Panasonic PAW-160MAH2L Installation Instructions Manual page 13

While there are no fl oor area limitations for refrigerant charges of less than 1.23 kg, the mini-
mum fl oor area [A ] for larger refrigerant charge amounts can be calculated by the following
min
formula:
[
m
c
A =
min
2.5 x LFL
5/4
A = minimum fl oor area (m
min
m =
refrigerant charge (kg)
c
h =
height factor (mounting position):
0
– 0.6 for fl oor-mounted
– 1.8 for wall-mounted
– 1.0 for window-mounted
– 2.2 for ceiling mounted
LFL= R32 Lower Flammability Limit
(0.307 kg/m )
3
Calculating examples
Using the above formula, it is possible to calculate
a) the minimum fl oor area for a given refrigerant charge, or
b) the maximum refrigerant charge allowed for a given fl oor area.
2.5 m
Density limit diagrams
The following diagrams roughly demonstrate the relation between the installation space fl oor
area and the amount of refrigerant charged for the relevant R32 PACi outdoor units, provided
General information and safety instructions
]
2
x h
0
8.0
)
2
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
0.0
2.2 m
10,0 m
2
ceiling-mounted
wall-mounted
50.0 100.0
Floor area (m
Example:
S-36PF1E5B + U-36PZH2E5
3.6 kW, 7 m piping length
1,15 kg refrigerant charge
a) A given refrigerant charge amount of 1.15 kg
requires a minimum fl oor area of 0.84 m
b) For a given fl oor area of 10 m
refrigerant charge amount is 3.97 kg.
Refrigerant charge:
1,15 kg
floor-mounted
150.0 200.0 250.0
)
2
.
2
the maximum
2
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