The Amount Of Refrigerant To Be Added - Mitsubishi Electric R410A Service Handbook

[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])
When the piping length to the farthest indoor unit is shorter than 30.5 meters (100 feet)
Amount of added refrigerant (kg) = (0.29x L
Amount of added refrigerant (oz) = (3.12x L
When the piping length to the farthest indoor unit is 30.5 meters (100 feet) or longer
Amount of added refrigerant (kg) = (0.26x L
Amount of added refrigerant (oz) = (2.80x L
L : Length of ø19.05 [3/4"] liquid pipe (m)
1
L : Length of ø15.88 [5/8"] liquid pipe (m)
2
L : Length of ø12.7 [1/2"] liquid pipe (m)
3
L : Length of ø9.52 [3/8"] liquid pipe (m)
4
L : Length of ø6.35 [1/4"] liquid pipe (m)
5
, ': Refer to the table below.
Total capacity of
connected indoor units
- 27
28 - 54
55 - 126
127 - 144
145 - 180
181 - 234
235 - 273
274 - 307
308 - 342
343 - 411
412 - 480
481 -
*When connecting PLFY-P08NBMU-E2, add 0.3 kg (10.6 oz) of refrigerant per indoor unit
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: 178.21 to 179oz)
HWE14080
) + (0.2 x L ) + (0.12 x L
1 2
' ) +(2.16 x L ' ) + (1.30 x L
1 2
) + (0.18 x L ) + (0.11 x L
1 2
' ) +(1.94 x L ' ) + (1.19 x L
1 2
L ': Length of ø19.05 [3/4"] liquid pipe [ft]
1
L ': Length of ø15.88 [5/8"] liquid pipe [ft]
2
L ': Length of ø12.7 [1/2"] liquid pipe [ft]
3
L ': Length of ø9.52 [3/8"] liquid pipe [ft]
4
L ': Length of ø6.35 [1/4"] liquid pipe[ft]
5
, ': Refer to the table below.
(kg) '(oz)
2.0 71
2.5 89
3.0 106
3.5 124 Single
4.5 159
5.0 177
6.0 212
8.0 283
9.0 318
10.0 353
12.0 424
Combination
14.0 494
- 128 -
P72 P96 P120
7.5 10.3 11.8
16-9 22-12 26-1
) + (0.06 x L ) + (0.024 x L
3 4
' ) + (0.65 x L ' ) + (0.26 x L
3 4
) + (0.054 x L ) + (0.021 x L
3 4
' ) + (0.58 x L ' ) + (0.23 x L
3 4
Outdoor unit total index
P72 model
P96 model
P120 model
P144 model
P168 model
P144 model
P168 model
P192 model
P216 model
P240 model
P264 model
P288 model
P312 model
P336 model
P360 model
P144 P168
11.8 11.8
26-1 26-1
) + +
5
' ) + '+ '
5
) + +
5
' ) + '+ '
5
Amount of refrigerant to
be charged to outdoor
units on site
(kg) ' (oz)
0.0 0
0.0 0
1.0 35
1.0 35
2.0 71
0.0 0
0.0 0
0.0 0
1.0 35
2.0 71
1.0 35
1.0 35
2.0 71
2.0 71
3.0 106
GB