Mitsubishi Heavy Industries 140KXZEN1 Service Manual Download

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A signal cable system is operated at DC5V, so never connect it to the power source 220/240V or 380/415V.

If the power source is applied, a protective fuse

provided on the board will be actuated. If the protective fuse is actuated, follow the procedure set out below.

(1) Turn off power and make sure that 220/240V or 380/415V is not applied to signaling wires.
(2) In the case of an indoor unit, switch from CNK1 to CNK2 and cut the jumper line JSL1.
(3) In the case of an outdoor unit, switch from CNX1 to CNX2 and cut the jumper line J10.
(4) Check signal cable terminal block resistance before you turn on power. If the resistance value is 100 ohms or less, there is possibility that a power cable is connected to a

signal cable terminal block.

A typical resistance value is [46000 / (No. of connected FD

○

△△

KXE4 and KXE5 series units x 5) + (No. of connected FD

○△△

KXE6 and KXZ series units x 9)].

If the resistance value is 100 ohms or less, tentatively detach signal cables and thus, divide the network into more than one block (to reduce the number
of indoor units connected in a network) to check for cabling errors in each such block.

Signal line

(mm

)

20A, 30mA

less than 0.1 sec

3.5

5.5

30A, 30mA

less than 0.1 sec

40A, 30mA

less than 0.1 sec

112KXZEN1
140KXZEN1
155KXZEN1
112KXZES1
140KXZES1
155KXZES1

Single-phase

220/240V 50Hz

220V 60Hz

Three-phase

380/415V 50Hz

380V 60Hz

20A, 30mA

less than 0.1 sec

3.5

Round crimp
contact terminal

Crimp

contact terminal

Diameter of a cable:thin

Diameter of a cable:thick

Wire

(1) Method of leading out cables

●

As shown on the drawing in Section 4-2, cables can be laid through the front, right, left or bottom casing.

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In wiring on the installation site, cut off a half-blank covering a penetration of the casing with nippers.

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In the case of an installation using a collective drain system, use a port other than the bottom one to take out cables and pipes.

If the bottom port is used, seal it thoroughly so that drain water may not spill out.

(2) Notabilia in connecting power cables

●

Connect the ground wire before you connect the power cable. When you connect a grounding wire to a terminal

block, use a grounding wire longer than the power cable so that it may not be subject to tension.

●

Do not turn on power until installation work is completed. Turn off power to the unit before you service the unit.

●

Always connect power cables to the power terminal block.

●

To connect a cable to the power terminal block, use a round crimp contact terminal.

If two cables are to be connected to one terminal, arrange cables in such a manner that you put their crimp

contact terminals together back to back. Further, put the thinner cable above the thicker one in arranging cables

for such connection.

●

Use specified wires in wiring, and fasten them securely in such a manner that the terminal blocks are not

subject to external force.

●

In fastening a screw of a terminal block, use a correct-size driver.

Fastening a screw of a terminal block with excessive force can break the screw.

●

When electrical installation work is completed, make sure that all electrical components within the electrical

component box are free of loose connector coupling or terminal connection.

Method of connecting power cables

Model

Power source

Cable size for

power source (mm

)

Wire length

(m)

Rated current

Switch capacity

Size (mm

)

Screw type

Moulded-case circuit breaker (A)

Earth wire

Earth leakage breaker

2 cores

0.75

※

Rated current Switch capacity

Moulded-case circuit breaker (A)

Earth leakage breaker

outdoor-indoor

indoor-indoor

Combined total capacity

of indoor units

Cable size for

power source(mm

)

Wire length(m)

Please note

a) The method of laying cables has been determined pursuant to the Japanese indoor wiring regulations (JEAC8001). (Please adapt it to the regulations in

effect in each country)

b) Wire length in the table above is the value for when the indoor unit is connect to the power cable in series also the wire size and minimum length when the

power drop is less than 2% are shown. If the current exceeds the value in the table above, change

the wire size according to the indoor wiring regulations.

(Please adapt it to the regulations in effect in each country.)

c) For details, please refer to the installation manual supplied with the indoor unit.

The communication protocol can be choosen from following two types. One of them is the conventional Superlink (hereinafter previous SL) and the other is the new

Superlink

Ⅱ

(hereinafter new SL) . These two communication protocols have the following advantages and restrictions, so please choose a desirable one meeting your

installation conditions such as connected indoor units and central control. When signal cables are connected into a network involving outdoor units, indoor units or central

control equipment that do not support new SL, please select communications in the previous SL mode, even if the refrigerant system is separated from theirs.

How to connect signal cables

Outdoor unit setting (SW5-5)
No. of connectable indoor units in a network
No. of connectable outdoor units in a network
Signal cable (total length)

Signal cable (furthest length)
Connectable units to a network

ON
Max. 48
Max. 48

Up to 1000m

Up to 1000m
Units not supporting new SL (FD

○A△△KXE4

series)

Units supporting new SL (FD

○△△KXE6

series)

Can be used together. (*1)