Dehumidification
2-25
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
The heating capacity of defrosting and heating
operation are controlled.
○○○
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 Reheat coil control
The reheat solenoid valve (RSV) is controlled to
carry out dehumidification.
○
02LXE10E100以降(16-28)E.qx08.8.134:40PMページ2-25
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