Assessments - 2, GPA: 4 ( )

Fabricante : Sears Arquivo Tamanho: 3.24 mb Arquivo Nome : Língua de Ensino:

ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD Failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or property damage. Improper servicing could result in dangerous operation, serious injury, death or property damage. • Before servicing, disconnect all electrical powerto furnace. • When servicing controls, label all wires prior to disconnecting. Reconnect wires correctly. • Verify proper operation after servicing. See "User's Information Manual" and the "Service Manual". [_ 440 01 1020 04 10. Sequence of Operation & Diagnostics The following is the normal operating sequence for the control system. Cooling (.) Request: 24 VAC signals applied to Y & G terminals of EFT (electronic fan timer) control. • Cool motor speed energized after 5 second Cool Fan On Delay time. Y & G signals removed from EFT. • Cool motor speed de-energized after 90 second Cool Fan Off Delay time. Circulating Fan (G) Request: 24 VAC signals applied to G terminals of EFT control. • Heat motor speed energized without delay. G signal removed from EFT. • Heat motor speed de-energized without delay. Heating (W) Request: 24 VAC signals applied to W terminal of EFT control. • Inducer motor turns on. • The gas valve solenoid energizes. • Following a 3 second prepurge delay, the pilot valve opens and the ignitor begins to warm up. • After the pilot lights, the main burners energize and light. • Timed from the opening of the main gas valve, the control will delay 30 seconds before switching the fan to Heat speed. W signal removed from EFT. • The gas valve de-energizes and the main burners go out. • The inducer runs at its present speed for a 30 second postpurge period. • Timed from the gas valve de-energizing, the Heat fan speed de-energizes after the selected Heat Fan Delay time expires. Heating Request with Gas Supply Line Shut Off: 24 VAC signals applied to W terminal of EFT control. • Inducer motor turns on. • The gas valve solenoid energizes. • Following a 3 second prepurge delay, the pilot valve opens and the ignitor begins to warm up. • The ignitor glows red-hot for 30 seconds, then turns off. • The igniter stays off for 25 seconds, then begins to warm-up again. • The igniter glows red-hot for 30 seconds, then turns off. • The pilot valve closes 3 seconds after the igniter de-energizes. • The inducer de-energizes 5 seconds after the pilot valve closes. • The SmartValve proceeds to soft lockout and flashes error code 6. • The control exits soft lockout after 5 minutes and begins another ignition sequence. 44001 102004 [_ Gas Valve Diagnostic Codes (See Figure 44) OFF = Control not powered Heartbeat = Normal Operation (Standby or call for heat) 1 Flash = Not used 2 Flashes = Pressure switch closed when should be open 3 Flashes = Pressure switch circuit was still sensed as open 30 seconds after the inducer was energized. System is in 5 minute delay mode, with inducer off. After 5-minute delay, a new ignition sequence will be initiated. (Note: SV9541M On/Off switch in off position during a call for heat will generate this diagnostic code) 4 Flashes = Limit switch string open 5 Flashes = Flame sensed out of sequence -Flame signal still present. 6 Flashes + 1 Note 1 = Soft Lockout -Maximum retry count exceeded (failed to light within 4 trials for ignition) 6 Flashes + 2 Notes 1,2 = Soft Lockout -Maximum recycle count exceeded -Last failure was Flame Sense Lost During Run 6 Flashes + 3 Notes 1,2 = Soft Lockout -Maximum recycle count exceeded -Last failure was Airflow Proving Circuit Opened During Run 6 Flashes + 4 Notes 1,2 = Soft Lockout -Maximum recycle count exceeded -Last failure was Limit Circuit Opened During Run 7 Flashes = Soft Lockout Due to Limit Trips Taking Longer than 2 minutes to Reset; Auto Reset After 1 Hour if Call for Heat Still Present. Reset by Cycling Call for Heat at Any Time. NOTE 1 : The 6 + X designation indicates a combination of flash codes: 6 flashes shows the control is in soft lockout, followed by X flashes to indicate the reason the control went into soft lockout. When the 6+ X code is flashing, the SV9541 will attempt a new ignition sequence after a five minute delay period, if the call for heat is still present. Reset of the thermostat will initiate a new ignition sequence immediately. NOTE 2: Any combination of 5 'abnormal' events during a single call for heat will result in soft lockout. An 'abnormal' event is a Flame Sense Failure During Run, Airflow Proving Circuit Open During Run, or Limit Circuit Open During Run. The flash code will indicate which was the last 'abnormal' event that put the system into the soft lockout state based on the table above. Typical Gas Valve Honeywell OUTLET PilotPressure A_ustment(Hidden) On\Off INLET Manifold Pressure Adjustment Diagnostic Light dwg 25-23-31a [_ 440 01 1020 04 HONEYWELL SV9541M "SMART VALVE" Sequence of Operation I POWERAPPLIEDTO APPUANCE l I THERMOSTAT CALLS FOR HEAT I . I PRESSURESWITCHESPROVEDOPEN? WAITFOR PRESSURESWIT...

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