Refrigerant Circuit; Drain Piping - Hitachi YUTAKI M Serie Manual De Instrucciones

DRAIN PIPING

• Cap the end of the pipe when pipe is to be inserted through
a wall hole.
• Do not put pipes on the ground directly without a cap or vinyl
tape at the end of the pipe.
• If piping installation is not completed until next day or over
a longer period of time, braze off the ends of the piping
and charge with oxygen free nitrogen through a Schrader
valve type access fitting to prevent moisture and particle
contamination.
• It is advisable to insulate the water pipes, joints and

7.2 REFRIGERANT CIRCUIT

7.2.1 Refrigerant charge
The R410A refrigerant is factory charged in the outdoor unit.
7.2.2 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
regulations in the case of refrigerant leakage.
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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.
8 DRAIN PIPING
8.1 WATER DRAIN DISCHARGE CONNECTION (ACCESSORY)
When the base of the unit is temporarily used as a drain
receiver or the drain water in it is discharged, this drain boss is
used to connect the drain piping.
Model
DBS-26
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Connecting procedure
1 Insert the rubber cap into the drain boss up to the extruded
portions
2 Insert the boss into the unit base and turn approximately 40
degree counter-clockwise.
3 Size of the drain boss is 32 mm (O.D.)
4 A drain pipe should be field-supplied
10 PMML0342B rev.1 - 03/2016
Applicable Model
RASM-(3-6)(V)NE
connections in order to avoid heat loss and dew
condensation on the surface of the pipes or accidental
injures due to excessive heat on piping surfaces.
• Do not use insulation material that contains NH3, as it can
damage copper pipe material and become a source of future
leakage.
• It is recommended to use flexible joints for the water piping
inlet and outlet in order to avoid vibration transmission.
• Water circuit must be performed and inspected by a licensed
technician and must comply with all relevant European and
national regulations.
• Proper water pipe inspection should be performed after
piping work to assure there is no water leakage in the space
heating circuit.
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Maximum permitted concentration of HFCs
The refrigerant R410A (charged in the outdoor unit) is an
incombustible and non-toxic gas. However, if leakage occurs
and gas fills a room, it may cause suffocation.
The maximum permissible concentration of HFC gas according
to EN378-1 is:
Refrigerant Maximum permissible concentration (kg/m
R410A
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N O T E
Do not use this drain boss set in a cold area because the drain water
should freeze. This drain boss is not sufficient to collect all the drain
water. If collecting drain water is completely required, provide a drain-pan
that is bigger than the unit base and install it under the unit with drainage.
Drain pipe
Drain pipe
Extruded portion
Drain Boss
Rubber cap
)
3
0.44
Drain hole of Base