Carrier PG8JEA Installation, Start-up, Operating And Service And Maintenance Instructions

21ELECTRICAL 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.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. 25. 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 7. 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. 25.6. 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.A10141Fig. 23 -- Field--Supplied Electrical Box on Furnace Casing5. Connect line voltage leads as shown in Fig. 25 .6. Reinstall cover to J--Box. Do not pinch wires betweencover and bracket.24--V WIRINGMake field 24--v connections at the 24--v terminal strip. (See Fig.23.) Connect terminal Y/Y2 as shown in Fig. 24 for propercooling operation. Use only AWG No. 18, color--coded, copperthermostat wire.The 24--v circuit contains an automotive--type, 3--amp. fuselocated on the control. Any direct shorts during installation,service, or maintenance could cause this fuse to blow. If fusereplacement is required, use ONLY a 3--amp. fuse of identicalsize.ACCESSORIES1. Electronic Air Cleaner (EAC)Connect an accessory Electronic Air Cleaner (if used) us-ing 1/4--in female quick connect terminals to the two male1/4--in quick--connect terminals on the control boardmarked EAC--1 and EAC--2. The terminals are rated for115 VAC, 1.0 amps maximum and are energized duringblower motor operation. (See Fig. 24.)2. Humidifier (HUM)Connect an accessory 24 VAC, 0.5 amp. maximum hu-midifier (if used) to the 1/4--in male quick--connect HUMterminal and COM--24V screw terminal on the controlboard thermostat strip. The HUM terminal is energizedwhen gas valve relay (GVR) is energized. (See Fig. 24.)NOTE: A field--supplied, 115--v controlled relay connected toEAC terminals may be added if humidifier operation is desiredduring blower operation.NOTE: DO NOT connect furnace control HUM terminal toHUM (humidifier) terminal on humidity sensing thermostat, zonecontroller or similar device. See humidity sensing thermostat,zone controller, thermostat, or controller manufacturer’sinstructions for proper connection.PG8MEA