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Excessive vibration
Check / Resolve
●
Flexible connection
Check / Tighten
●
Vibration isolator
Check / Tighten
●
Intake air not obstruct
Check / Clear
●
Coil Section
Fin block
Check / Clean
●
Frost protection
Check / Apply
●
Drain trap clog
Check / Clear
●
Corrosion
Check / Treat / Repair
●
Leakage
Check / Repair
●
Bolts & nuts secure
Check / Tighten
●
Filter
Resistance (Washable)
Check / Clean
●
Resistance (Disposable)
Check / Replace
●
Damper
Dirt accumulation
Check / Clean
●
Sign of damage
Check / Repair / Replace
●
Turning torque
Check / Repair
●
Electrical
Control
Control box & wiring
Check / Repair / Replace
●
Protection breaker
Check / Calibrate
●
Internal lighting
Check / Replace
●
Electric Heater
Dirt accumulation
Check / Clean
●
Safety cut out
Check
●
Functionality
Refer Manufacturer
Recommendation
●
Heat Wheel /
Heat Pipe
Functionality
Refer Manufacturer
Recommendation
●
Moisture
Eliminator
Dirt accumulation
Check / Clean
●
7.6 Electric Heater
Check for dirt accumulation and clean if
necessary with a soft brush. Check the
safety control, cables and connections
operation.
IMPORTANT
AIR VELOCITY SHOULD NOT BE
LOWER THAN 2.0 m/s.
7.7 Heat Wheel & Heat Pipe
The unit should be maintained in line with
the manufacturer recommendation. Please
refer installation and maintenance manual
for details.
7.8 Moisture Eliminator
Check the dirt accumulation at the blades,
remove and clean the blades if necessary.
Ensure the blades are correctly positioned
and not distorted.
7.9 Maintenance Plan for Air
Handling Units
The schedule provided in Table 4 gives
recommended maintenance intervals for
the AHU unit (Guideline only).
Intervals are based upon normal running
conditions, in a moderate climate and
assuming 12-hour running. Units operating
outside these guidelines may require
shorter or longer maintenance intervals.
8. Trouble Shooting
Use Table 5 to assist in trouble-shoot the
malfunction in Air Handling Unit operation.
Table 5 - Trouble shooting analysis
Symptom
Probable Cause
Recommended Action
Motor fail to start
a)
Blown fuse or open circuit breaker.
b)
Improper wiring.
c)
Mechanical Failure.
a)
Replace fuse or reset circuit breaker.
b)
Check wiring with diagram supplied.
c)
Check motor & drive rotate freely &
bearing lubricant.
Motor stall
a)
Short circuit or phase to earth.
a)
Check line phases and terminal block
