30
The total refrigerant charge of the system should be calculated in the following formula.
Total of Refrigerant Charge
=
W
+
W
0
The system
=
+
=
kg
4.8 Additional Refrigerant Charge Work
(1) The additional refrigerant charge is required according to the calculation.
(2) Before charge work, make sure that the stop valves are fully closed.
(3) Charge the additional refrigerant from the check joint of liquid stop valve.
(4) After refrigerant has been charged, fully open the liquid stop valve and gas stop valve.
(5) If it is impossible to charge the required quantity of refrigerant, follow the procedure below.
(A) Fully open the gas stop valve.
(B) Operate the compressor in the cooling mode and charge the additional refrigerant from the check
joint of the liquid stop valve. At this time, keep the liquid stop valve slightly open.
(C) After the refrigerant is charged, fully open the liquid stop valve and the gas stop valve.
(D) Carefully calculate any additional refrigerant quantity for charging. If the quantity of additional
refrigerant is not correct, it might cause the system in an abnormal condition. The additional refrigerant
must be charged as liquid.
◆
Do not apply excessive force to the stop valves after fully opening the valves.
◆
At the test run, fully open the gas and liquid stop valves.
4.9 Pressure Measurement
When the pressure is measured, it can be applied by the check joints as the following figures. Connect the
pressure gauge according to the table below, because of high pressure side and low pressure side change by
operation mode.
Item
Cooling Operation
Heating Operation
Check joint for gas stop valve “A”
Low Pressure
High Pressure
Check joint for piping “B”
High Pressure
Low Pressure
Check joint for liquid stop valve “C”
High Pressure
High Pressure
a) RAS-3.0~4.0HNSKQ
b) RAS-4.5~6.0HNSKQ
c) RAS-6.5~7..0HNSKQ