Trouble Shooting - Seeley Convair CTA250 Installation & Operation Manual

TROUBLE SHOOTING

Symptom
Inadequate cooling
Noisy cooler
Pump fails to operate
Fan fails to start
Pump runs but no water
circulation or Pump runs
but pads lack water
Continuous overflow of
water
Water entering cooler outlet
Unpleasant odour
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Cause
Under-sized cooler.
Under-sized ductwork.
Clogged or dirty cooling pads.
Dry pads or lack of water while cooler is
operating.
Insufficient air discharge openings or
inadequate exhaust from building, causing high
humidity and discomfort.
Excessive ambient humidity (see also item
above regarding inadequate exhaust).
Fan out of balance due to dirt, etc.
Too much back pressure.
Tight ductwork bends.
Grilles too small.
Fuse blown
Pump motor failure.
Motor fuse blown
Fan motor burned out.
Low system voltage.
Insufficient water in pan (reservoir).
Water blocked.
Pump strainer blocked.
Insufficient water supply pressure.
Float valve adjustment not correct.
Heavy pad deposits.
Loose water hose connections.
Water hose broken.
Cover not fitted on float valve.
Pads not fitted correctly into pad frames.
Incorrect or damaged pads.
New cooler pads.
Cooler located near source of unpleasant
odour.
Algae in pan (reservoir) water.
Pads remain wet after shut down.
Heavy pad deposits.
Action
Replace with larger cooler.
Carry out cooling load design to determine
correct size unit, ducting and outlets required.
Clean or replace pads.
Check water distribution system for possible
obstruction in hoses. Check pump.
Make sure there is adequate provision for
exhausting stale air from building (open
windows and doors).
On days during summer when ambient
humidity is high the cooler will not reduce the
temperature as much as on drier days. There is
no remedy except to shut off the pump.
Clean the fan.
Re-evaluate design; improve ducting layout;
change grille sizes.
Check pump for faults. Replace fuse.
Replace pump.
Check cause of overload. Replace fuse
Replace motor.
Consult with power supply authority.
Adjust float level.
Check and clean out blockage.
Clean pump strainer.
Check and confirm water supply pressure
Adjust float valve.
Clean or replace pads.
Tighten connections.
Replace cracked or broken hoses.
Replace float valve.
Install pad frame correctly.
Replace with new Chillcel pads.
Fill pan (reservoir), run pump for a short period
to wash pads, drain pan (reservoir), refill and
repeat several times if odour persists. Odour
will dissipate after a number of hours of
operation.
Remove source of odour or relocate cooler.
Drain pan, clean thoroughly with strong
cleansing agent, refill, change pads.
Run fan on "vent/fan" for 10 minutes after
cooling cycle to dry pads out.
Clean or replace pads.