UNIT SERVICE
HCV & HCVR Evaporative Cooling & Gas Heating
Page 20 of 26
Gas Controls
Gas controls and gas valve shall not be dismantled or serviced in the field. If necessary, faulty units should
be replace with reconditioned or new units. Check before reassembly that gas lines are clean and free from
dirt and deposits.
After maintenance work has been carried out and the gas burner and gas controls have been reassembled
check all gas lines for leaks and check that all electrical terminals are secure.
NOTE: All wiring must be done in accordance with applicable local codes. If any of the original wire as
supplied with the appliance required replacement it must be replaced with 105°C or its replacement.
F
AULT
F
INDING
Cooling Section
The following list covers some service problems and included means of rectification and remedies.
Inadequate cooling
1.
Clogged or dirty pads – Clean or replace.
2.
Dry pads or lack of water while cooler is in operation – Check water distribution system for possible
obstruction in tubing. Check pump operation.
3.
Insufficient air discharge openings or inadequate exhaust from area being cooled, causing high
humidity – Make sure there is adequate provision for exhausting air from area being cooled.
Fan does not start
1.
Circuit breaker tripped or fuse blown – Reset or replace fuse.
2.
Loose electrical connections – Check all connections
3.
Faulty control switch – Replace.
4.
Faulty motor – Replace.
5.
Loose pulley or belt – Tighten belt and pulleys.
6.
Broken belt – Replace.
Overheating Motor
(Trips contactor overload or stops and starts when cooled)
1.
Belts too tights – Adjust.
2.
Wrong setting of adjustable motor pulley – Adjust for correct motor amps.
3.
Wrong motor – Fit correct size motor.
Belt slip or excessive belt wear
1.
Belt loose – Tighten belt
2.
Pulleys out of line – Adjust positions.
3.
Wet belt – Stop any water leaking onto belt from Celpad or distribution system.
4.
Worn belts – replace. Worn or distorted pulleys – replace.
Pump fails too operate
1.
Pump motor faulty – replace pump
2.
Incorrect wiring of pump and control switch – Correct
3.
Loose electrical connections – check all connections.
4.
Pump switch faulty – replace switch.
Pump runs but water not circulated or pads dry
1.
Pump motor faulty – replace pump
2.
Pump strainer basket blocked – Remove, clean and replace
3.
Blocked water tubes – remove, clean and replace.
