Refrigerant System Diagram; Troubleshooting - Mitsubishi Electric PKFY-P15VBM-E Technical & Service Manual

7

REFRIGERANT SYSTEM DIAGRAM

PKFY-P15, 20, 25VBM-E
PKFY-P20, 25VBM-ER1
PKFY-P15, 20, 25VBM-ER2
8

TROUBLESHOOTING

8-1. HOW TO CHECK THE PARTS
PKFY-P15, 20, 25VBM-E
PKFY-P20, 25VBM-ER1
PKFY-P15, 20, 25VBM-ER2
Parts name
Room temperature Disconnect the connector then measure the resistance with a tester.
thermistor (TH21)
(At the ambient temperature 10 ~30 )
Liquid pipe temperature
thermistor (TH22)
Gas pipe temperature
thermistor (TH23)
Vane motor (MV)
Measure the resistance between the terminals with a tester. (At the ambient temperature 25 )
4 Orange
M
Pink or
2
White
Red-Pink or White
1 Red
Yellow Blue
Connect pin No.
5 3
Fan motor (MF)
Measure the resistance between the terminals with a tester. (At the ambient temperature 20 )
FAN
1
White
Red
4
Black
6
Linear expansion
Disconnect the connector then measure the resistance valve with a tester.
valve (LEV) (Coil temperature 20 )
CN60
White
1
Yellow
2
Orange
3
LEV
Blue
White-Red
4
Red
5
Brown
6
OCH418B
Heat exchanger
Room temperature thermistor
TH21
Service ref.
Item
Gas pipe
Liquid pipe
Normal Abnormal
4.3k ~9.6k Open or short
Normal Normal
- -
Red-Blue Red-Orange
400 7%
Normal
White-Black 286
Red-Black 200
Normal
(1)-(5) (2)-(6)
Yellow-Brown Orange-Red
150 10%
Gas pipe temperature thermistor
TH23
Liquid pipe temperature thermistor
TH22
Strainer
(#100mesh)
PKFY-P15, 20, 25VBM-E
PKFY-P20, 25VBM-ER1
PKFY-P15, 20, 25VBM-ER2
{12.7 (1/2")
{6.35 (1/4")
Check points
Refer to the next page for the details.
- -
Red-Yellow
Open or short
Abnormal
Open or short
(3)-(5) (4)-(6)
Blue-Brown
Open or short
14
Gas pipe
Strainer
(#100mesh)
Liquid pipe
Linear expansion
valve
Strainer
(#100mesh)
Unit: mm(inch)
Abnormal
Abnormal
Flare