Mitsubishi Electric PUHY-P120YHMU-A, Service Manual

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[
VIII
Test Run Mode ]
- 118 - HWE0804A GB
3. 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.
(1) Calculation formula
The amount of refrigerant to be added depends on the size and the length of field piping. (unit in m[ft])
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
Q\ to 179oz)
Outdoor unit model P72 P96 P120
Amount of pre-charged refrigerant in
the outdoor unit (kg)
9.0 9.0 11.5
Amount of pre-charged refrigerant in
the outdoor unit [lbs-oz]
19-13 19-13 25-6
Amount of added refrigerant (kg) = (0.29x L
1
) + (0.2 x L
2
) + (0.12 x L
3
) + (0.06 x L
4
) + (0.024 x L
5
) +
ǩ
Amount of added refrigerant (oz) = (3.12x L
1
' ) +(2.15 x L
2
' ) + (1.29 x L
3
' ) + (0.65 x L
4
' ) + (0.26 x L
5
' ) +
ǩ
L
1
: Length of ø19.05 [3/4"] liquid pipe (m)
L
2
: Length of ø15.88 [5/8"] liquid pipe (m)
L
3
: Length of ø12.7 [1/2"] liquid pipe (m)
L
4
: Length of ø9.52 [3/8"] liquid pipe (m)
L
5
: Length of ø6.35 [1/4"] liquid pipe (m)
ǩ
,
ǩ
' : Refer to the table below.
L
1
' : Length of ø19.05 [3/4"] liquid pipe [ft]
L
2
' : Length of ø15.88 [5/8"] liquid pipe [ft]
L
3
' : Length of ø12.7 [1/2"] liquid pipe [ft]
L
4
' : Length of ø9.52 [3/8"] liquid pipe [ft]
L
5
' : Length of ø6.35 [1/4"] liquid pipe[ft]
Total capacity of
connected indoor units
ǩ
(kg)
ǩ
'(oz)
- 27 2.0 71
28 - 54 2.5 89
55 - 126 3.0 106
127 - 144 3.5 124
145 - 180 4.5 159
181 - 234 5.0 177
235 - 273 6.0 212
274 - 307 8.0 283
308 - 342 9.0 318
343 - 411 10.0 353
412 - 480 12.0 424
481 - 14.0 494