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    agroleau1's Avatar
    agroleau1 Posts: 1, Reputation: 1
    New Member
     
    #1

    Dec 7, 2009, 08:48 AM
    3 wire thermostat install, heating only, boiler, with automag valves
    I am trying to hook up a 3 wire (red,green, and white) thermostat. The old thermostat was an automag mercury type that says r+b heat only. All three wires where hooked up. I installed and now my heat will not shut off upstairs. I have 4 zones. I used same thermostat downstairs. Seems to be working fine. I have red to rb jumped to rc, green to w and white to y.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
     
    #2

    Dec 7, 2009, 09:06 AM
    You have a old Automag zone control system. See the Automag company below.

    You can add there relay or similar to make your 3 wire zone valve work.

    CNV84 Relay
    Relay to adapt existing 3-wire thermostat system to 2-wire thermostats. (One relay required for each thermostat.)

    OR you can just replace the valve head (I recommend this instead of a relay)

    Call them. They have been around a long time and are very knowledgeable. Many years ago I installed a bunch of there stuff on contract jobs for the US Government.

    Automag division of KCI Industries, Inc.
    Manufacturer of "Fail-Safe" normally open Zone Valves

    1111 Hill Street, Jessup, PA 18434
    (800) 451-2002
    (570) 383-2428
    FAX: (570) 383-9820

    Web site loaded with info.

    AUTOMAG

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