Direct Gas Make-Up Air
59
Troubleshooting
Evaporative Cooling
Problem: Evaporative Cooling Module Does Not Operate - Recirculating Pump Control
Is fan operating correctly?
Yes
No
Refer to Troubleshooting, Supply Fan.
24 VAC between terminals Y1 and C
Yes
No
Cool switch (S4) off.
Turn cool switch (S4) on.
Cool switch not wired
. Wire cool switch (S4).
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.
24 VAC between terminal A2 and A1 on
cooling relay (RC)?
Yes
No
Optional inlet air sensor (TS4) holding.
Adjust TS4 setting.
Reference Blower, Start-Up.
Fan Interlock (ST1 or RF) open.
Refer to Troubleshooting, Supply
Fan.
Line voltage at primary side of TR3?
Yes
No
Transformer fuses (FU7) blown.
Check and replace blown fuse(s).
115 VAC between terminals 102 and
101?
Yes
No
Transformer secondary fuses (FU8) blown.
Check and replace
blown fuse(s).
Transformer TR3 wired incorrectly.
Refer to wiring diagram on
transformer and correct wiring.
Transformer TR3 faulty
. Replace transformer.
115 VAC between
terminals 116 and 101?
Yes
No
Cooling relay (RC) failure.
Check for loose connections or bent relay
pins, repair or replace relay.
Evaporative cooling pump(s) (P1)
running?
Yes
No
Evaporative cooling pump(s) (P1) wired incorrectly or not wired.
Correct any wiring issues.
Evaporative cooling pump(s) (P1) faulty.
Replace evaporative
cooling pump(s).
Everything is working properly, consult factory.