2-28
I
:
Capacity control
In the chilled mode operation, adjusting cooling capacity makes the supply air temperature stable at
the set point temperature (SP).
The capacity control is executed by adjusting the opening of suction modulating valve (SMV)
between 3 to 100 %.
J
:
Charge and release control
Charge control or release control is executed to maintain the heating capacity optimum in defrosting
and heating operation.
• Charge control
q
The suction pressure (LPT) is detected and the injection
solenoid valve (ISV) is turned on, then, liquid refrigerant is
charged into the suction pipe.
w
The discharge pressure (HPT) is detected and the injection
solenoid valve (ISV) is turned on, then the liquid refrigerant is
charged into the suction piping.
• Release control
The discharge pressure (HPT) is detected and the condenser
fan (CFM) is turned on, then, the refrigerant is released into the
condenser.
K
:
Pump down stop
When starting the defrosting operation or before starting the heating operation, close the liquid
solenoid valve (LSV), carry out the pump-down operation and collect refrigerant into the
receiver. The pump-down operation is stopped when the low pressure becomes 0kPa or less.
L
:
Economizer control
This unit using an economizer circuit combining the intermediate injection into the scroll compressor
with the refrigerant heat exchanger. By turning ON the economizer solenoid valve (ESV), the
economizer circuit is activated to keep a large sub cooling performance of liquid refrigerant and
significantly increase the cooling performance.
• The economizer control is operated only while the pull-down operation is in progress.
HPT
＞
1200 kPa
HPT
≦
1150 kPa
ON
OFF
LPT
＜
40 kPa
LPT
＞
70 kPa
ON
OFF
HPT
＜
700 kPa
HPT
＞
800 kPa
ON
OFF
02̲LXE10E100以降(16-28)̲E.qx 08.8.13 4:40 PM ページ 2-28
https://daikin-p.ru
