14.2 INITIAL CHECK
D A N G E R
The refrigerant R410A, charged in the HITACHI air conditioners and
heat pumps, is an incombustible and non-toxic gas. However, if
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maximum permissible concentration of R410A in air is 0.42 kg/m
3
,
according to ISO5149. Therefore, some effective measure must be
taken to lower the R410A concentration in air below 0.42 kg/m
3
, in
case of leakage.
•
Calculation of Refrigerant Concentration
1 Calculate the total quantity of refrigerant R (kg) charged in
the system connecting all the indoor units of rooms to be
air-conditioned.
2 Calculate the room Volume V (m
3
) of each room.
3 Calculate the refrigerant concentration C (kg/m
3
) of the room
according to the following equation.
R: Total quantity of charged refrigerant (kg)
=
C: Refrigerant
concentration
NJP
3
for R410A
V: Room volume (m
3
)
•
Refer to the the technical documentation of outdoor unit for
details.
•
Make sure that the refrigerant leakage test should be
performed. The refrigerant (Fluorocarbon R410A) for this
unit is incombustible, non-toxic and odorless. However if
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suffocation.
C A U T I O N
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N O T E
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•
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14.2.1
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•
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operation and maintenance as shown below.
•
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the indoor unit.
• When equipping the duct adapter (optional), set up a service
access door at the duct adapter side in order to install the
duct adapter. Refer to the installation manual of the duct
adapter for details.
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Min.
500
Min.
500
Min.
500
Min.
100
(mm)
Single unit installation
Piping
connection
side
Service
access panel
Min.
500
Min.
500
Min.
500
Min.
500
Min.
100
Min.
100
Min.
3000
Multiple unit installation
Service
access panel
Service
access panel
Piping
connection side
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Min. 500
Min. 100
Min. 1500
Min. 1500
Min. 1000
(Piping Connection Side)
Min.
1000
(Piping connection side)
INDOOR UNIT INSTALLATION
PMML0416A rev.0 - 12/2015 - P5415720
16
