22. Replace blower access door and secure with 2 screws (downflow furnace only). CLEANING HEAT EXCHANGER The following steps should be performed by a qualified service technician: NOTE: Deposits of soot and carbon indicate the existence of a problem which needs to be corrected. Take action to correct the problem. If it becomes necessary to clean the heat exchanger because of carbon deposits, soot, etc., proceed as follows: 1. Turn off gas and power to furnace. 2. Remove 2 screws from blower acce

If fuse replacement is required, use ONLY a 3-amp fuse of identical size. PILOT — Check the pilot and clean if necessary at the beginning of each heating season. The pilot flame should be high enough for proper impingement of the flame-sensing element (or thermocouple) and to light the burners. Remove the accumulation of soot and carbon from the flame-sensing element (or thermocouple). Refer to Fig. 7 for proper location of pilot on burner assembly. TROUBLESHOOTING — Page 8 contains a troublesho

Do not use throwaway filters in place of cleanable filters. Never operate your unit without filters in place. Failure to heed this warning may result in damage to the blower motor and/or compressor. An accumulation of dust and lint on internal parts of your unit can cause loss of efficiency and, in some cases, fire. Table 1 — Indoor-Air Filter Data UNIT SIZE 48TJ INDOOR-AIR FILTERS (Throwaway Fiberglass) QUANTITY SIZE (in.) 004-007 2 16 x 25 x 2 008,009 4 16 x 20 x 2 012,014 4 20 x 20 x 2 NOTE:

NOTE: Before proceeding with the next check, turn OFF the electrical power supply to the unit. Remove the control access door. ( ) During the heating season, check the control dial on the gas valve. Is it in the ON position? If it is not, be sure it has not been turned off for safety reasons. If no safety hazards are present, follow the start-up procedures in this manual. ( ) If your unit still fails to operate, call your servicing dealer for troubleshooting and repairs. Specify the model and se

Step 9— Open the manual gas valve. Step 10 — Set room thermostat selector slightly above room temperature to start unit. The induced-draft combustion air fan will start. Main gas valve will open and main burners should ignite within 5 seconds. If the burners do not light, there is a 22-second delay before another 5-second try. If the burner still does not light, the time delay is repeated. If the burner does not light within 15 minutes, there is a lockout. If burners still do not light, call for

— Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. — WHAT TO DO IF YOU SMELL OIL: — Do not try to light any appliance. — Do not touch any electrical switch; do not use any phone in your building. • Immediately call your fuel supplier from a neighbor’s phone. Follow the fuel supplier’s instructions. • If you cannot reach your fuel supplier, call the fire department. — Installation and service must be performed by a qualified instal

Note: 2-sec. ON-delay. 13 LIMIT OR FLAME ROLL-OUT (FRS) SWITCH LOCKOUT -Auto-reset after three hours. FRS switch requires manual-reset. Check for: -Refer to #33 14 IGNITION LOCKOUT -Control will auto-reset after three hours. Refer to #34. 21 GAS HEATING LOCKOUT -Control will NOT auto-reset. Check for: -Mis-wired gas valve -Defective control (valve relay) 22 ABNORMAL FLAME-PROVING SIGNAL -Flame is proved while gas valve is de-energized. Inducer will run until fault is cleared. Check for: -Leaky g

See “Performing Routine Maintenance” section in this manual. Then proceed as follows: STEPS FOR STARTING YOUR FURNACE 1. Open all warm air registers and make sure that all return-air grills are unobstructed. 2. If a humidifier is installed with your system, open the water supply valve. 3. Make sure blower access door is secured in place. 4. Set your room thermostat to the lowest temperature setting. (See Fig. 5.) ® 5 5. Turn on electric power to the furnace. (See Fig. 6.) 6. Open the oil supply

Such occurrences will take place only if the unit is mistreated or not properly maintained. The operation and care of your unit is simple and easy. By following these operating and maintenance procedures, you can expect to receive better, longer, and more reliable service from your new Carrier appliance. Here Are a Few "Do's" and "Don'ts" • Do become familiar with wallcard instructions. • Do use filters Check them periodically and make sure that they are clean. • Don't set your thermostat t

10.) 9 10 4. If applicable, turn off water supply to humidifier. 5. If furnace blower will be necessary for cooling system, remember to turn electric power back on when needed for air conditioning. 6. If the furnace is being shut down because of a malfunction, call your dealer as soon as possible. ALWAYS KEEP MAIN OIL VALVE TURNED OFF IF BURNER IS SHUT DOWN FOR AN EXTENDED PERIOD OF TIME. PERFORMING ROUTINE MAINTENANCE With proper maintenance and care, your furnace will operate economically and