6-10
Symptom Checkpoint RemedyCause
・Stop of
evaporator fan
・
Faulty operation of suction
modulating valve SMV
Temperature
continues to
increase
・Excessive frost
on evaporator
・
Opened discharge
gas bypass
solenoid valve BSV
(dusts caught in)
・Excessive frost
on evaporator
Temperature
continues to
decrease
・Disconnection of
fuse (Fu2) circuit
・
Faulty operation
of defrost solenoid
valve DSV
Replace the Fu2
Check operation of the DSV
⇒Replace the DSV
The evaporator fan stops
Check the fan motor
Temperature continues
to decrease
Check for disconnection
in the Fu2 circuit
Is the DSV outlet
pipe cold?
Check the SMV
YES
YES
YES
NO
NO
NO
NO
YES
Is the opening of the
SMV 36% or more?
Is the BSV outlet
pipe hot?
Check operation of the BSV
⇒Replace the BSV
YES
NO
Temperature continues
to increase
Manual defrost
※ As for the manual defrost, refer to page 2-23.
Piping
・Removed or
loosen cramp
Auditory check
Visual check
Correct the cramp
Abnormal noise
Malfunction of
compressor inside
Auditory check Replace
Fan motor of
evaporator, condenser
・Worn bearing
Auditory check Replace the unit
・Interference with
fan guide
Auditory check
Visual check
Replace the faulty parts
Abnormal
vibration
Compressor, fan
motor
・Loosen bolt
Auditory check
Visual check
Tighten bolts
Ⅴ Control is unstable (during chilled proportional control operation)
Ⅵ Abnormal noise or vibration
06LXE10E-A(1-27)07.2.233:11PMページ6-10
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