Airwell RWR 240 [5/16] Display
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Airwell RWR 240 [5/16] Display

Airwell RWR 240 [5/16] Display
Page 5
Control
Main features
- Microprocessor control
- User-friendly keyboard
- Proportional and integral control of the return water temperature
(RWT)
- Hysteresis control of the leaving water temperature (LWT)
- Access code to enter the Manufacturer’s Level
- Access code to enter the Assistance Level
- Alarm and LED
- Backlighted LCD
- Pump-Down logic (start-stop)
- Rotation of the compressor operation
- Night mode (or Low Noise) control
- Counting of the pump/compressors’ hours of operation
- Display of discharge pressure values
- History of stored alarms (option)
- Programming of different setpoints with 4 ranges of time/
setpoint.
The following accessories can be also connected :
- Real Time Clock Memory Card : alarm history and programming
of different setpoints with ranges of time
- Serial Communication RS485 Card; to connect the
Chiller
Control to a BMS network
- Remote Display Terminal
- Wire Remote Control
- Phase monitor kit
Control of RWC-RWR with 4 compressors
The "Chiller Control" system
The RWC-RWR machines with 4 scroll compressors are provided
with a microprocessor card which is fully programmed by default
for the control of a cooling only chiller with 2 circuits, 2 compressors
per circuit, a high-pressure transducer per circuit.
Keyboard and display terminal
General information
The figure shows the terminal with the front door open.
It is provided with a LCD 4 lines x 20 columns, keyboard and
microprocessor-controlled LED's, so as to allow the programming
of the control parameters (setpoint, differential bands, alarm
thresholds) and the main operations to be carried out by the user.
Terminal and keyboard description
The terminal makes it possible to carry out the following operations :
- The initial configuration of the machine
- The change of all the main operating parameters
- The display of the detected alarms
- The display of all the measured quantities
The terminal and the card are connected by a 6-way phone cable.
The connection of the terminal to the basic card is not essential for
the normal operation of the controller.
Access to the "display mask" of the machine status.
Esc key : allows you to move from one mask to
another.
Alarm key : used to display the alarms, to reset
them in manual. Press it one to display the mask
of the activated alarm, press it again to reset the
alarm signal.
+
Prg+Esc keys : pressing these keys at the same
time, allows you to turn the unit On/Off.
Up-down keys : allows you to set the control
parameters' values and to move from one mask to
another (not backlighted).
Enter key : used to move the cursor inside
the masks and to save the values of the set
parameters.
+
Alarm+Enter keys : press these keys at the same
time to enter the "storical alarm" after 1' come
back at status machine menu.
Display
The display is an LCD 4 lines x 20 columns. The quantities and
the information about the operation of the unit are alternated
in the form of subsequant screens, named.
x
Home
Line 0
Line 1
Line 2
Line 3

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