TM 5-3895-374-24-2 OPERATION Refer to the wiring suggestions shown in Bulletin E- 1001 before proceeding to power the FLAME-MONITOR System. Items such as  scanner  installation,  short  circuit tests and safety information should be reviewed. Note    that    for    direct    spark    ignited    oil    burners, substitute the words "main oil valve" for "pilot valve". Start-up (Normal Cycle) 1. Constant  120V.A.C.    should  be  available  to  the L1-L2 terminals on the wiring base. 2. The  operating  control  circuits  (L1  -13)will  close, signaling the burner to start its firing sequence. 3. Assuming   the   fuel   valve   end   switch   (13-3)   is closed,   the   burner/blower   motor   (terminal   M) circuit is energized.  The running interlock (limit) circuit (3-P) will close. 4. The  firing  rate  motor  is  driven  toward  the  high purge open damper position (10-X ckt.  made). 5. The pre-purge starts counting 30 seconds. 6. When   pre-purge   is   completed,   the   firing   rate motor  is  driven   toward   the   low   purge   damper position (10-12 ckt.  made). 7. Following a 30 second delay (to permit the firing rate  motor  to  move  to  the  low  fire  position),  the control  will  wait  for  the  low  fire  switch  (M-D)  to make.    When  it  is   made,   the   trial   for   ignition sequence will start.  If after ten minutes the M-D circuit is not made, the control will lockout. Note:  When  flame  is  detected,  the  message  center will    provide    a    constant    readout    of    the    signal strength. Flame Signal 0-9 Not Acceptable 10 Minimum Acceptable 20-80 Normal Normal Shutdown 1. When     the     operating     control     circuit     (L1-13) opens, the main fuel valve is de-energized.  The firing   rate   motor   is   driven   to   the   low   purge position. 2. Following a 15 second post purge, the burner/blower motor is de-energized. 3. The  burner  is  now  off  and  the  message  center displays   the   burner   operating   history   for   two minutes or until another cycle begins. 8. The trial for ignition period begins with Terminals 5 and 6 being energized simultaneously.  This is known   as   PTFI   (Pilot   Trial   for   Ignition).      This period  is  ten  seconds  in  duration.  If  no  flame  is detected  after  ten  seconds,  the  control  will  de- energize   Terminals   5   and   6,   and   lockout.      If flame  is  detected  during  this  10  second  period, the main trial for ignition sequence will start. Note:  On  EP270,  PTFI  on  Terminal  5 is  5  sec.    MTFI  on  Terminal  6  is  10 sec.  (30 sec.  on EP261) Note Charts above. 9. With flame proven at the end of PTFI, the  main trial for ignition (MTFI) period begins.  Terminal 7 is   energized.      Terminal   5   is   de-energized   10 seconds   later   and   Terminal   6   is   de-energized after another 5 seconds.  (Note the charts above for   exceptions   to   MTFI   timing   on   EP261   and EP270). 10. modulator motor is now sent to the auto position and   is   under   the   control   of   the   proportional controller.        The    message    center    displays    a constant read-out of the flame signal. Safety Shutdown (Lockout) The system will lockout for a number of reasons.  These are described in the following pages of charts. Whenever     a     lockout     occurs,     the     message     center displays  the  reason  for  the  shutdown  and  the  recycle  is possible  only  when  the  reset  button  is  depressed  and released.    The  non-volatile  memory  will  remember  the status of the control even if a power failure occurs. Important: On initial power-up  and  on  restarts  following power failure, the display will scroll a history message for 15  sec.  when  using  a  programmer  having  a  date  code followed by a number greater than "11".  (i.e.  date code 8740-12) (page 3 - 1069)