Specifications

30 YORK INTERNATIONAL
3. The 1R-1 contacts of the 1R start relay will remain
open for the first 30 seconds of oil pump operation.
These contacts will close, starting the compressor
motor and the condenser water pump at the end of
the 30 second period.
4. The oil pump will start to circulate oil for a 30 sec-
ond pre-run to establish oil flow and adequate lubri-
cation to all bearings, gears, and rotating surfaces
within the compressor.
The high and low oil pressure transducers (OP) and
the oil temperature sensor (RT3) will sense any mal-
function in the lubrication system and activate one
of the following display messages:
DAY 10:30 AM – LOW OIL PRESSURE
DAY 10:30 AM – HIGH OIL PRESSURE
DAY 10:30 AM – LOW OIL TEMP – AUTOSTART
DAY 11:30 AM – OIL PRESSURE TRANSDUCER
5. The anti-recycle timer software function will operate
after the 30 seconds of pre-run time. At this time the
timer will be initiated and will run for 30 minutes af-
ter 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.
6. The chilled liquid pump contacts will close, starting
the chilled liquid pump to allow liquid flow through
the cooler when the “COMPRESSOR” start switch is
energized.
7. After the first 30 seconds of operation, the compres-
sor will start and the Control Center display mes-
sage will read
SYSTEM RUN – CURRENT LIMIT IN EFFECT
while the motor is accelerating to full speed. When
the motor reaches full speed and the current falls
below 100% FLA the message will read
SYSTEM RUN – LEAVING TEMP. CONTROL
Chiller OPERATION
After the compressor reaches its operating speed the
prerotation vanes will begin to open under the control of
the micro processor board or the logic section of the
Variable Speed Drive which senses the leaving chilled
liquid temperature. The unit capacity will vary to main-
FIG. 18 - CHILLER STARTING SEQUENCE & SHUTDOWN SEQUENCE
LD00465