Carrier 40RU Installation, Start-up And Service Instructions Manual

Contents

19Power Supply and Wiring -- Check the unit data plate toensure that available power supply matches electricalcharacteristics of the unit. Provide a disconnect switchwith an integrated lock--out feature of size required toprovide adequate fan motor starting current. See Tables4--6 for unit electrical data.ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personalinjury or death.Do not use gas piping as an electrical ground. Unitcabinet must have an uninterrupted, unbroken electricalground to minimize the possibility of personal injury ifan electrical fault should occur. This ground may consistof electrical wire connected to unit ground lug in controlcompartment, or conduit approved for electrical groundwhen installed in accordance with NEC (NationalElectrical Code); ANSI/NFPA 70, latest edition (inCanada, Canadian Electrical Code CSA [CanadianStandards Association] C22.1), and local electricalcodes.! WARNINGFIRE HAZARDFailure to follow this warning could result in intermittentoperation or performance satisfaction.Do not connect aluminum wire between disconnectswitch and fan coil unit. Use only copper wire.(See Fig. 15)! WARNINGCOPPERWIRE ONLYELECTRICDISCONNECTSWITCHALUMINUMWIREA93033Fig. 15 -- Disconnect Switch and UnitInstall disconnect switch and power wiring in accordancewith all applicable local codes. See Fig. 15--17 and theunit label diagram. For units with motor sizes less than 5Hp (3.7 kW), connect power wiring to unit with no. 10ring terminal. For units with motor sizes of 5 Hp (3.7 kW)or more, connect power wiring with 1 / 4 --in. ring terminal.FILTERELEMENTSFILTERRETAINERCLIPFAN SCROLLCONDENSATEDRAINCONNECTION(HORIZONTAL)MOTORAND DRIVEFANCONTACTORBOXWIREACCESSCOILFAN DRIVEPULLEYTXV BULBACCESSREFRIGERANTPIPING ACCESSCONDENSATEDRAINCONNNECTION(VERTICAL)LEGENDTXV — Thermostatic Expansion ValveC10693Fig. 16 -- Wiring and Service Access(Side Panel Removed)The 40RU size 07--16 units that have motors wired for460--v, 3--ph, 60 Hz operation can be field--converted to208/230--v, 3--ph, 60 Hz operation. Rewire the motoraccording to the diagram plate on the motor. Afterreconfiguring the motor, mark the motor specifying 208--v or230--v operation replacing the 460--v sticker information onthe units’ corner post.Fan motors are factory--installed on all units. Indoor--fancontactors are located in the fan contactor box behind theside access panel (see Fig. 16 and 17). Wire the thermostatto the 24--v control circuit terminal block located in theside of the fan contactor control box, according to Fig. 18or the unit label diagram. If the air handler is part of asplit system, complete the wiring from the condensingunit to the thermostat shown in Fig. 18.232221131211105°C 600V R J AWFANCONTACTOR24VTERMINALBLOCKPOWERWIRINGKNOCKOUTC10694Fig. 17 -- Fan Contactor Box and Terminal Block(Cover Removed) (Typical)40RU