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9 - REFRIGERANT CONNECTION
This chapter is intended for units supplied in the Split version.
Maximum distances between modules
● The maximum equivalent length of the refrigerant line is 50
meters, with a maximum geometric height of 40 meters when
the outdoor module is above. For longer distances, up to 100
meters maximum, it is necessary to use an oil separator per
refrigerant circuit (long distance option).
● The maximum equivalent length of the refrigerant line is 30
meters, with a maximum geometric height of 6 meters when
the indoor module is above.
Outdoor module top
Maximum equivalent length of the refrigerant line: 50 metres
2%
Outdoor
module
L: liquid line
G: gas line
Important: Siphon in gas line
for every 3 meters of drop
Indoor
module
Outdoor module bottom
Maximum equivalent length of the refrigerant line: 30 metros
L: liquid line
G: gas line
Important: Siphon in gas line
for every 3 meters of drop
Indoor
module
22
L
G
2%
G
L
Outdoor
module
Recommendations
The following considerations should be taken into account:
● For the refrigerant lines, use only cooling-type seamless tubes.
Under no circumstance use sanitary type copper pipe.
● To calculate equivalent length, it is necessary consider
pressure drops by accessories.
● Tube installation norms must be
respected and carefully inspect the
tube layout, looking for the shortest
distance and the lowest possible
number of curves. Also, chokes
must be avoided, using large curve
radius (the curve radius must be ≥
∅
3,5 x
).
Pressure drops in the elbows expressed as equivalent lengths:
Tube diameter (inches)
Equivalent elbow length 45º (m) 0,24
Equivalent elbow length 90º (m) 0,45
Equivalent elbow length 180º (m) 0,75
● Limit pressure drops in the circuit to 1 K equivalent. Maximum
speed on the gas line of 14 m/s.
● The pipes must be properly secured with holding brackets to
prevent buckling.
● Horizontal pipes should have a slight slope (2%) to facilitate
the return of oil to the compressor.
● Place one siphon on the gas line for every 3 meters of vertical
drop to facilitate the return of oil to the compressor.
Connection
The installer must carry out the refrigerant connection between
the modules and the refrigerant charge of the circuit. Both
modules are shipped with a safety nitrogen charge that must be
removed before any operation. Optionally, the outdoor module
can be supplied with service valves and R-410A refrigerant
precharge (up to 7.5 meters).
The steps to follow for the connection of the modules are:
● Cut the pipes ends in both modules, because they are sent
closed. Make this operation just at the time of the pipe's
connections. Revise and clean the tube ends to eliminate
the burs from cutting them and any other impurity that could
have deposited inside or on the outer surface. The tightness
of the connection will depend on the cleaning of the pipes.
Also, the formation of dirt that collapses some points of the
refrigeration circuit will be avoided.
● Carry out the layout of the interconnection pipes between
the modules following the recommendations in the previous
section.
In units with two circuits, it must be checked that the
interconnection of circuits 1 and 2 of both modules is correct.
See the stickers attached to the modules:
1
Circuit 1 (C1)
CIRCUIT
Æ
1/2"
5/8"
7/8" 1 1/8" 1 3/8"
0,30
0,39
0,48
0,60
0,54
0,72
0,90
1,10
0,80
1,00
1,30
1,80
2
Circuit 2 (C2)
CIRCUIT
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