81
2 - GENERAL DESCRIPTION
2.1 - GENERAL
Pro-Dialog is a system for controlling single-, dual- or
triple circuit 30RB air-cooled liquid chillers or 30RQ air-
to-water heat pumps. Pro-Dialog controls compressor
start-up needed to maintain the desired heat exchanger
entering or leaving water temperature. In cooling mode
it controls the operation of the fans to maintain the correct
condensing pressure in each circuit. For heat pump units
it controls and optimises the defrost cycles of each circuit
in order to minimize the heating capacity reduction.
Safety devices are constantly monitored by Pro-Dialog
to ensure their safe operation. Pro-Dialog also gives
access to a Quick Test program covering all inputs and
outputs.
All PRO-DIALOG Plus controls can work in accordance
with three independent modes:
✓
Local mode: the machine is controlled by
commands from the user interface.
✓
Remote mode: the machine is controlled by remote
contacts (volt-free contacts).
✓
CCN mode: the machine is controlled by commands
from the Carrier Comfort Network (CCN). In this case,
a data communication cable is used to connect the
unit to the CCN communication bus.
The operating mode must be chosen with the Start/Stop
button described in section 4.2.1. When the PRO-DIALOG
Plus system operates autonomously (Local or Remote
mode) it retains all of its own control capabilities but
does not offer any of the features of the CCN network.
1 - SAFETY CONSIDERATIONS
1.1 - GENERAL
Installation, start-up and servicing of equipment can be
hazardous if certain factors particular to the installation
are not considered: operating pressures, presence of
electrical components and voltages and the installation
site (elevated plinths and built-up up structures). Only
properly qualified installation engineers and highly
qualified installers and technicians, fully trained for the
product, are authorised to install and start-up the
equipment safely. During all servicing operations all
instructions and recommendations which appear in the
installation and service instructions for the product, as
well as on tags and labels fixed to the equipment and
components and accompanying parts supplied
separately, must be read, understood and followed.
✓
Apply all standard safety codes and practices.
✓
Wear safety glasses and gloves.
✓
Use the proper tools to move heavy objects. Move
units carefully and set them down gently.
1.2 - AVOID ELECTROCUTION
Only personnel qualified in accordance with IEC
(International Electrotechnical Commission)
recommendations may be permitted access to electrical
components. It is particularly recommended that all
sources of electricity to the unit be shut off before any
work is begun. Shut off the main power supply at the
main circuit breaker or isolator.
IMPORTANT:
This equipment uses and emits
electromagnetic signals. Tests have shown that the
equipment conforms to all applicable codes with respect
to electromagnetic compatibility.
RISK OF ELECTROCUTION:
Even when the main circuit
breaker or isolator is switched off, certain circuits may still
be energised, since they may be connected to a separate
power source.
RISK OF BURNS:
Electrical currents cause components
to get hot either temporarily or permanently. Handle power
cable, electrical cables and conduits, terminal box covers
and motor frames with great care.
Fan start-up:
ATTENTION:
In accordance with the operating conditions
the fans can be cleaned periodically. A fan can start at
any time, even if the unit has been shut down.
2.2 - ABBREVIATIONS USED
In this manual, the refrigeration circuits are called circuit
A, circuit B and circuit C. The compressors in circuit A
are labelled A1, A2, A3 and A4. Those in circuit B are B1,
B2, B3 and B4 and those in circuit C are C1, C2, C3 and
C4.
The following abbreviations are used frequently:
CCN : Carrier Comfort Network
CCn : Operating type: CCN
EXV : Electronic Expansion Valve
LED : Light Emitting Diode
LEN : Sensor Bus (internal communication bus linking
the basic board to the slave boards)
LOFF : Operating type: Local Off
L-On : Operating type: Local On mode
L-Sc : Operating type: Local On following a time
schedule
MASt : Operating type: master unit (master/slave
assembly)
rEM : Operating type: by remote contacts
SCT : Saturated Condensing Temperature
SST : Saturated Suction Temperature