OMM 1008-1
15
3.
Press the ACKNOWLEDGE button to recognize the alarm.
4.
Correct the condition causing the alarm.
5.
Press the CLEAR button to clear the alarm from the controller. If the fault condition is not fixed, the
alarm will continue to be on and the unit will not be able to be restarted.
Component Failure
Chiller Operation without the Operator Interface Panel
The Operator Interface Touch Screen communicates with the unit controller, displaying data and transmitting
touch screen inputs to the controllers. It does no actual controlling and the chiller can operate without it.
Should the Touch Screen become inoperable, no commands are necessary for continuing unit operation. All
normal inputs and outputs will remain functional. The unit controller can be used to view operational data, to
clear alarms and to change setpoints, if necessary.
Component Description
Operator Interface Touch Screen
The operator interface touch screen (OITS) is the primary
device for entering commands and entries into the control
system. (Settings can also be made directly into the unit
controller.) The OITS can also display controller data and
information on a series of graphic screens. A single OITS is
used per unit.
Selected information from the OITS panel can be down-
loaded via a USB port located in the unit control panel.
The OITS panel is mounted on a moveable arm to allow
placement in a convenient position for the operator.
There is a screen-saver programed into the system. The
screen is reactivated by touching it anywhere.
Controller Description
Hardware Structure
The controller is fitted with a microprocessor for running the control program. There are terminals for
connection to the controlled devices (for example: solenoid valves, tower fans, pumps). The program and
settings are saved permanently in FLASH memory, preventing data loss in the event of power failure without
requiring a back-up battery.
The controller connects to other control boards, the on-board compressor microprocessors and the OITS via a
local communications network. The controller can also have an optional module to provide communication
for a BAS using standard open protocols.
