Carrier 38XTZ 007-024 Installation, Operation And Maintenance Instructions

283. Belt tension (see Fig. 39)The minimum belt deflection is 10 mm when the forceshown in Fig. 39 is applied.Fan pulley2 kg or 3 kgMotorpulleyFig. 39ATTENTION: Once the motor pulley opening or closing hasbeen set, check that the setscrews have been correctlytightened.ELECTRICAL CONNECTIONSWARNING: To prevent electrical shock or equipmentdamage, make sure disconnects are open before electricalconnections are made. If this action is not taken, personalinjury may occur.NOTE: The power supply for the units has to be inaccordance with applicable standards and laws, the lowvoltage directive, etc.- Connect the power supply for the complete system(outdoor unit and indoor unit) via the 38XTZ outdoor unit(see Fig. 40).- Consult the wiring diagram supplied with the unit, thatshows all power connections between the 38XTZ outdoorunit and the 40ABZ/ALZ indoor unit and the general powersupply to the system.- The connection cables between the units must not belighter than the flexible Neoprene-covered cable (typeH05 RN-F), with an appropriate wire section for thesupply to the 40ABZ unit.- The power of the optional electric heater of the indoor unitis supplied via the main disconnect switch of the 38XTZunit (see Fig. 42).Fig. 40 - General unit power supplyLegendQ1: Main unit power supply disconnect switch.Located in the outer panel of the 38XTZ unit.F1: Field-installed fuses.- Route all cables through the conduits in the 38XTZ unitsto the terminals of the main disconnect switch (see unitwiring diagram).- Voltage to the unit must be within 2% of the voltage and10% of the current indicated on the nameplate. Contactyour local power company for correction of an incorrectline voltage.- Take special care when making the earth connection. Thisis the first cable to be connected, and it must be longerthan the live cables.- Operation of the unit on improper line voltage constitutesabuse and is not covered by the Carrier warranty.IMPORTANT: To ensure the correct unit power supply it isnecessary first to determine the wire section. The unitelectrical data (see Table 2, Electrical Data) and the linelength (maximum admissible voltage loss 5%) must be takeninto consideration.If the indoor unit includes an electric heater, this must betaken into consideration when sizing the system powersupply cable (38XTZ-40ABZ/ALZ) and the isolator switchand fuses.- Never operate a unit if the voltage imbalance exceeds 2%.The following formula must be used to determine thepercentage of voltage imbalance.Voltage imbalance % =Largest deviation from average voltageAverage voltageExample: Nominal supply: 400-3-50AB = 404 VBC = 399 VAC = 394 VAverage voltage = 404 + 399 + 394 = 399 = 400 V3Determine maximum deviation from average voltage:AB = 404 - 400 = 4BC = 400 - 399 = 1AC = 400 - 394 = 6Largest deviation is 6 volts. Percentage voltage imbalance istherefore:6 x 100 = 1.5 %400Fig. 41