AERCO BMK 2.0 LN Dual Fuel Nov 2010 - Manual (Page 32)

CONTROL PANEL OPERATING PROCEDURES
Figure 3-5.
Blower Proof Switch
5. Upon completion of the purge cycle, the
Control Box initiates an ignition cycle and
the following events occur:
(a) The Air/Fuel Valve rotates to the low-
fire ignition position and closes the
ignition switch. The dial on the Air/Fuel
Valve (Figure 3-6) will read between 25
and 35 to indicate that the valve is in
the low-fire position.
(b) The igniter relay is activated and
provides ignition spark.
(c) The Safety Shut-Off Valve (SSOV) is
energized (opened) allowing gas to flow
into the Air/Fuel Valve.
6. Up to 7 seconds will be allowed for ignition
to be detected. The igniter relay will be
turned off one second after flame is
detected.
Figure 3-6.
Air/Fuel Valve In Ignition Position
7. After 2 seconds of continuous flame, Flame
Proven will be displayed and the flame
strength will be indicated. After 5 seconds,
the current date and time will be displayed in
place of the flame strength.
8. With the unit firing properly, it will be
controlled by the temperature controller
circuitry. The boiler’s VALVE POSITION will
be continuously displayed on the front panel
bargraph.
Once the demand for heat has been satisfied,
the Control Box will turn off the SSOV gas valve.
The blower relay will be deactivated and the
Air/Fuel Valve will be closed. Standby will be
displayed.
3-10