CW3 INDIRECT COOLER INSTALLATION MANUAL | 23
TROUBLE SHOOTING
Symptom
Cause
Action
Inadequate Cooling
Under-sized ducts.
Carry out cooling load design to determine correct
size unit, ducting and outlets required.
Clogged or dirty cooling cores.
Clean or replace cores.
Dry cores or lack of water while cooler is operating.
Check water distribution system for possible
obstruction in hoses. Check pump.
Dry patches in cores
Check for blockages inside the pump hoses. Check
for blockages in the spreaders feeding the core
assemblies.
Insufficient air discharge openings or inadequate
exhaust from building, causing high humidity and
discomfort.
Make sure there is adequate provision for exhausting
stale air from building (open windows and doors).
Excessive ambient humidity (see also item above re
inadequate exhaust).
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.
Noisy cooler
Fans out of balance due to dirt, etc.
Clean the fans.
Too much back pressure.
Tight duct bends.
Grilles too small.
Re-evaluate design; improve duct layout; change
grille sizes.
Pump fails to operate.
Circuit breaker tripped.
Check pump for faults. Replace if necessary.
Pump motor failure.
Replace pump.
Fan fails to start.
Main power circuit breaker tripped.
Check cause of overload. Reset circuit breaker.
Fan motor burned out.
Replace motor.
Low system voltage.
Consult with power supply authority.
Check fault condition via the tri-colour LED on cooler
electronics module.
Rectify fault as indicated and restart the cooler.
Controller failure.
Replace controller.
Pump runs but no water
circulation or Pump runs but
cores lack water
Insufficient water in tank.
Clean water probe immersion prongs, replace water
probe.
Water hoses or spreaders blocked.
Check and clean out blockage.
Pump strainer blocked.
Clean pump strainer.
Insufficient water supply pressure.
Check and confirm water supply pressure
Water solenoid is installed incorrectly.
Check installed in the correct water flow direction
Continuous overflow of water.
Heavy core deposits.
Clean or replace cores.
Drain valve failure.
Replace drain valve.
Water solenoid is installed incorrectly.
Check installed in the correct water flow direction
Water entering cooler outlet.
Loose water hose connections.
Tighten connections.
Water hose broken.
Replace cracked or broken hoses.
Cores not fitted correctly into pad frames.
Install pad frame correctly.
Incorrect or damaged cores.
Replace with new Microcore pads.
Unpleasant odour.
New cooler cores.
Fill tank, run pump for a short period to wash pads,
drain tank, refill and repeat several times if odour
persists. Odour will dissipate after a number of hours
of operation.
Cooler located near source of unpleasant odour.
Remove source of odour or relocate cooler.
Algae in tank water.
Drain pan, clean thoroughly with strong cleansing
agent, refill, change cores.
Cores remain wet after shut down.
Run fan on "vent" for 10 minutes after cooling cycle to
dry cores out.
Heavy core deposits.
Clean or replace cores.