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

    Dec 3, 2008, 02:25 PM
    Suggest Thermostat for Hot Water Boiler system
    I am having a devel of a time finding a replacement thermostats for my Hydronic system.

    I have tried a couple and they do not wire up correctly, even though they say for "Hot Water systems" they are for 2 wire and I have a 3 wire system.

    OK, I have a Lochinvar Knight high efficiency boiler with 6 zone valves.
    The zone valves are: White-Rodgers Type 1311-102

    I want to replace my old murcury thermostat with non programmable digital ones.

    The zones take three wires:
    4 and 6 to open valves
    5 and 6 to close valves.

    Don't need anything fancy - just something simple and hopefully not expensive and something I coule get at the big box store.

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

    Dec 3, 2008, 04:53 PM
    1311 COMPATIBLE THERMOSTATS TABLE These are all White Rodgers thermostats.

    Model Number Programming Options Contacts Profile Terminals
    1E35-910 Non-Programmable Sealed Mercury Cell Vertical 4, 5, 6
    1F35-910 Non-Programmable Sealed Mercury Cell Horizontal 4, R5, Y6
    1F90-371 5+1+1, 5+2 Electronic Horizontal RC, RH, W, Y, G, MV, O, B, +, S, -, 6
    1F96-344 Non-Programmable Electronic Horizontal RC, RH, W, Y, G, MV, O, B, +, S, -, 6
    1F97-371 7-Day Electronic Horizontal RC, RH, W, Y, G, MV, O, B, +, S, -, 6
    1F95-1277 Touch Screen 7-Day, 5+1+1, or Non-Programmable Electronic Horizontal RC, RH, C, W/E, W2, Y, Y2, G, O, B, 6, L, +, S, -
    1F97-1277 Touch Screen 7-Day, 5+1+1, or Non-Programmable Electronic Horizontal RC, RH, C, W, Y, G, O, B, W/E, L, 6, +, S, -
    1F97-391 7-Day Electronic Horizontal RC, RH, W, Y, G, 6, HM1, HM2, S1, S2, S3
    1F80-0471 5+1+1, 5+2, or Non-Programmable Electronic Horizontal RC, RH, C, W, Y, G, O/B
    1F86-0471 Non-Programmable Electronic Horizontal RC, RH, C, W, Y, O/B
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
     
    #3

    Dec 3, 2008, 05:16 PM

    Are you set on digital. Or would you be happy with any thermostat without mercury. Honeywell makes a great heat only (looks almost exactly like the old t87) themostat.
    George M's Avatar
    George M Posts: 2, Reputation: 1
    New Member
     
    #4

    Dec 3, 2008, 05:25 PM
    Thanks,

    I'll look into these.

    George M

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