Additional Refrigerant Charge; Calculation Of Additional Refrigerant Charge - Mitsubishi Electric CITY MULTI PQHY-P200YHM-A Manuel D'installation

10. Additional refrigerant charge

At the time of shipping, the heat source 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 heat source unit.
For PQHY-P·Y(S)HM-A
<Additional Charge>
Additional Liquid pipe size
refrigerant charge Total length of
=
ø19.05 × 0.29
(kg) (m) × 0.29 (kg/m)
Liquid pipe size
Total length of
+
ø9.52 × 0.06
(m) × 0.06 (kg/m)
<Example>
Indoor 1: 125 A: ø12.7 40 m
2: 100 B: ø9.52 10 m
3: 40 C: ø9.52 15 m
4: 32 D: ø9.52 10 m
5: 63
The total length of each liquid line is as follows:
ø12.7: A = 40 = 40 m
ø9.52: B + C + D + a + b + e = 10 + 15 + 10 + 10 + 5 + 10 = 60 m
ø6.35: c + d = 10 + 10 = 20 m
Therefore,
<Calculation example>
Additional refrigerant charge
= 40 × 0.12 + 60 × 0.06 + 20 × 0.024 + 2.5 = 11.4 kg
Value of α
Total capacity of connecting indoor units
Models ~ 80
Models 81 ~ 160
Models 161 ~ 330
Models 331 ~ 390
Models 391 ~ 480
Models 481 ~ 630
Models 631 ~ 710
Models 711 ~
Limitation of the amount of refrigerant to be charged (for PQRY-P·Y(S)HM-A only)
The above calculation result of the amount of refrigerant to be charged must become below the value in the table below.
Heat source unit model
Maximum amount of refrigerant kg
*1
*1: Amount of additional refrigerant to be charged on site
22
Liquid pipe size Liquid pipe size
Total length of Total length of
+
+
ø15.88 × 0.2 ø12.7 × 0.12
(m) × 0.2 (kg/m) (m) × 0.12 (kg/m)
Liquid pipe size
Total length of
+ + α
ø6.35 × 0.024
(m) × 0.024 (kg/m)
a: ø9.52 10 m
b: ø9.52 5 m At the
c: ø6.35 10 m conditions
d: ø6.35 10 m below:
e: ø9.52 10 m
α
2.0 kg
2.5 kg
3.0 kg
3.5 kg
4.5 kg
5.0 kg
6.0 kg
8.0 kg
P200 P250 P300
26.3 32.8 33.8
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 27.73 kg, round the
result up to 27.8 kg.
For PQRY-P·Y(S)HM-A
<Additional charge>
Additional High-pressure
refrigerant charge pipe size
= Total length of
ø28.58 × 0.36
(kg) (m) × 0.36 (kg/m)
High-pressure
pipe size
+
Total length of
ø15.88 × 0.11
(m) × 0.11 (kg/m)
Liquid Piping Size
Total length of
+
ø9.52 × 0.06
(m) × 0.06 (kg/m)
BC controller
(Standard/Main)
+
3.0kg
Total Capacity of Connected
Indoor Units
~80
81~160
161~330
+
331~390
391~480
481~630
631~710
711~800
801~890
891~
<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
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 + 2 + 2 + 5
= 27.8 kg
P400 P450 P500
45.5 47.0 58.2
High-pressure High-pressure
pipe size pipe size
+
Total length of + Total length of
ø22.2 × 0.23 ø19.05 × 0.16
(m) × 0.23 (kg/m) (m) × 0.16 (kg/m)
Liquid Piping Size Liquid Piping Size
Total length of Total length of
+
+
ø15.88 × 0.2 ø12.7 × 0.12
(m) × 0.2 (kg/m) (m) × 0.12 (kg/m)
Liquid Piping Size
Total length of
+
ø6.35 × 0.024
(m) × 0.024 (kg/m)
BC controller
BC controller
(Sub) Total Units
(Sub) Per Unit
+
1
1.0 kg
2
2.0 kg
Per Indoor Unit
2.0kg
2.5kg
3.0kg
3.5kg
4.5kg
5.0kg
6.0kg
8.0kg
9.0kg
10.0kg
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
P550 P600
67.2 70.9