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13
AST 14 C 152/00
CHP.3
CHARACTERISTICS AND TECHNICAL DATA
3.1 CONSTRUCTION CHARACTERISTICS
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Mono-thermal, high output, copper heat exchanger.
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DHW Stainless steel plate heat exchanger.
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Vertical stratification 25 litre water tank with magnesium anode.
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Three-speed CH circulation pump equipped with air-purging device.
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DHW circulator.
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Motorized cut-off valve.
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8 litre CH expansion vessel for BTFS 24 model and 10 litre for BTFS 28 and BTFS 32 models.
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2 litre DHW expansion vessel.
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Low water pressure switch.
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DHW priority flow switch.
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DHW flow limiting device (8 l/min – 24Kw, 10 l/min – 28Kw, 12 l/min – 32Kw).
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Adjustable by-pass.
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CH sy stem loading and draining taps.
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CH water, DHW and water tank temperature probes.
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Safety limit thermostat.
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IP44 electrically protected control panel.
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Electronic safety board and integrated modulation.
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Electronic ignition with separate transformer.
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Flue gas pressure switch.
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Gas valve with double shutter.
3.2 OPERATING CHARACTERISTICS
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DHW priority function.
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CH mode electronic flame modulation, timer controlled flame rising ramp (50 seconds).
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DHW mode electronic flame modulation.
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Boiler and storage tank anti-freezing function.
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Maximum heat input adjusting trimmer.
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Ignition heat input adjusting trimmer.
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Timer-controlled “chimney sweep” function (15 minutes).
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Ignition flame propagation function.
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Timer-controlled room thermostat (240 seconds when CH flow temperature >40°C).
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CH pump post-circulation function in boiler winter mode (180 seconds).
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CH pump post-circulation function after DHW production, in boiler winter mode only (6 seconds).
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DHW post-ventilation function in boiler summer mode only (6 seconds - CTFS).
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Post-ventilation safety function (ON: 95°C; OFF: 90°C - CTFS).
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Anti-blocking function for DHW pump and deviating valve (6 seconds of pump operation every 24
hours of boiler inactivity).
