Mitsubishi Electric City Multi Series User Manual

31
OCH610G
31
9
TROUBLESHOOTING
9-1. HOW TO CHECK THE PARTS
PLFY-EP06NEMU-E PLFY-EP08NEMU-E PLFY-EP12NEMU-E PLFY-EP15NEMU-E
PLFY-EP18NEMU-E PLFY-EP18NEMU-E1 PLFY-EP24NEMU-E PLFY-EP30NEMU-E
PLFY-EP36NEMU-E PLFY-EP48NEMU-E
Parts name Checkpoints
Room temperature
detection thermistor (TH21)
Pipe temperature detection
thermistor/liquid (TH22)
Pipe temperature detection
thermistor/gas (TH23)
Disconnect the connector then measure the resistance with a tester. (At the ambient temperature 50 to 86 °F)
Normal Abnormal
WR Open or short
Fan motor (MF) Refer to “9-1-3. DC Fan motor (fan motor/indoor controller board)”.
Vane motor (MV) Measure the resistance between the terminals with a tester. (At the ambient temperature of 68 to 86 °F)
Connector Normal Abnormal
Red–Yellow (
5
–
3
,
0
–
8
,
5
–
3
,
)
–
8
)
300

 Open or short
Red–Blue (
5
–
1
,
0
–
6
,
5
–
1
,
)
–
6
)
Red–Orange (
5
–
4
,
0
–
9
,
5
–
4
,
)
–
9
)
Red–White (
5
–
2
,
0
–
7
,
5
–
2
,
)
–
7
)
Drain pump (DP)
1
&KHFNLIWKHGUDLQÀRDWVZLWFKZRUNVSURSHUO\
2
Check if the drain pump works and drains water properly in cooling operation.
3
,IQRZDWHUGUDLQVFRQ¿UPWKDWWKHFKHFNFRGHZLOOQRWEHGLVSOD\HGPLQXWHVDIWHUWKHRSHUDWLRQVWDUWV
Note: The drain pump for this model is driven by the internal DC motor, so it is not possible to
measure the resistance between the terminals.
Normal
5HG±%ODFN,QSXW9'&ĺ7KHSXPSPRWRUVWDUWVWRURWDWH
Purple–Black: Abnormal (check code 2502) if it outputs 0–13 V square wave (5 pulses/rotation), and the number of rotation is not normal.
'UDLQÀRDWVZLWFK)6 Measure the resistance between the terminals with a tester.
State of moving part Normal Abnormal
UP Short Other than short
DOWN Open Other than open
3D i-see Sensor Turn the power ON while the i-see Sensor connector is connected to the CN4Z on indoor controller board.
A communication between the indoor controller board and i-see Sensor board is made to detect the connection.
Normal: When the operation starts, the motor for i-see Sensor is driven to rotate the i-see Sensor.
Abnormal: The motor for i-see Sensor is not driven when the operation starts.
Note: The voltage between the terminals cannot be measured accurately since it is pulse output.
i-see Sensor motor (MT)
(Option)
Measure the resistance between the terminals with a tester. (At the ambient temperature of 68 to 86°F)
Connector Normal Abnormal
Red–Yellow
Red–Blue
Red–Orange
Red–White
250  Open or short
Linear expansion valve
(LEV)
Disconnect the connector then measure the resistance with a tester. (At the coil temperature 50 to 86 °F)
Connector Normal Abnormal
White–Red
Yellow–Brown
Orange–Red
Blue–Brown
200  ± 10% Open or short
MV
YE
BU
RD
OG
WH
RD
VT
BK
1
2
3
2
1
Moving part
4
3
Switch
Magnet
Moving
Part
4321
43 1
2
BK BK BK BK
OG
RD
WH
BU
YE
M
LEV
BN
CN60
BU
1
2
3
4
5
6
OG
WH
RD
YE
Refer to “9-1-1. Thermistor”.
Refer to “9-1-2. Linear expansion valve”.

Mitsubishi Electric City Multi Series Specifications

General

Refrigerant	R410A
Control	Centralized control, individual control
Indoor Unit Types	Ceiling Cassette, Ceiling Suspended, Wall Mounted
Power Source	Electric
Piping Length	Up to 1000m total piping length (depending on the model)
Height Difference	Up to 50m