AUX ASW-07B4/HSAR, Service Manual

Page: 103 / 159

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 the
room, check the close of the
room
Enlarge the capacity of
the units, improve the
leakproofness of the
room
Insufficient refrigerant
R407C Measure the operating
current Add R407C welding
the leaked point
Too much R407C
Air intake temp is too low,
condensation water on air
intake pipe is too much,
temp of discharge is too high
Discharge a little
R407C
Effect of heat exchange is
too poor Dust on outdoor condenser
and indoor filter is too much Cleanup filter and
condenser
Some of the windings 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 installation 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 valve is
too small or the system
partly or completely
blocked
Check the openness; partly
frost on outdoor pipe system
Open the valve; use
high 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