Boiler Control: Operation; Ignition Sequence - PEERLESS PUREFIRE PF-850 Installation, Operation & Maintenance Manual

BOILER CONTROL: OPERATION

8. BOILER CONTROL: OPERATION
A. IGNITION SEQUENCE
Figure 8.1 shows the ignition sequence for the P
boiler control. Table 8.1 describes each step in the
sequence in detail. The P
dual sensing of the flame to maximize the reliability. The
control senses the burner flame with both the flame
sensor and the ignition electrode.
Igntion Cycle
Demand
Fan
Pump
Gas Valve
Ignitor
Flame Signal
Figure 8.1: Ignition Cycle – Graphical Representation
Table 8.1: Ignition Sequence
Period
No demand is present
Standby
If the power is on to the P
boiler supply temperature in the lower right corner. The time, in 24 hour format, is shown in the upper right. When a heat demand
(either CH or DHW) is present, the boiler begins the ignition cycle.
A CH or DWH demand must be present to initiate ignition.
Once initiated the boiler will light.
Pre Purge
When a demand is present, the P
and the burner LCD displays the source of the call for heat along with "Trial for ignition." This screen is displayed until the
burner is lit and stable or until a fault occurs. Once the ignition sequence begins it will continue through ignition even if the
demand has ended.
34
F
URE
F ® boiler control provides
URE IRE
Safety On/Off
Maximum 24 hours
320 milliseconds
Demand Status
F ® boiler and there is no heat demand, the burner LCD will display "Standby" and show the
URE IRE
F ® control starts the combustion air fan. The fan speed then increases to ignition speed
URE IRE
®
IRE
Burner LCD Display
On
Off
High
Ignition
Low
Off
On
Off
On
Off
On
Off
On
Off