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JOHNSON CONTROLS
141
SECTION 2 – OPTIVIEW CONTROL CENTER
FORM 160.79-O3
ISSUE DATE: 11/09/2018
2
“OIL PUMP #2 – DIFFERENTIAL PRESSURE
CALIBRATION”
The chiller (both compressors) has shutdown because
the Sump oil pressure transducer and compressor #2
Pump oil pressure transducer indicated a differential
pressure of >15.0 PSID during the oil pressure trans-
ducer auto-zeroing period that begins 10 seconds into
“System Prelube” and lasts for 3 seconds. This fault
only applies when compressor #2 is the lead compres-
sor. This is indicative of a defective Sump or Pump
transducer, since the transducers are sensing the same
pressures during this period. The chiller can be started
after the Operator presses the Clear Faults button.
If compressor #2 is locked out using the Lockout key
on the Capacity Compressor Cycling Screen, this fault
does not cause compressor #1 to shutdown or prevent
it from starting. When this fault occurs on a locked-out
compressor, it is displayed as a warning. This allows
the user to know that a fault exists on the locked-out
compressor. The condition must be corrected prior to
the lockout being removed from the compressor. If it
is not, the warning condition will revert back to a shut-
down as soon as the lockout is removed and will cause
the chiller to trip.
“OIL PUMP #1 – HIGH DIFFERENTIAL PRES-
SURE”
The chiller (both compressors) has shutdown because
the oil pressure differential, as sensed by compressor
#1 Pump transducer and the Sump transducer, has in-
creased to >90.0 PSID. This fault is only checked if
both the compressor #1 Pump transducer and the Sump
transducer are in range. The chiller can be started after
the differential is <90.0 PSID and the Operator presses
the Clear Faults button.
“OIL PUMP #2 – HIGH DIFFERENTIAL PRES-
SURE”
The chiller (both compressors) has shutdown because
the oil pressure differential, as sensed by compressor
#2 Pump transducer and the Sump transducer, has in-
creased to >90.0 PSID. This fault is only checked if
both the compressor #2 Pump transducer and the Sump
transducer are in range. The chiller can be started after
the differential is <90.0 PSID and the Operator presses
the Clear Faults button.
“OIL PUMP #1 – LOW DIFFERENTIAL
PRESSURE”
The chiller (both compressors) has been shutdown be-
cause the differential oil pressure, as sensed by com-
pressor #1 Pump transducer and the Sump transducer,
decreased to <15.0 PSID while compressor #1 was
running or went below 25.0 PSID during the last 5
seconds of compressor #1 Prelube. This fault is only
checked if both the compressor #1 Pump transducer
and the Sump transducer are in range. The chiller can
be started after the Operator presses the Clear Faults
button.
“OIL PUMP #2 – LOW DIFFERENTIAL
PRESSURE”
The chiller (both compressors) has been shutdown be-
cause the differential oil pressure, as sensed by com-
pressor #2 Pump transducer and the Sump transducer,
decreased to <15.0 PSID while compressor #1 was
running or went below 25.0 PSID during the last 5
seconds of compressor #1 Prelube. This fault is only
checked if both the compressor #2 Pump transducer
and the Sump transducer are in range. The chiller can
be started after the Operator presses the Clear Faults
button.
“OIL PUMP #1 – PRESSURE TRANSDUCER
OUT OF RANGE”
The Chiller (both compressors) has shutdown because
compressor #1 Pump oil pressure transducer is out of
range (< 0.0 PSIG or >300.0 PSIG). The chiller can
be started after the pressure is within range and the
Operator presses the Clear Faults button.
If compressor #1 is locked-out using the Lockout key
on the Capacity Compressor Cycling Screen, this fault
does not cause compressor #2 to shutdown or prevent
it from starting. When this fault occurs on a locked-out
compressor, it is displayed as a warning. This allows
the user to know that a fault exists on the locked-out
compressor. The condition must be corrected prior to
the lockout being removed from the compressor. If it
is not, the warning condition will revert back to a shut-
down as soon as the lockout is removed and will cause
the chiller to trip.