Mitsubishi Electric PUHZ-SW50VHA Service Manual download pdf (Page 36)

10-8. HOW TO CHECK THE COMPONENTS

Low temperature thermistors

• Thermistor <Liquid> (TH3)

• Thermistor <2-phase pipe> (TH6)

• Thermistor <Ambient> (TH7)

0: 15k'

10: 9.6k'

20: 6.3k'

25: 5.2k'

0: 180k'

25: 50k'

50: 17k'

70: 8k'

90: 4k'

30: 4.3k'

40: 3.0k'

Thermistor R0 = 15k' ± 3%

B constant = 3480 ± 2%

t =15exp{3480(

273+t

–

273

)}

Thermistor R50 = 17k' ± 2%

B constant = 4150 ± 3%

t =17exp{4150(

273+t

–

323

)}

Thermistor R120 = 7.465k' ± 2%

B constant = 4057 ± 2%

t =7.465exp{4057(

273+t

–

393

)}

1 1

Medium temperature thermistor

• Thermistor <Heatsink> (TH8)

20: 250k'

30: 160k'

40: 104k'

50: 70k'

60: 48k'

70: 34k'

80: 24k'

90: 17.5k'

100: 13.0k'

110: 9.8k'

High temperature thermistor

• Thermistor <Discharge> (TH4)

• Thermistor <Comp.surface> (TH34)

-20 -10 0 10 20 30 40 50

Temperature ()

Resistance (k)

200

150

100

25 50 75 100 125

Temperature ()

Resistance (k)

500

400

300

200

100

50 75 100 120

Temperature ()

Resistance (k)

OCH525

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 59 60

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Mitsubishi Electric PUHZ-SW50VHA Service Manual Page 36

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