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 volt
-
ages and the installation site (elevated plinths and built-up struc-
tures). Only properly qualied installation engineers and highly
qualied
installers and technicians, fully trained for the product,
are authorised to install and start-up the equipment safely. Dur
-
ing 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 xed 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 qualied 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 conforms to all applicable
codes regarding electromagnetic compatibility.
2 - GENERAL DESCRIPTION
2.1 - General
Pro-Dialog is an electronic control system to regulate units of
the following types:
• air-cooled liquid chillers
• reversible heat pumps.
These units have one or two refrigerant circuits.
Pro-Dialog controls:
• compressor start-up to control the water loop
• the fans to optimise operation of each refrigerant circuit
• the defrost cycles to ensure the operation of the
refrigerant circuits (reversible heat pumps only).
As standard Pro-Dialog offers three on/off commands:
• Local - on/off command using the keyboard
• Remote - wired on/off command using volt-free contacts
• Network - proprietary protocol on/off command.
The command type is selected in advance by keyboard.
2.2 - Abbreviations used
In this manual, the refrigerant circuits are called circuit A and
circuit B. The compressors in circuit A are labelled A1, A2 and
A3. Those in circuit B are B1 and B2.
The following abbreviations are used frequently:
LED Light Emitting Diode
LEN Internal communication bus linking the main board to
the slave boards
SCT Saturated condensing temperature
SST Saturated suction temperature
EXV Electronic expansion valve
PD-AUX Auxiliary input/output board
EREBA ACCESS EN - 2
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