Toshiba RAV-SM2804AT7 Installation Manual page 17

Digital Inverter
Adding additional refrigerant
Figure of Simultaneous twin
Outdoor Unit
Formula for calculating the amount of additional refrigerant
(Formula will differ depending on the diameter of the liquid connecting side pipe.)
* 1 to 7 are the lengths of the pipes shown in the figures above (unit: m).
Simultaneous twin
Diameter of connecting pipe
(liquid side)
1
Ø12.7 Ø9.5
Simultaneous triple
Diameter of connecting pipe (liquid side)
1
Ø12.7 Ø9.5
Simultaneous double twin
Diameter of connecting pipe
Outdoor
unit
1
SM2244 Ø12.7
SM2804 Ø12.7
Indoor Unit
Indoor Unit
2 3
1
Indoor Unit
Outdoor Unit
4
Amount of additional
refrigerant per meter
α
2 3
Ø9.5 80
2 3 4
Ø9.5 Ø9.5
(liquid side)
2, 3 4 to 7
Ø9.5 Ø6.4
Ø9.5 Ø9.5
Outdoor Unit
Figure of Simultaneous double twin
Indoor Unit
5
2
1
(g/m)
amount of refrigerant added for branch piping
β
40
Amount of additional
refrigerant per meter
(g/m)
α β
80 40
Amount of additional
refrigerant per meter (g/m)
α β
80 40
80 40
16
Figure of Simultaneous triple
Indoor Unit
Indoor Unit
4
2
1
Indoor Unit
Indoor Unit
6 7
3
Amount of additional refrigerant (g) =
Amount of refrigerant added for main pipe +
α × ( 1 – 28) + β × ( 2 + 3 – 4)
Amount of additional refrigerant (g) =
Amount of refrigerant added for main pipe +
amount of refrigerant added for branch
α × ( 1 – 28) + β × ( 2 + 3 + 4 – 6)
Amount of additional refrigerant (g) =
Amount of refrigerant added for main pipe
+ amount of refrigerant added for first
branch piping + amount of refrigerant
γ
added for second branch piping
α × ( 1 – 28) + β × ( 2 + 3 – 4) +
20
γ × ( 4 + 5 + 6 + 7)
α × ( 1 – 28) + β × ( 2 + 3 – 4) +
40
γ × ( 4 + 5 + 6 + 7)
Indoor Unit
3
piping
EN