3.1.4 Precautions for the installation of the outdoor unit.
Order of installation of the units
B
A
C
B
C
A
The outdoor units must be installed in decreasing order of capacity:
Capacity of unit A
≥
capacity of unit B
≥
capacity of unit C.
Unit -A-, with the highest capacity, must be closest the indoor units.
Refrigerant pipe installation between outdoor units
B
A
C
K
L
A
L
B
L
C
B
A
C
K
≤100
≥ 500
≥ 500
The length between the connection kit -K- (on the side of the outdoor unit) and the outside unit, must be
L
A
≤
L
B
≤
L
C
≤
10 m.
Place the connection kit at a lower level with respect to the connection of the refrigerant pipes of the outdoor unit.
A ≥ 200
≤ 300
A ≥ 200
A ≥ 200
≤ 300
≤ 300
If the connection kit is placed above the refrigerant pipe connection of the outdoor unit, keep a maximum of 300 mm
between the connection kit and the base of the outdoor unit. In addition, an oil recovery unit -A- (minimum 200 mm) should
be fitted between the connection kit and the outdoor unit.
<2000
≥ 2000
<2000
<2000
A ≥ 200
<2000
≥ 2000
A ≥ 200
If the length of the refrigerant gas and liquid pipes between outdoor units is greater than two metres, the oil recovery unit
should be fitted on the gas pipe to prevent the build-up of refrigerant oil.
3 Piping work and
refrigerant charge
38
SMGB0065 rev. 1 - 12/2010
