Install Instructions

44 Multi Air Conditioner
Charging
Charging
■ 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 total line set is used either shorter or longer than the nominal 7.5*ID No. m(25*ID No. ft)
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 ft
of tubing are either added or removed based on 20g/m(0.22oz/ft) of R-410A per meter(foot).
Important:
If you are ever uncertain of the unit charge, reclaim, evacuate and weigh in the correct charge using
the charge amount specified on the unit's rating plate, adjusting for line sets longer or shorter than
7.5m(25ft) for each indoor unit.
Additional charge(g) = [(A Room Installation Length - Standard Length ) x 0.22 oz/ft
+ (B Room Installation Length - Standard Length ) x 0.22 oz/ft +.. ]
- CF(Correction Factor) x 1.61 oz
❈ CF = Max. number of connectable indoor unit – Total number of connected indoor unit
18k 50(164) 25(82) 3(10) 15(49) 7.5(25) 20(0.22) 22.5(74)
24k 75(246) 25(82) 3(10) 15(49) 7.5(25) 20(0.22) 37.5(128)
36k 75(246) 25(82) 3(10) 15(49) 7.5(25) 20(0.22) 37.5(128)
Outdoor Unit
Capacity
(Btu/h class)
Max total length
of all pipes
(A+B)/(A+B+C)/
(A+B+C+D)
Max length of
each pipe
(A/B/C/D)
Min length of
each pipe
(A/B/C/D)
Max Elevation
between each
indoor unit and
outdoor unit (h1)
Max elevation
between
indoor units
(h2)
Additional
Refrigerant
Unit : g/m (oz/ft)
Piping
Length(no add'l
refrigerant)
Unit:m(ft)
❈ If the total additional charge value after calculation comes out to be negative, then do not
consider additional charge.
Each branch pipe
a=82ft
b=16ft
c=49ft
Additional Charge
= (82-25) x 0.22
+ (16-25) x 0.22
+ (49-25) x 0.22
- (4-3) x 1.61
= 12.54 - 1.98 + 5.28 - 1.61 =14.23 oz
A
a
b
c
9k
9k
9k
Ex) A4UW363FA0