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

Problem: Evaporative Cooling Module Does Not Operate - Recirculating Pump Control
Is fan operating correctly?
24 VAC between terminals Y1 and C
24 VAC between terminal A2 and A1 on
cooling relay (RC)?
Line voltage at primary side of TR3?
115 VAC between terminals 102 and
101?
115 VAC between
terminals 116 and 101?
Evaporative cooling pump(s) (P1)
running?
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Troubleshooting

Evaporative Cooling

Yes
Refer to 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 Blower, Start-Up.
Yes
No
Fan Interlock (ST1 or RF) open. Refer to Troubleshooting, Supply
Fan.
Yes
Transformer fuses (FU7) blown. Check and replace blown fuse(s).
No
Transformer secondary fuses (FU8) blown. Check and replace
blown fuse(s).
Yes
No Transformer TR3 wired incorrectly. Refer to wiring diagram on
transformer and correct wiring.
Transformer TR3 faulty. Replace transformer.
Yes Cooling relay (RC) failure. Check for loose connections or bent relay
No
pins, repair or replace relay.
Evaporative cooling pump(s) (P1) wired incorrectly or not wired.
Correct any wiring issues.
Yes
No
Evaporative cooling pump(s) (P1) faulty. Replace evaporative
cooling pump(s).
Everything is working properly, consult factory.
Model IGX Make-Up Air 43