Hitachi SET FREE Serie Manual De Instrucciones página 53
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PIPING WORK AND REFRIGERANT CHARGE
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
-
number of 16 and 20 HP indoor units× 2.0kg/unit
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
outdoor Unit
ras-38fsXnse
model
ras-42fsXnse
ras-46fsXnse
additional
refrigerant
1.0
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)
?
n o t e
•
Check that the total additional refrigerant charge is not greater than the values given in: Maximum additional refrigerant charge quantity
•
Some refrigerant charge calculations differ when installing Wall Type (RPK Series) with the expansion valve kit. Refer to the RPK technical
information.
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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