Refrigerant Charging Calculation - Mitsubishi Electric PQRY-P72TLMU-A Manual

12. PIPING DESIGN

12-3. Refrigerant Charging Calculation

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