Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 194

4. Amount of refrigerant to be added <PURY>
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 re-
frigerant in the outdoor unit
(kg[lbs-oz])
Outdoor unit model
Amount of pre-charged re-
frigerant in the outdoor unit
(kg[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])
Amount of added refrigerant (kg) = (0.36 x L
+ (0.11 x L ) + (0.12 x L
5
Amount of added refrigerant (oz) = (390 x L
+ (1.18 x L ' ) + (1.29x L
5
L : Length of ø28.58[1-1/8"] high-pressure pipe (m)
1
L : Length of ø25.4[1"] high-pressure pipe (m)
2
L : Length of ø22.2[7/8"] high-pressure pipe (m)
3
L : Length of ø19.05[3/4"] high-pressure pipe (m)
4
L : Length of ø15.88[5/8"] high-pressure pipe (m)
5
L : Length of ø12.7[1/2"] liquid pipe (m)
6
L : Length of ø9.52[3/8"] liquid pipe (m)
7
L : Length of ø6.35[1/4"] liquid pipe (m)
8
, α ' : Refer to the table below.
α
1 1
Total capacity of
connected indoor units
- 30
31 - 60
61 - 126
127 - 180
181 - 234
235 - 264
265 - 366
367 - 468
Round up the calculation result to the nearest 0.01kg. (Example: 15.78g to 15.8kg)
Round up the calculation result in increments of 4oz (0.1kg) or round it up to the nearest 1oz.
(Example: 552.5oz to 556oz or 553oz)
P72 P96
10.5[23-3] 13.5[28-11]
P168 P192
22.0[48-9] 22.0[48-9]
) + (0.31 x L ) + (0.23 x L
1 2
) + (0.06 x L ) + (0.024 x L
6 7 8
' ) + (3.33 x L
1 2
' ) + (0.65 x L ' ) + (0.26 x L
6 7
(kg) '(oz)
α α
1 1
1.0 36
1.5 53
2.0 71
2.5 89
3.0 106
4.0 142
5.0 178
6.0 212
- 185 -
P108 P126
13.5[28-11] 16.5[36-7]
P204 P216
22.0[48-9] 22.0[48-9]
) + (0.16 x L )
3 4
) + α + α
1 2
' ) + (2.47 x L ' ) + (1.72 x L
3 4
' ) + α ' + α '
8 1 2
L ' : Length of ø28.58[1-1/8"] high-pressure pipe [ft]
1
L ' : Length of ø25.4[1"] high-pressure pipe [ft]
2
L ' : Length of ø22.2[7/8"] high-pressure pipe [ft]
3
L ' : Length of ø19.05[3/4"] high-pressure pipe [ft]
4
L ' : Length of ø15.88[5/8"] high-pressure pipe [ft]
5
L ' : Length of ø12.7[1/2"] liquid pipe [ft]
6
L ' : Length of ø9.52[3/8"] liquid pipe [ft]
7
L ' : Length of ø6.35[1/4"] liquid pipe [ft]
8
, α ' : Refer to the table below.
α
2 2
Total number of
sub BC controllers
1
2
[ VIII Test Run Mode ]
P144
16.5[36-7]
P234
22.0[48-9]
' )
(kg) '(oz)
α α
2 2
1.0 36
2.0 71