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JOHNSON CONTROLS
87
FORM 150.62-NM8 (1020)
2
U N I T F A U L T :
L O W A M B I E N T T E M P
The Low Ambient Temp Cutout is a safety shutdown
designed to protect the chiller from operating in a low
ambient condition. If the outdoor ambient temperature
falls below the programmable cutout, the chiller will
shut down. Restart can occur when temperature rises
2°F above the cutoff.
U N I T F A U L T :
L O W L I Q U I D T E M P
The Low Leaving Chilled Liquid Temp Cutout protects
the chiller form an evaporator freeze-up should the
chilled liquid temperature drop below the freeze point.
This situation could occur under low flow conditions
or if the micro panel setpoint values are improperly
programmed. Anytime the leaving chilled liquid
temperature (water or glycol) drops below the cutout
point, the chiller will shutdown. Restart can occur when
chilled liquid temperature rises 2°F above the cutout.
U
N I T F A U L T :
1 1 5 V A C U N D E R V O L T A G E
The Under Voltage Safety assures that the system is
not operated at voltages where malfunction of the
microprocessor could result in system damage. When the
115VAC to the micro panel drops below a certain level, a
unit fault is initiated to safely shut down the unit. Restart
is allowed after the unit is fully powered again and the
anti‑recycle timers have finished counting down.
U N I T F A U L T :
H I G H M T R C U R R
When the CURRENT FEEDBACK ONE PER UNIT
option is selected under the OPTIONS key, the unit will
shut down when the voltage exceeds the programmed
trip voltage for
five
seconds.
The trip voltage is programmed at the factory according
to compressor or unit RLA.
Restart will occur after the anti-recycle timer times
out.
Unit Warning
The following messages are not unit safeties and will
not be logged to the history buffer. They are 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 micro panel power-up, the RTC battery
is checked. If a low battery is found, all programmed
setpoints, program values, options, time, schedule, and
history buffers 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, and if necessary, reprogram programmable
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
U5 on the IPU board.
This indicates the condensing unit jumper is installed
on J11-12. This jumper must be removed to operate the
chiller
I N C O R R E C T
U N I T T Y P E
Summary of Contents for YCAL0014E Series
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