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UNIT SAFETIES
Unit safeties are faults that cause all running compres-
sors to be shut down. Unit faults are auto reset faults in
that the unit will be allowed to restart automatically after
the fault condition is no longer present.
U N I T
L O W
A M B I E N T
The Low Ambient Temp Cutout is a safety shutdown de-
signed to protect the unit from operating in a low ambi-
ent condition. If the outdoor ambient temperature falls
below the programmable cutout, the chiller will shut
down. Restart can occur when temperature rises 2° above
the cutoff.
U N I T
1 1 5 V A C
U N D E R
The Under Voltage Safety assures that the system is
not operated at voltages where malfunction of the micro-
processor could result in system damage. When the
115VAC to the micropanel drops below a certain level, a
unit fault is initiated to safely shut down the unit. Re-
start is allowed after the unit is fully powered again and
the anti-recycle timers have finished counting down.
YORK INTERNATIONAL
F A U L T :
T E M P
F A U L T :
V O L T A G E
UNIT WARNING
The following message is not a unit safety and will not
be logged to the history buffer. It is a unit warning and
will not auto-restart. Operator intervention is required to
allow a restart of the chiller.
! !
L O W
B A T T E R Y
C H E C K
P R O G / S E T P / O P T N
The Low Battery Warning can only occur at unit power-
up. On micropanel power-up, the RTC battery is checked.
If a low battery is found, all programmed setpoints, pro-
gram values, options, time, schedule, and history buff-
ers will be lost. These values will all be reset to their
default values which may not be the desired operating
values. Once a faulty battery is detected, the unit will be
prevented from running until the PROGRAM key is
pressed. Once PROGRAM is pressed the anti-recycle
timers will be set to the programmed anti-recycle time
to allow the operator time to check setpoints, program
values, and options.
If a low battery is detected, it should be replaced as
soon as possible. The programmed values will all be
lost and the unit will be prevented from running on the
next power interruption. The RTC/battery is located at
U17 on the microboard.
FORM 150.63-NM2
! !
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