6-3
State
Malfunction occurrence
Abnormal point
Possible cause
E. Defrosting is operated
q
No trouble with the unit Excessive amount of moisture in cargo
frequently.
w
Defrost timer
Short setting timer
F. Refrigeration unit is
q
Container
High cargo temperature
normal
Poor thermal insulation or air leakage
A. Discharge pressure
q
Poor compression of compressor Abrasion of scroll slide section
is low.
w
Hot gas solenoid valve Not open
e
Defrosting solenoid valve Not open
r
Injection solenoid valve
Valve blocked with contamination
B. Discharge pressure is
q
Evaporator fan
Damages on fan blade
high
Rotation failure of fan motor
Actuation of fan motor thermal protector
A. Hunting
q
Suction modulating valve Valve blocked with contamination
w
Electronic expansion valve Valve blocked with contamination
B. Temperature
q
Suction modulating
Valve blocked with contamination
continues dropping.
valve
Magnetic coil malfunction
Wire breakage
C. Temperature
q
Suction modulating valve Valve blocked with contamination
continues rising.
w
Electronic expansion valve Valve blocked with contamination
e
Evaporator
Insufficient evaporator air flow rate ( Refer to
3
-B-
y
.)
r
Drier
Drier blocked with contamination
t
Shortage of refrigerant charging amount
Refrigerant leakage
A. Abnormal noise is
q
Compressor
Worn-out of bearing
generated
Abrasion of scroll slide section
Loose-tightened bolt
w
Evaporator fan
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
e
Condenser fan
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
B. Abnormal vibration
q
Compressor
Loose-tightened set bolt
generates
w
Piping
Loose-tightened or missing of clamp bolt
Frosting area is less than
It is normal, since the unit is controlled to make superheat degree small
one third of compressor surface.
by electronic expansion valve.
Frosting area is
Suction gas temperature sensor Defective contact of sensing section
more than one third of
Deviation from specified sensor characteristics
compressor surface.
Discharge gas
Defective contact of sensing section
temperature sensor
Deviation from specified sensor characteristics
Evaporator inlet sensor
In back-up operation due to faulty sensor
Evaporator outlet sensor
In back-up operation due to faulty sensor
Electronic Expansion valve Valve blocked with contamination
Although water coupling
q
No actuation of water Insufficient cooling water flow rate
are connected,
pressure switch
Water pressure switch malfunction
condenser fan continues
w
No trouble with
To prevent temperature in the control box from rising,
rotating.
the unit
the condenser fan rotates at CBS of 59˚C or higher.
e
Refrigerant over
Condenser fan is operating due to abnormal high
charged
pressure caused by refrigerant over charged
4
Inside
temperature
does
not
rise
(in
the
heating
m
ode)
5
Control
is
u
nstable
6
Abnormal
n
oise
or
abnormal
vibration.
8
Water-cooled
operation
is
impossible
7
Abnormal
frosting
on
compressor
3
Inside
temperature
does
not
drop.
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