Specifications

52
JOHNSON CONTROLS
Form 201.28-NM1.EN.PED/CE (0211)
OPERATION
UNIT WARNING
Unit Warning Operation
Unit warnings are caused when a condition is present
requiring operator intervention to restart the unit. All
setpoints, program values, and options should be checked
before operating the unit. Warnings are not logged to the
history buffer. If a unit warning is in effect, the message
will be displayed to the operator when the STATUS key
is pressed.
Low Battery Warning
The LOW BATTERY WARNING can only occur at unit
power-up. On micropanel power-up, the RTC battery is
checked to see if it is still operational. If it is, normal unit
operation is allowed. If the battery voltage is determined
to be low, the following warning message is displayed
indefinitely.
UNIT WARNING: !! LOW BATTERY !!
CHECK SETPOINTS/PROGRAM/OPTIONS/TIME
If a low battery condition exists, all programmed
setpoints, program values, time, schedule, and history
buffers will have been lost. These values will all be reset
to their default values, which may not be the desired
operating values. Once a bad battery is detected, the
unit will be prevented from running until the MANUAL
OVERRIDE key is pressed. Once the MANUAL
OVERRIDE key is pressed, the anti recycle timers will
be set to the programmed default anti recycle time to
allow the operator sufficient time to check setpoints,
program values, etc.
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.
Invalid Number of Compressors Warning
The INVALID NUMBER OF COMPRESSORS
SELECTED Warning will occur after the VSD has
been initialized, if no ”Number of Compressors Select”
jumpers are installed or if more than 1 jumper is installed.
The following warning message will be displayed
indefinitely.
UNIT WARNING:
INVALID NUMBER OF COMPRESSORS SELECTED
To clear this warning, both the control panel and VSD
control voltage must be turned OFF and the jumpers
properly installed in the VSD wiring harness.
These jumpers are factory installed in the
wire harness plug and should not require
changes.
Invalid Serial Number Warning
If the INVALID SERIAL NUMBER message appears,
immediately contact Johnson Controls Product Technical
Support. The appearance of this message may mean
the chiller has lost important factory programmed
information. The serial number can be entered using the
SERVICE key.
UNIT WARNING: INVALID SERIAL NUMBER
ENTER UNIT SERIAL NUMBER
This status message can be bypassed to view additional
messages under the STATUS key by pressing the
STATUS key repeatedly to scroll through as many as
three STATUS messages that could possibly be displayed
at any time.