AERCO BMK 1.5 LN May 2009 - Manual (Page 29)

CONTROL PANEL OPERATING PROCEDURES
3-9
3.9 START/STOP LEVELS 8. With the unit firing properly, it will be
controlled by the temperature controller
circuitry. The boiler’s FIRE RATE will be
continuously displayed on the front panel
bargraph.
The start and stop levels are the fire rate
percentages that start and stop the unit, based
on load. These levels are Factory preset as
follows:
Start Level: 20% Once the demand for heat has been satisfied,
the Control Box will turn off the dual SSOV gas
valves. The blower relay will be deactivated and
the Air/Fuel Valve will be closed. Standby will
be displayed.
Stop Level: 16%
Normally, these settings should not require
adjustment.
Note that the energy input of the boiler is not
linearly related to the fire rate percentage
(Air/Fuel Valve position). Refer to Table 3-6 on
the following page for the relationship between
the energy input and fire rate percentage for a
unit running on natural gas.
25
DIAL
(DETAIL “A”)
STEPPER
MOTOR
DETAIL “A”
Figure 3-6.
Air/Fuel Valve In Ignition