58
APPENDIX A - CONTROL MODULE
2.4 Sequence of Operation
Operational State
Front
Panel
Indica-
tors
User Interface Display
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 sup-
ply temperature to set
point. Boiler proceeds to igni-
tion if supply temperature is
less than set point.
Combustion Air Blower speed
modulates to prepurge setting
for 15 seconds.
Sparking initiated sequence.
Heat
Demand?
DHW CH
Pump on
Supply
Temperature
<Setpoint?
15 Second
Prepurge
Ignition
Sparking
No
Yes
No
Yes
After 2 seconds
Summary of Contents for OLSSC-075
Page 45: ...45 13 TROUBLE SHOOTING...
Page 52: ...52 14 WIRING DIAGRAM 14 1 Connection Diagram...
Page 53: ...53 14 WIRING DIAGRAM 14 2 Schematic Diagram of Ladder Form...
Page 70: ...70 NOTES...
Page 71: ...71 Date Service Performed Company Name Tech Initials Company Address Phone...
Page 72: ...ECR International Inc 2201 Dwyer Avenue Utica NY 13504 4729 web site www ecrinternational com...