Carrier 38MA R Series Installation Instructions Manual

Also see for 38MA R Series: Installation instructions

14 Specifications subject to change without notice. 38MAR-04SIStep 6 - Electrical ConnectionsInstall All Power and Interconnecting Wiring toOutdoor Units1. Mount the outdoor power disconnect.2. Run the power wiring from the main box to disconnect per NECand local codes.3. Remove the field wiring cover from the unit by loosening thescrews.4. Remove the caps on the conduit panel.5. Connect the conduit to conduit panel (see Fig. 22).6. Properly connect both the power supply and control lines to theterminal block per the connection diagram for the appropriate unitcapacity and voltage.7. Ground the unit in accordance with NEC and local electrical codes.8. Use the lock nuts to secure the conduit.9. Reinstall the field wiring cover.Fig. 22 —Field WiringWIRINGAll wires must be sized per NEC (National Electrical Code) or CEC(Canadian Electrical Code) and local codes. Use Electrical Data table MCA(minimum circuit amps) and MOCP (maximum over current protection) tocorrectly size the wires and the disconnect fuse or breakers respectively.Power and Communication Wiring: The main power is supplied tothe outdoor unit. The field supplied 14/3 power/communicationwiring, from the outdoor unit to the indoor unit, consists of four (4)wires and provides the power for the indoor unit. Two wires are highvoltage AC power, one is communication wiring and the other is aground wire.To minimize communication interference: If installed in a highElectromagnetic field (EMF) area and communication issues arise, a14/2 stranded shielded wire can be used to replace 2 (L2/N) and 3 (S)between the outdoor and indoor units - landing the shield onto theground in the outdoor unit only.Table 9 — Wiring SizesNOTE: Matching with Conventional or Multi-Family Fan Coilsrequires separate power for the indoor and outdoor units. A 24Vinterface kit is required for compatibility. Refer to the 24V InterfaceKit Installation Manual.EQUIPMENT DAMAGE HAZARDFailure to follow this caution may result in equipment damage orimproper operation.Be sure to comply with local codes while running wire fromindoor unit to outdoor unit.Every wire must be connected firmly. Loose wiring may cause theterminal to overheat or result in unit malfunction. A fire hazardmay also exist. Therefore, ensure all wiring is tightly connected.No wire should be allowed to touch the refrigerant tubing,compressor or any moving parts.Disconnecting means must be provided and shall be locatedwithin sight and readily accessible from the air conditioner.Connecting cable with the conduit shall be routed through hole inthe conduit panel.CAUTIONOver 1.57" (40mm)Terminal BlockConduit panelConduitOutdoor unitCABLE CABLE SIZE REMARKSConnection Cable 14AWG 3 wire + Ground 1Φ 208/230 V(Stranded wire is recommended)EQUIPMENT DAMAGE HAZARDFailure to follow this caution may result in equipment damage orimproper operation. Wires should be sized based on NEDC andlocal codes.WARNINGEQUIPMENT DAMAGE HAZARDFailure to follow this caution may result in equipment damage orimproper operation. Be sure to comply with local codes whilerunning wire from the indoor unit to the outdoor unit. Every wiremust be connected firmly. Loose wiring may cause the terminal tooverheat or result in unit malfunction. A fire hazard may also exist.Ensure all wiring is tightly connected.No wire should touch the refrigerant tubing, compressor or anymoving parts. Disconnecting means must be provided and shall belocated within sight and readily accessible from the air conditioner.Connecting cable with conduit shall be routed through the hole inthe conduit panel.CAUTION