Refrigerant System Diagram; Troubleshooting - Mitsubishi Electric CITY MULTI PKFY Series Technical & Service Manual

7

REFRIGERANT SYSTEM DIAGRAM

PKFY-WL10VLM-E.TH
PKFY-WL20VLM-E.TH
PKFY-WL32VLM-E.TH
Heat exchanger
Room temperature
detection thermistor TH21
8

TROUBLESHOOTING

8-1. HOW TO CHECK THE PARTS
PKFY-WL10VLM-E.TH
PKFY-WL20VLM-E.TH
PKFY-WL32VLM-E.TH
Parts name
Room temperature Disconnect the connector then measure the resistance with a tester.
detection thermistor (TH21)
(At the ambient temperature 10 to 30:)
Pipe temperature detection
thermistor/liquid (TH22)
Normal
Pipe temperature detection
4.3 to 9.6 k"
thermistor/gas (TH23)
Vane motor (MV1)
Measure the resistance between the terminals with a tester. (At the ambient temperature 25:)
7 Sky Blue
M
-9
10
9 Sky Blue
Red-Sky Blue
Red
10
Sky Sky
Blue Blue
Connector(CNV)
6 8
pin No.
Vane motor
Measure the resistance between the terminals with a tester. (At the ambient temperature 25:)
(Lower (MV2))
2 Sky Blue
M
5-4
4 Sky Blue
Red-Sky Blue
Red
5
Sky Sky
Blue Blue
Connector(CNV)
1 3
pin No.
Fan motor (MF) Refer to "8-1-3. DC Fan motor (fan motor/indoor controller board)
Flow control valve
Disconnect the connector then measure the resistance between terminals with a tester.
(FCV) CN8A
Refer to the next page for details.
Yellow
1
Orange
2
Red
3
Green
4
1-5
M
Blue
5
Yellow-Blue
Purple
FCV 6
(Optional parts) White
7
Gray
8
Drain pump (DP) 1 Check if the drain float switch works properly.
2 Check if the drain pump works and drains water properly in cooling operation.
3 If no water drains, confirm that the check code 2502 will not be displayed 10 minutes after the operation starts.
1
RD
Note: The drain pump for this model is driven by the internal DC motor, so it is not possible to
2
VT
3
BK
Normal
(Optional parts)
Red–Black: Input 13 V DC → The pump motor starts to rotate.
Drain float Measure the resistance between the terminals with a tester.
switch (FS)
State of moving part
Moving part
1
2
3
(Optional parts) 4
OCH711
PKFY-WL15VLM-E.TH
PKFY-WL25VLM-E.TH
PKFY-WL40VLM-E.TH
Pipe temperature detection
thermistor/ inlet
TH22
Manual air purge valve
Pipe temperature detection
thermistor/ outlet
TH23
PKFY-WL15VLM-E.TH
PKFY-WL25VLM-E.TH
PKFY-WL40VLM-E.TH
Refer to "8-1-1. Thermistor".
Normal
-8 -7
10 10
Red-Sky Blue Red-Sky Blue
300 " ±7%
Normal
5-3
5-2
Red-Sky Blue
Red-Sky Blue
300 ±26.3 "
Normal
2-5 3-5
Orange-Blue Red-Blue
55 " ±5.6 " (at 25℃）
measure the resistance between the terminals.
Normal
Other than short
UP Short
Open Other than open
DOWN
Short
– Other than short
Water inlet
connection
Model
Item
Water inlet
Water outlet
Water outlet
connection
Check points
-6
10
Red-Sky Blue
5-1
Red-Sky Blue
Abnormal
4-5
Green-Blue
Open or short
Drain float switch
Abnormal
connector terminal
1(+) – 2(-)
1(+) – 2(-)
3(+) – 4(-)
19
Unit: in
PKFY-WL10/15/20/25/32/40VLM-E
Rc3/4 screw
Rc3/4 screw
Switch
Magnet
Moving
Part