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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 separ-ately, 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 qualified and experienced personnel should 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 circuit breaker or
isolator is switched off, certain circuits may still be energised,
since they may be connected to a separate power source.
Even when the unit is switched off, the power circuit remains
energised, as long as the unit or circuit disconnect is not open.
Refer to the wiring diagram for details.
Attach appropriate safety labels.
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.
IMPORTANT: This equipment uses and emits electromag-
netic signals. Tests have shown that the equipment conforms
to all applicable codes with respect to electromagnetic
compatibility.
IMPORTANT : If the boards need to be handled wear anti-
static gloves to avoid exposing the electronic components to a
destructive voltage. Only unpack the boards from their anti-
static bag when they need to be installed.
2 - GENERAL DESCRIPTION
2.1 - General
Pro-Dialog is a system for controlling single- or dual-circuit
38RA air-cooled condensing units. The Pro-Dialog system must
be complemented by a programmable or non-programmable
Carrier 33CS thermostat which ensures start-up of the indoor
fan and controls the two cooling stages. This thermostat can
also control the two electric heater stages.
In cooling mode Pro-Dialog controls the operation of the outdoor
fans to maintain the correct condensing pressure in each circuit.
The safety devices are constantly monitored by Pro-Dialog to
ensure unit protection. The heating stages are not controlled by
Pro-Dialog.
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
LED : Light Emitting Diode
SCT : Saturated Condensing Temperature
SIO : Sensor Bus (internal communication bus linking the
basic board to the slave boards)
SST : Saturated Suction Temperature
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