Carrier 50EN 415 Installation, Operation And Maintenance Instructions

138.4. CARRIERrtc electronic controlThe CARRIERrtc control is basically composed of a μPCMEDIUM control plate, a pGD1 graphical terminal, a TCO userterminal (optional), and sensors.Please refer to this control brochure to obtain more detailedinformation about its operation.pGD1 terminal:This terminal, installed in the electric panel of the machine,allows for:● The initial programming of the unit.● The modification of the operating parameters.● Stopping/starting the unit.● The selection of the operating mode.● Setting the setpoints.● The on-screen view of the controlled variables and the valuesmeasured by the sensors.● The on-screen view of the description of the active alarmsand the alarms log.8 - ELECTRICAL CONNECTION8.1 Installation normsImportant: All connections in the site are theresponsibility of the installer. These connections arealways made as per the current regulation. Always referto the wiring diagram provided with the unit.To prevent electrical shocks, make all electricalconnections before energizing the unit. Check that theautomatic switch is closed. Omitting this can causepersonal damage. Make the ground connection beforeany other electrical connection.V-220005The installer must provide electrical circuit protectionsaccording to the effective legislation.Example:On a 400 V - 3 ph - 50 Hz power supply, the individual phasevoltages were measured with the following values:AB = 406 V; BC = 399 V; AC = 394 VAverage voltage = (406+399+394)/3=1199/3 = 399.7 i.e. 400 VCalculate the maximum deviation from the 400 Vaverage:(AB) = 406 - 400 = 6 -> % = 100 x 6 / 400=1.5(BC) = 400 - 399 = 1 -> % = 100 x 1 / 400=0.25(CA) = 400 - 394 = 6 -> % = 100 x 6 / 400=1.5 MoteurMotor● The name plate data.● The wiring diagram included with the unit.● Norms in effect that regulate the installation of air conditioningunits and electrical receivers in the country of installation.Wiring must be selected based on:● The maximum power input, taking into account all the optionsit features (refer to the technical brochure and the name plate).● The distance between the unit and its power source.● The protection to be placed at the power source.● Neutral operating conditions.● The electrical connections (refer to the wiring diagramprovided with the unit).● The temperature the wiring is exposed to;● The fitting method.After wire sizing has been completed, the installer must verify theappropriate means of connection and define any modificationsnecessary on site.Important: It is the responsibility of the installer to protect theunit from overvoltage coming from the mains or voltage spikescaused by lightning. Depending on the geographic locationand the type of mains network (buried or overhead), a lightningrod needs to be installed. Check the local electrical codes andregulations. Failure to comply with the requirements of standardsin force in the country of installation will void the warranty.Power cable access routingThe power cables can be routed into the electrical box for theunits:● Via the panel located under the electric panel.● Via the base of the unitIt is important to check that the power cable bend radius iscompatible with the connection space available inside theelectric panel.8.3 Wire sizingWire sizing is the responsibility of the installer to suit thecharacteristics of the installation site and comply with applicableregulations.To perform the electric installation of the unit (cable glands,wire sizing and their calculations, protections, etc.), refer to theinformation provided in:● The technical brochure of this series.8.2 Power supplyVerify that power supply agrees with the unit name plate andthat the voltage remains constant.Warning: Operation of the unit with an incorrect supply voltageor excessive phase imbalance constitutes misuse which willinvalidate the manufacturer’s warranty. If the phase imbalanceexceeds 2% for voltage, or 10% for current, contact your localelectricity supplier at once and ensure that the unit is notswitched on until corrective measures have been taken.Voltage phase imbalance (%)% imbalance =100 x max. deviation from average voltageaverage voltage