Mitsubishi SRK25ZD-S User Manual

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(7) Inspection procedures corresponding to detail of trouble
Thermistor error
[Broken thermistor wire,
connector poor connection]
(Shortcircuit)
(Broken wire)
Current cut
[Open phase on compressor output
terminal, compressor lock]
YES
YES
NO
NO
YES
NO
¡ Check compressor wiring visually.
¡ Check insulation resistance. (1 MΩ or over)
¡ Check coil wire resistance. (Few Ω)
Does current cut operate when
operating inverter with compressor
wire disconnected?
Is output voltage applied to all 3
phases of power transistor?
Is there any shortcircuit?
Inspect compressor.
Defective inverter
Defective inverter
Secure space for suction
and blow out.
If check results are normal,
compressor is locked.
Is connector connection good?
YES
YES
NO
NO
Replace PCB.
Correct connection.
Replace thermistor.Is thermistor resistance value good?
◆ Thermistor temperature characteristics
(Room temperature, indoor unit heat
exchanger temperature, outdoor unit
heat exchanger temperature, outdoor
temperature)
Temperature (˚C)
Resistance (kΩ)
30
25
20
15
10
5
30
20
10
40 50 60
70
0
–10
Temperature (˚C) Resistance (kΩ) Temperature (˚C) Resistance (kΩ)
0 164 70 8.7
5 127 75 7.3
10 99 80 6.2
15 78 85 5.3
20 62 90 4.5
25 50 95 3.9
30 40 100 3.3
35 32 105 2.9
40 26 110 2.5
45 21 115 2.2
50 17 120 1.9
55 14 125 1.6
60 12 130 1.4
65 10 135 1.3
◆ Discharge pipe thermistor temperature characteristics

Mitsubishi SRK25ZD-S Specifications

General

Brand	Mitsubishi
Model	SRK25ZD-S
Category	Air Conditioner
Language	English