Baxi ECOGEN 24/1.0, Installation & Servicing Instructions Manual

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Fig. 3
Key
1 Supplementary Heat Exchanger 13 Engine Alternator
2 Burner ­ Supplementary 14 PCB Control
3 Ignition Electrodes 15 Water Flow Sensor
4 Flame Sensing Electrodes 16 Safety Thermostats
5 Supplementary Gas Valve 17 Flow Temperature Sensor
6 Engine Burner 18 Condensate Trap
7 Engine Ignition Electrode 19 Return Temperature Sensor
8 Engine Flame Sensing Electrode 20 Fan
9 Engine Gas Valve 21 Spool Valve Motor
10 Gas Inlet 22 Spool Valve
11 Boiler Flow 23 Venturis
12 Boiler Return 24 Overtravel Switches
3.2 Frost Protection Mode
1. If the boiler return temperature falls below 7° C, then the boiler pump and heating circuit pump/valve are activated or opened. If the temperature rises above 8° C, the frost
protection function will be terminated. If the boiler return temperature falls below 3°C, the supplementary burner will be switched on until the return temperature reaches
25°C and the appliance frost protection is stopped.
2. If the supplementary burner is locked, the engine burner will be used. In this case, the return temperature limit to start the burner is increased from 3 to 10°C.
3. If an existing room thermostat is to be used then further protection for the system can be incorporated by using a wall mounted frost thermostat. In certain circumstances
it may be necessary to fit a pipe thermostat. If the THINK Controller is used as a room sensor then it will act as a room frost protection unit as well ­ see Section 10.15.
3.3 Pump/Diverter Valve Protection
1. The pump and valve kick is a protective function aimed at preventing the pumps and valves from seizing.
2. Every Friday at 3.00am, the pumps and valves connected directly to the boiler unit are switched on 30 seconds and off for 30 seconds, one by one.
3.4 Legionella
1. When a DHW cylinder is fitted with a temperature sensor an anti­legionella function can be activated, so that at initial DHW charge and there after at regular intervals the
cylinder is heated to destroy any legionella bacteria, the cylinder temperature is raised to 65°C.
2. By default this function is not active. Customers have the choice to activate the function and set how often, or on what day, and at what time this function runs.
Customers should be informed that the temperature reached may be considerably higher than their normal requirements (See Section 11.3 paragraph j).
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4.0 Technical Data
4.1 Ecogen 24/1.0 and Ecogen 24/1.0 LPG