GB - 9
40KQV
E N G L I S H
IMPORTANT:
During the unit installation make first refrigerant connections
and then electrical connections. If unit is uninstalled first
disconnect electrical cables, then refrigerant connections.
Refer to the outdoor unit installation manual for tube sizing,
and limitations (slope, length, number of curves allowed,
refrigerant charge, etc.).
Tube diameter
Gas
Liquid
Mod.
(suction line)
(discharge line)
mm
(inches)
mm
(inches)
050 12.70 (1/2") 6.35 (1/4")
080-110-130 15.87 (5/8") 9.52 (3/8")
For refrigerant tubes use seamless, insulated refrigeration grade
tube, (Cu DHP type according to ISO1337), degreased and
deoxidized, suitable for operating pressures of at least 4200 kPa
and for burst pressure of at least 20700 kPa.
Under no circumstances must sanitary type copper pipe be used.
Flaring the end of pipes
Remove the protection caps from the copper pipe ends.
Holding the tube downward, cut the extreme end off, removing any
copper shavings with a deburring blade.
Remove the flare nuts from the “FLARE” connection body of the
indoor unit and insert them into the pipes.
Make the flare to the pipe end with the proper flaring tool.
Flare end must not have any burrs or imperfections.
The length of the flared walls must be uniform.
Lubricate the end of pipe and the thread of the flare connection
with anti-freeze oil.
Tighten by hand and then use two wrenches to tighten all
connections fully, applying the tightening torque shown in the table.
Pipe connection to the unit
Use two wrenches to tighten all connections.
Insufficient tightening torque could cause a refrigerant leak from
the connection.
Excessive tightening torque will damage the pipe flare.
Tube diameter
Torque
mm
(inches)
Nm
6.35
(1/4")
14
÷
18
9.52
(3/8")
33
÷
42
12.70
(1/2")
50
÷
62
15.87
(5/8")
63
÷
77
Once all connections have been completed, check for leaks using
soapy water.
Finally, wrap connections with anti-condensate insulation and
tighten with tape, without exerting excessive pressure on the
insulation. Repair and cover any possible cracks in the insulation.
Extra charge of refrigerant
Refer to installation manual of 38VYX series.
Checking
Pour several litres of water into the condensate drain pan and check
that it flows freely to the drain.
Check pipe gradient and look for possible obstructions.
Refrigerant connections
Pipe
Pipe insulation
Adhesive tape
