Hello, I am wanting to wire my swamp cooler into a new thermostat but need some help. I know very little about wiring and have gathered some information but would like experienced users to check my logic.
The swamp cooler has a 2-speed motor, therefore I would like the thermostat to control both speeds using Y1 and Y2 terminals. As far as I know 2 stage thermostats will apply power from the R terminal to the Y2 if more cooling power is required at the same time power is applied from R terminal to Y1. I also want the water pump to work every time the thermostat calls for cooling (for both speeds)
I have found that the Honeywell RC840T-120 might allow me to use the 24v thermostat with the 110v swamp cooler and using a SPDT relay I could connect Y1 and Y2 to the 2 terminals of the 2-speed motor. Honeywell RC840T-120 was created to connect line-voltage controlled heaters to 24v thermostats but I think it will also work with the swamp cooler. This device will be the first relay that will decide if the pump and motor are going to receive power. last realy is the one that will control the power to the motor based on Y2 terminal from thermostat. The thermostat will send power to Y1 only for 1st speed and in case it needs more cooling power it will start sending power to Y1 and Y2 at the same time causing the SPDT relay to switch power to High through terminal 3 as the following diagram shows:
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