40
YORK INTERNATIONAL
SYSTEM SHUTDOWN MESSAGES
For YG chillers there are two types of shutdowns, quick
and standard.
QUICK SHUTDOWN:
is performed when the possibil-
ity of damage due to continued running exists. YORK
supplies a contact closure which tells the CAT panel it
is an emergency and cuts the fuel and ignition. The
YORK Panel de-clutches. The following message is
displayed.
COMP. COASTDN; ENG SHTDN-PRESS STATUS
This shutdown occurs very quickly to avoid potential equip-
ment damage.
NOTE: On a quick shutdown the engine panel must
be manually reset. This is due to the emer-
gency stop on the engine.
STANDARD SHUTDOWN:
is performed in all other
situations. The following message is displayed after
clutch disengagement.
COMPR. COASTDN; ENG COOLDN-PRESS STATUS
Quick safety shutdowns are initiated by the YORK Micro
Panel or Engine Control Panel (ECP) and will require re-
setting the ECP as well as the YORK Micro Panel.
A quick safety shutdown initiated by the Micro Panel will
be indicated by a flashing ESTOP LED on the status
control module of the engine panel, as well as an appro-
priate message on the Micro Panel display. Follow the
procedure detailed in the Engine Control Panel section
to reset the system.
COMPR SHUTDOWN – ENGINE COOLDOWN
This is displayed after the 150 sec. compressor coast-
down period has been completed. This message is dis-
played for 1.5 minutes while the engine completes the
cooldown period. At the completion of the cooldown pe-
riod, the engine shuts down.
Day of Week Time of Day Cause of Shutdown Type of Restart
MON 10:00 AM – LOW WATER TEMP – AUTOSTART
Chiller had a
standard shutdown
on Monday at 10:00
AM because the LCWT has decreased to a value that is
4°F below the operator-programmed chilled liquid tem-
perature setpoint. However, if the setpoint is less than
40°F, the chiller will always shutdown at 36°F. Further, if
the chiller is running and the setpoint is changed, the
(Low Water Temperature) cutout will be 36°F for 10 min-
utes in order to eliminate nuisance trips. Finally, for brine
chilling applications, the LWT cutout is always 4°F below
the setpoint (The water jumper on the Micro Board must
be removed for a brine unit).
MON XX:XX AM – FLOW SWITCH
Chiller had a
quick shutdown
because a chilled-liquid
flow switch has opened. The flow switch must open for a
minimum of 2 seconds in order to cause a shutdown.
The flow switch is checked 25 seconds into Start Se-
quence Initiated and continuously thereafter.
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 initiated a
standard shutdown
of
the chiller.
MON XX:XX AM – MULTI UNIT CYCLING – AUTOSTART
Lead/Lag sequence control accessory initiated a
stand-
ard shutdown
of the chiller. This can be checked on the
digital input PCB at
1
and
9
.
MON XX:XX AM – POWER FAILURE
Chiller had a
quick shutdown
because of AC power fail-
ure. Follow the procedure detailed in Engine Control Panel
section to reset system (page 14).
MON XX:XX AM – INTERNAL CLOCK – AUTOSTART
The operator-programmed daily stop schedule initiated a
standard shutdown
of the chiller. The chiller will auto-
matically restart when the operator-programmed daily
start schedule initiates 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 perform a
standard shutdown
.
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.
MON XX:XX AM – LOW EVAP PRESSURE
The chiller had a
quick shutdown
because the evapora-
tor pressure has decreased to 25.0 PSIG. Safety shut-
down reset procedure required (page 14).
MON XX:XX AM – LOW EVAP PRESSURE – BRINE
The chiller had a
quick shutdown
because the brine Low
Evaporator Pressure, LEP (not included with standard
Control Center) safety contacts have opened. The brine
LEP safety is located external to the Control Center. Safety
cutout settings will vary with the brine application. Safety
shutdown reset procedure is required (page 14).
MON XX:XX AM – LOW OIL PRESSURE
The chiller had a
quick shutdown
because the oil pres-
sure has decreased to 15 PSID while running, or never
achieved 25 PSID prior to compressor start during the oil
pump pre-lube run. Differential pressure is sensed by two
