Evaporative Cooling - Greenheck IGX Series Installation, Operation And Maintenance Manual

Problem: Evaporative Cooling Module Does Not Operate - Single Pass Control
Is fan operating correctly?
24 VAC between terminals Y1 and C
24 VAC between terminal A2 and A1
on cooling relay (RC)?
24 VAC between terminals 62 and 61?
24 VAC between terminals 8 and 61?
Water flowing to media?
Problem: Water Blows through Evaporative Cooling Module
Are the headers in place and located
near the entering air side of the
media?
Water supply to header too high?
Air velocity greater than specified?
®
Troubleshooting

Evaporative Cooling

Yes
Refer to the Troubleshooting, Supply Fan.
No
Cool switch (S4) off. Turn cool switch (S4) on.
Cool switch not wired. Wire cool switch (S4).
Yes
No
(If a cool switch is not required and a cooing inlet air sensor is
provided, place jumper from R to Y1 to allow the cooling to enable
based on the cooling inlet air sensor).
Optional inlet air sensor (TS4) holding. Adjust TS4 setting.
Reference Supply Fan, Start-Up.
Yes
No
Fan Interlock (ST1 or RF) open. Refer to Troubleshooting, Supply
Fan.
Single pass transformer TR2 circuit breaker tripped. Reset
transformer circuit breaker. If circuit breaker continues to trip, inspect
Yes
No
circuit for improper wiring or grounding.
Single pass transformer TR2 failed. Replace cooling transformer.
Yes Cooling relay (RC) failure. Check for loose connections or bent relay
No
pins, repair or replace relay.
Manual ball valve closed. Open and adjust ball valve.
Yes
No Single pass valves (VS, VSD) not wired. Wire single pass valves.
Single pass valve(s) failed. Replace failed valve(s).
Everything is working properly, consult factory.
Yes
Replace headers and/or move the headers. Reference Start-Up:
No
Optional Features, Evaporative Cooling Module.
No
Yes Use the header control valve to reduce the supply of water.
Reduce the air velocity through the media. Reference Supply Fan,
Yes
Start-Up.
Everything is working properly, consult factory.
Model IGX Make-Up Air 45