Water Blows through Evaporative Cooler

Troubleshooting

Evaporative Cooler does not Operate (Recirculating pump)

Supply fan must be on for cooler to operate

24 VAC between terminals

Y1 and X

Yes

24 VAC between terminal A2 on

Cooling Relay (RC) and X

Yes

115 VAC between terminals

102 and 101

Yes

115 VAC between terminal

114 and 101

Cool Switch (S4) off

(Turn Cool Switch (S4) on)

Cool Switch not wired

(Wire Cool Switch (S4))

Optional Inlet Air Sensor (TS4) holding

(Adjust TS4 setting. Reference Blower Start-Up Step #6)

Cooling Transformer (TR4) defective

(Replace transformer)

Cooling Relay (RC) is not energized

(Check for loose connections)

(Repair or replace relay)

Yes

At this time the evaporative cooler pumps should be on

Are the headers in place and		No
located near the entering		No
located near the entering
air side of the media?

	Yes
	Yes

Water supply greater than		Yes
evaporation and bleed-off rate?

	No

Air velocity greater than		Yes
specified?
specified?

	No
	No

Replace headers and/or move the headers. (Reference Evaporative Cooler Start-Up Step #1)

Use the main supply valve to reduce the supply of water.

Reduce the air velocity through the media.

(Reference Blower Start-Up Step #5)

At this time the evaporative cooler should be operating without water blowing through.

Model MSX Make-Up Air

470658 MSX specifications

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