York YCAV0569 Installation Operation & Maintenance page 190

MICRO PANEL
Sensor Failure Cutout Fault
The Sensor Failure Cutout prevents the system from
running when a critical sensor (transducer, level sen-
sor, or motor winding temp sensor) is not functioning
properly and reading out of range. This safety is checked
at start-up and will prevent the system from running if
one of the sensors has failed.
The sensor failure safety will also fault and shutdown
a system while in operation, if a safety threshold is
exceeded or a sensor reads out of range (high or low).
Following is the Status display fault message.
SYS X YYYYYYYY SENSOR FAILURE:
ZZZZZZZZZZZZ
X indicates the specific system.
YYYYYYYY will either indicate the
system is in a "FAULT" condition and
will restart when the fault clears, or
"LOCKOUT" after 3 faults and will
not restart until the operator clears the
fault using the keypad.
ZZZZZZZZZZZ indicates the failed sensor below:
· SUCT PRESS
· OIL PRESS
· DSCH PRESS
· LEVEL SENSOR
· MOTOR TEMP X *
*The Unit Setup Mode allows a spe-
cific motor temperature sensor to be
ignored, if it fails.
The start inhibit thresholds for each sensor are shown
in TABLE 14:
190
SYSTEM SAFETIES (FAULTS)
TABLE 14 - START INHIBIT SENSOR
THRESHOLDS
High Motor Temperature Cutout Fault
The High Motor Temperature Cutout prevents a com-
pressor from running when its motor temperature is
too high. A system will fault and shut down when any
compressor motor temperature sensor rises above 250°F.
The system will be inhibited from starting if its motor
temperatures sensors indicate temperatures above 240°F.
If any single temperature sensor is being ignored under
the Unit Set-up Mode, that sensor will not be utilized
when evaluating motor temperature.
Below is a sample Status display fault message:
X indicates the system and YYYYYYY indicates the
system is in a "FAULT" condition and will restart when
the fault clears or "LOCKOUT" and will not restart until
the operator clears the fault using the keypad.
LOW
SENSOR
THRESHOLD
SUCTION 0.3VDC
TRANSDUCER
OIL 0.3VDC
TRANSDUCER
DISCHARGE 0.3VDC
TRANSDUCER
LEVEL SENSOR 3.0ma
MOTOR TEMP.
SENSOR
SYS X YYYYYYYY HIGH MOTOR TEMP
FORM 201.21-NM2 (616)
HIGH
THRESHOLD
4.7VDC
4.7VDC
4.7VDC
21.0ma
0ºF 240ºF
JOHNSON CONTROLS