Additional Refrigerant Charge; Calculation Of Additional Refrigerant Charge - Mitsubishi Electric CITY MULTI PURY-P72TJMU-A Installation Manual

<C> Pipe connection example
The distributor on the low-pressure side must be placed in the outdoor unit that has a larger capacity index of the two, regardless of the relative positions of the
outdoor units or their addresses.
(If outdoor units that have the same capacity are used in combination, the distributor can be placed in either outdoor unit.)
If the distributor is placed in the outdoor unit that has a smaller capacity, refrigerant will not be properly distributed and compressor failure may result.
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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>
Additional refrigerant
charge
=
ø28.58 mm [1-1/8 in]
(m) × 0.36 (kg/m)
(kg) [oz]
(ft) × 3.88 (oz/ft)
Liquid Piping Size Liquid Piping Size
Total length of
+ ø15.88 mm [5/8 in] + ø12.7 mm [1/2 in]
(m) × 0.2 (kg/m) (m) × 0.12 (kg/m)
(ft) × 2.16 (oz/ft) (ft) × 1.30 (oz/ft)
Total Outdoor BC controller
Unit (Standard/Main)
+
Model Name Per Unit
P72 3.0 kg [106 oz]
P96
P120 4.5 kg [160 oz]
P144
P168 7.5 kg [265 oz]
P192
P216
P240 9.0 kg [318 oz]
P264
P288
Maximum refrigerant charge
There is a limit to the amount of refrigerant that can be charged into a unit. Regardless of the amount yielded by the formula above, observe the maximum refrigerant
charge in the table below.
Total index of the
P72
outdoor units
Maximum *1 39.0kg
refrigerant charge [86LBS] [104LBS 3oz]
*1 Maximum refrigerant charge: the amount of factory-charged refrigerant and the amount of refrigerant to be added on site
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High-pressure High-pressure
pipe size pipe size
Total length of Total length of
+
ø22.2 mm [7/8 in]
(m) × 0.23 (kg/m)
(ft) × 2.48 (oz/ft)
Liquid Piping Size
Total length of Total length of
+ ø9.52 mm [3/8 in]
(m) × 0.06 (kg/m)
(ft) × 0.65 (oz/ft)
BC controller
(Main) HA-Type
+ +
2.0 kg
P96 P120 P144
47.3kg 52.8kg 58.5kg
[116LBS 5oz] [129LBS]
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Twinning pipe (low-pressure side)
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On-site piping (low-pressure connecting pipe: between outdoor units)
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On-site piping (low-pressure main pipe: to BC controller)
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On-site piping (high-pressure main pipe: to BC controller)
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Straight run of pipe that is 500 mm [19-11/16 in] or more
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 [4 oz], round up
to the next 0.1 kg [4 oz]. For example, if the result of the calculation was
27.73 kg [979 oz], round the result up to 27.8 kg [983 oz].
High-pressure
pipe size
Total length of
+
ø19.05 mm [3/4 in]
(m) × 0.16 (kg/m)
(ft) × 1.73 (oz/ft)
Liquid Piping Size
Total length of
+ ø6.35 mm [1/4 in]
(m) × 0.024 (kg/m)
(ft) × 0.26 (oz/ft)
BC controller BC controller
(Sub) Total Units (Sub) Per Unit
1 1.0 kg [36 oz]
2 2.0 kg [71 oz]
P168 P192
73.0kg 86.3kg
[161LBS] [190LBS 3oz]
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Twinning pipe (high-pressure side)
High-pressure
pipe size
Total length of
+
ø15.88 mm [5/8 in]
(m) × 0.11 (kg/m)
(ft) × 1.19 (oz/ft)
Total Capacity of
Connected Indoor Per Indoor Unit
+
Units
Models ~ 27 2.0 kg [71 oz]
Models 28 ~ 54 2.5 kg [89 oz]
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]
Models 343 ~ 411 10.0 kg [353 oz]
Models 412 ~ 12.0 kg [424 oz]
P216 P240 P264
104.6kg 107.1kg 115.1kg
[230LBS 6oz] [236LBS 2oz] [253LBS 8oz]
P288
115.1kg
[253LBS 8oz]
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