See Fig. 16. The internal timeclock has a 10-hour minimum back-up time to provide for unit power off for servicing unit or during unexpected power outages. For complete Carrier Comfort System (CCS) or Carrier Comfort Network (CCN) features and benefits, refer to the product literature. Step 8 — Make Electrical Connections POWER WIRING — Units are factory wired for the voltage shown on the unit nameplate. When installing units, provide a disconnect per NEC (National Electrical Code) of adequate s

This checkout should not be attempted by anyone not having the required expertise and equipmentto do the job properly. Checking and/or cleaning the heatexchanger involves removing the gas controls assembly andthe flue collector box cover and, when completed, reinstallingthe gas controls assembly for proper operation. Also, the fluecollector box cover must be replaced correctly so that a properseal is maintained. Contact your dealer for the required periodic maintenance. STEP 1 Run Status Service

1 SECTION 1 SECTION 2 LIMIT SWITCH NO. 2 FLUE OUTLET GAS VALVE Fig. 1 — Heat Section Details NOTE: High heat consists of sections 1-3. Low heat consists of sections 1 and 2 only. 055-100 SIZES LOW HEAT NOTE: High heat consists of sections 1 and 2. Low heat consists of section 1 only. 030-050 SIZES a48-8445a a48-8445b GAS VALVE FLUE OUTLET LIMIT SWITCH NO. 1 SECTION 1 LIMIT SWITCH NO. 2 SECTION 2 FLUE OUTLET GAS VALVE SECTION 3 FLUE OUTLET GAS VALVE Fig. 1 — Heat Section Details (cont) NOTE: High

as the enzymatic activity will be destroyed. 5. Thoroughly apply Totaline environmentally sound coil cleaner solution to all coil surfaces including finned area, tube sheets and coil headers. 6. Hold garden sprayer nozzle close to finned areas and apply cleaner with a vertical, up-and-down motion. Avoid spraying in horizontal pattern to minimize potential for fin damage. 7. Ensure cleaner thoroughly penetrates deep into finned gueas. 8. Interior and exterior finned meas must be thoroughlycleaned

Consult a qualified installer, service agency, or your local gas supplier for information or assistance. FOR YOUR SAFETY What to do if you smell gas: 1. Do not try to light any appliance. 2. Do not touch any electrical switch. 3. Do not use any phone in your building. Immediately call your gas supplier from a neighbor s phone. Follow tne gas supplier’s instructions. 4. If you cannot reach your aas supplier, call the fire department. NOTE TO INSTALLER: This manual must be left with the eq

The maximum delay is 3 minutes. Once modified, the fan off delay will not change back to 45 seconds unless power is reset to the control. If the unit is controlled through a room sensor, the indoor fan will be operating in the Occupied mode and turned off after 45 seconds in the Unoccupied mode. GAS HEATING, VARIABLE AIR VOLUME (VAV) UNITS — All of the gas heating control is performed through the integrated gas control (IGC) board. The base module board serves only to initiate and terminate heat

If your unit makes an especially loud noise when the main burners are ignited, shut down the heating section and call your dealer. Proceed as follows to inspect the combustion area and power- venting system of your unit. 1. Turn off electrical power and gas supply to your unit. 2. Remove burner access panel. (See Fig. 1.) 3. Using a flashlight, carefully inspect the burner areas for dirt, soot, rust, or scale. See Fig. 2. If dirt, soot, rust, or scale accumulations are found, call your dealer an

Use a soap-and-water solution. A failure to heed this warning could result in personal injury or death. 4. Turn gas supply manual shut-off valve on and check inlet pressure tap plug for leaks. 5. Turn furnace gas valve control knob to ON and check all threaded pipe connections for gas leaks. 6. Turn on electrical supply. 7. When pilot ignites, check pilot gas-supply tube connections for leaks. When main burners ignite, check manifold orifices for gas leaks. 8. Determine gas input: a. Turn

WARNING: If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life. — 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 GAS • Do not try to light any appliance. • Do not touch any electrical switch; do not use any phone in your building. • Immediately call your gas supplier from a neighbor’s phone. Follow the gas suppl

Contact your dealer for the required periodic maintenance. Fans and Fan Motor — Periodically check the condition of fan wheels and housings and fan-motor shaft bearings. No lubrication of condenser-or evaporator-fan bearings or motors is required or recommended. Evaporator and Condenser Coils — Cleaning of the coils should only be done by qualified service personnel. Contact your dealer for the required annual maintenance. Condensate Drain — The drain pan and condensate drain line should be chec