High ambient relative humidity,
low temp/speed of air flow
Water is blow out from air
outlet, or wa ter drips from the
outlet. Lower speed of air flow
Suggest set the unit s to
dehumidifying mode at hig h
speed of air flow, to lower
relative humidity; if th e hig h
speed is still felt lower, the
fan motor must be checked
3.2 Poor cooling or heating effect
Reason
Check to be made
Proposed remedy
The cooling/heating load of the
room is heavy or the room is not
closed perfectly
Calculate the area of t he room,
check the close of the room
Enlarge the capacity of the
units,
improve
the
leakproofness of the room
Insufficient refrigerant R410A
Measure the operating current
Add R410A
welding the
leaked point
Too much R410A
Air intake temp is to o low ,
condensation water on air
intake pipe is too much, temp
of discharge is too high
Discharge a little R410A
Effect of heat exchange is too
poor
Dust on outdoor condenser and
indoor filter is too much
Cleanup filter and condenser
Some of the winding s of motor
fan is short-circuit, so cause
speed decline
Speed of indoor/outdoor fan is
too low, air circulation is small
Repair or replace motor
Running condition is too bad
Check if the insta llation is
proper; outdoor temp is too
high when heating
Improve the condition, use
auxiliary heating
Convexity exists in compressor
or valve or lock of compressor
No
high-low
pressure
difference, no clear temp
difference in air intake inlet or
discharge outlet of compressor
Replace compressor or valve
Openness of check valv e is too
small or the s ystem partly or
completely blocked
Check the openness; partl y
frost on outdoor pipe system
Open the valve; use hig h
pressure N
2
to clean out the
block
3.3 Big noise or abnormal sound
Reason
Check to be made
Proposed remedy
Foreign matters in wind guide
or impeller fan
Check if they are
Clear away
Fan is distorted or in bad
balance
Check them
Replace indoor/outdoor fan
Improper location of fan, so fan
touches the housing
Open the unit or move the fan
manually, find the location
Adjust the position
Bearing of the fan is sluggish or
destroyed
Check the bearing
Replace the bearing
Connecting pipe vibrates due to
improper installation, or touch
the lower frame
Check the connecting pipe
Tidy up the pipe s, e liminate
the noise source
Outdoor pipes touches
Check the vibration of the
pipes, check if them touch
Tidy up the pipes
Abrasion of the parts of
compressor
Check
if
the soun
d
of
compressor is normal
Replace the compressor
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