Specifications

24 YORK INTERNATIONAL
MON XX:XX AM – SYSTEM CYCLING – AUTOSTART
A remote command (computer relay contact or manual
switch) connected to the Remote/Local cycling input of
the digital input board has shut down the chiller.
MON XX:XX AM – MULTI UNIT CYCLING – AUTOSTART
Lead/Lag sequence control accessory has shut down
the chiller.
MON XX:XX AM – POWER FAILURE – AUTOSTART
The chiller is shut down because there has been a power
interruption or failure. The chiller will automatically
restart when power is restored. This message will be
displayed if the Micro Board is configured for “AUTO RE-
START AFTER POWER FAILURE”. The Micro Board is
factory set for manual restart after power failure. To con-
vert it to auto restart after power failure, remove one of
the two-pin program jumpers from the cloth bag lo-
cated inside the Control Center and place it on the
terminals labeled “Auto R” (J-60) 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 “COMPRESSOR”
switch to “STOP/RESET” position and then to “START”
position. This message will be displayed if the Micro
Board is configured for “MANUAL RESTART AFTER
POWER FAILURE”. The Micro Board is factory set for
manual restart after power failure. This has been ac-
complished by removing the two-pin jumper from the
terminals fabled “Auto R” (J-60) 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 con-
tinuous seconds. This is indicative of an AC undervoltage
condition that has caused the start relay (1R) in the
MicroComputer Control Center to de-energize. This con-
dition is checked when the MicroComputer Control Cen-
ter goes into “RUN” mode (after 30 second pre-lube). This
condition can also be caused by failure of any component
that would cause a loss of the start signal from the Con-
trol Center. In essence, this check assures that the com-
pressor is running when the Control Center is displaying
SYSTEM RUN – LEAVING TEMP CONTROL
If equipped with 3.E or later EPROM. This check is not
performed when Micro Board program jumper JP-4 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
initates a start. It can be overridden 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 re-
mote 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 nor-
mal 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.
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 pressure
has decreased to 5.42 PSIA (R11); 4.40 PSIA (R123).
The chiller will be allowed to start when the pressure in-
creased to 5.43 PSIA (R11); 4.41 PSIA (R123). To restart
chiller, press the “COMPRESSOR” switch to the “STOP/
START” 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-