Carrier 30GX Installation, Operation And Maintenance Instructions

Also see for 30GX Series: Installation, operation and maintenance instructions Installation, operation and maintenance instructions

41 - SAFETY CONSIDERATIONS1.1 - GeneralInstallation, start-up and servicing of equipment can behazardous if factors particular to the installation are notconsidered: operating pressures, electrical components,voltages and the installation site itself (elevated plinths,rooftops and built-up structures).Only highly trained and qualified installation engineers andtechnicians, who are fully trained on the product, areauthorised to install and start up this equipment.During all servicing operations, it is important to read,understand and follow all the recommendations andinstructions given in the installation and service instructions forthe product, including the tags and labels affixed to theequipment, components and any parts supplied separately, andto 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 unitscarefully and set them down gently.1.2 - Avoiding electrocutionOnly personnel qualified in accordance with the recommendat-ions of the IEC (International Electrotechnical Commission)may be permitted access to electrical components. It isparticularly recommended that all sources of electricity to theunit be shut off before any work is begun. Shut off the mainpower supply at the main circuit breaker or isolator.IMPORTANT:Risk of electrocution: Even when the main power isolator orcircuit breaker is off, it is still possible for certain componentssuch 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 hoteither temporarily or permanently. Handle power cables,electrical cables and conduits, terminal box covers and motorframes with very great care.IMPORTANT: This equipment uses and emits electromagneticsignals. If it is not installed and used in accordance with theinstructions given here, it may cause radio interference. It hasbeen tested and shown to comply with all applicable codesregarding electromagnetic compatibility.2 - GENERAL DESCRIPTION2.1 - GeneralPRO-DIALOG Plus is a system for controlling units which usescrew compressors:• Single or dual circuit• Air or water-cooled condensers• Non-reversible heat pumpsPRO-DIALOG Plus controls compressor start-up and demandlimits needed to maintain the desired leaving temperaturesetpoint for water. It automatically sets the position of theelectronic expansion valve (if used) to optimise the evaporatorcharge. It controls operation of the fans (on air-cooled units) orwater valves (on water-cooled units) to maintain the correcthead pressure in each circuit.Safety circuits are constantly monitored by PRO-DIALOGPlus to ensure safe operation of the unit. PRO-DIALOG Plusalso gives access to a Quick Test program covering all inputsand outputs.All PRO-DIALOG Plus controls can work in accordance withthree independent modes:• Local mode: the machine is controlled by commands fromthe user interface.• Remote mode: the machine is controlled by remotecontacts (volt-free contacts, analogue signals).• CCN mode: the machine is controlled by commands fromthe Carrier Comfort Network (CCN). In this case a datacommunication cable is used to connect the unit to theCCN communication bus.The operating mode must be chosen with the Operating Typeselection 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 usedIn this manual the circuits are called circuit A and circuit B.The compressors in circuit A are labelled A1 and A2. Those incircuit B are labelled B1 and B2.The following abbreviations are frequently used:AI - Analogue InputAO - Analogue OutputCCn - Operating type: CCNCCN - Carrier Comfort NetworkCPM - Compressor Protection ModuleDI - Discrete InputDO - Discrete OutputEXV - Electronic eXpansion ValveL-C1 - Operating type: Local cooling - setpoint 1L-C2 - Operating type: Local cooling - setpoint 2L-H - Operating type: Local heatingLC1r - Operating type: Local cooling - setpoint 1 - heatreclaimLC2r - Operating type: Local cooling - setpoint 2 - heatreclaim