Electric Wiring Work Instruction - Mitsubishi Heavy Industries FDU45KXE6F-W Technical Manual

8.2 Electric wiring work instruction

Electrical wiring work must be performed by an electrician qualified by a local power provider according to
the electrical installation technical standards and interior wiring regulations applicable to the installation site.
Security instructions
Read the "SAFETY PRECAUTIONS" carefully first of all and then strictly follow it during the
●
installation work in order to protect yourself.
The precautionary items mentioned below are distinguished into two levels,
●
and .
CAUTION
: Wrong installation would cause serious consequences such as injuries or death.
: Wrong installation might cause serious consequences depending on circumstances.
CAUTION
Both mentions the important items to protect your health and safety so strictly follow
them by any means.
The meanings of "Marks" used here are as shown on the right:
●
Never do it under any circumstances.
Accord with following items. Otherwise, there will be the risks of electric shock and
●
fire caused by overheating or short circuit.
●Be sure to have the electrical wiring work done by qualified electrical installer,
and use exclusive circuit.
Power source with insufficient capacity and improper work can cause electric shock and fire.
●Use specified wire for electrical wiring, fasten the wiring to the terminal securely,
and hold the cable securely in order not to apply unexpected stress on the terminal.
Loose connections or hold could result in abnormal heat generation or fire.
●Arrange the electrical wires in the control box properly to prevent them from
rising. Fit the lid of the services panel property.
Improper fitting may cause abnormal heat and fire.
●Use the genuine option parts. And installation should be performed by a specialist.
If you install the unit by yourself, it could cause water leakage, electric shock and fire.
●Do not repair by yourself. And consult with the dealer about repair.
Improper repair may cause water leakage, electric shock or fire.
●Consult the dealer or a specialist about removal of the air-conditioner.
Improper installation may cause water leakage, electric shock or fire.
●Turn off the power source during servicing or inspection work.
If the power is supplied during servicing or inspection work, it could cause electric shock and injury by
the operating fan.
●Shut off the power before electrical wiring work.
It could cause electric shock, unit failure and improper running.
●Perform earth wiring surely.
Do not connect the earth wiring to the gas pipe, water pipe, lightning rod and telephone earth wiring.
Improper earth could cause unit failure and electric shock due to a short circuit.
●Earth leakage breaker must be installed.
If the earth leakage breaker is not installed, it can cause electric shocks.
●Make sure to install earth leakage breaker on power source line.
(countermeasure thing to high harmonics.)
Absence of breaker could cause electric shock.
●Use the circuit breaker of correct capacity. Circuit breaker should be the one
that disconnect all poles under over current.
Using the incorrect one could cause the system failure and fire.
●Do not use any materials other than a fuse of correct capacity where a fuse
should be used.
Connecting the circuit by wire or copper wire could cause unit failure and fire.
●Use power source line of correct capacity.
Using incorrect capacity one could cause electric leak, abnormal heat generation and fire.
●Do not mingle solid cord and stranded cord on power source and signal side
terminal block.
In addition, do not mingle difference capacity solid or stranded cord.
Inappropriate cord setting could cause loosing screw on terminal block, bad electrical contact, smoke and fire.
●Do not turn off the power source immediately after stopping the operation.
Be sure to wait for more than 5 minutes. Otherwise it could cause water leakage or breakdown.
●Do not control the operation with the circuit breaker.
It could cause fire or water leakage. In addition, the fan may start operation unexpectedly and it may
cause injury.
Control mode switching
●The control content of indoor units can be switched in following way.
( is the default setting)
Switch No. control content
SW1 Indoor unit address (tens place)
SW2 Indoor unit address (ones place)
SW3 Outdoor unit address (tens place)
SW4 Outdoor unit address (ones place)
SW5－1 ON Fixed previous version of Superlink protocol
OFF Automatic adjustment of Superlink protocol
SW5－2 Indoor unit address (hundreds place)
SW6－1 ~ 4 Model capacity setting
SW7－1 ON Operation check, Drain motor test run
OFF Normal operation
Always do it according to the instruction.
WARNING
CAUTION
① Electrical Wiring Connection
●Electrical wiring work must be performed by an electrician an qualified by a local power
provider. These wiring specifications are determined on the assumption that the following
instructions are observed:
① Do not use cords other than copper ones.
Do not use any supply line lighter than one specified in parentheses for each type below.
-braided cord (code designation 60245 IEC 51), if allowed in the relevant part 2;
-ordinary tough rubber sheathed cord (code designation 60245 IEC 53);
-flat twin tinsel cord (code designation 60227 IEC 41);
-ordinary polyvinyl chloride sheathed cord (code designation 60227 IEC 53);
② Provide a separate power outlet for each outdoor or indoor unit.
③ All indoor units grouped in one system must have power source that can be turned on or off simultaneously.
④ Pay extra attention so as not to confuse signal line and power source line connection, because an error in their connection
can be burn all the boards at once.
● Connect ground wires before connecting wires between the indoor and outdoor units and
between indoor units. The ground wires need to be longer than the wires between the
indoor and outdoor units, and protected from undue stress.
● Do not turn on the power source before completing the work.
●
The ground wires must be connected by the Class D grounding connection.
●
Use the round crimp terminals for connections to the terminal block.
●
Use dedicated branch circuits, avoiding combination with other devices. Otherwise, it
could trip the power source breaker, resulting in secondary accidents.
● Install the overcurrent and earth leakage breakers specified to respective models.
● Do not connect indoor and outdoor signal cables to extension cables on the way. If the
joint is wetted with intruding water, it could cause a ground insulation failure or poor
connection, resulting in communication errors. (If it is inevitable to connect cables on the
way, make sure to prevent the water intrusion completely.)
● When running wires (wires for power supply, remote control, connecting between
indoor and outdoor units, or other) behind the ceiling, protect them using copper or other
pipes against assault by rat, or other.
● It is up to 3.5 mm the size of power source cables connected to indoor units. When using cables
2
of 5.5 mm or larger, provide a dedicated pull box for branching connection to indoor units.
2
● If signal and power source cables are connected mistakenly, it could burn down all PCBs.
① Even if the power source of 220/240/380/415 V is connected mistakenly to A-B signal cable, it is protected at initial occasion
only.
② If the remote control fails to detect the unit No. (address) at 15 minutes after turning the power on, check and repair all
signal cables for misconnection.
③ Cut the jumper wire J10SL1 of burnt PCB, and reconnect connectors CnK (yellow) and CnK1 (white) to CnK2 (black).
④ If any anomaly is found on wires between the A-B terminal block and the PCB, replace them.
● At the outside of indoor and outdoor units, take care to avoid direct contacts between
remote control and power source cables.
● In no event connect the power source of 220/240/380/415 V to the remote control
terminal block. It could cause failures.
● Connections of wiring between units, ground wire and remote controller cable
① When connecting wires between units, ground wire or remote control wire, connect them according to the number of
terminals on the power source terminal block or signal terminal block in the control box. Connect the ground wire to the
ground terminal on the power source terminal block.
② Make sure to install an earth leakage breaker for the power source. Select a breaker for inverter circuit.
③ When the earth leakage breaker is exclusive for the earth leakage protection, it is necessary to connect also an isolating
switch (Switch + Class B fuse) or wiring circuit breaker in series to the earth leakage breaker.
④ Install the isolating switch close to the unit.
● Connect wires securing by tightening screws firmly. Confirm also no connector or wire
(from terminal) is disconnected in the control box.
● When installing an auxiliary electric heater, consult the electric heater manual or technical data.
Cabling system diagram
Outdoor unit
Power source
Earth leakage breaker
Circuit breaker
Ⓛ
Indoor unit1
Ⓝ
Earth
Remote control
Power source specifications
●
When connecting indoor units to the power source individually:
① Use of indoor unit's power source (Models other than ② – ③)
Model Leakage breaker Switch
capacity Fuse
capacity rating
22-36 types
45-56 types
15A 30mA 0.1sec 30A
71-90 types
112-160 types
② High static pressure duct, suction air processing unit, outdoor air processing unit with humidifier
45-90 types
112-160 types
15A 30mA 0.1sec
30A
224, 280 types
③ Floor type system package
112 types
15A 30mA 0.1sec
140, 160 types
30A
224, 280 types
20A 30mA 0.1sec
Note 1. The wire length is calculated with a voltage drop of 2%. If the wire length should exceed the above data, review the wire size to
use in accordance with extension wire regulations in your country.
Note 2. When total length of remote control cable is longer than 100 m, review the cable size according to
③ Remote control installation
●
When connecting multiple indoor units to one power source:
Total current Wire size Wire length
of indoor units (mm ) (m)
2
< 7A 2 21
< 11A 3.5 21
< 12A 5.5 33
< 16A 5.5 24
< 19A 5.5 20
< 22A 8 27
< 28A 8 21
89
- -
'21 • KX-T-386
Round crimp terminal
(Outdoor/indoor unit connection procedure)
Ⓐ Ⓑ
Signal line (between indoor and outdoor units)
Signal line
Ⓐ Ⓑ Ⓐ Ⓑ
Ⓛ
(between indoor unit)
Indoor unit2
Ⓝ
Ⓧ Ⓨ
Ⓧ Ⓨ
Remote
Remote
Earth control line
control line
Ⓧ Ⓨ Ⓧ Ⓨ
Remote control
Power source Wire Signal Remote control
wire size length cable
298m
275m
0.75~1.25mm 2
15A 2.0mm 2 ×2 0.3mm
×2
179m
123m
149m
0.75~1.25mm 2
85m
15A 2.0mm 2 ×2 0.3mm
×2
28m
51m
15A 2.0mm 2 ×2
0.75~1.25mm 2
34m
0.3mm
×2
20A 3.5mm 2 ×2 32m
.
Note 1. Wire length in the able is applicable when indoor units
Rated current of
wiring leakage breaker are connected in series. Wire size and length for each
range of total current of indoor units are calculated
20A
with a voltage drop of less than 2%. If the current
20A
should exceed values in the left table, review the wire
20A size to use in accordance with extension wire
regulations in your country.
30A
Note 2. During servicing (when the power source is turned
40A
off), refrain from taking power for indoor units in other
40A
refrigerant pipe system from the same power source.
50A
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