Carrier 50HCQA07 Installation Instructions Manual

Also see for 50HCQD07: Installation instructions

16Fig. 21 — Power Wiring ConnectionsALL UNITSAll field wiring must comply with NEC and all local codes.Size wire based on MCA (Minimum Circuit Amps) on the unitinformative plate. See Fig. 21 and the unit label diagram forpower wiring connections to the unit power terminal blocksand equipment ground. Maximum wire size is #2ga AWG(copper only) per pole.Provide a ground fault and short circuit over-current protectiondevice (fuse or breaker) per NEC Article 440 (or local codes).Refer to unit informative data plate for MOCP (MaximumOver-Current Protection) device size.All field wiring must comply with the NEC and local requirements.All units except 208/230v units are factory wired for the volt-age shown on the nameplate. If the 208/230v unit is to be con-nected to a 208v power supply, the control transformer must berewired by removing the black wire with the 1 /4-in. femalespade connector from the 230v connection and moving it to the200v 1 /4-in. male terminal on the primary side of the transform-er. Refer to unit label diagram for additional information.Field power wires will be connected at line-side pressure lugson the power terminal block or at factory-installed option non-fused disconnect.NOTE: Check all factory and field electrical connections fortightness.Voltage to compressor terminals during operation must bewithin voltage range indicated on unit nameplate. On 3-phaseunits, voltages between phases must be balanced within 2%and the current within 10%. Use the formula shown in the ex-ample below to determine the percent of voltage imbalance.Operation on improper line voltage or excessive phase imbal-ance constitutes abuse and may cause damage to electricalcomponents. Such operation would invalidate any applicableCarrier warranty.NOTE: Check all factory and field electrical connections for tight-ness.CONVENIENCE OUTLETSTwo types of convenience outlets are offered on 50HCQ mod-els: non-powered and unit-powered. Both types provide a 125-volt GFCI (ground-fault circuit interrupter) duplex receptaclerated at 15A behind a hinged waterproof access cover, locatedon the end panel of the unit. See Fig. 22.Fig. 22 — Convenience Outlet LocationInstalling Weatherproof CoverA weatherproof while-in-use cover for the factory-installedconvenience outlets is now required by UL standards. Thiscover cannot be factory-mounted due its depth; it must be in-stalled at unit installation. For shipment, the convenience outletis covered with a blank cover plate.The weatherproof cover kit is shipped in the unit’s control box.The kit includes the hinged cover, a backing plate, and gasket.1. Remove the blank cover plate at the convenience outlet;discard the blank cover.2. Loosen the two screws at the GFCI duplex outlet, untilapproximately 1/2 in. (13 mm) under screw heads isexposed. Press the gasket over the screw heads.3. Slip the backing plate over the screw heads at the keyholeslots and align with the gasket; tighten the two screwsuntil snug (do not over-tighten).4. Mount the weatherproof cover to the backing plate asshown in Fig. 23.Units Without Disconnect OptionUnits With Disconnect Option246135L1L2L3OptionalDisconnectSwitchDisconnect factory test leads; discard.FactoryWiring11 13 13L1 L2 L3TBCIFC(3 PhaseIndoor Motor)(1 Phase Indoor Motorand 3 Phase Unit)208/230-3-60460-3-60575-3-60DisconnectperNEC11 23C208/230-1-60DisconnectperNECWARNINGELECTRICAL OPERATION HAZARDFailure to follow this warning could result in personalinjury or death.Units with convenience outlet circuits may use multipledisconnects. Check convenience outlet for power statusbefore opening unit for service. Locate its disconnectswitch, if appropriate, and open it. Lock-out and tag-outthis switch, if necessary.WARNINGFailure to follow this warning could result in personalinjury or death.Disconnect all power to unit and convenience outlet.Lock-out and tag-out all power.CONVENIENCEOUTLET GFCIPWD-CO FUSESWITCHPWD-CO TRANSFORMERCONTROL BOXACCESS PANEL