Refrigerant Piping System; Additional Refrigerant Charge; Calculation Of Additional Refrigerant Charge - Mitsubishi Electric City Multi PURY-RP200YJM Installationshandbuch

• Do not use the tools shown below used with conventional refrigerant.
(Gauge manifold, charge hose, gas leak detector, check valve,
refrigerant charge base, vacuum gauge, refrigerant recovery
equipment)
- Mixing of conventional refrigerant and refrigerant oil may cause the
refrigerant oil to deteriorate.
- Mixing of water will cause the refrigerant oil to deteriorate.
- R410A refrigerant does not contain any chlorine. Therefore, gas leak
detectors for conventional refrigerants will not react to it.
• Manage the tools used for R410A more carefully than normal.
- If dust, dirt, or water gets in the refrigerant cycle, the refrigerant oil will
deteriorate.
• Store the piping to be used during installation indoors and keep both
ends of the piping sealed until just before brazing.
- If dust, dirt, or water gets into the refrigerant cycle, the oil will deteriorate
and the compressor may fail.
• Do not use a charging cylinder.
- Using a charging cylinder may cause the refrigerant to deteriorate.
• Do not use special detergents for washing piping.

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 ø19.05
=
×0.16
(kg) (m)×0.16(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
+
RP200 2.0kg
RP250
3.0kg
RP300
<Example>
Indoor 1: 100 A: ø19.05 40 m
2: 50 a: ø9.52 10 m
3: 40 b: ø9.52 5 m
4: 32 c: ø6.35 5 m
d: ø6.35 3 m
High-pressure
pipe size
Total length of ø15.88
+
×0.11
(m)×0.11(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

9.2. Refrigerant piping system

Connection example
[Fig. 9.2.1] (P.3, 4)
Outdoor model
Low-pressure side
Liquid pipe
Model number
A Outdoor unit
C BC controller (main)
E Indoor unit (15 ~ 80)
*1 ø25.4 for R22
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.
Total Capacity of
Connected Indoor Units
~80
+ 81~160
161~330
331~390
391~
The total length of each liquid line is as follows:
ø19.05: A = 40 m
ø9.52: a + b = 15 m
ø6.35: c + d = 8 m
Therefore,
<Calculation example>
Additional refrigerant charge
= 40 × 0.16 + 15 × 0.06 + 8 × 0.024 + 2 + 3
= 12.5 kg
High-pressure side
Total capacity of indoor units
Gas pipe
B BC controller (standard)
D BC controller (sub)
F Indoor unit (100 ~ 250)
Per Indoor
Unit
2.0kg
2.5kg
3.0kg
3.5kg
4.5kg
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