Partial
frozen
2-26
2.5.5 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.
○
02LXE10E-A(17-29)07.2.2015:39ページ2-26
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