Refrigerant System Diagram; Troubleshooting - Mitsubishi Electric PKFY-P20VAM-E Technical And Service Manual

6

REFRIGERANT SYSTEM DIAGRAM

PKFY-P20VAM-E
PKFY-P25VAM-E
Item
Gas pipe
Liquid pipe
7

TROUBLESHOOTING

7-1. HOW TO CHECK
PKFY-P20VAM-E PKFY-P25VAM-E
Parts name
Room temperature Disconnect the connector then measure the resistance using a tester.
thermistor (TH21)
(Surrounding temperature 10:~30:)
Liquid pipe temperature
thermistor (TH22)
4.3k"~9.6k"
Gas pipe temperature
thermistor (TH23)
Vane motor Measure the resistance between the terminals using a tester. (Surrounding temperature 25:)
3
Blue
M
5 Yellow
Red-Pink
1 Red
Orange Pink
Connect pin No.
4 2
1 Measure the resistance between the terminals using a tester. (Surrounding temperature 20:)
Fan motor
FAN
1
White
2 Without disassembling the parts, measure the electrical pressure of the gray wire (Signal line) and
Red
4
brown wire (GND) while the power is on.
Black
6
Brown Gray Yellow
3 2 1
CN34
Linear expansion
Disconnect the connector then measure the resistance valve using a tester.
valve (Coil temperature 20:)
CN60
White
1
Yellow
2
Orange
3
LEV
Blue
White-Red
4
Red
5
Brown
6
Heat exchanger
Room temperature thermistor
TH21
Models
PKFY-P20VAM-E PKFY-P25VAM-E
Normal Abnormal
Open or short
Normal Normal
1-2 1-3
Red-Blue Red-Orange
200" ±7%
Normal
White-Black
195"
Red-Black
200"
(1) At first, check if the electrical pressure is 12V between the brown wire (GND)
and yellow wire (VCC).
Normal
(2) Slowly start running the fan. It is normal if while the fan rotate once, the
electrical pressure change from 0V to12V then go back to 0V.
If the electrical pressure stay at around 0V or 10V, it means the fan motor has
Abnormal
the defects.
Normal
(1)-(5) (2)-(6) (3)-(5)
Yellow-Brown Orange-Red
150" ±10%
Gas pipe temperature thermistor
TH23
Liquid pipe temperature thermistor
TH22
{12.7 (1/2")
{6.35 (1/4")
Check points
Refer to the next page for the details.
Abnormal
1-4 1-5
Red-Yellow
Open or short
Abnormal
Open or short
Abnormal
(4)-(6)
Blue-Brown
Open or short
12
Gas pipe
Strainer
(#50mesh)
Liquid pipe
Linear expansion
valve
Strainer
(#100mesh)
Flare