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    davedd's Avatar
    davedd Posts: 3, Reputation: 1
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    #1

    Sep 21, 2007, 12:53 PM
    Thermostst Wiring
    I have a 20 year old Honeywell Chronotherm thermostat which I am planning to replace with a Honeywell TH8321. I need help in wiring.

    Currently I have wires connected to G, W2, X, O, Y and R in the current Chronotherm. I understand the relevant connectors in the TH8321 are Y, G, O/B, R, C and AUX. Am I correct about the relevant TH8321 connectors and if so, which will be the corresponding terminals to connect? Any other tips or do's/don'ts.

    I have a Lennox HeatPump with auxiliary gas heating.

    Thanks.

    Dave
    acetc's Avatar
    acetc Posts: 1,004, Reputation: 79
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    #2

    Sep 21, 2007, 05:44 PM
    R to R, G to G, Y to Y, O to O, W2 to Aux. X to C, Good luck, Mike
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
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    #3

    Sep 21, 2007, 05:52 PM
    Quote Originally Posted by davedd
    I have a 20 year old Honeywell Chronotherm thermostat which I am planning to replace with a Honeywell TH8321. I need help in wiring.

    Currently I have wires connected to G, W2, X, O, Y and R in the current Chronotherm. I understand the relevant connectors in the TH8321 are Y, G, O/B, R, C and AUX. Am I correct about the relevant TH8321 connectors and if so, which will be the corresponding terminals to connect? Any other tips or do's/don'ts.

    I have a Lennox HeatPump with auxiliary gas heating.

    Thanks.

    Dave
    Turn the power off first going to fan coil unit so you don't blow a transformer. The wires will hook up the same. Except W2 will go to Aux and X to C on the new t-stat. Make sure the new t-stat is set up to energize the reversing valve in the cooling mode( O/B). Good luck.
    davedd's Avatar
    davedd Posts: 3, Reputation: 1
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    #4

    Sep 22, 2007, 07:18 AM
    Thanks a million.

    I have a couple of additional queries.

    1. I have a second heatpump upstairs, but without auxiliary heat. I intend replacing chronotherm with TH8321 here also. I guess the same connection translation applies. Please confirm.

    2. I heard from a guy here that chronotherm w2 wire should be connected to AUX and E (through jumper cable). Is that correct? If so what kind of jumper cable should I use.

    Again very many thanks for all your help.

    Dave
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
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    #5

    Sep 22, 2007, 07:23 PM
    Quote Originally Posted by davedd
    Thanks a million.

    I have a couple of additional queries.

    1. I have a second heatpump upstairs, but without auxiliary heat. I intend replacing chronotherm with TH8321 here also. I guess the same connection translation applies. Please confirm.

    2. I heard from a guy here that chronotherm w2 wire should be connected to AUX and E (through jumper cable). Is that correct? If so what kind of jumper cable should I use.

    Again very many thanks for all your help.

    Dave
    Yes the same way. If you have the aux and E terminal you will need to jumper. Just use some of your 18 gage thermostat wire
    davedd's Avatar
    davedd Posts: 3, Reputation: 1
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    #6

    Sep 24, 2007, 07:30 AM
    Wonderful. It is done. Thanks very much.

    Dave
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