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

Press the arrow key until ‘‘Sr1’’ is displayed. This is the VFD set point listed in Table 7. 5. Press the ‘‘READ/WRITE’’ key. The set point value will be displayed. Use the up-arrow or down-arrow key to adjust the set point value to the value desired. 6. Press the ‘‘READ/WRITE’’ key again to enter the new value. 7. Check the factory default values. IMPORTANT: The Carrier factory default values for the VFD may be different than the default values of the manufacturer. Refer to the Carrier literat

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

10. Return power to unit. Disable Economizer — For applications where the economizer will not be used (areas of high humidity), the economizer should be disabled. To disable the economizer, perform the following: 1. Turn of power. Lock out disconnect. 2. Locate the OAT (Outdoor Air Thermostat) in the right hand outdoor air damper area. 3. Locate the splice connecting the violet wire coming from T24 on the base module board to the red wire coming from T29 on the base module board. Remove the wire

Check convenience outlet for power status before opening unit for service. Locate its disconnect switch, if appropriate, and open it. Lock- -- out and tag- -- out this switch, if necessary. 20 21 Two types of convenience outlets are offered on 48HC models: Non--unit powered and unit--powered. Both types provide a 125--volt GFCI (ground--fault circuit--interrupter) duplex receptacle rated at 15--A behind a hinged access cover, located on the corner panel of the unit. See Fig. 26. Convenience Outl

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

5. Observe unit heating operation, and watch the burnerflame core to see if it is bright blue. If you observe a suspected malfunction, or if the burner flame cores are notbright blue, call your dealer. See Fig. 5. NOTE: Burner flame cores that have a mixture of orange, yellow, or red flames together with the blue may not beburning gas efficiently. Your dealer may have to adjustthe air/gas mixture. 6. Replace gas section access panel. Unit Panels and Doors — After performing any maintenance or se

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

The kit can be used to convert propane gas 100% shutoff IID controls to natural 100% shutoff IID. It is designed for use in furnaces with 30,000- thru 100,000-Btuh nominal output capacity. These furnaces are to be installed only within California. NOTE: The definition of 100% shutoff refers to automatic shutoff of the pilot and main burner gas when the ignition source is not proven. NOTE: Read the entire instructions before starting the installation. There are additional parts shipped in the k