NEW BAXI BRANDED WALL HUNG GAS BOILERS Easiness and flexibility for the maximum comfort

Range of models ECO3 240 i ECO3 240 i Open flue – 24 kW of heat output 13,7 litres of DHW per minute (ΔT 25°C) ECO3 240 Fi Fanned flue – 24 kW of heat output 13,7 litres of DHW per minute (ΔT 25°C) ECO3 280 Fi ECO3 280 Fi Fanned flue – 28 kW of heat output 16 litres of DHW per minute (ΔT 25°C)

 Easy and clear LCD display  Reliability and easiness of use Distinctiveness

ECO3 is provided with innovative LCD display: all working parameters and in case the anomalies are displayed through easy and clear symbols and codes LCD display

A careful choice of all ECO3 components ensures high reliability and quality. The easy frontal access to the components makes the maintenance very simple. Reliability and easiness of use summer-winter-reset selector LCD display Heating temperature Adjusting control DHW temperature Adjusting control

Reliability and easiness of use

Two separate heat exchangers: primary exchanger made of copper pipes, covered with aluminium-silicon paint to increase its heat resistance. Stainless steel plates exchanger for DHW production.  New hydraulic group with integrated electric three way valve (combination models), automatic by-pass, pump with automatic air vent, filling tap and relief valve.  Complete diagnostic system through LCD display.  Temperature control with two NTC sensors.  Pump post-circulation.  Pump and electric three way valve anti-sticking system.  Anti-frost protection under 5°C on both central heating and DHW circuits.  Climatic regulation (external sensor) available as optional.  Two ranges of Central Heating temperature (30-85°C and 30-45°C). General features

A broad views LCD display: clear and prompt information CH operation Burner lighted Gas problems DHW operation CH water temperature CH-DHW set temperature Anomaly codes Anomaly general warning Need of reset Lack of water

Safety device indicators - activation If a fault occurs, the display reads out an error message identifying it (es. E 10): To RESET the gas boiler, turn selector (Figure 2) to “R” for at least 2 seconds. If the fault persists, call an authorised service centre. Note: It is possible to carry out n° 5 relighting attempts in a row, after which the RESET function is disabled and the gas boiler still blocked. To carry out a new RESET attempt, turn the selector (figure 2) in OFF position for at least 2 seconds. Resetting errors

Safety device indicators - activation

DISPLAY –“INFO” mode IMPORTANT : the following operations, it has to be carried out in fast sequence in a short time (~ 4 seconds) without making any break during the steps: 1) with the control knob ( ) in any position turns it fully anti-clockwise to the minimum value; 2) quickly turn control knob clockwise through about a 1/4 turn; 3) again turns the control knob fully anti-clockwise to it minimum value 4) then set back the control knob to it original position. Note: In “INFO” mode, the display alternates between the message “A00” and CH temperature

DISPLAY –“INFO” mode Turn the control knob to display the following information: A00 Real DHW temperature A01 Real external temperature A02 Modulating current % (with N.G. = mA dc; with LPG = mA dc) A03 Boiler Output % A04 CH set-point temperature A05 Real CH temperature A07 Flame signal % (the ionisation signal normally is more than 2 micro A) Note: program lines from A06 - A08 - A09 are not used. “INFO” function remains active for 3 minutes. To exit “INFO” function before this time repeat the operation as described in points or cutting OFF the power supply to the boiler.

Control and operation devices

Overheat safety thermostat : 105°C Flue thermostat:70°C NTC SENSOR HONEYWELL SO11001 Control and operation devices

P.C.B. BERTELLI (not polarized) MET operation of the boiler with NATURAL gas T.Risc boiler heating temperature range °C T-off 150-seconds heating stand-by time GPL operation of the boiler with LPG T.Risc boiler heating temperature range °C T-off30-seconds heating stand-by time CN7

The boiler has 2 NTC sensors: - one for Central Heating Circuit - one for DHW circuit Sensors are interchangeable. In case of failure of the DHW sensor, the boiler operates only in Central Heating. Working Range Temperature (°C) Resistance (Ohm) 1. Sensor Body 2. Electrical Connection Beta = 3435 TemperatureResistance (±1%) 0 °C Ohm 25 °C Ohm 45 °C 4913 Ohm 90 °C 1266 Ohm NTC Sensors

P.C.B. 240 i

P.C.B. 240 Fi

 Entirely made of brass, to assure reliability and long life.  DHW stainless steel plates exchanger: its high exchange power is a guarantee of great comfort: up to 13,7 litre per minute at steady temperature.  Electric three way valve: full anti- frost protection of the boiler’s circuits.  New generation of “Low Energy” Grundfos pump (55 W): more than 25% of power consumption cutting.  Built-in automatic by-pass to avoid boiler overheating in case of flow reduction in the heating system. New compact hydraulic group

New Heat exchanger “VALMEX” - 24 Kw - Safety thermostat: 105°C

GAS VALVE for open flue and fanned flue SIT SIGMA Burner gas pressure Inlet gas pressure MODULATOR ELECTRIC FEATURES : - Modulating Coil Ohmic Resistance: 20 Ohm (T=25°C) - Voltage to the Modulator:max 4,5 V dc (N.G.) max 7 V dc (LPG) -Electric Current with Natural Gas: mA dc - Electric Current with L.P.G.: mA dc COILS ELECTRIC SUPPLY: 230 V ac (Electric coils connected in parallel) Max.supply gas pressure: 60 mbar P. min P. max Code:

Gas valve adjustments Adjustment of Nominal Output (P.max)  Connect the positive pressure intake of a differential manometer to the gas valve pressure intake (Pb).  Connect the negative pressure intake of the manometer to a “T” fitting in order to join the boiler compensation intake, the gas valve compensation intake (Pc) and the manometer. (The same measurement can be carried out by connecting the manometer to the pressure intake Pb after removing the sealed chamber front panel).  Open the gas tap and rotate the selector knob to Winter position.  Open a hot water tap at a minimum flow rate of 10 l/min or ensure that maximum heating demand is set;  Remove the modulator plastic cover and adjust the brass screw nut to obtain the pressure value as specified in the instruction manual of the boiler.  Check that the dynamic pressure measured at the pressure intake (Pa) is correct.

Adjustment of the reduced output (P.min)  Disconnect a modulator wire and adjust the red screw to reach the pressure value as specified in the instruction manual if the boiler.  Connect the cable again.  Fit the modulator cover and seal its fixing screw. Gas valve adjustments

HONEYWELL VK 4105 M P. min P. max Inlet gas pressure Burner gas pressure MODULATOR ELECTRIC FEATURES : - Modulating Coil Ohmic Resistance:40 Ohm (T=25°C) - Voltage to the Modulator:max 9 V dc (N.G.) max 13 V dc (LPG) - Electric Current with Natural Gas: mA dc - Electric Current with L.P.G.: mA dc MODULATOR ELECTRIC FEATURES : - Modulating Coil Ohmic Resistance:40 Ohm (T=25°C) - Voltage to the Modulator:max 9 V dc (N.G.) max 13 V dc (LPG) - Electric Current with Natural Gas: mA dc - Electric Current with L.P.G.: mA dc GAS VALVE ELECTRIC SUPPLY: 230 Vrac (rectified) (Electric coils connected in parallel) Max.supply gas pressure: 60 mbar Code: GAS VALVE for open flue and fanned flue

HONEYWELL VK 4105 M This valve is alternative to Sit Sigma Valves interchangeable and same adjustment system. Plastic cap Modulator’s wires Maximum output adjusting nut Reduced output adjusting nut

Gas valve adjustments Adjustment of Nominal Output (P.max)  Connect the positive pressure intake of a differential manometer to the gas valve pressure intake (Pb).  Connect the negative pressure intake of the manometer to a “T” fitting in order to join the boiler compensation intake, the gas valve compensation intake (Pc) and the manometer. (The same measurement can be carried out by connecting the manometer to the pressure intake Pb after removing the sealed chamber front panel).  Open the gas tap and rotate the selector knob to Winter position.  Open a hot water tap at a minimum flow rate of 10 l/min or ensure that maximum heating demand is set;  Remove the modulator plastic cover and adjust the brass screw nut to obtain the pressure value as specified in the instruction manual of the boiler.  Check that the dynamic pressure measured at the pressure intake (Pa) is correct.

Gas valve adjustments

Gas valve and connector GAS VALVE SIT GAS VALVE HONEYWELL Connector: ANSTOSS mod. VZ2/10 SAC Connector: ANSTOSS mod. VZ2/10 HDC

More comfort Higher efficiency Lower consumption Main advantages of a climatic regulation  Central Heating water temperature is adjusted according to the real outdoor temperature;  In case of sudden change of weather, this regulation is able to react quicker than a boiler controlled only by the room thermostat;  More cost-effective heating: the water entering the system has the lowest temperature necessary under the given conditions, reducing heat losses in the piping. IMPORTANT: the TM delivery temperature value depends on the position of the jumper or the switch T.RISC. The maximum possible temperature setting is 85 or 45°C.

Connection of the external probe

Solutions for every demand of heating  The boiler’s PCB can easily be set for the operation of the boiler in traditional heating systems 80/60°C (radiators) or in low temperature systems 45/30°C (under-floor heating systems).  In case of mixed heating systems (high and low temperature), a special controller is available as optional (code KFG ). This appliance is only 160 mm deep and it can be installed both built-in and wall hung. It includes: - pump for the high temperature zone, - pump and mixing valve for the low temperature zone, - PCB that controls the full system (diagnostics). Its main functions are: pump post-circulation; anti-blocking function both for pump and mixing valve; anti-frost system, protection against overheating. Moreover, it is possible to connect a second pump for the high temperature zone and also an external sensor for the automatic regulation of the heating flow water temperature.

KHG Accessory to transform the coaxial flue of the boiler in dual flue (length of the pipes up to 30m). Dual system

Technical Chart