Mitsubishi Electric BDT CITY MULTI, Installation And Pre-Commissioning Booklet

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54
ADDITIONAL REFRIGERANT CALCULATIONS (R2 SERIES) example
4 - 105
3. Piping Design
AN1 2nd
S.D. R2
MEE14K009
3-3. Refrigerant charging calculation
Sample connection (with 3 BC controller and 6 indoor units) (PURY-P700YSLM-A)
<Amount of additional refrigerant to be charged>
Calculating the amount of additional refrigerant to be charged
BC controller (Main BC)
IU
a
IU
C
b
IU
1 : P50
2 : P250
Joint kit
IU
Joint
BC controller (Sub BC)
BC controller (Sub BC)
B
c d
IU
f
D
E
Joint
A
IU
e
F
H
OU
(Main unit) OU
(Sub unit)
Reducer (P15-P50)
(attached with BC controller)
G
3 : P15 4 : P20
5 : P140
6 : P200
Amount of additional refrigerant to be charged
Refrigerant for extended pipes (field piping) is not factory-charged to the outdoor unit. Add an appropriate amount of refrigerant for each pipes on site.
Record the size of each high pressure pipe and liquid pipe, and the amout of refrigerant that was charged on the outdoor unit for future reference.
Calculating the amount of additional refrigerant to be charged
The amount of refrigerant to be charged is calculated with the size of the on-site-installed hige pressure pipes and liquid pipes, and their length.
Calculate the amount of refrigerant to be charged according to the formula below.
Round up the calculation result to the nearest 0.1kg. (i.e., 16.03 kg = 16.1 kg)
Outdoor Twinning kit
PURY-P-YLM
Units "m" and "kg" (In an R2 system)
<Formula>
• When the piping length from the outdoor unit to the farthest indoor unit is 30.5 m (100 ft) or shorter
Amount of
additional
charge (kg)
=
High-pressure pipe
ø28.58 total length
× 0.36 (kg/m)
+
High-pressure pipe
ø22.2 total length
× 0.23 (kg/m)
+
High-pressure pipe
ø19.05 total length
× 0.16 (kg/m)
+
High-pressure pipe
ø15.88 total length
× 0.11 (kg/m)
+
Liquid pipe ø15.88
total length
× 0.2 (kg/m)
+
Liquid pipe ø12.7
total length
× 0.12 (kg/m)
+
Liquid pipe ø9.52
total length
× 0.06 (kg/m)
+
Liquid pipe ø6.35
total length
× 0.024 (kg/m)
+
Total capacity of
outdoor units
Amount
(to be added for standard or
main BC controller)
+
Main BC controller Amount
P200 3.0kg HA-type 2.0kg
P250 4.5kg
P300 4.5kg
P350–900 6.0kg
+
Number of sub BC
controllers
Amount
(to be added for sub
BC controller)
+
Total capacity of connected
indoor units
Amount
(to be added for
indoor unit)
1 1.0kg 80 or below 2.0kg
2 2.0kg 81 to 160 2.5kg
161 to 330 3.0kg
331 to 390 3.5kg
391 to 480 4.5kg
481 to 630 5.0kg
631 to 710 6.0kg
711 to 800 8.0kg
801 to 890 9.0kg
891 to 1070 10.0kg
1071 to 1250 12.0kg
1251 or above 14.0kg
+
Outdoor unit model
Amount
(to be added for
outdoor unit)
Single
P200 to P250YLM 0kg
P300 to P350YLM 0kg
Combination
P400 to P550YSLM 0kg
P600 to P800YSLM 0kg
P850YSLM 5.5kg
P900YSLM 11.0kg
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