Question about Mastercool 67680 Evaporative Cooler Air Conditioner

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Wires don't match from wall to the new thermastat

I have an older model mastercool so old in fact the serial number and model numbers have long since faded... It only has 4 wires that come out to wire up to the thermastat. Red, Yellow, Green and White. The problem is I can't figure on which is Power, Fan, Pump and whatever....? is there anything that can be done short of calling out the repair guy?

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  • begiese1412 May 11, 2010

    Solution 1 appears to be for a standard heating thermostat not a mastercool unit. Have you checked the screws on the new thermostat to see if they arte color coded? The closest I've seen is
    Y - fan
    W - pump
    R - 24v pwr
    G - common
    B - drain
    Most local parts counter men will let you look at a new one to see if it has a diagram in the box.


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Red power
yellow ac
green fan
white heat

Posted on Apr 21, 2009

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Posted on Jan 02, 2017

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