Mitsubishi Heavy Industries SRK20ZIX-S Service Manual page 32

4. ELECTRICAL WIRING WORK
Electrical installation work must be performed by an electrical installation service provider qualified by a power provider of the country.
Electrical installation work must be executed according to the technical standards and other regulations applicable to electrical installations in the country.
Do not use any supply cord lighter than one specified in parentheses for each type below.
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- braided cord (code designation 60245 IEC 51),
- ordinary tough rubber sheathed cord (code designation 60245 IEC 53)
- flat twin tinsel cord (code designation 60227 IEC 41);
Use polychloroprene sheathed flexible cord (code designation 60245 IEC57) for supply cords of parts of appliances for outdoor use.
Ground the unit. Do not connect the grounding wire to a gas pipe, water pipe, lightning rod or telephone grounding wire.
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If impropery grounded, an electric shock or malfunction may result.
A grounding wire must be connected before connecting the power cable. Provide a grounding wire longer than the power cable.
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The installation of an impulse withstanding type earth leakage breaker is necessary. A failure to install an earth leakage breaker can result in an
• œ
acccident such as an electric shock or a fire.
Do not turn on the power until the electrical work is completeted.
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Do not use a condensive capacitor for power factor improvement under any circumstances. (It dose not improve power factor, while it can cause
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an abnormal overheat accident)
For power supply cables, use conduits.
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Do not lay electronic control cables (remote control and signaling wires) and other cables together outside the unit. Laying them together can result
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in the malfunctioning or a failure of the unit due to electric noises.
Fasten cables so that may not touch the piping, etc.
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When cables are connected, make sure that all electrical components within the electrical component box are free of loose connector coupling or
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terminal connection and then attach the cover securely.( Improper cover attachment can result in malfunctioning or a failure o fthe unit, if water
penetrates into the box.)
Always use a three-core cable for an indoor-outdoor connecting cable. Never use a shield cable.
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Power supply terminal block
Cable clamp
It holds cables in place and protect the terminal
•›
connection from external force.
This clamp is for the cable in the outside
•›
diameter 9~15mm.
Please adjust it when not suitable.
Cable name plate
•› It has stuck on the lid of a control box.
Grounding terminal
Please be sure to carry out D-type (type III)
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grounding work.
For details of electrical cabling, refer to the indoor unit installation manual.
Power cable, indoor-outdoor connecting wires
Earth leakage breaker
(Harmonic resistant type)
Switchgear or Circuit breaker
N L
Outdoor unit
2/N 3
1
1 2/N 3
Indoor unit
X Y
In case of faulty wiring connection, the indoor units tops,
and then the run lamp turns on and the timer lamp blinks.
Use cables for interconnection wiring to avoid loosening of the wires.
CENELEC code for cables Required field cables.
H05 RNR3G1.5 ( Example ) or 245IEC57
H Harmonized cable type
05 300/500 volts
R Natural-and/or synth. rubber wire insulation
N Polychloroprene rubber conductors insulation
R Stranded core
4or5 Number of conductors
G One conductor of the cable is the earth conductor
(yellow/green)
1.5 Section of copper wire (mm
Always perform grounding system installation work with the power cord unplugged.
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Always use an earth leakage circuit breaker designed for inverter circuits to
CAUTION
prevent a faulty operation.
Switchgear or Circuit Breaker
Earth leakage breaker
Phase Model
Switch breaker Over current protector
40
15A,30mA,
Single-phase 50
30A
0.1sec or less
60
The specifications shown in the above table are for units without heaters. For units with heaters, refer to
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the installation instructions or the construction instructions of the indoor unit.
Switchgear or Circuit breaker capacity which is calculated from MAX. over current should be chosen along the
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regulations in each country.
The cable specifications are based on the assumption that a metal or plastic conduit is used with no more than
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three cables contained in a conduit and a voltage drop is 2%. For an installation falling outside of these
conditions, please follow the internal cabling regulations. Adapt it to the regulation in effect in each country.
CAUTION
)
2
Interconnecting and
Power souce
grounding wires
(minimum)
(minimum)
rated capacity
2.0
16A 2 1.5 2 ×4
mm mm