Specifications

26 YORK INTERNATIONAL
FLA for 10 seconds minimum anytime when the com-
pressor-start signal is not energized. To restart the chiller,
press “COMPRESSOR” switch to “STOP/RESET” a po-
sition and then to the “START” position.
MON XX:XX AM – PROGRAM INITIATED RESET
The chiller is shut down because the Micro Board did
not receive a hardware-generated interrupt on sched-
ule. Typical is an Analog/Digital Converter interrupt. This
message is indicative of a Micro Board hardware failure
or electrical noise on Micro Board. The chiller will auto-
matically restart. This message indicates that the watch-
dog timer-circuit has reset the microprocessor. This oc-
curs when the time needed to step through program is
longer than allowable, thus the software program is ini-
tialized at the beginning.
SYSTEM READY TO START – PRESS STATUS
The chiller was shut down on a safety shutdown and
will start upon application of a local or remote start sig-
nal. Since the message states that the chiller is “Ready
to Start”, it means that the condition that caused the
shutdown no longer exists and the Control Center has
been manually reset. When the “STATUS” key is pressed,
a message is displayed that describes the reason for
shutdown. The message will be displayed for 2 seconds
and then return to
SYSTEM READY TO START – PRESS STATUS
Those messages that could be displayed are any of
the previously described safety-shutdown messages
or warning messages. They can be cleared from the
display by entering “Service” mode and pressing
“WARNING RESET” key. Or, the message will be
cleared by initiating a compressor start.
START SEQUENCE INITIATED
Indicates that the Micro Board has received a local or
remote start signal and has initiated the chiller start-up
routine. This is the compressor pre-lube period. The
duration of this period is controlled by the “Prerun” (JP-6)
wire jumper on the Micro Board as follows:
FUNCTION Jumper Position
30 SEC. OIL PUMP RERUN INSTALLED
*180 SEC. OIL PUMP RETURN CUT
* Only used on YDTK 131-144 “F” compressors.
SYSTEM COASTDOWN
Displayed while motor is decelerating atter a chiller
shut down. The oil pump is running during this period.
The duration of this period is controlled by the “CSTDN”
(JP-4) wire jumper on the Micro Board as follows:
FUNCTION Jumper Position
150 SEC. COASTDOWN INSTALLED
*6 MIN. COASTDOWN CUT
* Use on steam turbine applications only.
MON XX:XX AM – MTR PHASE CURRENT UNBALANCE
(Solid State Starter Applications Only)
The chiller is shut down because the compressor-
motor current was unbalanced while the chiller was
running. The current balance is only checked atter the
motor has been running for a minimum of 45 seconds
and the motor current is 80% FLA or greater. If the
current in any phase deviates from the average (
a+b+c
)
current by greater than 30% for a minimum of 45 con-
secutive seconds, a shutdown is initiated. To restart the
system, press the “COMPRESSOR” switch to “STOP/
RESET” position and then to the “START” position. An
example of the conditions for shutdown is as follows:
If
IøA = 200A
IøB = 200A
IøC = 118A
Then
IAV =
200 + 200 + 118
IAV = 173A
IACCEPTABLE = 173 ± 30% = 121A or 225A
Therefore
Since IøC = 118A which is less than the accept-
able 121A, the chiller would shut down if this un-
balance exists tor 45 consecutive seconds.
MON XX:XX AM – LOW LINE VO LTAG E
(Solid State Starter Applications Only)
Chiller is shut down because the voltage in any phase
of line voltage has decreased below the under-voltage-
shutdown threshold for 20 consecutive seconds, or failed
to achieve the minimum required starting line-voltage.
Refer to explanation under “System Setpoints - SSS
Motor Current/Volts”, page 8. The system will auto-
matically restart when all phases of line voltage in-
crease to the minimum required starting voltage.
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