Charging - Heat Controller B-MMC09FA-1 Service Manual

Charging

I Each outdoor unit is factory charged (nameplate charge) 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 then the nominal 22.5m(75ft: for tri-zone) line set length the refrigerant
charge has to be adjusted.
I 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(0.22oz) of R-410A per meter(foot).
Max total length
Capacity (Btu/h) of all pipes
(A+B)
18k 30m(100ft)
24k 30m(100ft)
Max total length
Capacity (Btu/h) of all pipes
(A+B+C)
36k 45m(150ft)
Example:
A 80ft line set is used for tril - zone 5 additional 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 unit nameplate charge
adjusting for line sets longer or shorter than 7.5m(25ft) for each indoor unit. Unit is critically charged.
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Max length of Min length of
each pipe (A/B) each pipe (A/B)
15m(50ft) 5m(16ft)
15m(50ft) 3m(10ft)
Max length of Min length of
each pipe each pipe
(A/B/C) (A/B/C)
15m(50ft) 3m(10ft)
- 39 -
Max Elevation
Max elevation
between each indoor
between indoor
unit and outdoor unit
units (h2)
(h1)
7.5m(25ft) 7.5m(25ft)
7.5m(25ft) 7.5m(25ft)
Max Elevation
Max elevation
between each indoor
between indoor
unit and outdoor unit
units (h2)
(h1)
7.5m(25ft) 7.5m(25ft)
Charging
Additional
Refrigerant
20g/m(0.22oz/ft)
20g/m(0.22oz/ft)
Additional
Refrigerant
20g/m(0.22oz/ft)
LGE Internal Use Only