PQRY-P-T(S)LMU, Y(S)LMU (April 2017 Ver2)
WR2-143
© 2017 Mitsubishi Electric US, Inc.
12. PIPING DESIGN
Sample connection (with 3 BC controller and 6 indoor units)
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[4oz]. (i.e., 16.08 kg = 16.1 kg)
<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 : P18
2 : P96
CMY-R160-J1
(Joint)
IU
CMY-Y102SS-G
(Joint)
BC controller (Sub BC)
BC controller (Sub BC)
B
c
d
IU
f
D
E
CMY-Y202S-G2
CMY-Y102LS-G2
CMY-Y102SS-G2
(Joint)
A
IU
e
F
H
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.
HU
(Main unit)
HU
(Sub unit)
G
3 : P06
4 : P08
5 : P54
6 : P72
+
BC controller
(Main) HA-Type
2.0 kg[71oz]
+
BC controller
(Standard / Main)
3.0 kg[106oz]
+
BC controller
(Sub) Total Units
1
2
Charged amount
1.0 kg[36oz]
2.0 kg[71oz]
+
Additional charge
Heat source unit model
Charged amount
+
Total Capacity of
Connected Indoor Units
Models 28 ~ 54
Models 55 ~ 126
Models 127 ~ 144
Models 145 ~ 180
Models 181 ~ 234
Models 235 ~ 273
Models 274 ~ 307
Models 308 ~ 342
Models 343 ~ 411
Models 412 ~
Models ~ 27
Charged amount
2.0 kg [71 oz]
2.5 kg [89 oz]
3.0 kg [106 oz]
3.5 kg [124 oz]
4.5 kg [159 oz]
5.0 kg [177 oz]
6.0 kg [212 oz]
8.0 kg [283 oz]
9.0 kg [318 oz]
10.0 kg [353 oz]
12.0 kg [424 oz]
• Piping length from heat source unit to the most farthest indoor unit ≤ 30.5 m [100 ft] use the table [A]
• Piping length from heat source unit to the most farthest indoor unit > 30.5 m [100 ft] use the table [B]
Additional refrigerant
charge
(kg) [oz]
(kg) [oz]
[A]
[B]
[A]
[B]
[A]
[B]
[A]
[B]
[A]
[B]
[A]
[B]
[A]
[B]
=
High pressure
pipe size
Total length of
ø 28.58mm [1-1/8 in]
(m) × 0.36 (kg/m)
(ft) × 3.88 (oz/ft)
(m) × 0.33 (kg/m)
(ft) × 3.55 (oz/ft)
(m) × 0.16 (kg/m)
(ft) × 1.73 (oz/ft)
(m) × 0.14 (kg/m)
(ft) × 1.51 (oz/ft)
(m) × 0.23 (kg/m)
(ft) × 2.48 (oz/ft)
(m) × 0.21 (kg/m)
(ft) × 2.26 (oz/ft)
High pressure
pipe size
Total length of
ø 22.2mm [7/8 in]
High pressure
pipe size
Total length of
ø 19.05mm [3/4 in]
+
+
(m) × 0.20 (kg/m)
(ft) × 2.16 (oz/ft)
(m) × 0.18 (kg/m)
(ft) × 1.94 (oz/ft)
+
Liquid Piping size
Total length of
Single
P216
P240
1.0 kg
1.0 kg
ø 15.88mm [5/8 in]
(m) × 0.12 (kg/m)
(ft) × 1.30 (oz/ft)
(m) × 0.11 (kg/m)
(ft) × 1.19 (oz/ft)
+
Liquid Piping size
Total length of
ø 12.7mm [1/2 in]
(m) × 0.06 (kg/m)
(ft) × 0.65 (oz/ft)
(m) × 0.054 (kg/m)
(ft) × 0.59 (oz/ft)
+
Liquid Piping size
Total length of
ø 9.52mm [3/8 in]
[A]
[B]
[A]
[B]
(m) × 0.11 (kg/m)
(ft) × 1.19 (oz/ft)
(m) × 0.10 (kg/m)
(ft) × 1.08 (oz/ft)
High pressure
pipe size
Total length of
ø 15.88mm [5/8 in]
+
(m) × 0.024 (kg/m)
(ft) × 0.26 (oz/ft)
(m) × 0.021 (kg/m)
(ft) × 0.23 (oz/ft)
+
Liquid Piping size
Total length of
ø 6.35mm [1/4 in]
12-3. Refrigerant Charging Calculation
