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Service Manual
■ Each outdoor unit is factory charged (see rating plate) for the evaporator as well as a 7.5m(25ft) line set for each indoor line.
Any time the total line set is used either shorter or longer then the nominal line set length the refrigerant charge has to be
adjusted.
■ Whether the line set is made shorter or longer you must adjust the charge based on how many m(ft) of tubing are either
added or removed based on 20g(0.22oz) of R-410A per meter(foot).
Example: A 80ft line set is used for tri-zone, an additional 5 ft X 0.22 ounces per foot= add 1.1 ounces of R-410A
Important:
If you are ever uncertain of the unit charge, reclaim, evacuate and weigh in the correct charge using the charge amount speci-
fied on the unit's rating plate, adjusting for line sets longer or shorter than 7.5m(25ft) for each indoor unit. Unit is critically
charged.
18k 30m(100ft) 15m(50ft) 3m(10ft) 7.5m(25ft) 7.5m(25ft) 20g/m(0.22oz/ft)
24k 30m(100ft) 15m(50ft) 3m(10ft) 7.5m(25ft) 7.5m(25ft) 20g/m(0.22oz/ft)
Capacity (Btu/h)
Max total length
of all pipes
(A+B)
Max length of
each pipe (A/B)
Min length of
each pipe (A/B)
Max Elevation
between each indoor
unit and outdoor unit
(h1)
Max elevation
between indoor
units (h2)
Additional
Refrigerant
Charging
Charging
36k 45m(150ft) 15m(50ft) 3m(10ft) 7.5m(25ft) 7.5m(25ft) 20g/m(0.22oz/ft)
Capacity (Btu/h)
Max total length
of all pipes
(A+B+C)
Max length of
each pipe
(A/B/C)
Min length of
each pipe
(A/B/C)
Max Elevation
between each indoor
unit and outdoor unit
(h1)
Max elevation
between indoor
units (h2)
Additional
Refrigerant