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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a 13 year old Mastercool Evaporative Cooler. The thermostat

Customer Question

I have a 13 year old Mastercool Evaporative Cooler. The thermostat has finally given out. I bought a new thermo but of course the colors arent the same. Can you tell me which color wire operate 1) Fan High 2)Fan Low 3)Pump? The colors for the wiring are red, blue.yellow, green and white which was not used. The colors for the new thermo are orange (fan hi) yellow (fan lo) Violet (pump) Red (Active) and White (neutral).
JA: I'll do all I can to help. Is there anything else the HVAC Technician should be aware of?
Customer: The new thermo is an Ez Stat Power
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the HVAC Technician about your situation and then connect you two.
Submitted: 1 year ago.
Category: HVAC
Expert:  bonzaco replied 1 year ago.
Can you give me the part number of the part supplied and if you can the model number of your cooler - Ian
Customer: replied 1 year ago.
There is no part number on the EZ Stat but the name is***** for Two Speed Evaporative Cooler Control. I do not have the model number anymore of the MasterCool 2 speed Evap Cooler.
Customer: replied 1 year ago.
No link on the email you sent worked.
Customer: replied 1 year ago.
Are you there??
Customer: replied 1 year ago.
Expert:  bonzaco replied 1 year ago.
Yes I am still looking into it but you havent given me much to go on so am having to do abit of research before I give you a response. Did you keep a note of the original connections to the thermostat?
Customer: replied 1 year ago.
The colors that I stated in the original question: Red, Yellow, Green, Blue and White(not used) come from the cooler. What each color does is what I am trying to find out so I can connect the new thermo.
Customer: replied 1 year ago.
Ok I had to go up on the roof to get the model #. Not a great idea at 79 yrs. Mastercool Plus Model # *****
Expert:  bonzaco replied 1 year ago.
From that I assume that you did not take note of the original connections? Am I to understand that the new thermostat is a Dial 7625 model?
Customer: replied 1 year ago.
It is 7621.
Expert:  bonzaco replied 1 year ago.
OK I'm afraid you are going to have to leave this with me for a while as your model wasn't actually made by Mastercool at all but by a company called Essick Air in Little Rock AR - their switchboard has just advised that no-one is available to speak to in their technical department currently so I will try them later and come back to you.
Customer: replied 1 year ago.
Will that be by email?
Expert:  bonzaco replied 1 year ago.
No I will try and catch them before they close today if anyone is available later.
Expert:  bonzaco replied 1 year ago.
I am still waiting for a response from Essick but in the meantime could you try and help a little further. I need your to tell me which wires go to firstly the pump and secondly the two speed fan by their color codes.
Customer: replied 1 year ago.
I talked to John at Dial (EziStat thermo). He said I had the wrong thermo...that I need a LOW VOLTAGE THERMOSTAT. A LOW VOLTAGE will work with my existing wiring. I ordered one from Grainger this morning.
Customer: replied 1 year ago.
I wish I knew the color codes. My best guess is green..pump, red low hi fan.
Expert:  bonzaco replied 1 year ago.
You might wish to look at this before you try and fit the new one -
Customer: replied 1 year ago.
Where would you suggest I look for the color codes?
Customer: replied 1 year ago.
That like the one I had is NOT a low voltage thermostat.
Customer: replied 1 year ago.
At this point I think we are wasting each other's time. Over & out.

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