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It is recommended that the furnace be inspected and serviced on an annual basis (before the heating season) by a qualified service agency. See "User's Information Manual". Continuous-Fan Connect low speed lead from circulating air motor to the "Cont" terminal at the furnace control board. The appropriate motor leads should already be connected to the "Heat" and "Cool" terminals. Heating and Continuous-Fan Speed the Same If it is necessary to operate the heating speed and continuous -fan speed using the same blower speed, connect a jumper between the "Heat" and "Cont" terminals on the furnace control board. Note: There should be only ONE motor lead going to the "Heat" and "Cont" terminals. ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD Failure to follow safety warnings exactly could result in dangerous operation, death, personal injury, or property damage. Improper servicing could result in dangerous operation, serious injury, death or property damage. • Before servicing, disconnect all electrical power to furnace. • When servicing controls, label all wires prior to disconnecting. Reconnect wires correctly. • Verify proper operation after servicing. _] 441 01 261302 14. Sequence of Operation & Diagnostics The following is the normal operating sequence. Cooling (.) Request: 24VAC signals applied to Y & G terminals of FCB (furnace control board) • Cool motor speed is energized after 5 second Cool Fan On Delay time. Y & G signals removed from FCB • Cool motor speed is de-energized after 90 second Cool Fan Off Delay time. Continuous Circulating Fan (G) Request: 24 VAC signal is applied to G terminal of the FCB. • Heat motor speed is energized without delay. G signal removed from FCB. • Heat motor speed is de-energized after 5 second delay. NOTE 1) Furnace de-energizes the fan during the heat exchanger warm-up period on a call for Heating that occurs during a G request unless a blower motor lead is connected to the Cont terminal on the FCB, in which case see NOTE 2). NOTE 2) Heating or Cooling requests received during a Fan request cause the fan speed to change to the appropriate heat or cool speed after the Fan on Delay time expires. The fan returns to continuous circulating speed after the selected Fan Off Delay time expires following loss of the Heating or Cooling request. Continuous Circulating Fan Hard-Wired (Cont) Request: Field selected low speed motor tap installed on "CONT" terminal. • Low speed is energized when power applied to furnace. Operates at this speed continuously while there are no other blower demands from furnace control. Fan demands from furnace control for heat, cool or "G" will override hard-wired speed tap. NOTE 3) EAC is NOT active for hard-wired mode but IS active for fan demands from furnace control for heat, cool and "G". Heating (W) Request: Heating (W) Request: • 24 VAC signal applied to W terminal of FCB. • Inducer motor turns on and the pressure switch(es) close(s). • Following a 15 second prepurge delay after the pressure switches closes, the igniter begins a 17 second warm-up. • The gas valve is energized, the main burners light and flame is sensed. • The igniter is de-energized after the main burners ignite. • FCB will delay blower operation for the 30 seconds timed from the opening of the gas valve. W signal removed from FCB. • The gas valve de-energizes and the main burners go out. • The inducer runs for a 15 second postpurge period. • The fan stays at Heat speed. • The fan de-energizes after the selected Heat Fan Off Delay time expires, timed from the gas valve de-energizing. HUMIDI FIE R -The 24V HUM is energized when the pressure switch closes on a call for heat. The 115V HUM (called HUM on Control) is energized when the inducer is energized. ELECTRONIC AIR CLEAN E R -EAC is energized when there is a blower speed call. It is NOT energized when blower operates in the hard-wired continuous fan mode. NOTE 4) If a new Heating request arrives while the control is waiting in the Heat Fan Off Delay time, the FCB will wait for the selected Heat Fan Off Delay then start a new heating cycle as long as the heat call remains. 441 01 2613 02 [_ Heating Request with Gas Shut Off: 24 VAC signal applied to W terminal of FCB. The FCB will attempt 4 cycles for ignition then go to soft lockout for 3 hours then try for ignition again as long as the heat call remains. Power reset will clear lockout. • Inducer motor turns on • Following a 15 second prepurge delay, the igniter begins warm up. • The igniter glows red-hot for 22 seconds, then turns off. The FCB flashes error code 6. • The igniter stays off for 17 seconds, then begins to warm up again. • The igniter glows red hot for 22 seconds then turns off. The FCB continues flashing error code 6. • The igniter stays off for 17 seconds, then begins to warm up again. • The igniter glows red hot for 22 seconds then turns off. The FCB continues flashing error code 6. • The igniter stays off for 17 seconds, then begins to warm up again. • The igniter g...

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