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46
Troubleshooting table
MALFUNCTION TYPE
COMPONENT
POSSIBLE CAUSE/SOLUTION
NOISE LEVEL
Fan impeller
Impeller deformed, unbalanced or loose
Nozzle damaged
Foreign bodies in the fan
Transmission
Motor or fan not attached well
Bearings
Bearing worn or deteriorated
Motor
Incorrect supply voltage
Worn bearings
Contact between the rotor and stator
Ducts
Excessive speed in the ducts
Anti-vibration joint too taut
INSUFFICIENT AIR FLOW
Ducts
Load losses superior to the demand
Dampers closed
Obstructions in the ducts
Filters
too dirty
Heat exchange coils
too dirty
EXCESSIVE AIR FLOW
Ducts
Load losses inferior to the demand
Ducts too large
Terminals not installed
Unit
Filters not inserted
Access doors open
Access doors open
INSUFFICIENT THERMAL EFFI-
CIENCY
Coil
Incorrect connection of inlet/outlet piping
Coil dirty
Air bubbles in the pipes
Excessive air flow
Electric pump
Insufficient water flow
insufficient pressure
Wrong direction of rotation
Fluid
Temperature different from the project
Incorrect regulation bodies
WATER LEAK
Fan section
Leak from the coil due to corrosion
Dragging of drops due to high air velocity
Clogged "overflow" drain