Programable 3 Stage Cooling Thermostat... Is There Such A Thing???? - HVAC - DIY Chatroom Home Improvement Forum


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Old 04-10-2012, 04:10 PM   #1
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programable 3 stage cooling thermostat... is there such a thing????


I am re working the Evaporative cooler on my house. The system has a pump and a two speed fan. I would like to add a programable thermostat.

so the idea is to use a 3 stage cool thermostat. upon a call for cooling, stage 1 would turn on the pump for x number of minutes. Then if the cooling call had not been satisfied (of course if would never be with the pump only running, but this would pre-wet the pads),stage 2 would turn the system on low speed fan for x number of minutes, unless the call for cooling was not satisfied and finally, the 3 stage would run the fan on high until the call for cool was satisfied..... I can do the 24 volt systems and the relays,,, I just cant seem to find a three stage cool thermostat!!!!!!!!!!!!!

any body have any ideas????

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Old 04-10-2012, 06:18 PM   #2
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programable 3 stage cooling thermostat... is there such a thing????


I'd just use a standard 2 stage cooling thermostat, and put a delay on make timer in to delay the low speed fan from coming on for X minutes.

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Old 04-10-2012, 07:22 PM   #3
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programable 3 stage cooling thermostat... is there such a thing????


had not thought of that.... delay relay.. ive seen them, but never used them!!!! thats a great idea!!!!!! thank you!!!!!!!!
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Old 06-20-2012, 10:15 AM   #4
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programable 3 stage cooling thermostat... is there such a thing????


I just completed the rework of my evaporative cooler controls. It works great!!!!

order of operations

call for cool (stage 1 via thermostate)
pump turns on for 3 minutes, fan motor is delayed via an adjustable 24v solid state delay.
after 3 minutes, the fan turns on to low speed
after 15 minutes, if call for cool is not satisfied, fan switches to high speed.


and let me tell you, it works great!!!!!!!!!!!!!!! someone somewhere should be building this (you can get a white rodgers control, but really only delays the fan)....
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