3. General information
3.1 Controller
The refrigeration unit employs a new microcomputerized
controller which has a character display function, and
the desired inside temperature can be accurately and
digitally set with the soft touch type switch. Moreover,
a trouble can be easily diagnosed.
3.2 Drive system
(1) In case of engine drive from a running vehicle
The refrigeration unit is operated in which the
engine of a running vehicle drives the compressor
by belt and condenser fan and evaporator fan are
driven by a direct current motor respectively.
After having the ignition switch of its vehicle
turned on and the vehicle started, the refrigeration
unit can be operated with the controller operation
switch "ON".
(2) In case or motor drive (Type 2)
The refrigeration unit is equipped with a motor
drive besides engine drive from a running vehicle
and can be operated by the power supply (standard
specification, 3-phase AC 220V 60Hz, 380V
50/60Hz, 415V 50Hz) at a garage, truck terminal,
ferry boat, etc.
It can be operated with the controller operation
switch "ON" after connecting three-phase power
source to an outlet of the power source box.
3.3 Operation control
When a storage air temperature is higher than the
temperature established by the thermostat, it starts
cooling operation with the magnet clutch of the
compressor connected, and when the storage air
temperature has been lowered to the temperature
established by the thermostat, the magnet clutch will be
disconnected and the fan stops together with the
compressor, which in turn stops cooling operation. The
evaporator does not stop but continues to operate.
3.4 Defroster
In order to prevent the evaporator from being covered
with frost and reducing its cooling effect, the defrost
timer (it will be established within three hours before
being shipped out from our factory) operates
defrosting.
When defrosting has been completed and temperature
of the evaporator has risen, changes to cooling
operation by the defrost thermostat. Also the evaporator
fan stops during the defrosting operation, keeping
warm air from going into the inside.
Further when the storage is loaded with watery goods
or cooling in the storage is slow, defrosting can be
made by manual operation.
3.5 Protective device
The refrigeration unit is protected both by a protective
device (dual pressure switch) which stops the unit when
discharging pressure of the compressor becomes
unusually high and the dissolving plug which
discharges refrigerant when the pressure becomes
higher due to fire, etc.
Also these devices will stop the refrigeration units
when discharging temperature of the compressor
becomes unusually high due to leakage of refrigerant,
etc. When the unit has been abnormally stopped by the
protective device (except fusible plug), an abnormal
indication lamp will display its abnormality.
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