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Troubleshooting
Evaporative Cooler does not Operate (Recirculating pump)
Supply fan must be on for cooler to operate
24 VAC between terminals
Y1 and C
Yes
24 VAC between terminal A2 on
Cooling Relay (RC) and C
Yes
115 VAC between terminals
102 and 101
Yes
115 VAC between terminal
116 and 101
Water Blows through Evaporative Cooler
Are the headers in place and
located near the entering
air side of the media?
Yes
Water supply greater than
evaporation and bleed-off rate?
No
Air velocity greater than
specified?
No
®
No
No
Optional inlet air sensor (TS4) holding
(Adjust TS4 setting. Reference Blower Start-Up – Step #6)
No
Cooling transformer (TR4) defective
No
Cooling relay (RC) is not energized
Yes
At this time the evaporative cooler pumps should be on
No
Replace headers and/or move the headers
Yes
Use the main supply valve to reduce the supply of water
Yes
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
Cool switch (S4) off
(turn cool switch (S4) on)
Cool switch not wired
(wire cool switch (S4))
(Replace transformer)
(Check for loose connections)
(Repair or replace relay)
Model IG / IGX Make-Up Air
25
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