Table 9: Safety shutdown messages
Message Description
OIL PUMP #1 – LOW
DIFFERENTIAL PRESSURE
The chiller (both compressors) has been shutdown because the differential oil pressure,
as sensed by compressor #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
Clear Faults button is pressed.
OIL PUMP #2 – LOW
DIFFERENTIAL PRESSURE
The chiller (both compressors) has been shutdown because the differential oil pressure,
as sensed by compressor #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
Clear Faults button is pressed.
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 shutdown as soon as the lockout is removed and will cause the
chiller to trip.
OIL PUMP #2 – PRESSURE
TRANSDUCER OUT OF RANGE
The Chiller (both compressors) has shutdown because compressor #2 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 #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 shutdown as soon as the lockout is removed and will cause the
chiller to trip.
OIL SUMP – PRESSURE
TRANSDUCER OUT OF RANGE
The chiller (both compressors) has shut down because the Sump 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.
OIL PUMP #1 – SETPOINT
NOT ACHIEVED
The chiller (both compressors) has shutdown because compressor #1 differential oil
pressure, as sensed by compressor #1 Pump transducer and the Sump transducer, failed to
meet the following requirements:
• The differential oil pressure was <35.0 psid for 5 continuous seconds during the last
10 seconds of compressor #1 prelube or during the first 15 seconds of compressor #1
run.
-OR-
• After the first 30 seconds of compressor #1 run, the differential oil pressure was < the
Setpoint/Target oil pressure with the oil pump drive speed command at 60 Hz for 5
continuous seconds.
The chiller can be started after the Operator presses the Clear Faults button.
47Model YD Mod D with OptiView Control Center
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