Carrier XCT 7 40VA003D7FAQEE Manual Del Usuario página 21

Electrical wiring
Notes:
(1) The above wiring example is only for reference. The number of connection kits and indoor units will be subject to
the field installation.
(2) Two-core non-polar communication lines with a shield will be adopted for communication lines between the
connection kit and the indoor/outdoor unit.
(3) All connection kits within one system may share one overcurrent breaker for power supply.
However, calculating the total current capacity specification is necessary.
(4) For wiring harness connected to the power terminal block, the terminal should be pressed with a round (refer to
the following figure).
Round. Press the terminal
1) The power terminal block should not be crimped with 2 wires of different diameters. Otherwise, poor crimp
connection and looseness may lead to abnormal heating or sparking of the line.
2) Refer to the following figure for crimping wires with the same diameter.
Connect wires with the same
diameter on both sides
(5) Tighten the terminal screws with a proper screwdriver. A small screwdriver will damage the screw head and fail to
tighten properly.
(6) If the terminal screws are attached very tight, they may be damaged. Refer to the following
table for tightening torques of terminal screws:
Dimension of terminal screw
M3.5 (terminal block for communication line)
M4 (terminal block for power line)
M4 (terminal block for ground wire)
(7) Do not connect the power line to the communication terminal block because it will damage the circuit control
board.
(8) Wiring of communication lines should be within the following scope. Exceeding the limit may lead to abnormal
communication.
1) The maximum wiring length between the outdoor machine and the valve cage, the valve cage and the indoor
machine, and between valve cages should not exceed 1000 m. The total wiring length is a maximum of 1000
m.
2) The maximum wiring length between the valve cage and the wire controller for switching working modes is
500 m.
Insulating sleeve
Two wires should not be
connected
on one side
Tightening torque (N.m)
0.80~0.96
1.18~1.44
1.52~1.86
20
Wire
Wires with different diameters
are not allowed