LG MULTI AMNQ09GSJAA - Page 69

4. Refrigerant piping system
14
MULTI/SINGLE CAC
Installation of Outdoor Units
■ Multi -Distributor Box type
CAUTION
• Please check the product type. Piping installation and refrigerant charge varies depending on the type of
product. For more information, please refer to the installation manual.
 Refrigerant additional charge calculation method
Additional charge (g) = [(L1 + L2 + L3) - A] x a + [(L4 + L5 + … + L10) – (B x CF1)] x b – (CF2 x 100)
L1~L3 (m) : Installed Main Piping Length (Outdoor Unit ~ BD Unit)
L4~L10 (m) : Installed Branch Piping Length (BD Unit ~ Indoor Unit)
A (m) : Charge-less Main piping length (Outdoor Unit ~ Indoor Unit)
B (m) : Charge-less Branch piping length (BD Unit ~ Indoor Unit)
a (g/m) : Additional charging volume for Main Pipe (Outdoor Unit ~ BD Unit)
b (g/m) : Additional charging volume for Branch Pipe (BD Unit ~ Indoor Unit)
CF1 : Total number of connected indoor unit ÷ Max. number of connectable indoor unit
CF2 : Max. number of connectable indoor unit – Total number of connected indoor unit
* Refer to the specifications for detail information of A, B, a, b.
* If total additional charge value after calculation comes out to be negative, then do not consider additional charge.
CAUTION
• Capacity is based on standard length and maximum allowance length is on the basis of reliability.
• Improper refrigerant charge may result in abnormal cycle.
Indoor Unit
Indoor Unit
BD
Unit
BD
Unit
Branch
Indoor Unit
Indoor Unit
Indoor Unit
Indoor Unit
Indoor Unit
L1
L2
L3
L4
L5
L6
L7
L8
L9
L10
H3
H2
H1
Piping
type
Outdoor Unit ~ BD Unit BD Unit ~ Indoor Unit
L1, L2, L3 L4~L10
Liquid pipe
Adjust to outdoor
unit’s piping size
Adjust to indoor unit’s
piping size
Gas Pipe
Notes
L1~L3 (m) : Main Piping Length
(Outdoor Unit ~ BD Unit)
L4~L10 (m) : Branch Piping Length
(BD Unit ~ Indoor Unit)
H1 (m) : Height Difference (Outdoor Unit ~ Indoor Unit)
H2 (m) : Height Difference (Indoor Unit ~ Indoor Unit)
H3 (m) : Height Difference (BD Unit ~ Indoor Unit)
Refer to the specifications of Outdoor Unit for Maximum limit .
Piping Connection Size for BD Unit
* In case of connecting one BD unit, branch is not required.
*