Hitachi SET FREE Serie Manual De Instrucciones página 54

PIPING WORK AND REFRIGERANT CHARGE

Maximum additional refrigerant charge quantity
Ensure that the total additional charge quantity should not exceed the max. additional refrigerant charge quantity.
maximum additional refrigerant
charge quantity (kg)

Refrigerant charge amount of outdoor unit before shipment (W0) kg
model W0 outdoor unit refrigerant charge (kg)
ras-8fsXnse
ras-10fsXnse
ras-12fsXnse
ras-14fsXnse
ras-16fsXnse
ras-18fsXnse
ras-20fsXnse
ras-22fsXnse
ras-24fsXnse
?
n o t e
• In case of the combination of the base units, calculate the total refrigerant charge before shipment of the outdoor units to be combined.
• Regarding the fluorocarbon, follow the specification label or refrigerant label attached to the product. After the additional refrigerant charge, record
the total refrigerant (= refrigerant before shipment + additional refrigerant in the field) in the refrigerant label. In case of the combination of base
units, record the total refrigerant in the main unit label.
• When the refrigerant is recovered or charged because of repairing, operating or adjusting the unit, record the refrigerant quantity again.
• Emissions of the fluorocarbons are prohibited.
• For disposal and maintenance of this product, collection of fluorocarbons is required.
8.7 CHarGinG Work
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.
If it is impossible to charge the specified quantity of refrigerant,
fully open the stop valve for the gas line. (For heat recovery
system, both stop valves of high/low pressure and low pressure
side).
Charge the correct refrigerant quantity according to Additional
refrigerant charge calculation. If not, a compressor may be
damaged due to an excess or insufficient refrigerant charge.
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.
Insulate the liquid piping and gas piping completely to avoid
decreasing of performance and dewing on the surface of the pipe.
Insulate the flare nut and union of the piping connection with
insulation.
44 PMML0479 rev.2 - 02/2018
(5-10) 12 (14/18)
28.0 36.0 40.0
5.0
5.0
7.2
8.9
9.9
10.7
11.3
11.3
11.6
HP
(20-22) 24
51.0 52.0
model W0 outdoor unit refrigerant charge (kg)
ras-5fsXnPe
ras-6fsXnPe
ras-8fsXnPe
ras-10fsXnPe
ras-12fsXnPe
ras-14fsXnPe
ras-16fsXnPe
ras-18fsXnPe
Check to ensure that there is no gas leakage. If a large refrigerant
leakage occurs, it will cause difficulty with breathing or harmful
gases would occur if a fire was being used in the room.
?
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.
!
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 shipment).
(26-66) (68-88) (90-96)
63.0 73.0 93.0
4.7
5.0
8.5
8.5
9.3
9.3
10.0
10.6