Carrier 48TC Installation Instructions Manual

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Contents

12not use a pipe size smaller than the unit connection( 3/4 -in.).Step 12 — Make Electrical ConnectionsELECTRICAL 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, unbrokenelectrical ground to minimize the possibility ofpersonal injury if an electrical fault should occur. Thisground may consist of electrical wire connected tounit ground lug in control compartment, or conduitapproved for electrical ground when installed inaccordance with NEC (National Electrical Code);ANSI/NFPA 70, latest edition (in Canada, CanadianElectrical Code CSA [Canadian StandardsAssociation] C22.1), and local electrical codes.! WARNINGField Power Supply —If equipped with optional Powered Convenience Outlet:The power source leads to the convenience outlet’stransformer primary are not factory connected. Installermust connect these leads according to required operationof the convenience outlet. If an always--energizedconvenience outlet operation is desired, connect thesource leads to the line side of the unit--mounteddisconnect. (Check with local codes to ensure this methodis acceptable in your area.) If a de--energize via unitdisconnect switch operation of the convenience outlet isdesired, connect the source leads to the load side of theunit disconnect. On a unit without a unit--mounteddisconnect, connect the source leads to compressorcontactor C and indoor fan contactor IFC pressure lugswith unit field power leads.All units except 208/230-v units are factory wired for thevoltage shown on the nameplate. If the 208/230-v unit isto be connected to a 208-v power supply, the controltransformer must be rewired by moving the black wirewith the 1/4 -in. female spade connector from the 230--vconnection and moving it to the 200-v 1/4 -in. maleterminal on the primary side of the transformer. Refer tounit label diagram for additional information. Field powerwires will be connected line--side pressure lugs on thepower terminal block or at factory--installed optionnon--fused disconnect.Field power wires are connected to the unit at line--sidepressure lugs on compressor contactor C and indoor fancontactor IFC (see wiring diagram label for control boxcomponent arrangement) or at factory--installed optionnon--fused disconnect switch. Max wire size is #2 AWG(copper only).NOTE: TEST LEADS -- Unit may be equipped withshort leads (pigtails) on the field line connection points oncontactor C or optional disconnect switch. These leads arefor factory run--test purposes only; remove and discardbefore connecting field power wires to unit connectionpoints. Make field power connections directly to lineconnection pressure lugs only.Units Without Factory--Installed Disconnect —When installing units, provide a disconnect switch perNEC (National Electrical Code) of adequate size.Disconnect sizing data is provided on the unit informativeplate. Locate on unit cabinet or within sight of the unit pernational or local codes. Do not cover unit informativeplate if mounting the disconnect on the unit cabinet.Units with Factory--Installed Disconnect —The factory--installed option disconnect switch is locatedin a weatherproof enclosure located under the maincontrol box. The manual switch handle is accessiblethrough an opening in the access panel.All units --All field wiring must comply with NEC and all localcodes. Size wire based on MCA (Minimum Circuit Amps)on the unit informative plate. See Fig. 21 for power wiringconnections to the unit power terminal block andequipment ground. Maximum wire size is #2 ga AWG perpole.Provide a ground--fault and short--circuit over--currentprotection device (fuse or breaker) per NEC Article 440(or local codes). Refer to unit informative data plate forMOCP (Maximum Over--current Protection) device size.DisconnectperNECDisconnectperNEC208/230-1-6011 13 11 13 13L1 L2 L3TBC C IFC or(1-phIFM)208/230-3-60460-3-60375-3-60575-3-60Units Without Disconnect OptionUnits With Disconnect Option246135L1L2L3OptionalDisconnectSwitchDisconnect factory test leads; discard.FactoryWiringC07494Fig. 21 -- Power Wiring ConnectionsAll field wiring must comply with the NEC and localrequirements.48TC