Johnson Controls York YD Manual page 47

Table 9: Safety shutdown messages
Message
OIL PUMP #1 – LOW
DIFFERENTIAL PRESSURE
OIL PUMP #2 – LOW
DIFFERENTIAL PRESSURE
OIL PUMP #1 – PRESSURE
TRANSDUCER OUT OF RANGE
OIL PUMP #2 – PRESSURE
TRANSDUCER OUT OF RANGE
OIL SUMP – PRESSURE
TRANSDUCER OUT OF RANGE
OIL PUMP #1 – SETPOINT
NOT ACHIEVED
Model YD Mod D with OptiView Control Center
Description
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.
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.
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.
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.
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.
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.
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