Hitachi 7E300020, Технический каталог, Страница: 100 / 158

9. Refrigerant and water piping
TCGB0075 rev.0 - 11/2012
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9.1.3 Refrigerant charge
The YUTAKI S80 has two refrigerant circuits. The R410A circuit (1st cycle) works with this refrigerant while the indoor circuit
(2nd cycle) works with R134a refrigerant. Piping connections must be performed in the R410A cycle between the outdoor
unit and the indoor unit.

Refrigerant charge amount
Outdoor unit Indoor unit
R410A
H20
R134a
• The 1st cycle (R410A) is factory charged with a refrigerant charge amount for 30m of piping length. The maximum
refrigerant piping length is 30m so it is not required an additional refrigerant charge.
• The 2nd cycle (R134a) connections are factory installed and refrigerant charged so no piping work or refrigerant char-
ge is needed.
N O T E
• Refer to the outdoor unit Installation and operation manual to charge the R410A refrigerant inside the indoor unit.
• Supply power to the indoor unit and switch the DSW1-2 ON of its PCB1. Thereby the indoor unit SV1 and SV2
open to allow the vacuum and refrigerant charge operation inside the indoor unit. Very important to remind to
switch the DSW1-2 OFF when finishing the whole procedure.

Refrigerant charge before shipment (W
0
(kg))
Unit type Unit model W
0
(kg) R410A W
0
(kg) R134a
Outdoor unit
RAS-4H(V)RNME-AF 3.9 -
RAS-(5/6)H(V)RNME-AF 4.0 -
Indoor unit RWH-(4-6)FS(V)NFE - 2.5
9.1.4 Precautions in the event of gas refrigerant leaks
The installers and those responsible for drafting the specifications are obliged to comply with local safety codes and regu -
lations in the case of refrigerant leakage.
C A U T I O N
• Check for refrigerant leakage in detail. If a large refrigerant leakage occurred, it would cause difficulty with
breathing or harmful gases would occur if a fire were in the room.
• If the flare nut is tightened too hard, it may crack over time and cause refrigerant leakage.