Fig. 3 - Chiller Starting Sequence & Shutdown Sequence (Em Starter & Solid State Starter) - York MaxE YK Series Operating & Maintenance

2. To start the chiller, press the COMPRESSOR
START switch. This switch will automatically
spring return to the RUN position. (If the unit
was previously started, press the STOP/RESET
side of the COMPRESSOR switch and then
press the START side of the switch to start the
chiller.) When the start switch is energized, the
Control Center is placed in an operating mode and
any malfunction will be noted by messages on a
graphic display.
Any malfunctions which occur dur-
ing STOP/RESET are also displayed.
When the chiller is shut down, the prerotation vanes
will close automatically to prevent loading the com-
pressor on start-up.
When the chiller starts to operate, the following au-
tomatic sequences are initiated: (Refer to Fig. 3 & 4,
"Chiller Starting & Shutdown Sequence Chart".)
1. The OptiView Control Center display message
** NOT FOR ALL SHUTDOWNS. REFER TO "DISPLAY MES-
SAGES" SECTION OF THIS MANUAL.
FIG. 3 –
CHILLER STARTING SEQUENCE & SHUTDOWN SEQUENCE
(EM STARTER & SOLID STATE STARTER)
10
will read SYSTEM PRELUBE for the first 50
seconds of the starting sequence.
2. The oil pump will start to circulate oil for a 50
second pre-run to establish oil flow and adequate
lubrication to all bearings, gears, and rotating sur-
faces within the compressor.
The high and low oil pressure transducers (OP)
and the oil temperature sensor (RT3) will sense
any malfunction in the lubrication system.
3. The anti-recycle timer software function will op-
erate after the 50 seconds of pre-run time. At this
time, the timer will be initiated and will run for 30
minutes after the compressor starts. If the chiller
shuts down during this period of time, it cannot
be started until the timer completes the 30 minute
cycle.
4. The chilled liquid pump contacts will close, start-
ing the chilled liquid pump, to allow liquid flow
through the evaporator when the COMPRESSOR
start switch is energized.
5. After the first 50 seconds of operation, the com-
pressor will start.
6. For display messages and information pertaining
to the operation of the OptiView™ Control Center,
refer to Form 160.54-O1.
FORM 160.54-O2(1102)
LD04040
YORK INTERNATIONAL