Start Inhibit Messages - York YD Series Operation Manual

FORM 160.69-O1
ISSUE DATE: 9/30/2012
"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.
JOHNSON CONTROLS
SECTION 2 – OPTIVIEW CONTROL CENTER
"DISCHARGE VALVE #2 - OPEN"
The chiller (both compressors) is inhibited from start-
ing because compressor #2 Discharge Valve is not
closed. This start inhibit is released when the valve has
fully closed.
"MOTOR #1 – ANTI-RECYCLE"
The chiller (both compressors) is inhibited from start-
ing because compressor #1 motor is in the 30 minute
anti-recycle period and compressor #2 is unable to run.
This start inhibit is released when the 30 minute timer
expires.
"MOTOR #2 – ANTI-RECYCLE"
The chiller (both compressors) is inhibited from start-
ing because compressor #2 motor is in the 30 minute
anti-recycle period and compressor #1 is unable to run.
This start inhibit is released when the 30 minute timer
expires.
"MOTOR #1 – CURRENT >15% FLA"
The chiller (both compressors) is inhibited from start-
ing because a motor current of >15% FLA was de-
tected on compressor #1 while it was not running.
This inhibit is set instantly with no delay and the oil
pump is started as soon as the motor current is de-
tected. The starting frequency for the Variable Speed
Drive Oil Pump is 45Hz. This inhibit is released when
the compressor#1 motor current decreases to < 15%
FLA and the COMPRESSOR Switch is placed in the
Stop-reset (O) position. A complete 150 second Coast-
down is performed when after the inhibit is released.
In Software version C.MLM.11.01.xxx (and earlier) or
C.OPT.11.02.300 (and earlier), the motor current must
be present for at least 10 seconds before the inhibit is
set.
"MOTOR #2 – CURRENT >15% FLA"
The chiller (both compressors) is inhibited from start-
ing because a motor current of >15% FLA was de-
tected on compressor #2 while it was not running.
This inhibit is set instantly with no delay and the oil
pump is started as soon as the motor current is de-
tected. The starting frequency for the Variable Speed
Drive Oil Pump is 45Hz. This inhibit is released when
the compressor#1 motor current decreases to < 15%
FLA and the COMPRESSOR Switch is placed in the
Stop-reset (O) position. A complete 150 second Coast-
2
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