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YORK INTERNATIONAL66
SYSTEM ARCHITECTURE
(REFER TO FIG. 28)
The OptiView Remote Control Center (RCC) performs
the following functions:
• Displays chiller operating conditions, alarms,
shutdown messages and history data.
• Accepts operator-programmed setpoints.
• Provides chiller operating data and status to remote
devices via serial communications.
• Allows real-time data and history data to be printed
on an optional printer.
The RCC is a microprocessor based control system
that receives analog and serial data inputs and controls
serial data outputs per instructions in the operating
program. A panel mounted display and touch-sensitive
keypad permit remote operation.
In some applications, overall system temperatures
are sensed by thermistors connected to the Remote
Control Center. The output of each thermistor is a
DC voltage that is analogous to the temperature it is
sensing. Typical output voltage range of both is 0.5
to 4.5VDC. These are analog inputs to the Remote
Control Center.
Serial Data is transmitted to and received from devices
in RS-232, RS-485 and TX/RX (opto-couple) form.
All OptiView Remote Control Centers contain the
following standard components:
• Microboard
• Keypad
• Display
• Power Supply
Figure 33 is a Remote Control Center block diagram
of the standard components.
The microprocessor and all supporting logic circuits,
along with the memory devices containing the operating
program, reside on the Microboard. All remote control
decisions are made here. In some applications it receives
analog inputs from devices. The analog inputs are
connected directly to the Microboard.
A front panel-mounted Keypad allows Operator and
Service Technician user interface. Membrane keys are
used to display chiller and system parameters, enter
setpoints and perform chiller and Remote Control
Center diagnostics.
A front panel mounted liquid crystal Display allows
graphic animated display of the connected chiller units,
chiller unit subsystems and system parameters. The
chiller and working components of the chiller are
displayed, along with chiller operating pressures and
temperatures. The Keypad is used to select displays
showing increasing levels of detail of chiller working
components.
A self-contained Power Supply supplies the necessary
DC voltages for all the components within the Remote
Control Center.
Serial data interface to the YORK ISN Building
Automation System is through the J12 connector.
Service