Mitsubishi Electric BDT CITY MULTI Installation And Pre-Commissioning Booklet page 54

0000003417.BOOK 105 ページ ２０１４年１０月２２日 水曜日 午前１０時３５分
3. Piping Design
ADDITIONAL REFRIGERANT CALCULATIONS (R2 SERIES) example
3-3. Refrigerant charging calculation
PURY-P-YLM
Sample connection (with 3 BC controller and 6 indoor units) (PURY-P700YSLM-A)
OU
(Main unit)
H
F
Reducer (P15-P50)
(attached with BC controller)
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)
<Amount of additional refrigerant to be charged>
Calculating the amount of additional refrigerant to be charged
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 High-pressure pipe
additional = ø28.58 total length
charge (kg) × 0.36 (kg/m)
Liquid pipe ø12.7
+ total length
× 0.12 (kg/m)
+
Number of sub BC
+
Single
+
Combination
54
OU
(Sub unit)
Outdoor Twinning kit
G
A
BC controller (Main BC)
a
Joint kit
b
IU
IU
2 : P250
1 : P50
High-pressure pipe
+ ø22.2 total length
× 0.23 (kg/m)
Liquid pipe ø9.52
+ total length
× 0.06 (kg/m)
Amount
Total capacity of
(to be added for standard or
outdoor units
main BC controller)
P200 3.0kg
P250 4.5kg
P300 4.5kg
P350–900 6.0kg
Amount
(to be added for sub
controllers
BC controller)
1 1.0kg
2 2.0kg
Outdoor unit model
P200 to P250YLM
P300 to P350YLM
P400 to P550YSLM
P600 to P800YSLM
P850YSLM
P900YSLM
Joint D
C
E
Joint
B
c d
IU IU
3 : P15 4 : P20
High-pressure pipe High-pressure pipe
+ ø19.05 total length + ø15.88 total length
× 0.16 (kg/m) × 0.11 (kg/m)
Liquid pipe ø6.35
+ total length
× 0.024 (kg/m)
Main BC controller
+
HA-type
Amount
Total capacity of connected
(to be added for
indoor units
indoor unit)
80 or below
81 to 160
161 to 330
331 to 390
391 to 480
+
481 to 630
631 to 710
711 to 800
801 to 890
891 to 1070
1071 to 1250
1251 or above
Amount
(to be added for
outdoor unit)
0kg
0kg
0kg
0kg
5.5kg
11.0kg
IU
e
5 : P140
BC controller (Sub BC)
BC controller (Sub BC)
f
IU
6 : P200
Liquid pipe ø15.88
+ total length
× 0.2 (kg/m)
Amount
2.0kg
2.0kg
2.5kg
3.0kg
3.5kg
4.5kg
5.0kg
6.0kg
8.0kg
9.0kg
10.0kg
12.0kg
14.0kg
AN1 2nd