Hitachi RAS-FSXNSE Series Instruction Manual page 54

PIPING WORK AND REFRIGERANT CHARGE
indoor Unit Capacity (HP)
additional refrigerant Charge (kg)
!
C a U t i o n
Only for Heat Recovery System, maximum additional refrigerant charge must not exceed 6.0kg.

W3
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

W4
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
• IU Capacity Ratio is ≤ 100%:
• IU Capacity Ratio is ≥ 100%:

W5
Depending on outdoor unit combination model, additional refrigerant charge is required. Select adequate refrigerant charge from the
table below. (W5 kg)
ras-24fsXnse
ras-38fsXnse
outdoor Unit model
ras-42fsXnse
ras-46fsXnse
additional refrigerant
Charge (kg)

W6
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)

W
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)
32 PMML0479 rev.4 - 11/2018
0.4 - 1.0
0.3
number of indoor units x (0.3kg/unit or 0.5kg/unit) =
number of 8 and 10 HP indoor units× 1.0kg/unit =
number of 16 and 20 HP indoor units× 2.0kg/unit =
Refrigerant amount
0.0kg
0.5kg
ras-48fsXnse
1.0 2.0
CH-aP04mssX CH-aP08mssX
0.1
1.5 - 6.0
0.5
ras-62fsXnse
ras-56fsXnse
ras-66fsXnse
ras-60fsXnse
ras-70fsXnse
ras-64fsXnse
ras-80fsXnse
ras-68fsXnse
ras-82fsXnse
ras-74fsXnse
ras-84fsXnse
ras-78fsXnse
ras-92fsXnse
1.0 2.0
CH-aP12mssX
0.2 0.3
≤6.0kg
ras-72fsXnse
ras-86fsXnse
ras-88fsXnse ras-96fsXnse
ras-90fsXnse
ras-94fsXnse
3.0 4.0
CH-aP16mssX
0.4