York 371-01200-010, Operating & Maintenance, Page: 29 / 60

FORM 160.52-O1
29
YORK INTERNATIONAL
chiller will shut down and display this message. The
chiller will automatically restart when the oil tempera-
ture increases to >71°F (21.6°C) AND is greater than
the condenser saturated temperature by 20°F (11°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 20°F (11°C).
– or –
2. The chiller has been shut down for more than 30
minutes and the oil temperature minus the condenser
saturation temperature is less than 30°F (16.7°C).
– or –
3. Following a power failure, the oil temperature minus
the condenser saturation temperature is less than
30°F (16.7°C).
The chiller will restart automatically after the condition
clears if the COMPRESSOR switch is in the RUN posi-
tion.
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 kPa) during the “Transducer Auto-
Zeroing Sequence” that occurs 10 seconds after a chiller
start is initiated. Message is displayed immediately after
the Auto-Zeroing sequence has completed. This indi-
cates that one of the transduce outputs is incorrect, pos-
sibly due to an incorrect or defective transducer. To re-
start 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°C), or the discharge temperature sensor is discon-
nected from the Micro Board, the preceding message
will appear. To restart the system when the discharge
temperature rises or the sensor has been connected,
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 (25 mils with EPROM version C.02F(T).12 or
later) from the “Reference Position”.
NOTE: With EPROM version C.02F (T).11, if the refer-
ence position is < 42 mils, the minimum allowed
distance is 22 mils. With EPROM version
C.02F(T).12 or later, if the reference position
is < 44 mils, the minimum allowed distance is
19 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
perform the visual inspection prior to restarting the
chiller could result in severe compressor damage!!!
DAY – TIME – FAULTY PROXIMITY PROBE
The chiller has 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 decreased to < 17 mils.
IMPORTANT!!!: Although this message is generally
indicative of a defective proximity probe, it is possible
that the compressor has been damaged. If the high
speed thrust bearing is not inspected by a qualified
service technician prior to starting the chiller, further
severe compressor damage could result. The chiller
cannot be restarted until the “Special Reset Procedure”
in YORK Service manual, Form 160.49-M2 is per-
formed by a qualified service technician.
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°F (121°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 pro-
cedure. This special reset procedure is detailed in
YORK Service manual, Form 160.49-M2. Failure to
perform the visual inspection prior to restarting the
chiller could result in severe compressor damage!!!