Question about Honeywell Programmable Thermostat Heater

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Wiring honeywell digital stat

I have just brought a new honeywell digital thermostat T6620B1008(DT200) and i am having trouble wiring it up.
all i have on the new stat is A.B.C.conections
I HAVE 3 WIRES RED BLUE AND YELLOW WITH A RED COLLAR ON THE YELLOW CAN YOU HELP ??????
CHEERS DAVE

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  • Anonymous Dec 24, 2008

    yes same problem. not good diagram on diag e; what is "M" thanks jon

  • Anonymous Dec 24, 2008

    yea same prob diag 'e' what is 'M'

  • indpls42 Dec 25, 2008

    im having hard time connecting honeywell pro th 4000. old stat was a sc 2200 with emergency switch.. hw has no emergency sw.it heats but blower doesnt turn off and no cool air.. ty

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Hello davem1952,
The way you wire it will depend on how the other end of your three wires are wired into your heating system. This link http://www51.honeywell.com/pacific/common/documents/DT200_Specifications.pdf
shows the various methods for wiring it and take into account the type of setup you are dealing with. You'll need to find the wiring detail ( last page) that corresponds to your setup..
Hope this helps..
Reagrds,
Rick

Posted on Dec 13, 2008

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