Mitsubishi Heavy Industries SRK Series Specifications download pdf (Page 43)

Current cut

[Open phase on compressor output

terminal, compressor lock]

(7) Inspection procedures corresponding to detail of trouble

Sensor error

[Broken sensor wire,

connector poor connection]

(Shortcircuit)

(Broken wire)

Is connector connection good?

YES

Replace PCB.

Correct connection.

Replace sensor.

Is sensor resistance value good?

◆ Sensor temperature characteristics

(Room temp., indoor unit heat exchanger

temp., outdoor unit heat exchanger

temp., outdoor air temp.)

Temperature (˚C)

Resistance (kΩ)

40 50 60

–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 sensor temperature characteristics

YES

¡ 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

Secure space for suction

and blow out.

If check results are normal,

compressor is locked.

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Mitsubishi Heavy Industries SRK Series Specifications Page 43

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