Carrier 30RA/RH, 30RY/RYH SAFETY CONSIDERATIONS 1.1 - General, Avoid electrocution, Fanstart-up

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.

Fanstart-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 - GENERAL DESCRIPTION

2.1 - General

Pro-Dialog is a system for controlling single or dual-circuit 30RA/RY air-cooled liquid chillers or air-to-water 30RH/RYH 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 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 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, A2 and A3. Those in circuit B are B1, B2 and B3.

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

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