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I installed a Intertherm Furnace and A/C unit with a Nordyne Thermostat. The furnace has R,W,G,C Term. The Thermostat has R,W,G,Y Term. What is the proper way to hook the thermostat to the furnace and Condensor.This is for a moble home. This furnace a/c and thermostat was sold together by the Supplier. The way I hooked it up is R,W,G from the furnace to R,W,G on the thermostat. Y from the thermostat to one side of the contactor in the condensor. The other side of the contactor to C on the furnace. The problem is when the furnace is in heat mode. When the thertmostat is satisfied the circ. fan keeps running until the thermostat calls for heat again. It then will stop until there is enough heat for the fan limit. As soon as the fan starts a single flash warning (fan limit open) happens. The fan ends up blowing cold air into the house. This is a new system. Is this thermstat hooked up correctly? If so what is causing the fan limit to open.

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  • deeboy1 May 28, 2011

    O.K. I also want to tell you that when I disconnect the a/c from the furnace C the fan and heat runs fine. The furnace is not closed in, plenty of air. New roof jack. Still think its the board?

  • deeboy1 May 28, 2011

    There is no transformer on the condensor. Also remember there is no Y at the furnace. But Y from the thermostat to the contactor and C from the furnace to the other side of contactor does have 24v across obviously that is what pulls in the contactor. Interrupted by the Thermostat.The condensor is also a Intertherm split system. This system and Thermostat is common in moble homes. The best I can tell is the thermostats are all hooked up the same way. What I dont seem to be able to rap my brain around is why the furnace has no y. These systems are sold as ready. No need for additional relays.There has got to be something wrong with my thermostat hook up. Please Guru. Review my comments from the beginning. Im sure something will click. Im at my wits end.Good luck with the weather there. Im in Chicago and rain and cold has stopped all outside work here too.

  • deeboy1 May 31, 2011

    Thats my point. Disconnecting the wire to c will disconnect the a/c all together. The furnace runs normal then. But we cant keep doing that every time winter comes can we. I have three comments total. Please read them all.

  • deeboy1 May 31, 2011

    Please read all three comments. The brand is in the first sentence. There is no y on the furnace.

  • deeboy1 Jun 01, 2011

    Then how would you complete the circuit y from the thermostat to one side of the contactor on the condensor. The the other side of the contactor to......

  • deeboy1 Jun 01, 2011

    Then tell me how to complete the circuit. Y from thermostat to one side of the contactor on the condensor. The other side of the contactor too......

  • deeboy1 Jun 01, 2011

    Then please tell me how to complete the circuit. Y from the thermostat to one side of the contactor on the condensor. The othe side of the codensor too.....

  • deeboy1 Jun 01, 2011

    Then please tell me how to complete the cicuit. Y from the thermostat to one side of the contactor on the condensor. The other side of the contactor too....

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The C on the furnace is an Optional terminal, and is meant to be a low voltage wire, just like terminal Y. Disconnect the wire from the furnace terminal C and you should be fine.

Posted on May 28, 2011

  • Jeremy Moore
    Jeremy Moore May 31, 2011

    I know there is no terminal Y on the furnace, it is terminal C that is on the furnace, and doesn't need to be connected.

  • Jeremy Moore
    Jeremy Moore Jun 01, 2011

    Have you looked on the blower motor access panel or other access panels for the wiring diagrams? They are posted there on every unit. Also, refer to this wiring diagram:http://www.smarthome.com/images/30570sid... Set the thermostat for cooling and check for 24V between terminals "r" to "y", if you don't see 24 volts there may be a problem with your control wiring/board, if you see 24v then there may be a break in the 2 wires going to the outdoor unit.

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What is the brand of the furnace? The wires should go, Red to R, W to White, G to Green and Y to Yellow.

Posted on May 28, 2011

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Hi,
You have wired the system correctly...your problem is not with the wiring...
It sounds to me as though the problem is a bad circuit board...that happens...
However... check that you have enough air flow... if you do not have enough air moving through that system then it will do that also... and you will then have problems on cooling with the unit freezing up when it gets warm enough for that... so you need to get it corrected now...

Make sure all vents are open and then the furnace can get air into the closet if you have it in a closet...
You should have at least one vent for every 5-800 BTU of furnace output... and of course big enough ductwork for proper air flow...

heatman101

Posted on May 28, 2011

  • D. Floyd Kolb
    D. Floyd Kolb May 28, 2011

    Whoa.... in that case... it would seem as though you are getting feed back on that wire from the condenser...You should have no power on that "C" terminal to ground either at the furnace or coming back from the condenser...

    From what you are telling me now it seems that there is a problem with the outdoor condenser, or the outdoor unit has it's own transformer and the two are not in sync. If that is the case then an isolation relay may be needed to separate the two pieces...

    Twist the two wires from the condenser together and see if it starts... is so then that is what is needed...get a 24v relay... run the Y and C from the furnace to the coil and then run the two wires from the condenser to the NO terminals on the relay

    You did not or I have missed seeing what condenser you are using....so it's hard for me to tell...
    I will be i and out today... Live in PA and am still trying to get flowers and gardening done....have not done a thing yet this year because of our crazy weather...but I will check in here as I can...(when I can sneak away from my wife) :-)

    heatman101

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