Carrier 38GJQ Series Installation Instructions Manual

Also see for 38GJQ Series: Owner's manual

10WIRINGAll wires must be sized per NEC (National Electrical Code) orCEC (Canadian Electrical Code) and local codes. Use the ElectricalData table MCA (minimum circuit amps) and MOCP (maximumover current protection) to correctly size the wires and thedisconnect fuse or breakers respectively.Per the caution note, only copper conductors with a 600 voltinsulation rating wire must be used.Sizes 18−42Recommended Connection Method for Power andCommunication Wiring:The main power is supplied to the outdoor unit. The field supplied14/3 stranded wire with ground with a 600 volt insulation rating,power/communication wiring from the outdoor unit to indoor unitconsists of four (4) wires and provides the power for the indoorunit. Two wires are line voltage AC power, one is communicationwiring (S) and the other is a ground wire.Wiring between the indoor and outdoor unit is polarity sensitive.The use of BX wire is NOT recommended.If installed in a high Electromagnetic field (EMF) area andcommunication issues exist, a 14/2 stranded shielded wire can beused to replace L2 and (S) between the outdoor and indoor unitlanding the shield onto the ground in the outdoor unit only.Sizes 48−56Recommended Connection Method for Power andCommunication − Wiring − Power and CommunicationWiring:Power Wiring OUTDOOR UNIT& BRANCH BOXES:Separate power supplies are required for the OUTDOOR UNITand the BRANCH BOXES. The indoor units are powered by theBranch Boxes. The field supplied 14/3 stranded wire (with ground)with a 600 volt insulation rating, power/communication wiringfrom the BRANCH BOXES to INDOOR UNITS consists of four(4) wires and provides the indoor unit’s power. Two wires are linevoltage AC power; one is communication wiring (S) and the otheris a ground wire.Wiring between the indoor unit and the branch box is polaritysensitive.The use of BX wire is NOT recommended.Up to three (3) Branch Boxes can be powered from the same 15amp breaker.Communication Wiring:A separate shielded copper conductor only, must be used as thecommunication wire from the OUTDOOR UNIT to theBRANCH BOX.Please use a separate shielded 16GA stranded control wire.See the wiring diagram in the wiring diagram section for sizes48−56.CAUTION!EQUIPMENT DAMAGE HAZARDFailure to follow this caution may result in equipmentdamage or improper operation. Wires should be sized based on NEC and local codes. Use copper conductors only with a 600 volt insulationrating wire.CAUTION!EQUIPMENT DAMAGE HAZARD Be sure to comply with local codes while running wirefrom the indoor unit to the outdoor unit. Every wire must be connected firmly. Loose wiring maycause the terminal to overheat or result in unitmalfunction. A fire hazard may also exist. Ensure allwiring is tightly connected. No wire should touch the refrigerant tubing, compressoror any moving parts. Disconnecting means must be provided and shall belocated within sight and readily accessible from the airconditioner. Connecting cable with conduit must be routed through thehole in the conduit panel.