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K. ADDITIONAL SAFETY FUNCTIONS
1. Ignition Failure Protection: The Series PBC™ control
allows for 3 failed ignition attempts before the control
goes into a lockout state showing Loc 1. This lockout
can be reset by holding the Menu button until “rst”
appears on the display or by pressing the manual
reset button below the control state LED on the main
control board.
2. Flame Failure Protection: The Series PBC™ control
allows monitors for flame failure during a demand. If
the flame signal is lost more than 3 times during a
single demand the control will go into a lockout state
showing Loc 22. This lockout can be reset by holding
the Menu button until “rst” appears on the display or
by pressing the manual reset button below the control
state LED on the main control board.
3. Flue Temperature Protection: Series PBC™ control
monitors the flue temperature sensor for high
temperatures. If the flue temperature approaches
190°F (88°C), the boiler will begin to modulate input
down regardless of setpoint or demand. If the flue
temperature reaches 190°F (89°C) the boiler will shut
down and run the blower for 5 minutes before re-
ignition.
4. Flame Recovery: The Series PBC™ control actively
monitors the ionization current though the flame
sensor. If Flame Signal drops to below 1.5 µA, the
control will increase the minimum fan speed in order
to attempt to maintain flame signal. If this fails, the
control will retry with a further increased minimum fan
speed. If a second flame loss occurs, the control will
retry again at ignition fan speed as the minimum. If at
any point the demand is met the control will reset the
minimum fan speed to default.
5. Stayburn and Startburn Temperatures: When the
supply temperature of the boiler exceeds the maximum
boiler setpoint due to the off hysteresis of 9°F and a
demand is still present, the Series PBC™ control
allows the unit to run at 1% input until the Stayburn
temperature is reached at 190°F (88°F). The boiler will
always shutdown at this temperature and will never
exceed it. The Series PBC™ is not designed to run
beyond this temperature. Steps should be taken to
improve the system to lower the required setpoint if
the Stayburn Temperature is ever reached. The boiler
will not re-ignite until the Startburn temperature is
reached below the setpoint. The Startburn
Temperature is 185°F (85°C).
6. Frost Protection: The Series PBC™ control monitors
the unit for potential freeze situation which would
cause damage to the internal piping of the unit. If the
water temperature inside the unit falls below 41°F
(5°C) the boiler pump will start. If the temperature
continues to fall the burner will ignite to and heat the
unit until the supply temperature reaches 59°F (15°C).
7. Filling Protection: The Series PBC™ control monitors
the system pressure for drops below the required
system pressure of 11.6psig. Pressures below 17.5 psig
will cause the pressure display on the unit to flash as a
warning. Pressures below 10.15 psig will cause the
boiler to shut down and display a “FILL” error. The
unit will not run until the pressure is again above the
minimum pressure
8. De-air: Upon boiler power initiation, the Series PBC™
control will enter a de-air state during which it will
purge any air remaining in the system by cycling the
pump on and off and changing the position of the
switching valve. This period lasts for 4 minutes. It can
be canceled by holding buttons L2 and R2 for 3
seconds simultaneously.
9. Low Water Cut Off: The Series PBC™ control comes
equipped with a probe style LWCO function built into
the control. With the addition of the optional LWCO
probe kit installed in the piping above the boiler, the
control will monitor for low water conditions. If such a
condition occurs the control will go into a lockout
state and must be manually reset.
10. Flue Pressure and Block Condensate Switch: The
Series PBC™ control monitors a pressure switch that
will enter the boiler into a blocking state. This switch
will display Err 156. Clearing of the flue or
condensate line will automatically clear this error.
BOILER CONTROL: INTERNAL WIRING & OPERATION
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