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Piping work and refrigerant charge
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
The length between the connection kit -K- (on the side of the out-
door unit) and the outside unit, must be L
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 fitted between the
connection kit and the outdoor unit.
30
PMML0294A_rev.2_02-2014.indb 30
≥500
≤ L
≤ L
≤ L
≤ 10 m.
A
B
C
D
PMML0294A rev.2 - 07/2014
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 fitted 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.
N O T E
The 500 mm space is required when replacing the unit compressor.
≤100
± 15º
Install the connection kits parallel to the floor (± 15°).
A
A
B
14/07/2014 12:28:19
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