3-3.Refrigerant Charging Calculation - Mitsubishi Electric PQHY-P200-900Y(S)LM-A Data Book

3. Piping Design
3-3. Refrigerant charging calculation
Sample connection (with 3 BC controller and 6 indoor units) (PQRY-P700YSLM)
HU
HU
(Main unit)
(Sub unit)
H
F
G
* Refer to the
installation manual for
the connection.
Amount of additional refrigerant to be charged
Refrigerant for extended pipes (field piping) is not factory-charged to the heat source 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 heat source 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 high 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"
<Formula>
• When the piping length from the heat source 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)
BC controller
+
Standard/Main
Number of sub BC
controllers
+
1
2
Heat source unit model
+
Single
MEE15K036
Heat source Twinning kit (High/Low press.)
CMY-Q100CBK2, CMY-Q200CBK:
The Low press. kit must be placed in the heat source unit that has a larger capacity index
of the two, regardless of the relative positions of the heat source units or their addresses.
(If heat source units that have the same capacity are used in combination, the distributor
can be placed in either heat source unit.)
The High press. kit is to be installed in the field.
A
BC controller (Main BC)
C
Joint
B
a
Joint kit
b
IU
IU
2 : P250
1 : P50
High-pressure pipe High-pressure pipe
+ ø22.2 total length + ø19.05 total length
× 0.23 (kg/m) × 0.16 (kg/m)
Liquid pipe ø9.52 Liquid pipe ø6.35
+ total length + total length
× 0.06 (kg/m) × 0.024 (kg/m)
Amount
(to be added for standard or
main BC controller)
3.0kg
Amount
Total capacity of connected
(to be added for sub
BC controller)
1.0kg
2.0kg
+
Amount
(to be added for
heat source unit)
P550 1.0kg
P600 1.0kg
BC controller (Sub BC)
Joint
D
BC controller (Sub BC)
E
c d
IU IU
3 : P15 4 : P20
High-pressure pipe
+ ø15.88 total length
× 0.11 (kg/m)
Main BC controller Amount
+
HA-type 2.0kg
Amount
(to be added for
indoor units
indoor unit)
80 or below 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
SYSTEM DESIGN
IU
e
5 : P140
f
IU
6 : P200
Liquid pipe ø15.88
+ total length
× 0.2 (kg/m)
233