Table Des Matières - Hitachi RAS-8FSXN1E Manuel D'utilisation

PIPING WORK AND REFRIGERANT CHARGE
Nº Symbol
Additional refrigerant charge calculation for indoor unit (W3 kg)
Additional refrigerant charge is 1kg/unit of 8HP and 10HP indoor unit.
3 W3 Additional refrigerant charge of less than 8HP indoor units is not needed.
8 and 10HP Total Indoor Unit Numbers
The ratio of indoor unit connection capacity (indoor unit total capacity/outdoor unit capacity) = additional charge
(W4 kg).
Determine the ratio of indoor unit connection capacity.
4 W4
Condition
•
I.U. Capacity Ratio is less than 100%:
•
I.U. Capacity Ratio is more than 100%:
5 W Calculation of additional charge (W kg) = W1 + W2 + W3 +W4
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N O T E
Some refrigerant charge calculations differ when installing Wall Type (RPK Series) with the expansion valve kit. Refer to the RPK technical information.

Maximum additional refrigerant charge quantity
Ensure that the total additional charge quantity should not
exceed the max. additional refrigerant charge quantity.

Refrigerant charge amount of outdoor unit before shipment (W0) kg
W0 Outdoor
Model unit refrigerant
charge (kg)
RAS-8FSXN1E
5.4
RAS-10FSXN1E 6.4
RAS-12FSXN1E 7.3
RAS-14FSXN1E 8.5
RAS-16FSXN1E 9.5
8.5 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).
24 PMML0392B rev.1 - 07/2016
Additional Charge
W0 Outdoor
Model unit refrigerant
charge (kg)
RAS-5FSXNHE
5.6
RAS-6FSXNHE 5.6
RAS-8FSXNHE 7.7
RAS-10FSXNHE 7.7
RAS-12FSXNHE 8.3
Contents
× 1.0kg/unit =
Refrigerant amount
0.0kg
0.5kg
Maximum additional
refrigerant charge
quantity (kg)
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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.
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.
Additional
charge (kg)
HP
(12/16-P)
(5-10) 12 (18-24)
(14/16)
28.0 36.0 40.0 51.0
kg
kg
kg
(24/32-P)
(26-54)
63.0