Mitsubishi Electric City Multi PQHY-P72 Service Handbook page 171

[ VIII Test Run Mode ]
4. Amount of refrigerant to be added <PQRY>
The amount of refrigerant that is shown in the table below is factory-charged to the heat source units.
The amount necessary for extended pipe (field piping) is not included and must be added on site.
Heat source unit model
Amount of pre-charged re-
frigerant in the heat source
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) = (0.16 x L
Amount of added refrigerant (oz) = (1.72 x L
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
Round up the calculation result to the nearest 0.1kg. (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
7.5[16-9] 8.5[18-12]
) + (0.11 x L ) + (0.12 x L
4 5
' ) + (1.18 x L ' ) + (1.29x L
4 5
(kg) '(oz)
α α
1 1
1.0 36
1.5 53
2.0 71
2.5 89
- 162 -
) + (0.06 x L ) + (0.024 x L
6 7
' ) + (0.65 x L ' ) + (0.26 x L
6 7
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
) + α + α
8 1 2
' ) + α ' + α '
8 1 2
(kg) '(oz)
α α
2 2
1.0 36
2.0 71