26 YORK INTERNATIONAL
MON XX:XX AM
–
HIGH LINE VOLTAGE
(Solid State Starter applications only)
Chiller is shut down because the voltage in any phase
of line voltage has increased above the over-voltage
threshold for 20 consecutive seconds. Refer to expla-
nation under “System Setpoints – SSS Motor Current/
Volts”, page 10. The system will automatically restart
when all phases of line voltage decrease to the maxi-
mum allowable line voltage to start the chiller.
MON 09:30 AM – LOW OIL TEMPERATURE – AUTOSTART
The chiller is running and the oil temperature (as indi-
cated by thermistor RT3) falls below 55°F (12.8°C) the
chiller will shut down and display this message. The
chiller will automatically restart when the oil tempera-
ture increases to >71°F (21.7°C) AND is greater than
the condenser saturated temperature by 20°F (11.1°C)
or 30°F (16.7°C) depending upon how long the chiller
was shut down. Refer to the message “
MON XX:XX AM LOW
OIL TEMP DIFF – AUTOSTART
”.
MON XX:XX AM – LOW OIL TEMP DIFF – AUTOSTART
Indicates the chiller is shut down for one of the follow-
ing reasons:
1. The chiller has been shut down for 30 minutes or
less and the oil temperature minus the condenser
saturation temperature is less than 30°F (16.7°C).
– or –
2. The chiller has been shut down for more than 30
minutes and the oil temperature minus the con-
denser saturation temperature is less than 40°F
(22.2°C).
– or –
3. Following a power failure, the oil temperature mi-
nus the condenser saturation temperature is less
than 40°F (22.2°C).
The chiller will restart automatically after the condition
clears if the COMPRESSOR switch is in the RUN po-
sition.
NOTE: This check is made only when the chiller is
shut down. It is not checked when the chiller is
running or in “Start Sequence Initiated”.
DAY – TIME – OIL PRESSURE XDCR ERROR
Indicates the chiller has shut down because the differ-
ence between the High Side Oil Pressure Transducer
Output and the Low Side Transducer Output was greater
than 15.0 PSID (103.4 kPa) during the “Transducer Auto-
Zeroing Sequence” that occurs 10 seconds after a
chiller start is initiated. Message is displayed immedi-
ately after the Auto-Zeroing sequence has completed.
This indicates that one of the transducer outputs is
incorrect, possibly due to an incorrect or defective trans-
ducer. To restart the chiller, press COMPRESSOR
switch to STOP/RESET position and then to START
position.
MON XX:XX AM – FAULTY DISCHARGE TEMP SENSOR
Whenever the discharge temperature falls below 30°F
(–1.1°C), or the discharge temperature sensor is dis-
connected from the Micro Board, the preceding mes-
sage will appear. To restart the system when the dis-
charge temperature rises or the sensor has been con-
nected, press the COMPRESSOR switch to the STOP/
RESET position and then to the START position.
MON XX:XX AM – PROX SENSOR SAFETY SHUTDOWN
The chiller is shut down because the “Proximity/Tem-
perature Sensor” has detected that the distance be-
tween the compressor high speed thrust collar and the
sensor probe has increased > 10 mils or decreased
> 20 mils from the “Reference Position”.
NOTE: If the reference position is < 42 mils, the mini-
mum allowed distance is 22 mils.
IMPORTANT: If the chiller has shut down displaying
this message, it cannot be restarted until a qualified
service technician performs a visual inspection of the
high speed thrust bearing and performs a special reset
procedure. This special reset procedure is detailed in
YORK Service manual, Form 160.49-M2. Failure to per-
form the visual inspection prior to restarting the chiller
could result in severe compressor damage!!!
MON XX:XX AM – HIGH SPEED DRAIN TEMP
The chiller has shut down because the “Proximity/Tem-
perature Sensor” has detected the temperature of the
high speed drain line has reached 250.0°F (121.2°C)
or greater.
IMPORTANT: If the chiller has shut down displaying
this message, it cannot be restarted until a qualified
service technician performs visual inspection of the
high speed thrust bearing and performs a special reset
procedure. This special reset procedure is detailed in
YORK Service manual, Form 160.49-M2. Failure to per-
form the visual inspection prior to restarting the chiller
could result in severe compressor damage!!!
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