25
Indoor/outdoor units connection finishing and test run
==
Refrigerant adjustment... If pipe length exceeds 10 m, additional refrigerant (R22) charge is required.
(The outdoor unit is charged with refrigerant for pipe length up to 10 m.)
CAUTION:
Be sure to use the insulation of specified thickness, Excessive thickness may cause incorrect installation of
the indoor unit and lack of thickenss may cause dew drippage.
Pipe length and height difference
UNIT NO.
pipe length per
indoor unit
Height difference
No.of bends
A
20 m max.
10 max.
B
20 m max.
10 max.
Total 30 m max.
10 m max.
Total 15 max.
Limits
C
20 m max.
Total 30 m max.
10 m max.
10 max.
Total 15 max.
Pipe length (one-way)
10 m or less
10
J
30m
Refregerant to be added
No additional charge
10 g/m
C unit
Refregerant to be added
No additional charge
10 g/m
A unit + B unit
==
Indoor unit A and B or C and D are in the same refrigerant cycle system, so please add enough refrigerant to run both
units A and B or C and D.
Piping preparation
Table below shows the specifications of pipes commercially available.
Ensure that the 2 refrigerant pipes are insulated to prevent condensation.
Refrigerant pipe bending radius must be 100 mm or more.
Selecting pipe size
The diameter of connection pipes differs according to the type and the capacity of indoor units, Match the diameters
of connection pipes for indoor and outdoor units according to the following table.
Valve size for outdoor unit.
Pipe
For liquid
For gas
Insulation thickness
Heat resisting foam plastic
0.045 specitic gravity
Outside diameter
6 mm
9.52 mm
Insulation thickness
8 mm
8 mm
Liquid pipe
Gas pipe
Liquid pipe
Gas pipe
Liquid pipe
Gas pipe
Liquid pipe
Gas pipe
Valve size for outdoor unit
6.00 mm
9.52 mm
6.00 mm
9.52 mm
6.00 mm
9.52 mm
6.00 mm
9.52 mm
A UNIT
B UNIT
C UNIT
D UNIT
D
20 m max.
10 max.
