Daikin LXE10E-A14 Service Manual page 133

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State Malfunction occurrence
E. Defrosting is operated q No trouble with the unit Excessive amount of moisture in cargo
frequently.
F. Refrigeration unit is
normal
A. Discharge pressure
is low.
B. Discharge pressure is q Evaporator fan
high
A. Hunting
B. Temperature
continues dropping.
C. Temperature
continues rising.
A. Abnormal noise is
generated
B. Abnormal vibration
generates
Frosting area is less than
one third of compressor surface.
Frosting area is
more than one third of
compressor surface.
Although water coupling
are connected,
condenser fan continues
rotating.
Abnormal point
w Defrosting solenoid valve Leakage
e Defrost timer
q Container
q Poor compression of compressor Abrasion of scroll slide section
w Hot gas solenoid valve Valve leakage
e Defrosting solenoid valve Valve leakage
r Injection solenoid valve Valve blocked with contamination
q Suction modulating valve Valve blocked with contamination
w Electronic expansion valve Valve blocked with contamination
q Suction modulating
valve
q Suction modulating valve Valve blocked with contamination
w Electronic expansion valve Valve blocked with contamination
e Evaporator
r Drier
t Shortage of refrigerant charging amount Refrigerant leakage
q Compressor
w Evaporator fan
e Condenser fan
q Compressor
w Piping
It is normal, since the unit is controlled to make superheat degree small
by electronic expansion valve.
Suction gas temperature sensor Defective contact of sensing section
Discharge gas
temperature sensor
Evaporator inlet sensor
Evaporator outlet sensor
q No actuation of water Insufficient cooling water flow rate
pressure switch
w No trouble with
the unit
6-3
Possible cause
Short setting timer
High cargo temperature
Poor thermal insulation or air leakage
Damages on fan blade
Rotation failure of fan motor
Actuation of fan motor thermal protector
Valve blocked with contamination
Magnetic coil malfunction
Wire breakage
Insufficient evaporator air flow rate ( Refer to 3-B-y.)
Drier blocked with contamination
Worn-out of bearing
Abrasion of scroll slide section
Loose-tightened bolt
Loose fan motor set bolt
Deformation of fan motor set leg or loose-tightened bolt
Bending of fan motor shaft
Worn-out of fan motor bearing
Deformation of fan guide
Contact between fan and fan guide
Loose-tightened fan motor set bolt
Bending of fan motor shaft
Worn-out of fan motor bearing
Deformation of fan guide
Deformation of condenser front panel
Loose-tightened set bolt
Loose-tightened or missing of clamp bolt
Deviation from specified sensor characteristics
Defective contact of sensing section
Deviation from specified sensor characteristics
In back-up operation due to faulty sensor
In back-up operation due to faulty sensor
Water pressure switch malfunction
To prevent temperature in the control box from rising,the condenser
fan rotates at the ambient temperature of 30˚C or higher.