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44
AST 14 C 257/00
SECTION 5
OPERATING LOGIC
5.1 MAIN GENERAL CHARACTERISTICS
Function
priority
Boiler
configuration
Ignition phase at pre-set output
Flame propagation at the pre-set output
Automatic flame control
DHW
control
DHW plate system modulation
Tank heater DHW modulation
Heating control
Ambient thermostat timer (anti-fast)
Maximum adjustable boiler output
Temperature range pre-selection
Heating modulation with output ascent ramp
Thermoregulation with external probe
Provision for Open Therm remote control
Programmable multifunction relay
Provision for additional board connection
Temperature probe check
Brushless fan check
Flow anti-freeze function
Plate DWH anti-freeze function
Anti-shutdown
function
Pump post-circulation function
Post-ventilation
function
Anti-legionella
function
Safety devices and functions
FUNCTION PRIORITY
The table below shows the priorities in activating the main functions in the presence of a
contemporary request for two or more functions.
Priority
Status
1
Shutdown status (pump-only anti-freeze and anti-shutdown functions only)
2 Chimney-sweep
3
Tank heater anti-legionella function (KR only)
4
DHW request
5
DHW anti-freeze
6
Heating request in both DHW+CH modes
7
Heating anti-freeze in both DHW+CH and DHW modes
8
Post-circulation
9
Pump and diverting valve anti-shutdown
10
Waiting for a request