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10 Installation Instruction
10.1. Pipe length
• CORRECTION OF CAPACITIES
1. Correction of capacities according to the connecting pipe length.
The data of rated capacities (marked on the name plate) are based on 7.5 meters connecting pipe and horizontal installation.
2. For other pipe length of other installation multiply by the following correction factor to determine the revised cooling capacity.
Note :
Piping elevation B = outdoor unit installed at top
Piping elevation C = outdoor unit installed at bottom
10.2. Refrigerant additional charge
1. Piping installation by standard piping
• At the time of shipment from the factory, this unit is charged with enough refrigerant for an equivalent pipe length of 20m.
(Refer the following table)
But when the piping length exceeds 20m, additional charge is required according to the following table.
Example:
CU-J18DBE5
In case of 30m long pipe (one way), the amount of refrigerant to be replenished is: (30 - 20) x 20 = 200g
Piping Size / Length & Elevation
Model No. Piping size Piping
length
(A)
Piping
elevation
(B)
Piping
elevation
(C)
Piping
Chargeless
Add
Refrigerant
Liquid /
High
Valve Gas /
Low
Valve Max(m) Max(m) Max(m) Max(m) (g/m)
R
Cassette 4
type 1 CS-F18DTE5 6.35 3-ways 12.70 3-ways 30 20 20 20 20
0
A
Model Name Standard piping specification
Liquid piping
(dia.mm)
Gas piping
(dia.mm)
Gas chargeless
length (m)
Additional gas
volume (g/m)
CU-J18DBE5 6.35 12.7 20 20
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