Additional Refrigerant Charge; Calculation Of Additional Refrigerant Charge - Mitsubishi Electric City Multi PURY-EP-YJM-A Installation Manual

10. Additional refrigerant charge

At the time of shipping, the outdoor unit is charged with refrigerant.
This charge does not include the amount needed for extended piping and
additional charging of each refrigerant line will be required on site. In order that
future servicing may be properly provided, always keep a record of the size and
length of each refrigerant line and the amount of additional charge by writing it in
the space provided on the outdoor unit.
<Additional charge>
High-pressure
Additional refrigerant pipe size
charge Total length of ø28.58
=
×0.36
(kg) (m)×0.36(kg/m)
Liquid Piping Size Liquid Piping Size
Total length of ø12.7 Total length of ø9.52
+ +
×0.12 ×0.06
(m)×0.12(kg/m) (m)×0.06(kg/m)
BC controller
Total Outdoor Unit
(Standard/Main)
Model Name
Per Unit
+ (E)P200 2.0kg
(E)P250~(E)P500 3.0kg
(E)P550~(E)P900 5.0kg
<Example>
Indoor 1: 80 A: ø28.58 40 m
2: 250 B: ø9.52 10 m
3: 32 C: ø9.52 20 m
4: 40 D: ø9.52 5 m
5: 32 E: ø9.52 5 m
6: 63 F: ø22.2 3 m
G: ø19.05 1 m
Outdoor P550
• Limitation of the amount of refrigerant to be charged
The above calculation result of the amount of refrigerant to be charged must become below the value in the table below.
Outdoor unit model P200 P250
Maximum amount of
24.8kg 33.8kg
refrigerant *1 kg
Outdoor unit model EP200 EP250
Maximum amount of
27.3kg 34.0kg
refrigerant *1 kg
*1 Amount of additional refrigerant to be charged on site
High-pressure
pipe size
Total length of ø22.2 Total length of ø19.05
+ +
×0.23
(m)×0.23(kg/m)
Liquid Piping Size
Total length of ø6.35
+
×0.024
(m)×0.024(kg/m)
BC controller
(Main) HA-type
+ +
2.0 kg
a: ø9.52 10 m
b: ø9.52 5 m
c: ø6.35 5 m At the
d: ø6.35 10 m conditions
e: ø6.35 5 m
below:
f: ø9.52 5 m
P300 P350 P400 P450
34.8kg 39.7kg 46.7kg 53.7kg
EP300 EP350 EP400 EP450
35.0kg 39.7kg 47.5kg 49.2kg
10.1. Calculation of additional refrigerant
charge
• Calculate the amount of additional charge based on the length of the piping
extension and the size of the refrigerant line.
• Use the table below as a guide for calculating the amount of additional
charging and then charge the system accordingly.
• If the calculation results in a fraction of less than 0.1 kg, round up to the next
0.1 kg. For example, if the result of the calculation was 30.73 kg, round the
result up to 30.8 kg.
High-pressure High-pressure
pipe size pipe size
Total length of ø15.88
+
×0.16 ×0.11
(m)×0.16(kg/m) (m)×0.11(kg/m)
BC controller BC controller
(Sub) Total Units (Sub) Per Unit
1 1.0 kg
2 2.0 kg
The total length of each liquid line is as follows:
ø28.58: A = 40 m
ø22.2: F = 3 m
ø19.05: G = 1 m
ø9.52: C + D + E + a + b + f = 50 m
ø6.35: c + d + e = 20 m
Therefore,
<Calculation example>
Additional refrigerant charge
= 40 × 0.36 + 3 × 0.23 + 1 × 0.16 + 50 × 0.06 + 20 × 0.024 + 5 + 2 + 5
= 30.8 kg
P500 P550 P600 P650
60.2kg 69.2kg 72.9kg 74.6kg
EP500 EP550 EP600 EP650
62.9kg 69.6kg 73.3kg 74.8kg
Liquid Piping Size
Total length of ø15.88
+
×0.2
(m)×0.2(kg/m)
Total Capacity of Per Indoor
Connected Indoor Units Unit
~80 2.0kg
+ 81~160 2.5kg
161~330 3.0kg
331~390 3.5kg
391~480 4.5kg
481~630 5.0kg
631~710 6.0kg
711~800 8.0kg
801~890 9.0kg
891~1070 10.0kg
1071~1250 12.0kg
1251~ 14.0kg
P700 P750 P800 P850
90.3kg 91.5kg 91.5kg 91.5kg
EP700
74.8kg
P900
91.5kg
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