Sequence Of Operation - Dunkirk DKVLT-050 Installation, Operation & Maintenance Manual

1.4 Sequence of Operation

Operational State
No
Heat
Demand?
Yes
DHW CH
Pump on
No
Supply
Temperature
<Setpoint?
Yes
15 Second
Prepurge
Ignition
Sparking
After 2 seconds
APPENDIX A - CONTROL MODULE
User Interface Display
S t a n d b y : N o D e m a n d
74
Explanation
Boiler operates in standby mode until
demand for Central Heat (CH) or
Domestic Hot Water (DHW) is detected.
CH or DHW pump is turned on based on
type of heating demand.
(CH call is illustrated)
Control Module compares supply
temperature to set point. Boiler proceeds
to ignition if supply temperature is less
than set point.
Combustion Air Blower speed
modulates to pre-purge setting for 15
seconds.
Sparking initiated sequence.
P/N 240011326, Rev. B [04/15/2016]