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Troubleshooting, Water blows through evaporative cooler – Greenheck DG / DGX with Direct Spark (470652) User Manual

Page 31

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Direct Spark Ignition Make-Up Air

31

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Troubleshooting

Evaporative Cooler does not Operate (Recirculating pump)

Supply fan must be on for cooler to operate

115 VAC between terminals

102 and 101

24 VAC between terminal A2 on

Cooling Relay (RC) and X

Cooling transformer (TR4) defective

(Replace transformer)

Optional inlet air sensor (TS4) holding

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

115 VAC between terminal

114 and 101

Cooling relay (RC) is not energized

(Check for loose connections)

(Repair or replace relay)

24 VAC between terminals

Y1 and X

Cool switch (S4) off

(Turn cool switch (S4) on)

Cool switch not wired

(Wire cool switch (S4))

No

No

No

Yes

Yes

Yes

At this time the evaporative cooler pumps should be on

Yes

Water Blows through Evaporative Cooler

Water supply greater than

evaporation and bleed-off rate?

Use the main supply valve to reduce the supply of water

Air velocity greater than

specified?

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

Are the headers in place and

located near the entering

air side of the media?

Replace headers and/or move the headers

(Reference Evaporative Cooling Recirculating Start-Up – Step #1)

Yes

No

Yes

Yes

No

No