Partial
frozen
2-16
2.5.4 Common control
The following are controlled in different operation modes. (For the details, refer to the following pages.)
Control name Control content
Operation mode
Frozen
Chilled Defrost
A
Compressor ON/OFF control
The compressor is operated on and off to
adjust the inside temperature.
B Starting control
At the start of the operation with low ambient
temperature,an oil temperature raising control is executed.
When a protection device activates at the operation
start, a high pressure/current control is executed.
C
Evaporator fan speed control
The evaporator fan is switched to the high or low
speed according to the set point temperature.
In order to keep the superheat of the evaporator
D Superheat control optimum,the opening of the electronic expansion
valve is controlled.
E High-pressure control
In order to keep the high pressure optimum, the
opening of the electronic expansion valve is controlled.
In order to prevent the refrigerant oil from
F Injection
deteriorating, the injection solenoid valve control or
electronic expansion valve control is carried out.
G In-range control
When the control temperature is within SP ±2˚C,
the in-range lamp is turned on.
H In-range masking control
After defrosting initiation, the in-range lamp
is kept on for 90 minutes.
The circulating flow rate of refrigerant is proportionally
I Capacity control
controlled with suction modulating valve to keep the
control temperature variation within ±0.5˚C.
J
Charging and releasing control
These functions control the heating capacity
for defrosting and heating operation.
K Pump down control
The liquid refrigerant is collected into the liquid receiver
(water cooled condenser).
L Economizer control
The economizer circuit is controlled to enhance
cooling capacity.
M
Dehumidification (optional)
The unit can execute dehumidification by
reheat coil and humidity sensor.
N Bulb mode (optional)
For flower bulb transportation, the unit is
equipped with bulb mode control.
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