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PIPING WORK AND REFRIGERANT CHARGE
Additional refrigerant charge calculation for indoor unit (W3 kg)
Additional refrigerant charge is 1kg/unit of 8HP and 10HP indoor unit and 2kg/unit of 16 and 20 HP.
Additional refrigerant charge of less than 8HP indoor units is not needed.
8 and 10HP Total Indoor Unit Numbers Additional Charge
16 and 20HP Total Indoor Unit Numbers Additional Charge
number of 16 and 20 HP indoor units× 2.0kg/unit
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.
Condition
Depending on outdoor unit combination model, additional refrigerant charge is required. Select adequate refrigerant charge from the
table below. (W5 kg)
RAS-24FSXNSE
Outdoor Unit
RAS-38FSXNSE
Model
RAS-42FSXNSE
RAS-46FSXNSE
Additional
Refrigerant
1.0
Charge (kg)
Additional Refrigerant Charge Quantity for Each CH-Box (Multiple Branch Type) Connected (W6 kg) (Heat recovery systems only)
If CH-Boxes (multiple branch type) are connected, additional refrigerant charge is required. Select adequate refrigerant charge from
the table below.
CH-Box Model
Additional Refrigerant Charge (kg)
Calculation of additional charge (W kg) = W1 + W2 + W3 +W4 + W5 (Only Heat pump)
Calculation of additional charge (W kg) = W1 + W2 + W3 +W4 + W5 + W6 (Only Heat Recovery)
N O T E
43
PMML0479 rev.2 - 02/2018
number of 8 and 10 HP indoor units× 1.0kg/unit =
Refrigerant amount
0.0kg
0.5kg
RAS-56FSXNSE
RAS-60FSXNSE
RAS-64FSXNSE
RAS-48FSXNSE
RAS-68FSXNSE
RAS-74FSXNSE
RAS-78FSXNSE
2.0
1.0
CH-AP04MSSX
CH-AP08MSSX
0.1
0.2
=
RAS-62FSXNSE
RAS-66FSXNSE
RAS-72FSXNSE
RAS-70FSXNSE
RAS-86FSXNSE
RAS-80FSXNSE
RAS-88FSXNSE
RAS-82FSXNSE
RAS-90FSXNSE
RAS-84FSXNSE
RAS-94FSXNSE
RAS-92FSXNSE
2.0
3.0
CH-AP12MSSX
CH-AP16MSSX
0.3
0.4
RAS-96FSXNSE
4.0
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