4
1 - SAFETY CONSIDERATIONS
1.1 - General
Installation, start-up and servicing of equipment can be
hazardous if factors particular to the installation are not
considered: operating pressures, electrical components,
voltages and the installation site itself (elevated plinths,
rooftops and built-up structures).
Only highly trained and qualified installation engineers and
technicians, who are fully trained on the product, are
authorised to install and start up this equipment.
During all servicing operations, it is important to read,
understand and follow all the recommendations and
instructions given in the installation and service instructions for
the product, including the tags and labels affixed to the
equipment, components and any parts supplied separately, and
to comply with all other relevant safety regulations.
• Apply all 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 - Avoiding electrocution
Only personnel qualified in accordance with the recommendat-
ions of the IEC (International Electrotechnical Commission)
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:
Risk of electrocution: Even when the main power isolator or
circuit breaker is off, it is still possible for certain components
such as crankcase heaters and trace heaters to be energised,
since they are connected to a separate power source.
Risk of burns: Electrical currents cause components to get hot
either temporarily or permanently. Handle power cables,
electrical cables and conduits, terminal box covers and motor
frames with very great care.
IMPORTANT: This equipment uses and emits electromagnetic
signals. If it is not installed and used in accordance with the
instructions given here, it may cause radio interference. It has
been tested and shown to comply with all applicable codes
regarding electromagnetic compatibility.
2 - GENERAL DESCRIPTION
2.1 - General
PRO-DIALOG Plus is a system for controlling units which use
screw compressors:
• Single or dual circuit
• Air or water-cooled condensers
• Non-reversible heat pumps
PRO-DIALOG Plus controls compressor start-up and demand
limits needed to maintain the desired leaving temperature
setpoint for water. It automatically sets the position of the
electronic expansion valve (if used) to optimise the evaporator
charge. It controls operation of the fans (on air-cooled units) or
water valves (on water-cooled units) to maintain the correct
head pressure in each circuit.
Safety circuits are constantly monitored by PRO-DIALOG
Plus to ensure safe operation of the unit. PRO-DIALOG Plus
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, analogue signals).
• 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 Operating Type
selection button described in section 4.2.2.
When the PRO-DIALOG Plus system operates autonomously
(Local or Remote mode) it retains all of its own control capa-
bilities but does not offer any of the features of the CCN network.
2.2 - Abbreviations used
In this manual the circuits are called circuit A and circuit B.
The compressors in circuit A are labelled A1 and A2. Those in
circuit B are labelled B1 and B2.
The following abbreviations are frequently used:
AI - Analogue Input
AO - Analogue Output
CCn - Operating type: CCN
CCN - Carrier Comfort Network
CPM - Compressor Protection Module
DI - Discrete Input
DO - Discrete Output
EXV - Electronic eXpansion Valve
L-C1 - Operating type: Local cooling - setpoint 1
L-C2 - Operating type: Local cooling - setpoint 2
L-H - Operating type: Local heating
LC1r - Operating type: Local cooling - setpoint 1 - heat
reclaim
LC2r - Operating type: Local cooling - setpoint 2 - heat
reclaim
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