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2. Technical Characteristics and Dimensions
2.1. Technical Characteristics
The boiler is equipped with an integrated gas atmospheric burner and the following versions are available:
- CTN 24 AF: open chamber, natural draught boiler with electronic ignition and instantaneous DHW supply;
- CTFS 24 AF: sealed chamber, forced draught boiler with electronic ignition and instantaneous DHW supply;
Both models are equipped with ionization flame detection device.
The boilers meet applicable requirements of laws enforced in the country of destination and shown in their data plate
Installation in a country other than specified might be source of hazard to people, animals and objects.
The principal technical characteristics of the boilers are listed below:
Construction Characteristics
- Bi-thermal, high performance, copper heat exchanger.
- CH pump with integrated air purging device.
- 6-litre expansion vessel.
- Safety pressure switch, preventing low water pressure operation.
- DHW priority flow switch.
- 10 liter/min DHW flow limiting device.
- Boiler loading and unloading taps.
- DHW and CH temperature probes.
- Safety limit thermostat.
- IPX4D electrically protected control panel.
- Integrated safety and modulation electronic board.
- Electronic ignition and ionization flame detection device.
- Air/flue gas pressure switch (CTFS).
- Flue gas thermostat (CTN).
- Twin shutter, modulating gas valve.
User Interface
- Central heating selector/adjusting knob (35°C/78°C range).
- Boiler shutdown reset/DHW adjusting knob ( 35°C/58°C range).
- System water pressure gauge.
- Light emitting indicators for:
• Power ON;
• CH supply;
• flame detection;
• burner shut-down;
• gas valve alarm;
• burner shut-down due to overheating;
• burner shut-down due to air/flue gas pressure switch intervention (CTFS);
• burner shut-down due to faulty chimney draught (CTN);
• insufficient water pressure in the system;
• malfunction of temperature probes.
Functional characteristics
- DHW priority function.
- Electronic flame modulation in CH mode, with timed rising ramp.
- Electronic flame modulation in DHW mode.
- Boiler anti-frost function (ON: 5°C, OFF: 30°C or after 15 minutes operation).
- Flame propagation function during ignition procedure (CTFS).
- Timer controlled ambient thermostat (240 seconds with CH flow temperature > 40°C).
- Post-circulation function of pump in CH and anti-frost modes (30 seconds).
- Post-circulation function of pump in DHW (6 seconds in winter mode, 1 second in summer mode).
- Post-ventilation function in DHW mode and only when boiler is set to summer (10 seconds – CTFS).
- Post ventilation safety function after boiler shutdown of malfunction of probes (1 minute – CTFS).
- Pump anti-blocking function (30 seconds of pump operation each 24 hours of boiler inactivity).
