36
JOHNSON CONTROLS
FORM 150.68-ICOM1
ISSUE DATE: 10/15/2020
Unit Warning
The low battery message is not a unit safety and will not
be logged to the history buer. It is a unit warning and
will not auto-restart. Operator intervention is required
to allow a re-start of the unit.
!! LOW BATTERY !!
CHECK PROG/SETP/OPTN
The low battery warning will only occur at microprocessor
power-up, when the RTC battery is checked. If a low
battery is found, all programmed setpoints, program
values, options, time, schedule, and history buers 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 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 U5 on the microprocessor board.
DISPLAY/PRINT KEYS
The Display/Print keys allow the user to retrieve system
and unit information that is useful for:
• monitoring
• unit operation
• diagnosing potential problems
• troubleshooting
• commissioning the unit
System and unit information, unit options, setpoints, and
scheduling can also be printed out with the use of an
optional printer. Both real-time and history information
are available.
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