Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 55

1.9.2 Electric wiring work installation
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
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fire caused by overheating or short-circuit.
Be sure to have the electric 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. (
●
Switch No. Control Content
SW2 Indoor unit address (0-Fh)
SW5-1
Master/Slave Switching (plural /Slave unit Setting)
SW5-2
Model capacity setting
SW6-1 ～ 4
ON Operation check, Drain motor test run
SW7 － 1
OFF Normal operation
Always do it according to the instruction.
WARNING
CAUTION
is the default setting)
Electrical wiring connection
● Electrical wiring work must be performed by an electlician 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 source 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 Connect the power source to the outdoor unit.
③ 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 (sensitivity current: 30 mA) 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 source, remote controller, 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 supply 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 control 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.
Cable connection for single unit installation
①As for connecting method of power source, select from following connecting patterns. In principle, do
not directly connect power souce line to inside unit.
As for exceptional connecting method of power source, discuss with the power provider of the
country with referring to technical documents, and follow its instruction.
② For cable size and circuit breaker selection, refer to the outdoor unit installation manual.
Single-phase model
Power source
Earth leakage breaker r k
Circuit breaker
Power source line
L N
Earth
Outdoor Unit
Indoor-Outdoor Connecting line
Indoor Unit
Remote control line
Remote control
Cable connection for a V multi configuration installation
① Connect the same pairs number of terminal block "
master and slave indoor units.
② Do the same address setting of all inside units belong to same refrigerant system by rotary
switch SW2 on indoor unit's PCB (Printed circuit board).
③ Set slave indoor unit as "slave 1" through "slave 3" by address switch SW5-1, 5-2 on PCB.
④ When the button on the remote control unit is pressed after turning on the power, an
AIR CON NO.
indoor unit's address number will be displayed. Do not fail to confirm that the connected indoor
unit's numbers are displayed on the remote control unit by pressing the
Power source
Earth leakage breaker
(Factory setting: "Master")
Circuit breaker
Earth
Outdoor Unit
Indoor Unit Master Indoor Unit
Remote control line (no pola rity)
Remote control
54
- -
'19 • PAC-T-327
Round crimp terminal
Three-phase model
Doner source
Earth leakage breaker Earth leakage breaker
Circuit breaker
Power source line
Earth
Outdoor Unit
Indoor-Outdoor Connecting line
Indoor Unit
Remote control line
Remote control
① ② ③ "and " X and Y " between
, ,and
Method of setting Master/Slave of indoor unit
Indoor Unit Master Slave 1 Slave 2
SW5-1 OFF OFF
PCB
SW
SW5-2 OFF ON
Twin type Triple type
Earth Earth
Slave 1 Indoor Unit Slave 2
PSC012D049
PSC012D117
201609
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