8.1.5 Precautions for the installation of the
outdoor unit
Order of installation of the units
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
• For FSXN1E and FSXNH(E)
• For FSXN1E only
≤10
≥500
The length between the connection kit -K- (on the side of the out-
door unit) and the outside unit, must be L
A
≤ L
B
≤ L
C
≤ L
D
≤ 10 m.
Place the connection kit at a lower level with respect to the con-
nection of the refrigerant pipes of the outdoor unit.
If the connection kit is placed above the refrigerant pipe connec-
tion 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 tted between the
connection kit and the outdoor unit.
If the length of the refrigerant gas and liquid pipes between out-
door units is greater than two metres, the oil recovery unit should
be tted on the gas pipe to prevent the build-up of refrigerant oil.
Place the refrigerant pipes of the outdoor units horizontally, or
slightly tilted towards the side of the indoor units to prevent the
build-up of refrigerant oil at the lowest point -A-.
If the refrigerant pipes are opposite the outdoor unit, there should
be a minimum of 500 mm between the outdoor units and the con-
nection kits -B- for maintenance operations.
NOTE
The 500 mm space is required when replacing the unit compressor.
± 15º
Install the connection kits parallel to the oor (± 15°).
30
PMML0294A rev.2 - 07/2014
Piping work and refrigerant charge
PMML0294A_rev.2_02-2014.indb 30 14/07/2014 12:28:19
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