Thank you for posting this! I just capped the common on the new one and yes, it did not power up. There are 5 wires. Regardless of what your case may be, make sure that you are well-acquainted with all pertinent requirements and regulations. Connect the black wire to the terminal on the circuit breaker and tighten up well to secure the connection. The cool settings hi or lo is full operation with pump wetting the pads and blower distributing cooled air into the residence. Go through the local requirements for the wiring of electrical devices.
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:
How to Wire a Swamp Cooler
If you got a good answer, email me directly since it says on this site it will to post gdouhan ucanr. The wiring of a swamp cooler is not complex but if you have never wired up a motor before, or feel uncomfortable with electricity, it is advisable to hire an electrician to wire up your cooler. All common wires white are tied together so the circuit is completed. The high cool only speeds up the fan, the pump stops. It can still be used like a switch by simply pressing the auto button and than cool or fan.