Haier MRV 5-RC VP1-112B Service Manual page 127

Graphical representation for wiring
Connect the communication terminal block P and Q of the main unit of the outdoor units with the communication
terminal block P and Q of the first valve box (VP 1).
Outdoor 1
P Q A B C
To power supply
1PH,220-230V~,
50/60Hz
B
Rated
Current
of
Overflow
L N P Q B C
Breaker
Outdoor Indoor
VP 1
Indoor 1
P Q A C
wired
A B C
controller
Notes:
(1) The above wiring example is only for reference. The number of valve boxs and indoor units shall be subject to
the field installation.
(2) Communication line from cooling-only indoor unit may be connected to the communication terminal block P and
Q (outdoor) of the valve box.
(3) Two-core nonpolar communication line with shield shall be adopted for communication lines between the valve
box and the indoor/outdoor unit. Three-core polar communication line with distinguished polarities and shield
shall be adopted for the wire controller connected to the indoor unit.
(4) All valve boxes within one system may share one overcurrent breaker for power supply. But it's necessary to
compute total current capacity specification.
(5) For wring harness connected to the power terminal block, the terminal shall be pressed with a round (refer to
the following figure).
1) The power terminal block shall 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
Outdoor 2
A C B
communication wire with polarity
L N
Outdoor
VP 2
Indoor 2
B P Q A C B
wired
A B C
controller
Cooling and Heating indoor units simultaneous
Round. Press the terminal
It's forbidden to connect
two wires on one side
Outdoor 3
A C B
The communication wire of valve
boxes and outdoor units as well as
between valve boxes with non-polar.
L N P Q
P Q B C
Outdoor
Indoor
VP 3
Indoor 3
P Q A C B
wired
A B C
controller
Insulating sleeve
Wires with different
diameters are not allowed
124
Indoor 5
B C
Indoor
Indoor 4
Indoor 6
P Q A C B
wired
wired
A B C
controller
controller
Cooling-only indoor unit
Wire
P Q A C B
A B C
P Q A C B
A B C