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NOTE ON ADDING REFRIGERANT
CAUTION
DO NOT mix refrigerant types.
Some systems require additional charging depending on pipe lengths. In North America, the standard
pipe length is 25ft (7.5m). The refrigerant should be charged from the service port on the outdoor unit's
low pressure valve. The additional refrigerant to be charged can be calculated using the following formula:
Refrigerant
R454B
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Ø1/4in (Ø6.35mm)
(Pipe length – standard
length) x 0.16oz/ft
(Pipe length – standard
length) x 15g/m
31
Ø3/8in (Ø9.52mm)
(Pipe length – standard
length) x 0.32oz/ft
(Pipe length – standard
length) x 30g/m
Ø1/2in (Ø12.7mm)
(Pipe length – standard
length) x 0.69oz/ft
(Pipe length – standard
length) x 65g/m
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