How do I debug/diagnose/fix my swamp cooler fan, that won't turn on seemingly? The pump runs OK but the motor, nothing.
How to fix swamp cooler whose fan won’t turn on
evaporative-cooling
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That looks like an Adobe P2-911 plug and it is proprietary. There's another version Adobe made (I believe it's for the 230v motors) that has a 5th round pin. The flat bladed terminal is for keying the connector so it can't be plugged in upside down. You should have a 115v cord with 2 hots - one for high speed and one for low speed, 1 neutral, and 1 ground.
Yes, it is easy to control a swamp cooler with any thermostat. The problem is that in order to use a swamp cooler effectively, you need strategic openings (typically open windows) to let the air out. This is the part which is hard to automate. The best way to use a swamp cooler is to open windows in the rooms that need the cooling the most. You want as much windowspace opened as possible without any outdoor air coming back in through the windows. There are some automated devices I've seen (such as UP-DUX that vent into the attic but they cause additional resistance so they are much less effective.
Your drawing has a couple of problems...
- You need to use the Rc terminal
- The coil on your R8222B1062 needs to connect to the Y2 and the C (not the R)
- I don't think you want to connect to the C terminal on the nest because your heating system is already providing the C to power the thermostat.
- I think you're right about this one but I wouldn't rely on the thermostat powering Y1 and Y2 simultaneously when it called for high. I would rather to design it so that if the Y1 is not powered but the Y2 was, it would still run on high. This gives you a little more redundancy in case of a relay or wire failure.
Below is a drawing that would fix these problems but it is much more generic, the only specific part is that Packard contact delay because I am unfamiliar with a generic part name for that. If you fix 1 - 3, your design should work flawlessly. Again, the exhaust ventilation is your biggest problem.
I would put a nice 24v DPDT relay and a nice 24v 3PDT relay on the appropriate mounting sockets and mount them to a DIN rail. This will make it easy and clean. Put it all in a box with the transformer and the Packard and voila.
Best Answer
OK first thing I did was remove the motor and try it in a different unit. It worked OK. So the motor's not the culprit. Another option would be to use a volt meter on the plug where it plugs in (turn the fan switch on first, check for A/C between basically all pins) see if it's passing current up there or not. If yes, motor or connection to motor would be suspect.
Next thing was to test if the electric circuit breaker was working (either using a volt meter, or by swapping it with another one). It was.
Next would have been to test the connections at the thermostat to see if they were "live" and if the thermostat, turned on, was sending "live" out up to the swamp cooler on the low or high wire.
But didn't have to, found my actual problem was that I was turning the fan to "low" but not adjusting the thermostat, which was still set to "very hot" so once I switched that, it all worked. Go figure.