Emergency Operation Procedure; Self-Diagnosis; Wiring Diagram - Mitsubishi PLH-3AAK Technical & Service Manual

6

WIRING DIAGRAM

PLH-3AAK PLH-4AAK
PLH-3AAKH PLH-4AAKH PLH-5AAKH
[LEGEND]
SYMBOL NAME
P.B INDOOR POWER BOARD
I.B INDOOR CONTROLLER BOARD
FUSE FUSE(T6.3AL250V)
ZNR VARISTOR
BCR FAN CONTROL ELEMENT
CN2L CONNECTOR(LOSSNAY)
CN32 CONNECTOR(REMOTE SWITCH)
CN41 CONNECTOR(HA TERMINAL-A)
CN51 CONNECTOR(CENTRALLY CONTROL)
LED1 POWER SUPPLY(I.B)
LED2 POWER SUPPLY(R.B)
X1 RELAY(DRAIN PUMP)
X4 RELAY(FAN MOTOR)
SW1 SWITCH(MODEL SELECTION)WSee table 1
SW2 SWITCH(CAPACITY CORD)WSee table 2
SW5 SWITCH(SYSTEM SELECTION)WSee table 3
SW6 SWITCH(EMERGENCY OPERATION)
SWE CONNECTOR(EMERGENCY OPERATION)
GRILLE
MV MV MV MV
5 5 5
5
MF
1 2 3 6 7 4
1 2 3
1 2 3
DP
C
I.B
D.U.M D.HEATER
FAN 1 3 5 1 3 1
CNC(RED)
(WHT) CNP
(BLU)
X4
BCR
X4 X1 X1
HEATER
SWE SW1 SW2 SW5
CN24
ON
(YLW)
OFF
DS
Refer to tables
1. 2 and 3.
NOTES:
1.Symbols used in wiring diagram above are,
2.Indoor and outdoor connecting wires are made with polarities, make wiring
matching terminal numbers (1, 2, 3).
3.Since the outdoor side electric wiring may change be sure to check the outdoor
unit electric wiring for servicing.

[Self-diagnosis]

1.For details on how to operate self-diagnosis with the wireless remote control, refer to the
technical manuals etc.
2.For the wired remote control:When you quickly press twice the CHECK switch on the
remote control, the unit begins self-diagnosis.
and Check Codes generated in the past appear on the display.
For Check Codes and symptoms refer to the table below.
Check Code
Abnormality of room temperature thermistor (TH1).
P1
Abnormality of pipe temperature thermistor/Liquid (TH2).
P2
Abnormality of drain sensor (DS).
P4
Malfunction of drain-up machine.
P5
Freezing / overheating protection is working.
P6
Abnormality in outdoor unit. Refer to outdoor unit wiring diagram.
P8
E0-E5 Abnormality of the signal transmission between remote controller and indoor unit.
Fb Abnormality of indoor controller board.
No trouble generated in the past.
----
No corresponding unit.
FFFF
PLH-5AAK
SYMBOL
C CAPACITOR(FAN MOTOR)
MF FAN MOTOR
MV VANE MOTOR
H2 DEW PREVENTION HEATER
DP DRAIN-UP MACHINE
DS DRAIN SENSOR
TB2 TERMINAL BLOCK (POWER SUPPLY)
TB4 TERMINAL BLOCK (INDOOR/
OUTDOOR CONNECTING LINE)
TB5, TB6 TERMINAL BLOCK(REMOTE
CONTROLLER TRANSMISSION LINE)
TH1 ROOM TEMP.THERMISTOR
(0:/15k",25:/5.4k" DETECT)
TH2 PIPE TEMP.THERMISTOR/LIQUID
(0:/15k",25:/5.4k" DETECT)
R.B WIRED REMOTE CONTROLLER BOARD
CNSK
(RED)
CN2S
(WHT)
DC
2
5
H2
13.1V
1
8 9 5 10
5
VANE
3 1 3 1 3 POWER 1 2 1 1 2 2 3
CN6V
CND
POWER
POWER
OUTDOOR
(GRN)
(ORN)
CNDK
CN2D CN30
(RED)
(WHT) (BLK)
CN51 CN41 CN2L
ZNR
SW6
CN32
1 2
ON
LED2 LED1
OFF
D.SENSOR INTAKE LIQUID REMOCON
CN31 CN20 CN21 CN22
WIRELESS
(WHT) (RED) (WHT) (BLU)
CN90
1 2 3 1 2 1 2 1 2
(WHT)
TB5
2
TH1 1
TRANSMISSION WIRES
TH2
: Connector, : Terminal (block).
Symptom
PLH-6AAK
PLH-6AAKH
NAME
P.B
3
2
1
TB2
RED L
POWER SUPPLY
BLU N
~(1PHASE)
GRN/YLW 220-240V 50Hz
220V 60Hz
TB4
YLW 1
ORN 2
TO OUTDOOR UNIT
BRN 3
W.B
BZ
9
LED2 LED1
CNB
RU
SW1 SW2
R.B
1 2
TB6
DC12V
PLH - AAKH
C
( w i th h ea ter )
Pos i ti on of 88 H .
( for C on tr ol bo x)
TB4

[Emergency operation procedure]

1.When the wired remote control or the indoor unit microcomputer has failed,but all other compornents work
if you set the switch (SWE, SW6) on the indoor control board, the indoor unit will begin properly
Emergency Operation.
WNote on the wireless remote control: when the remote control does not function, it is possible to
activate Emergency Operation by using the indoor unit emergency operation switch (SW1,SW2 of the
wireless signal receiver board).
However,if the indoor unit microcomputer has failed,it is nesessary to proceed with points 2 and
3 below as in the case of the wired remote controller.
2.When you activate emergency operation of the cooling or heating, you have to set the switch (SWE) and
switch (SW6) on the indoor controller.
SWE : ON • Indoor fan is running at high speed. • Drain-up machine is working.
SW6-1 : ON • Emergency operation of cooling mode.
SW6-1,2 : ON • Emergency operation of heating mode.
3.Before you activate emergency operation, check the following points:
(1) Emergency operation cannot be activated when:
• the outdoor unit malfunctions. • the indoor fan malfunctions.
• when it has detected the malfunction of drain-up machine during self-diagnosing.
(2) Emergency operation becomes continuous only by switching the power source on/off. ON/OFF on the
remote control or temperature control etc,dose not function.
(3) Avoid operating for a long time when the outdoor unit begins defrosting while emergency operation of
the heating is activated, because it will start to blow cold air.
(4) Emergency cooling should be limited to 10 hours maximum (The indoor unit heat exchanger may freeze).
(5) After emergency operation has been deactivated, set the switches etc.to their original positions.
(6) Movement of the vanes does not work in emergency operation, therefore you have to slowly set them
manually to the appropriate position.
31
SYMBOL NAME
W.B WIRELESS REMOTE CONTROLLER BOARD
RU RECEIVING UNIT
BZ BUZZER
LED1 LED(RUN INDICATOR)
LED2 LED(HOT ADJUST)
SW1 SWITCH(HEATING ON/OFF)
SW2 SWITCH(COOLING ON/OFF)
HEATER
FS1 THERMAL FUSE(72:, 16A)
FS2 THERMAL FUSE(104:, 16A)
H1 HEATER
26H HEATER THERMAL SWITCH
88H HEATER CONTACTOR
Table 1 Table 3
SW1 SW5
MODELS MODELS
Manufacture/Service Manufacture/Service
1 2 3 4 5 1 2 3 4 5 6 7 8
PLH-AAK ON PLH-AAK
OFF
1 2 3 4 5
1 2 3 4 5 6 7 8
PLH-AAKH ON PLH-AAKH
OFF
Table 2
SW2
MODELS Manufacture/Service MODELS Manufacture/Service
1 2 3 4 5 1 2 3 4 5
PLH-3AAK PLH-5AAK
ON
PLH-3AAKH PLH-5AAKH
OFF
1 2 3 4 5 1 2 3 4 5
PLH-4AAK PLH-6AAK
ON
PLH-4AAKH PLH-6AAKH
OFF
[PLH-AAKH models only]
TB2 88H
FS1
L
RED RED RED
POWER SUPPLY
1
~(1PHASE)
N BLU WHT
2
220-240V 50Hz
GRN/YLW
220V 60Hz
HEATER CN24
(YLW)
1 2
I.B
88H
88H
Please set the voltage using the
remote controller.
For the setting method. please refer to
the indoor unit Installation Manual.
TB2
ON
OFF
ON
OFF
ON
OFF
ON
OFF
H1
FS2
26H
WHT
6
GRY WHT
5