CIAT PRO-DIALOG+, Инструкция по эксплуатации

Страница: 5 / 28

Figure 1 - Control board
3.2 - Electrical supply to boards
All boards are supplied from a common 24 V a.c. supply referred
to earth.
CAUTION: Maintain the correct polarity of the power
supply connection of the boards, to ensure that
they are not damaged.
In the event of a power supply interrupt, the unit restarts auto-
matically without the need for an external command. However,
any faults active when the supply is interrupted are saved and
may in certain cases prevent a circuit or unit from restarting.
3.3 - Light emitting diodes on boards
All boards continuously check and indicate the proper opera-
tion of their electronic circuits. A light emitting diode (LED) lights
on each board when it is operating properly.
• The red LED that flashes for a two-second period - one
second on, one second off - indicates correct operation.
A different rate indicates a board or a software failure.
• The green LED flashes continuously on all boards to
show that the board is communicating correctly over its
internal bus. If the LED is not flashing, this indicates a
LEN bus wiring problem.
• The orange LED of the master board flashes during any
communication via the proprietary protocol communica-
tion bus.
3.4 - The sensors
Pressure sensors
Two types of electronic (high and low-pressure) sensors are
used to measure the suction and discharge pressure in each
circuit.
Thermistors
The heat exchanger water sensors are installed in the entering
and leaving side. The outdoor temperature sensor is mounted
under a metal plate. An optional water system temperature sen-
sor can be used for master/slave assembly control (in the case
of leaving water control).
In heat pump units a sensor placed on an air heat exchanger
pipe ensures defrost operation.
3.5 - The controls
Water circulation pump
The controller can regulate one or two water heat exchanger
pumps and takes care of automatic change-over between pumps.
Heaters
They protect the heat exchanger (and the piping for units without
pump) against frost, if the unit has stopped and is left energised.
Boiler
This output authorises start/stop of a boiler.
Contrast control
wheel
Back to the previous
screen
On/off key
- Unit stopped
- List of available operating
modes (only in local mode)
Green LED
Unit has stopped
Unit starts up
Unit in operation
Red LED
No alarm
Warning
Circuit or complete unit error
Up/Down key
- Navigation
- Modification
Enter key
- Validation
- Selection access
3 - HARDWARE DESCRIPTION
3.1 - General
The control system consists of an NRCP2-BASE board for sin-
gle-circuit units (up to two compressors) and two NRCP2-BASE
boards (one master and one slave board) for units with three or
four compressors. The heat pump units that are equipped with
the additional electric heater stage option uses an additional PD-
AUX board.
All boards communicate via an internal LEN bus. The NRCP2-
BASE boards continuously manage the information received
from the various pressure and temperature probes. The NRCP2-
BASE master board contains the program that controls the unit.
The user interface includes an alphanumeric eight-line display,
two LEDs with five navigation keys as well as a contrast control
wheel.
EN - 3 EREBA ACCESS