Daikin GYEQ20AN, Руководство по обслуживанию

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SiAUY361411EA Inspecting the Outdoor Unit
Parts Inspection 198
1.33 Inspecting the Refrigerant System Sensors
„
Inspecting the high pressure switch
Check the continuity between terminals. There should be continuity while stopped.
„
Inspecting the pressure sensors
For each of the high and low refrigerant pressures, get the sensor value and actually measured
value by checking the refrigerant pressure with the outdoor unit's onboard checker and
measuring the refrigerant pressure with a manifold gauge. If the two values are approximately
equal, it means that the refrigerant pressure is normal.
[High pressure sensor]
You can convert the output voltage of the high pressure sensor into the equivalent pressure
using the table on
page 226 . The input voltage is 5 V (constant) when measured between the
main circuit board's CN4-2 (black) and -3 (red).
[Low pressure sensor]
You can convert the output voltage of the low pressure sensor into the equivalent pressure
using the table on
page 226 . The input voltage is 5 V (constant) when measured between the
main circuit board's CN4-5 (black) and -6 (red).
„
Inspecting the discharge temperature sensor
Measure the resistance between terminals. If the actually measured value is approximately
equal to the checker value, it means that the sensor is normal.
„
Inspecting the intake air temperature sensor
Measure the resistance between terminals. If the actually measured value is approximately
equal to the checker value, it means that the sensor is normal.
„
Inspecting the outdoor air temperature sensor
Measure the resistance between terminals. If the actually measured value is approximately
equal to the checker value, it means that the sensor is normal.
„
Inspecting the oil temperature sensor
Measure the resistance between terminals. If the actually measured value is approximately
equal to the checker value, it means that the sensor is normal.
Working pressure characteristics (factory default settings)
Type Circuit open Circuit closed
HPS1/2 4.0 MPa 3.15±0.15 MPa
High pressure sensor Pressure range
0 to 4.15 MPa
Low pressure sensor Pressure range
0 to 3.33 MPa
+0
-0.15
025958-00X
Connector
(red)
023465-00E
Connector
(white)
023466-00E