JOHNSON CONTROLS
140
FORM 160.79-O3
ISSUE DATE: 11/09/2018
SECTION 2 – OPTIVIEW CONTROL CENTER
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.
“DISCHARGE #2 – LOW TEMPERATURE”
The chiller (both compressors) has shutdown because
the discharge temperature of compressor #2, as sensed
by thermistor RT8, has decreased to <30.0 ºF. The
chiller can be started after the temperature increases
to >30.0ºF 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 shut-
down as soon as the lockout is removed and will cause
the chiller to trip.
“DISCHARGE #1 – VALVE NOT OPENED”
The chiller (both compressors) has shutdown be-
cause compressor #1 Discharge Valve did not fully
open (as indicated by the closure of the valve opened
end switch) within 40 seconds of receiving the open
command. The chiller can be started after the valve
“opened” end switch closes for 3 seconds, compressor
#1 is stopped, and the Operator presses the Clear Faults
button. This prevents the possibility of initiating a fault
due to switch bounce.
“DISCHARGE #2 – VALVE NOT OPENED”
The chiller (both compressors) has shutdown be-
cause compressor #2 Discharge Valve did not fully
open (as indicated by the closure of the valve opened
end switch) within 40 seconds of receiving the open
command. The chiller can be started after the valve
“opened” end switch closes for 3 seconds, compressor
#2 is stopped, and the Operator presses the Clear Faults
button. This prevents the possibility of initiating a fault
due to switch bounce.
“AUXILIARY SAFETY – CONTACTS CLOSED”
The chiller (both compressors) has shutdown because
locally installed external safety shutdown contacts
connected to I/O Board TB4-31 have closed, initiat-
ing a safety shutdown. The chiller can be started after
the contacts have opened and the Operator presses the
Clear Faults button.
“OIL – HIGH TEMPERATURE”
The chiller (both compressors) has shutdown because
the oil temperature, as sensed by thermistor RT3, has
increased to >180.0 ºF. The chiller can be started after
the temperature decreases to <180.0 ºF. The chiller can
be started after the contacts have opened and the Op-
erator presses the Clear Faults button.
“OIL PUMP #1 – DIFFERENTIAL PRESSURE
CALIBRATION”
The chiller (both compressors) has shutdown because
the Sump oil pressure transducer and compressor #1
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 safety
only applies when compressor #1 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 #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 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.
