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YORK INTERNATIONAL 25
FORM 160.49-O2
will be displayed if the Micro Board is configured for
AUTO-RESTART AFTER POWER FAILURE. The Mi-
cro Board is factory set for manual restart after power
failure. To convert it to auto-restart after power failure,
remove one of the two-pin program jumpers from the
cloth bag located inside the Control Center and place it
on the terminals labeled “Auto R” (J60) on the Micro
Board.
MON XX:XX AM – POWER FAILURE
The chiller is shut down because there has been a
power interruption or failure. When power is restored,
the chiller can be restarted by pressing the COMPRES-
SOR switch to STOP/RESET position and then to
START position. This message will be displayed if the
Micro Board is configured for MANUAL RESTART AF-
TER POWER FAILURE. The Micro Board is factory
set for manual restart after power failure. This has been
accomplished by removing the two-pin jumper from
the terminals labeled “Auto R” (J60) on the Micro Board.
AC UNDERVOLTAGE – AUTOSTART
The chiller is shut down because the MicroComputer
Control Center was in RUN mode, displaying
SYSTEM RUN – LEAVING TEMP CONTROL
, but the motor
current was less than 10% FLA for 25 continuous sec-
onds. This is indicative of an AC undervoltage condi-
tion that has caused the start relay (1R) in the Micro-
Computer Control Center to de-energize. This condi-
tion is checked when the MicroComputer Control Cen-
ter goes into RUN mode (after 30 second pre-lube).
This condition can be caused by failure of any compo-
nent that would cause a loss of the start signal from
the Control Center. In essence, this check assures
that the compressor is running when the Control Cen-
ter is displaying
SYSTEM RUN – LEAVING TEMP CONTROL .
This check is not performed when program jumper JP4
is removed (Steam Turbine applications).
MON XX:XX AM – INTERNAL CLOCK – AUTOSTART
The operator-programmed daily stop schedule has shut
down the chiller. The chiller will automatically restart
when the operator-programmed daily start schedule
indicates a start. It can be overriddden by pressing the
COMPRESSOR switch to the START position.
REMOTE STOP
This message will be displayed when a remote device
(typically an Energy Management System) has com-
manded the chiller to shut down. The chiller will restart
upon application of a separate start signal from the
remote device. This message will only be displayed
when Control Center is in REMOTE mode.
ANTI-RECYCLE, XX MIN LEFT
The chiller may not restart more frequently than every
30 minutes. Displayed when chiller is shut down and
there is time remaining on the anti-recycle timer. In
normal operation, chiller cannot be restarted until
ANTI-RECYCLE, 00 MIN LEFT
is displayed. However, when
servicing the chiller, it may be desirable to inhibit this
30-minute timer. If so, simply install a jumper plug in
the unmarked terminals of the Micro Board directly
under Auto-Restart jack.
This feature eliminated when program jumper JP4 is
removed (Steam Turbine applications).
WARNING: Remove this jumper after servicing.
Failure to do this voids the Warranty.
MON XX:XX AM – LOW EVAP PRESSURE
The chiller is shut down because the evaporator pres-
sure has decreased to 54.3 PSIG (R-22); 25.0 PSIG
(R-134a). The chiller will be allowed to start when the
pressure increases to 54.4 PSIG (R-22); 25.1 PSIG
(R-134a). To restart chiller, press the COMPRESSOR
switch to the STOP/RESET position and then to the
START position.
MON XX:XX AM – LOW EVAP PRESSURE – BRINE
The chiller is shut down because the brine Low Evapo-
rator Pressure (LEP, not included with standard Con-
trol Center) safety contacts have opened. The brine
LEP safety is located external to the Control Center.
Safety cut-out settings will vary with the brine applica-
tion. To restart the chiller, wait until the safety contacts
close, press the COMPRESSOR switch to the STOP/
RESET position and then to the START position.
MON XX:XX AM – LOW OIL PRESSURE
The chiller is shut down because the oil pressure has
decreased to 15 PSID while running, or never achieved
25 PSID prior to compressor start during the oil pump
pre-lube run. The chiller will be allowed to restart when
the pressure increases to 25 PSID. Differential pres-
sure is sensed by two pressure transducers. To re-
start chiller, press COMPRESSOR switch to STOP/
RESET position and then to the START position.
MON XX:XX AM – HIGH PRESSURE
The chiller is shut down because condenser pressure