Charging - Heat Controller DMH18DB-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 15m(50ft) 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/m(0.22oz/ft) of R-410A per meter(foot).
Max total length
Capacity (Btu/h) of all pipes
(A+B)
18k 30m(100ft)
Example:
A 75ft line set is used for dual - zone 25 additional ft X 0.22 ounces per foot= add 5.5 ounces of R-
410A
Important:(Unit is critically charge)
If you are ever uncertain of the unit charge, reclaim, evacuate and weigh in the correct charge using the unit name-
plate charge adjusting for line sets longer or shorter than 7.5m(25ft) for each indoor unit.
Max length of Min length of
each pipe (A/B) each pipe (A/B)
15m(50ft) 5m(16ft)
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)
Service Manual 33