Sharp SJ-48H-S Service Manual page 10

SJ-48H-S
SJ-51H-S
SJ-55H-S
2. DEFROSTING
(1) No defrosting operation is necessary
No defrosting operation is necessary.
As this machine is so designed that a built-in
evaporator cools air and a fan circulates cooled air,
neither the freezer nor the refrigerator is frosted,
though the evaporator is frosted.
The frosted evaporator is defrosted automatically
due to the function of defrosting timer and heater,
requiring no defrosting operation.
(3) The following circuit diagrams in the table show automatic defrosting function of the refrigerator with
timer and defrost thermostat.
Operation
1. Cooling
(Normal)
2. Defrosting
(Time 20 to 30 min.)
3. Drain
(Time approx. 5 min.)
4. Restart
Electric diagram
Defrost thermostat ON Compressor running
Timer motor running
Thermostat
Timer contact
Thermo. fuse
Defrost heater
Defrost
thermostat (ON)
Figure F-3.
Defrost thermostat ON Compressor stops
Timer motor stops
Thermostat Timer contact
Thermo. fuse
Defrost heater
Defrost
thermostat (ON)
Figure F-4 .
Defrost thermostat OFF Compressor stops
Timer motor running
Thermostat Timer contact
Thermo. fuse
Defrost heater
Defrost
thermostat (OFF)
Figure F-5.
Defrost thermostat OFF Compressor running
Timer motor stops
Thermostat Timer contact
Thermo. fuse
Defrost heater
Defrost
thermostat (OFF)
Figure F-6.
(2) Where is melted ice brought
1. Melted ice is brought into the evaporating pan
at the bottom of the set and is evaporated here
by the heat of sub condenser.
2. Be sure to use the evaporating pan as inserted
so as to be level with the outer case.
The integration timer integrates running
time of the compressor. When it reaches
10 hours 50 min. at 50Hz, the timer
contact is changed to start defrosting.
TM COMP
The timer contact is changed to start
defrosting, the timer motor stops, and
power is supplied to the defrost heater.
It takes about 20 to 30 min. to defrost.
When little frosted, the defrosting takes
little time. When much frosted, the def-
TM COMP
rosting takes much time.
When the defrost thermostat becomes
OFF, the timer motor starts running.
During the operation time(4 min. 20sec.
/50Hz) defrosted water is drained outside
the refrigerator.
TM COMP
Timer contact is changed to cooling
operation and the compressor starts
running and the timer motor stops.
Defrost thermostat contact becomes ON
when it's cooled. And the timer motor
starts running. (Figure F-3.)
TM COMP
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Description