4.10 Calculation of Amount Refrigerant
• The calculation of the additional charge should take into account the length of pipe and CF(correction Factor) value of
indoor units.
• Please refer to the indoor unit’s PDB or the outdoor/outside unit’s installation manual for the additional refrigerant table of
indoor units.
Additional charge (kg) = Total length (m) of Liquid pipe : Ø25.4 mm (1 inch) x 0.422 (kg/m)
+ Total length (m) of Liquid pipe : Ø22.2 mm (7/8 inch) x 0.313 (kg/m)
+ Total length (m) of Liquid pipe : Ø19.05 mm (3/4 inch) x 0.235 (kg/m)
+ Total length (m) of Liquid pipe : Ø15.88 mm (5/8 inch) x 0.153 (kg/m)
+ Total length (m) of Liquid pipe : Ø12.7 mm (1/2 inch) x 0.103 (kg/m)
+ Total length (m) of Liquid pipe : Ø9.52 mm (3/8 inch) x 0.053 (kg/m)
+ Total length (m) of Liquid pipe : Ø6.35 mm (1/4 inch) x 0.019 (kg/m)
+ Number of installed HR units(2,3,4 port) x 0.450 (kg/m)*
+ Number of installed HR units(6,8 port) x 0.900 (kg/m)*
+ CF value of indoor unit(kg/EA)
* : For Heat Recovery System Only
Installation of Outdoor Unit
4. Refrigerant Piping System
Installation
20
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