10.14 Defrost thermostat (DTS)
It detects temperature of the evaporator coil and
indicates an end of defrosting.
CUT IN 0 ± 3°C
CUT OUT 8 ± 3°C
Not adjustable
How to determine defective or not defective
Put the defrost thermostat into a household electric
refrigerator and check as you look at a thermometer. It
is normal if there is continuity under 0°C and no
continuity above 8°C.
10.15 Dual pressure switch (DPS)
When the delivery pressure becomes excessively high
or low, it is dangerous. So, the dual pressure switch
(normally close type) is activated to stop the
compressor.
Setting valve MPa (kgf/cm
2
)
CUT OUT CUT IN
2.94 ± 0.2 2.35 ± 0.2
High pressure side
(30 ± 2) (24 ± 2)
0.20 ± 0.02 0.23 ± 0.02
Low pressure side
(2.0 ± 0.2) (2.3 ± 0.2)
Adjustment is impossible.
Judgment whether is proper or not
[High pressure side]
If there is any continuity when the pressure is
2.94MPa (30kgf/cm
2
) or lower during stop and
operation, and there is not when the pressure is
2.94MPa (30kgf/cm
2
) or higher, it is proper.
[Low pressure side]
If there is any continuity when the pressure is
0.20MPa (2.0kgf/cm
2
) or less during stop and
operation, and there is not when the pressure is
0.20MPa (2.0kgf/cm
2
), it is proper.
10.16 Storage temperature sensor (TH)
The sensor detects a storage temperature in order to
keep its temperature to an established temperature,
keeping the magnet clutch or the relay "ON" and
"OFF".
Setting of storage temperature is made by the
temperature setting switches of the controller.
– 18 –
Defrost thermostat
Dual pressure switch
Controller
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