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6-8. Additional Refrigerant Amount
n Twin system
<Formula for Calculating Additional Refrigerant Amount>
Do not remove the refrigerant even if the additional refrigerant amount becomes minus result as a result of
calculations by the following formula and operate the air conditioner as it is.
Additional refrigerant amount (kg) = Main piping additional refrigerant amount (kg)
+ Branch piping additional refrigerant amount (kg)
=
αα
αα
α × (L – 18) +
γγ
γγ
γ × (a + b – 4)
αα
αα
α : Additional refrigerant amount per meter of actual main piping length (kg)
γγ
γγ
γ : Additional refrigerant amount per meter of actual branch piping length (kg)
L : Actual length of main piping (m)
a, b : Actual length of branch piping (m)
CAUTION
1. Be certain to wire the additional refrigerant amount, pipe length (actual length), head and other
specification on the nameplate put on the outdoor unit for recording.
2. Seal the correct amount of additional refrigerant in the system.
Indoor unit B
Indoor unit A
Distributor
b
Branch pipe
a
Branch pipe
H
L
Main pipe
∆h
Outdoor unit
Standard piping length
Main piping Branch piping
18 m 2 m
Connecting pipe diameter
Lab
Ø9.5 Ø6.4 Ø6.4
Additional refrigerant amount per Meter (kg/m)
αα
αα
α
ββ
ββ
β
γγ
γγ
γ
0.040 — 0.020