Zanotti un0 010, Workshop Manual

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Electronics and wiring
5.3 Digital Sensors
PO Oil Pressure Switch
Specifications:
Circuit unipolar
State N.O.
Opens at < −0.3 ± 0.1barg (4 ± 2psig)
Connections:
Port-Pin by Wire
J10 − 11th NE1011
J8 − 9th 14
Functions:
Pressure Switch PO trips when engine oil pressure drop
below − 0.3barg − (4.4psig), thus oil is not flowing, and
A10 Alarm occurs permanently stopping unit.
Digital Input menu label: Oil Pressure
Testing procedure:
Disconnect the connector from the oil pressure switch. Keep the voltameter probes in contact with the switch terminal and
cylinder block while operating the engine. It is abnormal if circuit is closed.
Replacement: For PO Oil pressure switch replacement procedure refer to 4.2.3
Alarm: A10 - Oil Pressure
FTS1-2 Defrost End Temperature Switches
Specifications:
Circuit unipolar
State N.O.
Closes at < +2°C (35.6°F )
Reopens at > +8°C (46.4°F )
Connections:
Port-Pin by Wire
J10 − 7th NE107
J8 − 14th 43
Functions:
Temperature Switches FTS1 and FTS2 manage defrost-end checking evaporator temperature, when they both reveal a
positive temperature all evaporator ice is melted and CPU board stops defrost.
Digital Input menu label: Clixon