Mitsubishi Electric City Multi CMB-P1016NU-G, Service Handbook

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[
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.
(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: 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)
Heat source unit model P72 P96
Amount of pre-charged re-
frigerant in the heat source
unit (kg[lbs-oz])
7.5[16-9] 8.5[18-12]
Amount of added refrigerant (kg) = (0.16 x L
4
) + (0.11 x L
5
) + (0.12 x L
6
) + (0.06 x L
7
) + (0.024 x L
8
) +
α
1
+
α
2
Amount of added refrigerant (oz) = (1.72 x L
4
' ) + (1.18 x L
5
' ) + (1.29x L
6
' ) + (0.65 x L
7
' ) + (0.26 x L
8
' ) + α
1
' + α
2
'
L
4
: Length of ø19.05[3/4"] high-pressure pipe (m)
L
5
: Length of ø15.88[5/8"] high-pressure pipe (m)
L
6
: Length of ø12.7[1/2"] liquid pipe (m)
L
7
: Length of ø9.52[3/8"] liquid pipe (m)
L
8
: Length of ø6.35[1/4"] liquid pipe (m)
α
1
, α
1
' : Refer to the table below.
L
4
' : Length of ø19.05[3/4"] high-pressure pipe [ft]
L
5
' : Length of ø15.88[5/8"] high-pressure pipe [ft]
L
6
' : Length of ø12.7[1/2"] liquid pipe [ft]
L
7
' : Length of ø9.52[3/8"] liquid pipe [ft]
L
8
' : Length of ø6.35[1/4"] liquid pipe [ft]
α
2
, α
2
' : Refer to the table below.
Total capacity of
connected indoor units
α
1
(kg) α
1
'(oz)
Total number of
sub BC controllers
α
2
(kg) α
2
'(oz)
- 30 1.0 36 1 1.0 36
31 - 60 1.5 53 2 2.0 71
61 - 126 2.0 71
127 - 180 2.5 89