Panasonic LZ2 - Check of Density Limit

xii
• The evacuation process shall be carried out prior to returning the compressor to
the suppliers.
• Only electric heating to the compressor body shall be employed to accelerate this
process.
• When oil is drained from a system, it shall be carried out safely.
00_330344_2WAY_Eng.indb 11 2020/12/21 11:26:34
Check of Density Limit
Check the amount of refrigerant in the system and floor space of the room according to the
legislation on refrigerant drainage. If there is no applicable legislation, follow the standards
described below.
The refrigerant (R32), which is used in the air conditioner, is a flammable refrigerant. So the
requirements for the maximum refrigerant charge amount [m
max
] used in the appliance are
determined according to installation space of the appliance.
Installation conditions
Procedure of preliminary calculation
1. Determine the room space in accordance with the requirements of installation.
2. Calculate the maximum refrigerant charge amount [m
max
].
When connecting the refrigerant tubes and installing
the indoor unit in each partitioned room, it is necessary
to calculate the allowable refrigerant charge amount in
each room.
For all indoor units shown in Fig. 1, calculate the
allowable refrigerant charge amount that can be used
in each room [m
IN_1
, m
IN_2
,---, m
IN_n
].
Calculate the maximum refrigerant charge for each indoor
unit from Fig. 2 by referring to the following items.
- Floor area of the room
- Indoor units type
- Capacity of indoor unit
- Installation height of Indoor Unit
- Use or nonuse of R32 refrigerant leakage detection sensor
Room No.
No. of
indoor
units
Indoor units type
Capacity
of indoor
unit
Installation
height of
Indoor Unit:
h
inst
(m)
R32 refrigerant
leakage detection
sensor
Floor area
of the
room (m
2
)
Refrigerant charge
amount that can
be used for each
indoor unit (kg)
Room_1 IN_1 4-Way Cassette 60 × 60 15 h
inst
≥ 2.2 Use 10 m
IN_1
Room_2 IN_2 Slim Low Static Ducted 56 h
inst
≥ 2.2 Nonuse 15 m
IN_2
Room_3 IN_3 4-Way Cassette 56 h
inst
≥ 2.2 Use 20 m
IN_3
--- --- --- --- --- --- --- ---
Room_m IN_n-1 Wall-Mounted 45 h
inst
≥ 1.8 Nonuse 30 m
IN_n-1
Room_m IN_n 4-Way Cassette 140 h
inst
≥ 2.2 Use 30 m
IN_n
[m
max
] = Min (m
IN_1
, m
IN_2
, m
IN_3
, ---, m
IN_n-1
, m
IN_n
)
The minimum value of the allowable refrigerant charge amount in each room is the maximum
value of the maximum refrigerant charge amount [m
max
] that can be used in the system.
3. Calculate the maximum refrigerant charge amount [m
c
]* by following details of piping
installation.
* [m
c
] ≤ 15.9 (Maximum refrigerant charge amount)
As a reference, refer to Technical Data.
4. Determine from two values [m
max
] in Step 2 and [m
c
] in Step 3.
[m
c
] < [m
max
] : Can be installed.
[m
c
] > [m
max
] : Return to Steps 1 to 3 and change the indoor unit type, capacity and pipe
length.
Fig. 1
IN_1
Room_1 Room_2 Room_3 Room_m
IN_2
IN_3 IN_n
IN_n-1
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