Safety Considerations; General; Avoid Electrocution; General Description - Carrier PRO-DIALOG PLUS 30RW Manual

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.
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2 - GENERAL DESCRIPTION

2.1 - General
Pro-Dialog is a system for controlling single or dual-circuit
30RW water-cooled liquid chillers (cooling only and heat pump
units) or 30RWA units with remote condenser. Pro-Dialog
controls compressor start-up needed to maintain the desired
heat exchanger entering or leaving temperature. 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.

2.2 - Abbreviations used

In this manual, the refrigeration circuits are called circuit A and
circuit B. The compressors in circuit A are labelled A1 and A2.
Those in circuit B are B1 and B2.
The following abbreviations are used frequently:
CCN : Carrier Comfort Network
CCn : Operating type: CCN
LED : Light Emitting Diode
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
SIO : Sensor Bus (internal communication bus linking the
basic board to the slave boards)
SST : Saturated Suction Temperature
TXV : Thermal Expansion Valve