switch to either gas or electric heat.

Posted on Nov 19, 2014

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I have a ComfortMaker SoftSound 1000+ model CAC036akc4. Is this a heat pump model. I'm trying to install a nest thermostat and can't get it to work.


The model number you provided is for a 3 ton a/c only. Not a heat pump.

If you are installing a digital thermostat, the problem may be in the configuration menu. It will have to be told what system you are asking it to control....1 stage heat and 1 stage cool would be the standard residential hvac system.

Make sure there is a jumper between the terminals Rc and Rh to make sure both heating and cooling cycles will work. There should be a dip switch on the sub base to select either electric heat or gas heat. Verify all your wiring connections are correct. Thermostat connections: Rh terminal is 24v power for the heat cycle. Rc is the 24v power for the cool cycle. W terminal is the heat connection. G terminal is the fan control connection. Y1 is the a/c connection. If you have a "C" connection, that is the 24v common connection that should be connected to the control transformers common connection in the furnace.

Dec 29, 2014 | Heating & Cooling

1 Answer

I am upgrading an analog thermostat to the dometic 3313189 thermostat. My question - how will i connect the present 6 wire to the new 3 wire


Do have AC? if you do you have to by a thermostat that can handle both heating and cooling, if you only have 3 terminals it must be a heat only thermostat.

Nov 17, 2014 | Dometic 3313189.031 3313189.072 Black...

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I paid $20 last night to talk to someone. He told me how to hook up the Lux DMH110 but when i hooked it up this morning the heater came on when i put it on COOL and the fan just come on when i put it on...


If you have this type of system your thermostat will not work;
  • Multi-Stage Heat Pumps
  • 3 Wire Hydronic Systems
  • Line Voltage Systems (120/240 VAC)

  • This thermostat is only for this type of HVAC systems;
  • Most 24V Heating and A/C Systems
  • 1 Stage Heat/1 Stage Cool: Gas, Oil, Electric, or Single Stage Heat Pump Systems
  • 2 Wire Heat Only Hydronic Systems (Hot Water Baseboard & Radiator)
  • Millivolt Systems (Wall Heaters / Furnaces & Gas Fireplaces)

    1. Never connect a low voltage thermostat to line voltage.
    Two wires control a heat only system.
    1. Connect one wire to W and the other to RH.
    Two wires control a cool only system.
    1. Connect one wire to RC and the other to Y.
    Three wires for forced air heat only system, where the previous thermostat
    did not have a clock or timer.
    1. The previous RH or RC wire is the 24-volt transformer wire. Connect it to RH. Leave jumper connecting RH to RC. Connect the forced air heat system to W, and the fan wire to G.
    Three wires for a heat only, forced
    water system that did NOT have a
    clock or timer.
    1. This system employ 3 wire zone valves. Currently no Lux controls are compatible with this system.
    Three wires control a heat only, forced water system that DID have a clock or timer.
    1. Tape off and do NOT install any clock or timer wire. Often they are labeled C or TC. Install the remaining two wires, one to RH and the other to W.
    Four wires control a heat only system,
    and two of the wires operate clock or timer. The other two wires operate the heater.
    1. Tape off and do NOT install any clock or timer wire. Often they are labeled C or TC. Install the remaining two wires, one to RH and the other to W. The jumper connecting RH to RC may remain or be removed.
    Two wires control heating AND cooling.
    1. Currently no Lux controls are compatible with this system.
    Three wires control heating and cooling. One wire operates heat, one operates cooling and the third provides 24 VAC.
    1. Connect the 24-volt power wire to RH. Install a jumper connecting RH to RC. This jumper is usually pre-wired. connect the heat wire to W, and the cooling wire to Y.
    Three wires control a cooling only system. One wire operates the compressor, one operates the fan and the third provides
    24 VAC.
    1. Connect the 24-volt power wire to RC. Connect the cooling wire to Y and the fan wire to G.
    Four wires control a heating and cooling, electric, gas or oil, forced air system that
    is NOT a heat pump.
    1. Connect the 24 VAC transformer wire to RH or RC. Install a jumper connecting RH to RC This jumper is often prewired. Connect the heat wire to W, the cooling wire to Y. and the fan wire to G.
    Four wires control a Single Stage Heat Pump. They were labeled: G, Y, R or
    RH or RC, With either B or was used.
    1. Do not connect wires to both B and O. Connect the reversing valve wire to B or O, just as the previous thermostat. Install a jumper wire from RH to RC. Connect 24 VAC wire to RH too. Install a second jumper wire from W to Y. Connect compressor wire to Y and the fan wire to G.
    More than 4 wires are connected to the
    old thermostat

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    A/C does not cool like it used to, unit runs


    sound like your system is under sized. for every 400 sq ft of living space you should have a ton of ac or 12000 btus. also check and see if your attic fan is working. any drafty windows or doors. your supply temp should be at least 20 deg colder then your return temp. also check your filter should be changed every three months this will help with air flow.

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    1 Answer

    I have a honeywell thermostat model # th5220d1003-0636 & need to know what connections to make for gas forced air heat.


    This is a Focus Pro 2 heat,2 cool thermostat. If you are connecting this to a single stage(1 heat) residential furnace then your connections are: At the thermostat the R and Rc therminals are internally connected so you can connect your R terminal wire from the furnace to the R terminal at the thermostat(this is your 24 volt supply for both heating and cooling. The W or W1 wire (heating) from your furnace you connect to the W1 terminal at the thermostat. The W2 wire from your furnace(if your furnace is a 2 stage furnace) you connect to the W2 terminal at the thermostat. The G wire from your furnace(indoor fan) you connect to the G terminal at the thermostat. The Y1 wire(cooling) from your furnace you connect to the Y1 terminal at the thermostat. The C wire(common or neutral) from the furnace you connect to the C terminal at the thermostat.

    Nov 14, 2009 | Honeywell Programmable Thermostat Heater

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    I am trying to install a Honeywell programmable thermostat and am having trouble with the instructions. The old thermostat connections are identified by wire color, six of them, W, O, G, R, C, Y, but the...


    It sounds like you have a heat pump, o (orange) is usually used to power a reversing valve in your outdoor unit for cooling. But just in case you don't here is a little info Rh-power for the heating circuit, W- completes heating circuit, Y to your outdoor unit for cooling, Rc- power for the cooling circuit, and G power to your high speed fan.

    O for your heatpump
    C is 24v common for cooling circuit
    If you do have a heat pump, you will have to get a thermostat that is compatable with heat pumps. Hope this helps

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    1 Answer

    Honeywell RTH2310 heating while it's supposed to be cooling


    ok to start with if you have a heat pump and not ac over electric heat depending on type but most will be wired as
    red to r jumped to rc y to yellow this turns on compressor g to green this turns on fan w to white or brown for electric heat strip or em heat o to orange reversing valve energised in cooling switches from heat to cool or orange to b energised in heating c blue for common
    you will have to look at your indoor unit and out door unit to verify what collors the contractor used when they wired it up hope this helps

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    Honeywell Thermostat


    Make sure G from indoor unit goes to G on thermostat for fan continous fan, if that doesn't work and you have 24 volts to R and C then the t'stat is bad.
    For 2nd stage heat or aux.heat, on the indoor unit you need to make sure the wire W2 from the indoor unit goes to W2 on t'stat.
    You don't need any wires from W1on the indoor unit to W1 at the t'stat because with a York heat pump Y1 is the contactor which turns the compressor on and you will get 1st stage heat, and for cooling the t'stat will also bring on O which is the (reversing valve) or cooling changeover relay for the cooling mode.
    C = common usually black wire
    R = hot usually red wire
    Y or Y1 = contactor
    W1 = 1st stage heat not needed for heat pump
    W2 = Aux. heat indoor heat
    G = fan
    O = Cooling changeover relay
    B = Heating changeover relay
    L = System monitor
    E = Emergency heat relay

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    What color wire is connected to the "Y" terminal on the thermostat.
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