Indoor Unit Pcb Replacement Procedure - Mitsubishi Heavy Industries KX6 Series Technical Manual

9.2 Indoor unit PCB replacement procedure

(1) Control PCB
Read the "SAFETY PRECAUTIONS" carefully first of all and then strictly follow it during the replacement in order to protect yourself.
●
The precautionary items mentioned below are distinguished into two levels, WARNING and CAUTION.
●
Both mentions the important items to protect your health and safety so strictly follow them by any means.
Wrong installation would cause serious consequences such as injuries or death.
WARNING
Wrong installation might cause serious consequences depending on circumstances.
CAUTION
After completing the replacement, do commissioning to confirm there are no abnormalities.
●
WARNING
Replacement should be performed by the specialist.
●
If you replace the PCB by yourself, it may lead to serious trouble such as electric shock or fire.
Replace the PCB correctly according to these instructions.
●
Improper replacement may cause electric shock or fire.
Shut off the power before electrical wiring work.Start the work after elapsing 1 minutes or more from power off.
●
Replacement during the applying the current would cause the electric shock, unit failure or improper running.
It would cause the damage of connected equipment such as fan motor,etc.
Fasten the wiring to the terminal securely, and hold the cable securely so as not to apply unexpected stress on the terminal.
●
Loose connections or hold could result in abnormal heat generation or fire.
Check the connection of wiring to PCB correctly before turning on the power, after replacement.
●
Defectiveness of replacement may cause electric shock or fire.
CAUTION
In connecting connector onto the PCB, connect not to deform the PCB. It may cause breakage or malfunction.
●
Insert connecter securely, and hook stopper. It may cause fire or improper running.
●
Bundle the cables together so as not to be pinched or be tensioned. It may cause malfunction or electric shock for disconnection or deformation.
●
Replace and set up the PCB according to this instruction.
①Set to an appropriate address and function using switch on PCB.
Select the same setting with the removed PCB.
Item Switch
SW1,2(Blue)
OFF
Address
SW5-2
ON
SW3,4(Green)
②Set to an appropriate capacity using the model selector switches (SW6).
Select the same setting with the removed PCB.
SW6
Setting
model -1 -2 -3 -4
22
－ － － －
28
－ － －
〇
36
－ － －
〇
45
－ － －
〇
56
－ －
〇 〇
71
－ － －
〇
③Replace the PCB
1. Exchange PCB after detaching all connectors connected with the PCB.
2. Fix the PCB so as not to pinch the wirings.
3. Connect connectors to the PCB. Match the wiring connector to the connector color on the PCB and connect it.
④Control PCB
Parts mounting are different by the kind of PCB.
Address setting
SW1,2（Blue）
Indoor unit
SW3,4（Green）
Outdoor unit
CNE（White）
RAM checker
SW6
Capacity setting
SW7
Function setting
CNN（Yellow）
Thermistor
(Heat exchanger)
CNH（Black）
Thermistor
(Return air)
CNF（Yellow）
Thermistor
CNTA（Blue）
(Air supply)
External input
SAFETY PRECAUTIONS
Content of control
Indoor unit address : 00～99
Indoor unit address : under 100
Indoor unit address : 100 or more
Outdoor unit address
SW6
Setting
model -1 -2 -3 -4
90
－ －
〇 〇
112
－
〇 〇 〇
140
－ －
〇 〇
160
－
〇 〇 〇
CNZ（White）
CNJ（White）
HA
Louver motor
CNC（Red） CNA（Red）
Humidity Expansion
sensor valve
CNI（Blue）
Float SW
Item Switch
Superlink
SW5-1
setting
SW7-1
Test run
〇: ON － : OFF
SW6
ON
1 2 3 4
Example setting for 56.
CNT（Blue） CNV（White）
External control Auto lift
CNO（Red） CNV2（Black）
Heater Auto clean
output
CND（Black）
CNT2（Red）
Ventilation
Branching
unit controller

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'11 • KX-T-165
PSB012D991
Content of control
OFF Automatic adjustment
Fixed previous version of Superlink protocol
ON
OFF Normal
Operation check/drain motor test run
ON
CNK1（White）
CNK2（Black）
Superlink
Superlink(spare)
spare
CNR（White）
Drain motor
CNW2（White）
Power PCB
Part number
CNB（White）
Remote
panel controller