JOHNSON CONTROLS
129
SECTION 2 – OPTIVIEW CONTROL CENTER
FORM 160.79-O3
ISSUE DATE: 11/09/2018
2
While the Vanes are closing during a soft shutdown, if
a Local stop or any faults listed above occur, the soft
shutdown is terminated and the chiller immediately
enters “Coastdown”.
Run Messages
“LEAVING CHILLED LIQUID CONTROL”
The chiller is running, controlling the Leaving Chilled
Liquid to the Leaving Chilled Liquid Temperature Set-
point. There are no system conditions inhibiting this
operation.
"SYSTEM IN LEAD COMPRESSOR PULL-
DOWN"
Displayed while a LEAD COMPRESSOR PULL-
DOWN TIME Setpoint (0-255 minutes) is in effect.
The time remaining in the period is also displayed. For
the duration of this period, only the Lead compressor
will be permitted to run. The Lag compressor will not be
brought on line during this period. A current limit may
be applied to the Lead motor during this period using
the LEAD COMPRESSOR PULLDOWN DEMAND
LIMIT setpoint (30-100%). See the complete expla-
nation in
SECTION 1 – DESCRIPTION OF SYSTEM
“LEAD MOTOR-HIGH CURRENT LIMIT”
Either the Lead Compressor Pulldown Demand Time
Setpoint is in effect and the lead compressor motor
current is being limited by the Lead Compressor Pull-
down Demand Limit Setpoint, or the Lead Compres-
sor Pulldown Demand Time Setpoint has elapsed and
the lead compressor motor current is being limited by
the Chiller Current Limit Setpoint.
Refer to the MOTOR screen for details of the condi-
tions above.
When the motor current increases to the “inhibit open”
threshold, the Pre-rotation Vanes are inhibited from
further opening. This prevents a further current rise. If
the current continues to rise to the “start close” thresh-
old, the Vanes begin closing until the current falls to
the “stop close” threshold. Automatic Vane opera-
tion is resumed and this message automatically clears
when the motor current decreases to the “allow open”
threshold.
“LAG COMPRESSOR PRELUBE”
A start has been initiated on the lag compressor and
the 50 second pre-start lubrication is being performed.
“LAG COMPRESSOR COASTDOWN”
The lag compressor has shutdown and the 150 sec-
ond post-run lubrication is being Performed on the lag
compressor.
“LAG COMPRESSOR UNLOADING BEFORE
SHUTDOWN”
Displayed while the Pre-rotation Vanes and Discharge
Valves are closing during a soft shutdown of the lag
compressor.
“VANES #1 START INHIBIT-MOTOR SWITCH
OPEN”
Compressor #1 is inhibited from starting because its
Pre-rotation Vanes are not fully closed (Vane Motor
Switch open), but compressor #2 is able to run and
thus the chiller is not prevented from operating. This
message clears when the Vanes have fully closed.
“VANES #2 START INHIBIT-MOTOR SWITCH
OPEN”
Compressor #2 is inhibited from starting because its
Pre-rotation Vanes are not fully closed (Vane Motor
Switch open), but compressor #1 is able to run and
thus the chiller is not prevented from operating. This
message clears when the Vanes have fully closed.
“MOTOR #1 START INHIBIT – ANTI-RECY-
CLE”
Compressor #1 is inhibited from starting because its
30 minute anti-recycle period is in Effect, but com-
pressor #2 is able to run. This message clears when the
30 minute timer expires.
“MOTOR #2 START INHIBIT – ANTI-RECY-
CLE”
Compressor #2 is inhibited from starting because its
30 minute anti-recycle period is in Effect, but com-
pressor #1 is able to run. This message clears when the
30 minute timer expires.
START INHIBIT MESSAGES
“DISCHARGE VALVE #1 - OPEN”
The chiller (both compressors) is inhibited from start-
ing because compressor #1 Discharge Valve is not
closed. This start inhibit is released when the valve has
fully closed.