15
Packaged and Split Rooftop Ventilator
Split DX Refrigerant Charge Calculation
At the time of shipping, the outdoor air unit is charged with refrigerant. As this charge does not include the amount
needed for extended piping, additional charging for the refrigerant lines will be required on site. In order that future
servicing may be properly provided, always keep a record of the size and length of the refrigerant lines and the
amount of additional charge by writing it in the space provided on the condensing unit.
Calculation of the Additional Refrigerant Charge
• Calcuate the amount of additional charge based on the length of the piping and the size of the refrigerant line.
• Use the table below as a guide to calculate the amount of additional charge and add this amount to the system.
• If the calculation results in a fraction of less than 0.1kg [4 oz], round up to the next 0.1kg [4 oz]. For example, if the
result of the calculation was 12.38 kg [436.4 oz], round the result to up to 12.4 kg [437 oz].
<Additional Charge>
TOTAL
additional
refrigerant
charge
=
Total length of liquid
pipe sized 15.88
[
5
⁄
8
in.]
+
Total length of liquid
pipe sized 12.70
[
1
⁄
2
in.]
+
Total length of liquid
pipe sized 9.52
[
3
⁄
8
in.]
+
Additional Charge for OD Unit
+
DOAS
Charge
Outdoor Unit
Amount
PUHY-P96
2 kg [71 oz]
(kg)
(oz)
(m) x 0.20 (kg/m)
(ft.) x 2.16 [oz/ft.]
(m) x 0.12 (kg/m)
(ft.) x 1.3 [oz/ft.]
(m) x 0.06 (kg/m)
(ft.) x 0.65 [oz/ft.]
PUHY-P144
8 kg [283 oz]
PUHY-P192
8 kg [283 oz]
PUHY-P240
16 kg [566 oz]
DOAS Charge Amount
Model Number
Charge Amount
MPF-1-**-**-96-1
5.5 kg
194 oz
MPF-1-**-**-144-1
5.5 kg
194 oz
MPF-2-**-**-144-1
5.6 kg
198 oz
MPF-2-**-**-192-1
18.8 kg
663 oz
MPF-2-**-**-240-1
18.8 kg
663 oz
Amount of Factory Charged Refrigerant
(reference only)
Outdoor Unit
Model
Liquid
Line (in.)
Charge Amount
PUHY-P96
1
⁄
2
11.5 kg
[406 oz]
PUHY-P144
1
⁄
2
11.8 kg
[417 oz]
PUHY-P192
5
⁄
8
20.8 kg
[735 oz]
PUHY-P240
5
⁄
8
23.6 kg
[834 oz]
OU
DOAS
A
42' Total Piping Length
1/2" Liquid Line
Example: MPF-1-**-**-96 DOAS with PUHY-P96 Outdoor Unit
TOTAL
additional
refrigerant
charge
=
Total length of liquid
pipe sized 12.70
[
1
⁄
2
in.]
+
Additional Charge for
OU Unit
+
DOAS
Charge
Outdoor Unit
Amount
PUHY-P96 2 kg [71 oz]
(m) x 0.12 (kg/m)
(ft.) x 1.3 [oz/ft.]
PUHY-P144 8 kg [283 oz]
oz
PUHY-P192 8 kg [283 oz]
PUHY-P240 16 kg [566 oz]
TOTAL
additional
refrigerant
charge
=
42’ x 1.30 [oz/ft.]
55 oz
+
71 oz
+ 179 oz
305 oz
© 2017 Mitsubishi Electric US, Inc.
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