COMBI A - Instruction Manual

2. How to Use Switching

2. How to Use Switching on and filling instructions 1. Check the pressure in the central heating system is above 0.7 bar and below 1.5 bar with the pressure gauge 16 (fig.1), should it be necessary to re-pressurise the system,ensure the filling loop 45 (fig. 2) is attached, open the filling taps 43 & 44, the pressure gauge will now start to rise, once the pressure reads 1.0 bar, close the filling taps and disconnect the filling loop. 2. Check that the gas service tap is opened at the gas meter and the main power is on. Green indicator 26 Power ON 3. Open the gas tap 39 (fig.2). 4. The boiler is now ready to use. + NOTE: If the boiler is left off for a long time, some air in the gas pipe can hinder the first lighting attempts. (please refer to Section 19 Incorrect Function, page 53) + OPEN CLOSED Time setting You can set the time by using the keys underneath the display. Press the setting button for more than 5 seconds, the hours will begin to flash. You can now set the correct hour by using the + and - keys. Pressing the setting button again will make the minutes flash. You can set the minutes by using the + or - buttons. Pressing the setting button once more will store the set time. NOTE: THIS IS NOT A TIMER FOR CH CONTROL DHW mode Turn the control knob 29 between min and max. During the adjustment, flashes. The flashing goes on for a while after the adjustment, then the display indicates the time. When DHW is drawn, the display indicates the following: Comfort mode To activate the comfort mode it is necessary to press the comfort button, this will be indicated by a yellow light. The comfort mode has priority over any other heating request. There are two settings for the comfort mode (they can be adjusted in the parameters menu, see Section 17 Adjustments and Settings): 1. As soon as DHW is drawn, the secondary heat exchanger is kept warm for 30 mins. 2. As soon as DHW is drawn, the secondary heat exchanger is kept warm permanently. comfort When the boiler is operating in ‘comfort mode’ the display indicates the following: Heating mode Turn the control knob 30 between min and max. During the adjustment flashes. The flashing goes on for a while after the adjustment, the display will then indicate: - the central heating flow temperature if the room thermostat is calling for heat. - the time if the room thermostat is OFF. Room thermostat request symbol BURNER ON and output level The flame digits will increase or decrease depending on the output. Flame digit Burner ON 6

Stand-by mode Turn the control knobs 29 and 30 to the OFF position to deactivate the DHW and Heating. Leave the ON/OFF button On with the green light on. During the stand-by mode the display indicates the time, anti-seizing and antifreezing will be active, see below. Switch OFF Press the ON/OFF button. During this mode the boiler will not operate, but is still connected to the mains. Anti-freezing mode Turn the control knobs 29 and 30 to OFF to switch off the heating and hot water functions. Leave the On/Off button on with the green light on. When the anti-freeze comes on, the corresponding code is displayed with the snowflake pictogram . The two possible codes are 05 (anti-freeze - pump only) or 06 (anti-freeze - burner). 05: When this mode is active, the circulating pump operates for one minute and the diverter valve switches every 23 hours. Caution: in this mode, the room thermostat anti-freeze function is inoperative. Boiler anti-freeze function: the pump starts at 8°C the burner starts at 3°C 3. Maintenance Your boiler will work more reliably and efficiently if regularly serviced. We recommend an annual service check. The service history of the appliance will be marked in the Service Interval Record (Section 25, page 61). 4. Guarantee The manufacturer`s guarantee is for 2 years from the date of purchase. The guarantee is voidable if the appliance is not installed in accordance with the recommendations made herein or in a manner not approved by the manufacturer. To assist us in providing you with an efficient after sales service, please return the guarantee registration card enclosed with the boiler without delay. 5. Practical Information Cleaning the casing and control panel Should it be necessary to clean the casing and control panel. do so only with a soft damp cloth, do not use any spray polishes or cleaners. Precaution to avoid freezing We recommend you contact your installer or local service centre for further advice on the actions to be taken to avoid the system freezing (Should the boiler be turned off at the mains electrical isolator). • DHW system Turn off the main cold water supply and drain the boiler : - Open a hot water tap - Unscrew the cold water inlet tail • CH system Choose one of the following solutions : - 1) Drain completely the Central Heating system - 2) Protect the Central Heating system with anti freeze chemical products and verify the concentration periodically - 3) Leave the Heating mode switched on and set the room thermostat to anti-freeze mode (between 5 and 10°C) - 4) Leave your boiler in stand by mode, the anti-freeze device will switch on the pump and the burner if necessary. 7