York International DFAA User's Information, Maintenance And Service Manual

York International DFAA User's Information, Maintenance And Service Manual Manual pdf 9 page image

107273-UUM-C-0306Unitary Products Group 98. BURNER MOTOR-OFF DELAY (Postpurge) - If applicable, thefuel valve is de-energized and the burner motor is kept on for theselected postpurge time before the control returns to standby.START UP AND SAFETY CHECK PROCEDUREBurner Start-up1. Open hand valve in oil supply line.2. Make sure system is powered. Check circuit breaker or fuse andclose system switch located on the right side of the control box.3. Set thermostat to call for heat.4. Make sure burner lights and operates until call for heat ends.5. Verify that burner turns off when thermostat call for heat is satis-fied.Safe Start:1. Place a jumper across cad cell terminals2. Follow burner start-up. Burner must not start, indicator light turnson and control remains in Idle Mode.3. If burner starts, replace control.Simulate Flame Failure:1. Follow burner start-up.2. Close hand valve in oil supply line.3. Device enters recycle mode.4. Device tries to restart system after approximately 60 seconds.5. Safety switch locks out approximately in the selected time indi-cated on label. Indicator light flashes 1/2 second on, 1/2 secondoff. Ignition and motor stop and oil valve closes.Lockout ModeThe R7184 Primary Control will enter the lockout mode when:• Flame is detected during valve-on delay.• When flame is not established during Trial for Ignition.• When flame is lost three times in one call for heat.• When flame is detected during burner motor-off delay period.Diagnostic LEDThe diagnostic LED has four states:• On - Flame present.• Off - No Flame.• Two seconds on, two seconds off - Recycle.• 1/2 second on, 1/2 second off - Lockout.Cad Cell ResistanceCad cell resistance can be checked without using an ohmmeter. Duringthe run mode, press and release the reset button. The resulting flashesindicate the resistance. See Table 4.Valve-on Delays / Blower Motor-off DelaysSelect models may have fixed or selective delays for valve open orblower motor off. The safety circuits will check for flame during thesedelays and, if a flame is present, will switch the control to lockout.Simulate Ignition Failure:1. Follow burner start-up, but do not open oil supply hand valve.2. Observe that safety switch locks out approximately within theselected time as indicated on the label. Indicator light flashes 1/2second on, 1/2 second off. Ignition and motor stop and oil valvecloses.TROUBLESHOOTING AND MAINTENANCEIMPORTANT: Due to the potential hazard of line voltage, only a trained,experienced service technician should perform the troubleshooting pro-cedures.IMPORTANT: This control contains no field-serviceable parts. Do notattempt to take it apart. Replace entire control if operation is not asdescribed.To completely troubleshoot an oil burner installation, check the burnerand oil primary control for proper operation and condition.The indicator light on the oil primary control provides lockout, recycleand cad cell indications as follows:1. Flashing at 1/2 second on, 1/2 second off: system is locked out orin restricted mode.2. Flashing at 2 seconds on, 2 seconds off: control is in recyclemode.3. On: cad cell is sensing flame.4. Off: cad cell is not sensing flame.Cad Cell Resistance CheckFor proper operation, it is important that the cad cell resistance is below1600 ohms. During a normal call for heat, once the control has enteredthe run mode, press and release the reset button. See Table 4 forequivalent cad cell resistance and Figure 12 for an example of the cadcell resistance reading.Fire or Explosion Hazard - Can cause severe injury, death orproperty damage. Make sure the combustion chamber is freeof oil and/or oil vapor before starting system.FIGURE 11: Interrupted Electronic Oil Primary ControlDIRECT SPARK IGNITION SYSTEMDo not attempt to light this furnace by hand (with a match orany other means). There may be a potential shock hazard fromthe components of the Ignition Transformer. The furnace canonly be lit automatically by its direct spark ignition system.servicing.120 VAC 60 HZLOCKOUT TIMING: 15 SECONDSDisconnect power beforeCan cause injury or death!Electrical shock hazard!*REDUCE BURNER MOTOR FLA RATING BY IGNITOR LOADWARNINGMay be replaced by R7184A1000Interrupted Ignition Oil Primary ControlR7184 X XXXXXFire hazard!fuel oil, press red buttonTo prevent fire or spillingCan cause severe burns!burner does not light.IGNITORVALVEMOTORBURNERClocal service company ifonly once to reset. Call32005456-002 REV. ARATINGS360 VA1 AMP60 LRA10 FLA*USCONTACTSALARMLOADSTAT2 AMP30 VAC0.1 AMP24 VAC(WIRINGDIAGRAM)Honeywellby(1/2 SEC. ON) = LOCKOUT(2 SEC. ON) = RECYCLEPUSH RED BUTTON TOFLASHINGOFF = NO FLAMEON=FLAMEDIAGNOSTIC LIGHTALARM CONTACTSBURNER MOTOR OFF DELAY TIME: DELAY TIMES:VALVE ON DELAY TIME: 15 SEC. (FIXED)0 MIN 2 MIN 4 MIN 6 MINRESET FROM LOCKOUTMINNEAPOLIS, MN 55422FOR T-STATCUT JUMPERTTENVIRACOMENVIRACOM