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YORK INTERNATIONAL
MON XX:XX AM PROGRAM INITIATED RESET
The chiller is shut down because Micro Board did not
receive a hardware-generated interrupt on schedule.
Typical is an Analog/Digital Converter interrupt. This
message is indicative of a Micro Board hardware fail-
ure or electrical noise on Micro Board. The chiller will
automatically restart. This message indicates that the
watchdog timer-circuit has reset the microprocessor.
This occurs when the time needed to step through pro-
gram is longer than allowable, thus the software pro-
gram is initialized at its 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 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
WARN-
ING 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 (JP6) wire
jumper on the Micro Board as follows:
FUNCTION
JUMPER POSITION
50 Sec. Oil Pump Prerun
Installed
180 Sec. Oil Pump Prerun
Cut
SYSTEM COASTDOWN
Displayed while motor is decelerating after a chiller
shutdown. The oil pump is running during this period.
The duration of this period is 150 seconds.
If unit is configured for a Steam Turbine application
(program jumper JP4 removed), this period is extended
to allow for a longer coastdown time. EPROM version
C.02F(T).11 provides a 6 minute coastdown period.
EPROM version C.02F(T).12 or later provides a 10
minute coastdown period.
MON XX:XX AM MTR PHASE CURRENT UNBALANCE
(Solid State Starter applications only)
The chiller is shut down because the compressor-mo-
tor current was unbalanced while the chiller was run-
ning. The current balance is only checked after the
motor has been running for a minimum of 45 seconds
and the motor current is 80% FLA or greater. If the cur-
rent 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:
I
∅
A
= 200A
I
∅
B
= 200A
I
∅
c
= 118A
THEN:
I
AV
= 200 + 200 + 118
3
I
AV
= 173A
I
ACCEPTABLE
= 173 ± 30% = 121A or 225A
THEREFORE:
Since I
∅
C
= 118A which is less than the acceptable
121A, the chiller would shut down if this unbalance
exists for 45 consecutive seconds.
MON XX:XX AM LOW LINE VOLTAGE
(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 11. The system will
automatically restart when all phases of line voltage
increase to the minimum required starting voltage.
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 11. 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 (12.7°C), the
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