Hitachi SET FREE Serie Manual De Instalación Y Funcionamiento página 67

Additional refrigerant charge
9.4 CHARGING WORK
The additional refrigerant charge is required according to the total
piping length. Refer to Table 8.1.
After vacuum pumping work, check that the high/low pressure
gas valve, low pressure gas valve (low pressure gas valve is for
heat recovery system only) and liquid stop valve are fully closed.
Charge the additional refrigerant from the check joint of liquid
stop valve (acceptable error must be within 0.5 kg).
After the refrigerant has been charged, fully open the liquid stop
valve and the gas stop valves.
N O T E
The gas staying at O-ring or screw part may make sound when
removing the cap of the spindle. However, it is not gas leakage.
If it is impossible to charge the specified quantity of refrigerant,
follow the procedure below:
a. Fully open the stop valve for the gas line. (For heat
recovery system, both stop valves of high/low pressure
and low pressure side).
C A U T I O N
Do not apply an excessive force to the spindle valve after fully
opening the spindle. Otherwise, the spindle valve flies out due to
refrigerant pressure. At the test run, open fully the spindle valve,
otherwise, the devices will be damaged. (It is closed before ship-
ment).
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PMML0294A_rev.2_02-2014.indb 53
PMML0294A rev.2 - 07/2014
Caution for opening stop valve
1 Do not apply an excessive force after fully opening the spin-
dle. (Tightening Torque: < 5.0N-m). (The back seat is not pro-
vided.)
2 When the valve is opened, remove the tags "Close" (Acces-
sories) and attach the tags "Open" (Accessories) instead.
3 Tighten securely the caps according to the tightening torque
(Item 8.1-(2)-(e)) after each spindle valve is opened.
Hexagonal wrench
Cap
High/Low Pressure
Low Pressure : 10mm
Liquid : 4mm
(To open or close spindle valve)
O-ring
(Rubber)
b. Operate the compressor in the cooling mode and charge
the additional refrigerant from the check joint of the liquid
stop valve (acceptable error must be within 0.5 kg). At this
time, keep the liquid stop valve slightly opened
c. After the refrigerant is charged, fully open the liquid stop
valve and the gas stop valve.
d. Calculate securely the additional refrigerant quantity for
charging. If the quantity of additional refrigerant is not cor-
rect, it may cause compressor failure. The additional re-
frigerant must be charged in a liquid condition.
e. Refrigerant charge from check joint of gas stop valve may
lead to compressor failure. Be sure to charge refrigerant
from the check joint of liquid stop valve.
Check joint
(Only the charging hose for
R410A can be connected.)
Refrigerant
pressure
Spindle valve
Counterclockwise...Open
Clockwise...............Close
Closed before shipment
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