Haier MRV 5-RC VP1-112B Service Manual page 126

• Electrical construction should be made with specific mains circuit by the qualified personnel according to the
installation instruction. Electric shock and fire may be caused if the capacity of power supply is not sufficient.
• During arranging the wiring layout, specified cables should be used as the mains line, which accords with the
local regulations on wiring. Connecting and fastening should be performed reliably to avoid the external force of
cables from transmitting to the terminals. Improper connection or fastness may lead to burning or fire accidents.
• There must be the ground connection according to the criterion. Unreliable grounding may cause electrical
shocks. Do not connect the grounding line to the gas pipe, water pipe, lightening rod and telephone line.
• Only copper wire can be used. Breaker for electric leakage should be provided, or electric shock may occur.
• The wiring of the mains line is of Y type. The power plug L should be connected to the live wire and plug N
connected to null wire while
heating function, the live wire and the null wire should not be misconnected, or the surface of electrical heating
body will be electrified. If the power line is damaged, replace it by the professional personnel of the manufacturer
or service center.
• The power line of valve boxes should be arranged according to the installation instruction of valve boxes.
• The electrical wiring should be out of contact with the high-temperature sections of tubing as to avoid melting the
insulating layer of cables, which may cause accidents.
• After connected to the terminal tier, the tubing should be curved into be a U-type elbow and fastened with the
pressing clip.
• Controller wiring and refrigerant tubing can be arranged and fixed together.
• The machine can't be powered on before electrical operation. Maintenance should be done while the power is
shut down.
• Seal the thread hole with heat insulating materials to avoid condensation.
• Signal line and power line are separately independent, which can't share one line. [Note: the power line, signal
line are provided by users. Parameters for power lines are shown as below: 3×(1.0-1.5) mm
signal line: 2×(0.75-1.25)mm
• Valve boxes and outdoor units should be connected to the power source separately. All valve boxes must share
one single electrical source, but its capacity and specifications should be calculated. Indoor & outdoor units
should be equipped with the power leakage breaker and the overflow breaker.
• Valve box can be installed in multiple, named as unit A, unit B.... Pay attention to the marks on the terminal block
when connecting the outdoor unit with the indoor unit. Refer to wiring example as described in 5-2 while ensuring
correct connection. In addition, the operation will be abnormal when the wiring and the tubing between indoor and
outdoor machine sets are installed in different refrigerant systems.
• Energization is not to be done before it's confirmed that the valve box have completely installed and that the
outdoor and indoor installation is completed.
The wiring for the power line and signal line of valve box
The wiring for the power line of valve box, the wiring for the signal line between valve boxes and outdoor units as
well as the wiring between valve boxes.
Items
Cross
Section
Total Current
(mm
of valve boxes (A)
<10
≥10 and <15 3.5
≥15 and <22 5.5
≥22 and <27 10
• Power cable and communication wire must be fixed firmly.
• Each valve box must be earthed well.
• When power cable exceeds the range, thicken it appropriately.
• Shielded layer of communication wires must be connected together and be earthed at single point.
• Communication wire total length cannot exceed 1000m.
should be connected to the ground wire. For the type with auxiliary electrically
2
( shielded line)]
Rated
Length Current of
(m) Overflow
2
)
Breaker (A)
2 20 20
25 30
30 40
40 50
Warning
Attention
Rated Current of Power
Leakage Breaker (A)
Leaking Current (mA)
Operating Period (S)
20A,30mA,0.1S or below
30A,30mA, 0.1S or below
40A,30mA, 0.1S or below
50A,30mA, 0.1S or below
123
2
; parameters for
Cross Sectional Area of Signal Line
Outdoor-valve Valve box- valve
2
box (mm ) box (mm
2
2cores ×0.75-2.0 mm shielded line
2
)