ProFire PF2100 - Page 35

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SYSTEM
STATE
READY
PURGE IGNITE
FLAME
MAINPILOT DELAY SHUTDOWN
TIMER
2s
0s
4-20 PRESSURE
20mA
4mA
EVENT
31 2
4-20 PRESSURE INPUT
PRESSURE LOW SP
PRESSURE HIGH SP
# CHART 2 EVENTS
1 System started by user with pressure above high setpoint.
2 Main turns on and timer starts counting down 2s.
3 The timer expires and the pressure signal does not drop below the high setpoint. The system shuts down.
Chart 3: Pressure High On Start But Clears When Main Opens
SYSTEM
STATE
READY
PURGE IGNITE
FLAME
MAINPILOT DELAY
TIMER
2s
0s
4-20 PRESSURE
20mA
4mA
4-20 PRESSURE INPUT
2 31
EVENT
PRESSURE LOW SP
PRESSURE HIGH SP
# CHART 3 EVENTS
1 System started by user with pressure above high setpoint due to a slow leak in the regulator. Pressure begins to
drop slowly through pilot valve.
2 Main valve opens and pressure begins to drop faster through main valves.
3 The pressure drops below the high setpoint within 2s of the main valves opening and the system continues
running.
Chart 4: Auto Restart = Enabled
TIMER
MAX
0s
4-20 PRESSURE
20mA
4mA
4-20 PRESSURE INPUT
SYSTEM
STATE
RUNNINGRUNNING WAITING ON PRESSURE
3 6521 4
EVENT
PRESSURE LOW SP
PRESSURE HIGH SP
# CHART 4 EVENTS
1 System already running with pressure between High and Low setpoints.
2 Hand valve on fuel train closed. Pressure begins to drop.
3 Pressure falls below the low set point. Delay timer starts counting down. (max valve depends on the Level/
Pressure Delay setting)
4 Delay timer expires and burner turns off. System state is now “Waiting on Pressure.”
5 Hand valve is opened and pressure increases quickly.
6 Pressure rises above low setpoint and system begins running again.
Chart 5: Level Event Restart = Disabled