Riello Array AR 800 - APPENDIX L - FLOWCHARTS

65
SHUTDOWN
65
APPENDIX
APPENDIX
APPENDIX L - FLOWCHARTS
SINGLE MODULE
Module in
Stand-by
Stop pump
Start pump
Start fan
Blocking
error
Post burn
Burner off,
Post pump
Start burner (*)
Burn: Based on delta of Supply sensor
and Setpoint PID output is determined
*
Demand for
module
Supply
Temp
lower than
Setpoint
Module
CH flow
is above
min_flow?
Demand
Still active?
Post Pump
timer finished
or no longer
priority
Is the supply
Temp Above the
module setpoint
+ Hyst Up?
Is the supply
Temp Above the
module setpoint
+ Hyst Up?
Is Delta between
supply and return
larger than max
delta?
Is Delta between
supply and return
larger than max
delta?
Post pump
ready
NO
NO
NO
YES
YES
YES
YES
NO
YES
NO
BURN
NO
YES
YES
NO
NO
NO
NO
YES
YES
(*) see Burner ignition sequence on next page.