34
BOILER CONTROL: OPERATION
8. BOILER CONTROL: OPERATION
A. IGNITION SEQUENCE
Figure 8.1 shows the ignition sequence for the
P
ure
F
ire
®
boiler control. Table 8.1 describes each step in the
sequence in detail. The
P
ure
F
ire
®
boiler control provides
dual sensing of the flame to maximize the reliability.
The control senses the burner flame with both the flame
sensor and the ignition electrode.
Figure 8.1: Ignition Cycle – Graphical Representation
Off
Stat
e
Off
On
Off
On
On
On
Off
On
Ignition
Low
Off
Pump
Gas Valve
Ignitor
Flame Signal
Pre-Purg
e
Standb
y
Fan
Igntion Cycle
Demand
Pre-Ignition
Ignitio
n
Circulator Post
Purg
e
Safety On/Off
Post Purge
1
Post Purge
2
Burner On
Off
High
2 second
s
4 second
s
2 second
s
Maximum 24 hours
30 seconds
minimu
m
Depends on
boiler settings
320 milliseconds
5 second
s
10 seconds
maximum
Table 8.1: Ignition Sequence
Period
Demand Status
Burner LCD Display
Standby
No demand is present
If the power is on to the
P
ure
F
ire
®
boiler and there is no heat demand, the burner LCD will display “Standby” and show the
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.
Pre Purge
A CH or DWH demand must be present to initiate ignition.
Once initiated the boiler will light.
When a demand is present, the
P
ure
F
ire
®
control starts the combustion air fan. The fan speed then increases to ignition speed
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.
Содержание PUREFIRE PFC-1000
Страница 1: ...PUREFIRE Boilers PFC 850 PFC 1000 PFC 1500 Gas Installation Operation Maintenance Manual ...
Страница 23: ...21 WATER PIPING CONTROLS Figure 4 4 Recommended Piping One Boiler with Multiple CH Zones One DHW Tank ...
Страница 24: ...22 WATER PIPING CONTROLS Figure 4 5 Recommended Piping Multiple Boilers with Multiple CH Zones One DHW Tank ...
Страница 62: ...60 START UP PROCEDURE J LIGHTING OPERATING INSTRUCTIONS Figure 9 1 Lighting Operating Instructions ...
Страница 80: ...78 REPAIR PARTS Figure 13 3a Jacket Assembly PFC 850 1000 Figure 13 3b Jacket Assembly PFC 1500 ...
Страница 82: ...80 Figure 13 4 Control System REPAIR PARTS ...
Страница 84: ...82 Figure 13 5 Condensate System REPAIR PARTS ...
Страница 89: ...87 APPENDIX B BURNER LCD STATUS SCREENS CH Burn Cycle DHW Burn Cycle Special Functions DHW Tank Warm Hold ...
Страница 90: ...88 APPENDIX C USER MENU APPENDIX C USER MENU Figure C 1 User Menu Managing Burner ...
Страница 91: ...89 APPENDIX C USER MENU Figure C 1 User Menu Dependent Burner ...
Страница 92: ...90 APPENDIX D INSTALLER MENU STRUCTURE APPENDIX D INSTALLER MENU STRUCTURE ...
Страница 93: ...91 APPENDIX D INSTALLER MENU STRUCTURE ...
Страница 95: ...93 SERVICE LOG SERVICE LOG Date Serviced By Description of Service Serial Number ...
Страница 96: ...94 NOTES ...
Страница 97: ...95 NOTES ...