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    blade2186's Avatar
    blade2186 Posts: 2, Reputation: 1
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    #1

    Jan 7, 2008, 03:53 AM
    Thermostat Change to Digital
    I am trying to change an old Honeywell thermostat for a programmable Horstmann DRT2unit . The old one has 3 wires Red, Blue & Yellow which go into terminals 1,2 & 3 respectively on the 5 terminal block. The Horstmann has 3 terminals NO, COM & NC. Can it be connected to the old wiring and if so how?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 7, 2008, 05:13 AM
    Old Honeywell thermostat model number?
    blade2186's Avatar
    blade2186 Posts: 2, Reputation: 1
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    #3

    Jan 7, 2008, 06:57 AM
    The only number is on inside of cover. EE2 4200 3879-001
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #4

    Jan 7, 2008, 08:07 AM
    That number does not compute. No info available. Sorry
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