Electrical Connections - Carrier 40KMC N Series Installation Manual

Refrigerant connections
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.).
Gas
Mod. (suction line)
mm (inches)
12 - 18 - 24 12,70 (1/2")
28 15,87 (5/8")
36 - 48 - 60 19,05 (3/4")
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
See fig. 29.
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.
See fig. 30.
Flare end must not have any burrs or imperfections.
The length of the flared walls must be uniform.
See fig. 31.
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.

Electrical connections

See fig. 35.
Control panel can be reached by opening the grille and removing its
metal cover by 4 screws.
See fig. 36 - 37.
IMPORTANT for units equipped with electric heater:
The unit is equipped with two thermostats: one with automatic reset
and one with manual (electric) reset that can be reactivated by
switching the power supply off and then on.
SYSTEM CONFIGURATION
IMPORTANT:
• Make ground connection prior to any other electrical
connections.
30 40KMC---N
Tube diameter
Liquid
(discharge line)
mm (inches)
6,35 (1/4")
6,35 (1/4")
9,52 (3/8")
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.
See fig. 32.
Tube diameter
mm (inches)
6,35 (1/4")
9,52 (3/8")
12,70 (1/2")
15,87 (5/8")
19,05 (3/4")
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.
See fig. 33.
Extra charge of refrigerant (for R-410A only)
With pipe lengths up to 8 metres, the models shown below need an
extra charge of refrigerant (R-410A).
For longer pipes, refer to the outdoor unit installation manual.
40KMC024N
Indoor unit model
40KMC124EN
Outdoor unit model 38GL024G
Pipe lengths
up to 8 m
Checking
See fig. 34.
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.
• If the is fitted with an electric heater, this must have a separate
power supply.
• Make the electrical connections between units prior to proceeding
to the main supply unit connection.
• According to the installation instructions, the disconnecting
switches from the mains power supply should have a contact gap
(4 mm) such that total disconnection can be ensured under the
conditions provided for by overvoltage class III.
• Make sure the electric heaters power supply cable is fixed as
shown in the figure CABLE PASSAGE (vedi fig. 47).
Make certain that the YELLOW/GREEN cable is stripped back
further than the others.
See fig. 38 - 47.
WARNING:
The ground wire for the indoor unit-outdoor unit connection cable
must be clamped to a soft copper tin-plated eyelet terminal with M4
screw hole.
Torque
Nm
18
42
55
65
100
40KMC018N
40KMC118EN
38YY018G
70 g 110 g