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    formman514's Avatar
    formman514 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Oct 18, 2007, 05:27 AM
    Themostat replacement
    I am replacing old line voltage thermostats and want to use Honeywell digital programmable units.

    My current configuration is 2 wire but new thermostats are 4 wire. This is a 240V system with multiple heaters in parallel.

    Can I use the new thermostats and how do I wire them if I can use them?

    Thanks,

    JR
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 18, 2007, 04:03 PM
    Model numbers?
    formman514's Avatar
    formman514 Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Oct 18, 2007, 04:42 PM
    Quote Originally Posted by hvac1000
    Model numbers?
    Honeywell Digital LineVoltPro™ 8000 TL8230A1003

    The spec sheet says it is a 4 wire stat
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
    Uber Member
    		  
    #4

    Oct 18, 2007, 04:54 PM
    Does the thermostat box have 2 pair of wires in it, one from the breaker box, and one to the heaters? If so, easy enough. If 2 of the terminals are marked line, connect the pair from the breaker to the line terminals, and the pair to the heaters to the load terminals.

    If you only have 2 wires, connect one to the line, and the other to the matching load terminal. I am not sure that meets current codes, but may be allowed as a retrofit. It will be just as safe as the old one was. The 4 wire system is safer, and I hope somebody is able to clarify the code issue.
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