13
®
8.
The trial for ignition period begins with Terminal 5 and 6 being energized simultaneously. This
is known as PTFI (Pilot Trial for Ignition). The ED510 will display:
PTFI
0:02
IGNITION TIMING
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. When flame is detected during this 10 second period, the
ED510 will display
PTFI 20
FLAME SIGNAL
9.
With flame proven at the end of PTFI, the main flame trial for ignition (MTFI) period begins.
Terminal 7 is energized. The ED510 will display:
MTFI 35
FLAME SIGNAL
Terminal 5 is de-energized 10 seconds later and Terminal 6 is de-energized after another 5 seconds.
10. The firing rate motor is now sent to the auto position (10-11 ckt made) and is under the com-
mand of the proportional controller. The ED510 will display:
AUTO 40
FLAME SIGNAL
NOTE: Trial-for-Ignition timings depend on the programmer selected. The timing chart on page 9
points out the differences in the EP(D)160, EP161, EP165, and EP(D)170.
Normal Shutdown
1.
When the operating control circuit (L1-13) opens, the main fuel valve is de-energized. The fir-
ing rate motor is driven to the low purge position (10-12 ckt made).
2.
Following a 15 second post purge, the burner/blower motor is de-energized.
3.
The burner is now off and the ED510 will display
STANDBY
L1-13 OPEN
Burner history can be displayed by using ED510 keypad. See bulletin ED-5101.
BACKLIT DISPLAY
The ED510 display has a two (2) line by sixteen (16) character backlit LCD display. The backlit
function is energized when power is applied to the FLAME MONITOR.
Contrast Control:
The contrast for the LCD display is factory set. If the contrast must be adjusted
for any reason (e.g.: remote mounting), a potentiometer is provided on the back of the ED510 dis-
play board. Refer to bulletin ED-5101 for detailed information.
FLAME SIGNAL
0-9
10
20-80
NORMAL
MINIMUM ACCEPTABLE
NOT ACCEPTABLE
