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The Amount Of Refrigerant To Be Added - Mitsubishi Electric PURY-HP72 Service Handbook

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[6-9 Evaluating and Adjusting Refrigerant Charge ]
6-9-3

The Amount of Refrigerant to Be Added

The amount of refrigerant that is shown in the table below is factory-charged to the outdoor units.
The amount necessary for extended pipe (field piping) is not included and must be added on site.
Outdoor unit model
Amount of pre-charged refrigerant in the outdoor unit (kg)
Amount of pre-charged refrigerant in the outdoor unit [lbs-oz]
(1) Calculation formula
The amount of refrigerant to be added depends on the size and the length of field piping. (unit in m[ft])
1) When the piping length from outdoor unit to the farthest indoor unit is 30.5 m [100 ft] or shorter
Amount of added refrigerant (kg) = (0.23 x L
Amount of added refrigerant (oz) = (2.48x L
2) When the piping length from outdoor unit to the farthest indoor unit is longer than 30.5 m [100 ft]
Amount of added refrigerant (kg) = (0.21 x L
Amount of added refrigerant (oz) = (2.26x L
L
: Length of ø22.2[7/8"] high pressure pipe (m)
1
L
: Length of ø19.05[3/4"] high pressure pipe (m)
2
L
: Length of ø15.88[5/8"] high pressure pipe (m)
3
L
: Length of ø15.88[5/8"] liquid pipe (m)
4
L
: Length of ø12.7[1/2"] liquid pipe (m)
5
L
: Length of ø9.52[3/8"] liquid pipe (m)
6
L
: Length of ø6.35[1/4"] liquid pipe (m)
7
α
, α
, α
, α
, α
' , α
1
2
3
4
1
Refer to the table below.
Amount for the BC con-
trollers (standard/main)
Outdoor unit total
index
α
(kg)
1
HP72 model
3.0
HP96 model
4.5
HP144 model
6.0
HP192 model
Outdoor unit total index
HP72 model
Single
HP96 model
HP144 model
Combination
HP192 model
Round up the calculation result to the nearest 0.1kg. (Example: 18.04kg to 18.1kg)
Round up the calculation result in increments of 4oz (0.1kg) or round it up to the nearest 1oz. (Example: 78.21oz to 79oz)
HWE13080
) + (0.16 x L
1
+ (0.12 x L
) + (0.06 x L
) + (0.024 x L
5
6
' ) + (1.73 x L
1
+ (1.30 x L
' ) + (0.65 x L
' ) + (0.26 x L
5
6
) + (0.14 x L
1
+ (0.11 x L
) + (0.054 x L
) + (0.021 x L
5
6
' ) + (1.51 x L
1
+ (1.19 x L
' ) + (0.59 x L
' ) + (0.23 x L
5
6
' , α
' , α
' :
2
3
4
BC controller (main)
α
' (oz)
1
106
HA type
1
160
212
BC controller (sub)
Total number of BC
1
2
Charged amount for Out-
door Unit(s)
β (kg)
β' (oz)
0.0
0
1.0
36
0.0
0
2.0
71
HP72
HP96
11.8
11.8
26-1
26-1
) + (0.11 x L
)+ (0.2 x L
2
3
) + α
+ α
7
1
2
3
' ) + (1.19x L
' )+ (2.16 x L
2
3
' ) + α
' + α
'+ α
7
1
2
3
) + (0.1 x L
)+ (0.18 x L
2
3
) + α
+ α
7
1
2
3
' ) + (1.08x L
' )+ (1.94 x L
2
3
' ) + α
' + α
'+ α
7
1
2
3
L
' : Length of ø22.2[7/8"] high pressure pipe [ft]
1
L
' : Length of ø19.05[3/4"] high pressure pipe [ft]
2
L
' : Length of ø15.88[5/8"] high pressure pipe [ft]
3
L
' : Length of ø15.88[5/8"] liquid pipe [ft]
4
L
' : Length of ø12.7[1/2"] liquid pipe [ft]
5
L
' : Length of ø9.52[3/8"] liquid pipe [ft]
6
L
' : Length of ø6.35[1/4"] liquid pipe [ft]
7
β, β' : Refer to the table below.
α
(kg)
α
' (oz)
2
2
2.0
71
α
(kg)
α
' (oz)
3
3
1.0
36
2.0
71
- 162 -
)
4
4
' )
4
' +α
'+β'
4
)
4
4
' )
4
' +α
'+β'
4
Amount for the Indoor
Total capacity of
unit
connected indoor
units
α
(kg)
4
-
27
2.0
28
-
54
2.5
55
-
126
3.0
127
-
144
3.5
145
-
180
4.5
181
-
234
5.0
235
-
273
6.0
274
-
307
8.0
α
' (oz)
4
71
89
106
124
159
177
212
283
GB

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