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

7

REFRIGERANT SYSTEM DIAGRAM

PKFY-P10VLM-(E/ET).TH
PKFY-P20VLM-(E/ET/DA/TH).TH
PKFY-P32VLM-(E/ET/DA/TH).TH
PKFY-P50VLM-(E/ET/DA/TH).TH
Heat exchanger
Room temperature detection thermistor
(TH21)
8

TROUBLESHOOTING

8-1. HOW TO CHECK THE PARTS
PKFY-P10VLM-(E/ET).TH
PKFY-P20VLM-(E/ET/DA/TH).TH
PKFY-P32VLM-(E/ET/DA/TH).TH
PKFY-P50VLM-(E/ET/DA/TH).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 9.6k"
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)
Linear expansion valve Disconnect the connector then measure the resistance valve with a tester. (Coil temperature 20:)
(LEV)
CN60
White
1
Yellow
2
(1)-(5)
Orange
3 White-Red
LEV
Blue
4
Red
5
Brown
6
1 Check if the drain float switch works properly.
Drain pump (DP)
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
2 Note: The drain pump for this model is driven by the internal DC motor, so it is not possible to
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
OCH710
Pipe temperature detection thermistor/gas
(TH23)
Pipe temperature detection thermistor/liquid
(TH22)
Strainer
(#100mesh)
Linear expansion
valve
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)-(6) (3)-(5)
Yellow-Brown Orange-Red
200 "±10%
measure the resistance between the terminals.
Normal
Other than short
Short
UP
Open Other than open
DOWN
– Short
Other than short
PKFY-P15VLM-(E/ET/DA/TH).TH
PKFY-P25VLM-(E/ET/DA/TH).TH
PKFY-P40VLM-(E/ET/DA/TH).TH
Gas pipe
Flare
Strainer
(#100mesh)
Liquid pipe
Strainer
(#100mesh)
PKFY-P15VLM-(E/ET/DA/TH).TH
PKFY-P25VLM-(E/ET/DA/TH).TH
PKFY-P40VLM-(E/ET/DA/TH).TH
Check points
-6
10
Red-Sky Blue
5-1
Red-Sky Blue
(4)-(6)
Blue-Brown
Drain float switch
Abnormal
connector terminal
1(+) – 2(-)
1(+) – 2(-)
3(+) – 4(-)
25
Unit: mm (inch)
{12.7 (1/2")
Gas pipe
{6.35 (1/4")
Liquid pipe
Switch
Magnet
Moving
Part