Mitsubishi Heavy Industries KXZ Series User Manual

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'21 • KX-T-380
8.4 Outdoor unit control PCB exchange procedure
Exchange the Control PCB (Fig.1) according to the following procedure.
1.
Exchange the PCB after elapsing 3 minutes from power OFF. (Even after the breaker
Have been turned off, some capacitors still hold high voltage. This condition is very
dangerous to touch PCB.)
Be sure that the voltage (DC) is under 30 V before harnesses
disconnect from PCBs. (Refer to Fig.2.)
2. Remove the connectors from the former Control PCB. Also, reconnect the jumper
connectors of CNS1 and CNS2 to same position of the new Control PCB.
(Except when jumper connectors are not plug into CNS1 and CNS2.) Outdoor unit cannot
restart if the jumper connectors are misconnected.
3. Exchange to the new PCB after match the switches (SW1-6, 10, 11) and jumper wires
(J11-18) of the new PCB to the same setting as the former PCB.
4. Reconnect the connectors as before. ( Be sure that there are not half inserted connectors .)
WARNING
CAUTION
PCB012D105
Fig.1 Parts arrangement
Parts No.
CNF1
CNF2
CNU1
CNB2
CNB3
CNB4
CNS2
CNG1
CNG2
CNS1
CN26
CNG3
CN22
CNI3
CNI1
Never plug connectors
in half inserted
CNP2 CNTH1 CNL2 CNL1 CN20 CNDRM CNL3
CNX5
CNX4
CNX3
CNX2
CNX1
CN15
CN16
CNP1
CNC2
CNU2
CN21
CNEEV1
CNEEV3
CNEEV4
CNEEV2
CNE1
CNK3
CNK1
CNFAN3
J11-18
SW1-6
SW10,11
Fig.2 PCB mounting position and voltage measurement points
Power PCB
Control PCB
After elapsing 3 minutes
from power OFF
Be sure that the voltage (DC) is under 30 V
Voltage (DC) measurement points
: J101 and J102 on the Power PCB
*Presence and shape
of electric component
may vary according to
model.
LED1
(Red)
LED2
(Green)
LED3
(Green)
Precautions for Safety
• Since the following precaution is the important contents for safety, be sure to observe them.
WARNING and CAUTION are described as follows:
Indicates an imminently hazardous situation which will result in death or serious injury if
proper safety procedures and instructions are not adhered to.
Indicates a potentially hazardous situation which may result in minor or moderate injury if
proper safety procedures and instructions are not adhered to.
WARNING
• Securely exchange the PCB according to this procedure.
If the PCB is incorrectly exchanged, it will cause an electric shock or re.
• Be sure to check that the power source for the outdoor unit is turned OFF before exchanging the PCB. The
PCB exchange under current-carrying will cause an electric shock or re.
• After nishing the PCB exchange, check that wiring is correctly connected with the PCB before power
distribution. If the PCB is incorrectly exchanged, it will cause an electric shock or re.
CAUTION
• Band the wiring so as not to tense because it will cause an electric shock.

Mitsubishi Heavy Industries KXZ Series Specifications

General

Brand	Mitsubishi Heavy Industries
Model	KXZ Series
Category	Air Conditioner
Language	English