Carrier 58CU0A Series Installation, Start-up, Operating And Service And Maintenance Instructions

Carrier 58CU0A Series Installation, Start-up, Operating And Service And Maintenance Instructions Manual pdf 16 page image

16ELECTRICAL SHOCK AND FIRE HAZARDFailure to follow this warning could result in personalinjury, death, or property damage.The cabinet MUST have an uninterrupted or unbrokenground according to current edition of NEC NFPA 70 orlocal codes to minimize personal injury if an electrical faultshould occur. This may consist of electrical wire, conduitapproved for electrical ground or a listed, grounded powercord (where permitted by local code) when installed inaccordance with existing electrical codes. Refer to thepower cord manufacturer’s ratings for proper wire gauge.Do not use gas piping as an electrical ground.! WARNINGFURNACE MAY NOT OPERATEFailure to follow this caution may result in intermittentfurnace operation.Furnace control must be grounded for proper operation orelse control will lock out. Control must remain groundedthrough green/yellow wire routed to gas valve and gasvalve mounting bracket screw.CAUTION!115--V WIRINGVerify that the voltage, frequency, and phase correspond to thatspecified on unit rating plate. Also, check to be sure that serviceprovided by utility is sufficient to handle load imposed by thisequipment. Refer to rating plate or Table 6 for equipmentelectrical specifications.Make all electrical connections in accordance with current editionof National Electrical Code (NEC) NFPA 70 and any local codesor ordinances that might apply.FIRE HAZARDFailure to follow this warning could result in personalinjury, death, or property damage.Do not connect aluminum wire between disconnect switchand furnace. Use only copper wire.! WARNINGUse a separate, fused branch electrical circuit with a properlysized fuse or circuit breaker for this furnace. See Table 6 for wiresize and fuse specifications. A readily accessible means ofelectrical disconnect must be located within sight of the furnace.NOTE: Proper polarity must be maintained for 115--v wiring. Ifpolarity is incorrect, control LED status indicator light willrapidly flash RED and furnace will NOT operate.J--BOX RELOCATIONNOTE: If factory location of J--Box is acceptable, go to nextsection (ELECTRICAL CONNECTION TO J--BOX).1. Remove and save two screws holding J--Box.NOTE: The J--Box cover need not be removed from the J--Boxin order to move the J--Box. Do NOT remove green groundscrew inside J--Box.2. Cut wire tie on loop in furnace wires attached to J--box.3. Move J--Box to desired location.4. Fasten J--Box to casing with two screws removed in Step 1.5. Route J--Box wires within furnace away from sharp edges,rotating parts and hot surfaces.ELECTRICAL CONNECTION TO J--BOXElectrical Box on Furnace Casing SideFIRE OR ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personalinjury, death, or property damage.If field--supplied manual disconnect switch is to be mountedon furnace casing side, select a location where a drill orfastener cannot damage electrical or gas components.! WARNING1. Select and remove a hole knockout in the casing where theelectrical box is to be installed.NOTE: Check that duct on side of furnace will not interfere withinstalled electrical box.2. Remove the desired electrical box hole knockout and posi-tion the hole in the electrical box over the hole in the fur-nace casing.3. Fasten the electrical box to casing by driving two fieldsupplied screws from inside electrical box into casingsteel.4. Remove and save two screws holding J--Box.5. Pull furnace power wires out of 1/2--in. (12 mm) diameterhole in J--Box. Do not loosen wires from strain--reliefwire--tie on outside of J--Box.6. Route furnace power wires through holes in casing andelectrical box and into electrical box (see Fig. 22)7. Pull field power wires into electrical box.8. Remove cover from furnace J--Box.9. Route field ground wire through holes in electrical boxand casing, and into furnace J--Box.10. Reattach furnace J--Box to furnace casing with screws re-moved in Step 4.11. Secure field ground wire to J--Box green ground screw.12. Complete electrical box wiring and installation. Connectline voltage leads as shown in Fig. 24. Use best practices(NEC in U.S. for wire bushings, strain relief, etc.)13. Reinstall cover to J--Box. Do not pinch wires betweencover and bracket.POWER CORD INSTALLATION IN FURNACE J--BOXNOTE: Power cords must be able to handle the electricalrequirements listed in Table 6. Refer to power cordmanufacturer’s listings.1. Remove cover from J--Box.2. Route listed power cord through 7/8--in. (22 mm) diameterhole in J--Box.3. Secure power cord to J--Box bracket with a strain reliefbushing or a connector approved for the type of cord used.4. Secure field ground wire to green ground screw on J--Boxbracket.5. Connect line voltage leads as shown in Fig. 24.6. Reinstall cover to J--Box. Do not pinch wires betweencover and bracket.BX CABLE INSTALLATION IN FURNACE J--BOX1. Remove cover from J--Box.2. Route BX cable into 7/8--inch diameter hole in J--Box.3. Secure BX cable to J--Box bracket with connectors ap-proved for the type of cable used.4. Secure field ground wire to green ground screw on J--Boxbracket.5. Connect line voltage leads as shown in Fig. 24.6. Reinstall cover to J--Box. Do not pinch wires betweencover and bracket.