Carrier 50TCQA Installation Instructions Manual

Also see for 48TC*D: Service and maintenance instructions Installation instructions

Contents

11NOTE: Trap should be deep enough to offset maximum unit staticdifference. A 4” (102) trap is recommended.MINIMUM PITCH1” (25mm) PER10’ (3m) OF LINE BASE RAILOPENVENTTO ROOFDRAINDRAIN PLUGROOFCURBSEE NOTE2˝ (51) MINC08022Fig. 14 -- Condensate Drain Piping DetailsAll units must have an external trap for condensatedrainage. Install a trap at least 4-in. (102 mm) deep andprotect against freeze-up. If drain line is installeddownstream from the external trap, pitch the line awayfrom the unit at 1-in. per 10 ft (25 mm in 3 m) of run. Donot use a pipe size smaller than the unit connection( 3/4 -in.).Step 10 — 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.! WARNINGNOTE: Check all factory and field electrical connectionsfor tightness. Field--supplied wiring shall conform withthe limitations of 63_F (33_C) rise.Field 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 208-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 or terminal board (see wiring diagram labelfor control box component arrangement) or atfactory--installed option non--fused disconnect switch.Max wire size is #2 AWG (copper only). (See Fig. 16)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.! WARNINGFIRE HAZARDFailure to follow this warning could result inintermittent operation or performance satisfaction.Do not connect aluminum wire between disconnectswitch and furnace. Use only copper wire.(See Fig. 15.)COPPERWIRE ONLYELECTRICDISCONNECTSWITCHALUMINUMWIREA93033Fig. 15 -- Disconnect Switch and UnitUnits 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.50TCQA