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Instruction manual BFC gis 8.4 Service condition The figure shows the message !!! WARNING !!! MAX. BURNING HOURS: SERVICE REQUIRED SERVICE REQUIRED.Should this message appear, then the appliance is in need of a service and maintenance inspection. In that case, contact your service and maintenance engineer. Note The message SERVICE REQUIREDis based on the number of expired burning hours and the preset service interval. Should the service interval have been incorrectly selected, contact the service and maintenance engineer for instructions on how to adjust this. Information on the maintenance frequency is provided elsewhere in the manual (14 "Maintenance frequency"). Instruction manual BFC 8 Status of the appliance gis Instruction manual BFC gis 9 Starting and running 9.1 Introduction Topics covered in this chapter, in sequence: • Starting and running. • The appliance's heating cycle. 9.2 Starting and running Start the appliance as follows: 1. Fill the appliance (5 "Filling"). 2. Open (3.5 "Installation diagram") the manual gas valve. 3. Switch on the power to the appliance using the isolator between the appliance and the power supply. 4. Switch the electronic controller ON by setting the ON/OFF switch to position I. 0063 OI IMD-0423 R0 The display will now show INTERNAL CHECKfor about 10 seconds and go to the main menu. a INTERNAL CHECK a MENU »OFF ^ ON E WEEK PROGRAM a »START OPERATION ^ CHANGE SETPOINT E Tset=65EC 6. Confirm the START OPERATION by pressing . The appliance is now in "ON mode". If there is a heat demand, the appliance will run through the heating cycle (9.3 "The appliance's heating cycle"). If the heating cycle is not run, there is no heat demand; if this is the case, Tset will probably need to be set (11.4 "Setting the water temperature"). 9.3 The appliance's heating cycle The appliance's heating cycle is activated as soon as the measured water temperature (Tnet) falls below the threshold value (Tset). This threshold value depends on the currently selected appliance operating mode. For example, if the appliance is in "OFF mode" (frost protection), then this value is 5°C. If the appliance is in "ON mode", then this threshold value is selectable, for example, 65°C. The heating cycle runs in turn through the following states: 1. HEAT DEMAND; 2. PRE-PURGE; 3. PRESSURE SWITCH; 4. PRE-GLOW; 5. IGNITION; 6. RUNNING; 7. POST-PURGE. The complete cycle is explained in the following example, which assumes the appliance is in the basic mode ON. Note The same heating cycle applies to the other operating modes. 5. Press the blue arrow once ( ) to position the cursor in front of ON and press . The display shown in the figure will appear. Instruction manual BFC 9 Starting and running gis Once the appliance starts, it will run through the following steps: 1. The water temperature drops below the set temperature of (for example) 65°C. The electronic controller detects a demand and starts the heating cycle. - The icon is activated. -The message HEAT DEMAND appears. a ON E 13:45 Thursday 63EC Tset 65EC HEAT DEMAND 2. Once demand is registered, the fan is started to exhaust any gases that may be present. This phase is called pre-purge and lasts about 15 seconds. - The icon is activated. -The message PRE PURGE appears. a ON E E 13:45 Thursday 63EC Tset 65EC PRE PURGE 3. During the pre-purge, the pressure switch closes. -The icon is activated. -The message PRESSURE SWITCH appears. a ON E E E 13:45 Thursday 63EC Tset 65EC PRESSURE SWITCH 4. After some time, the pre-purge ceases and the electronic controller reduces the fan speed to the ignition speed. This is followed by the (pre-)glow of the hot surface igniter. - The icons and are dimmed -The icon is activated. a ON E E 13:45 Thursday 63EC Tset 65EC GLOW PLUG 5. After a number of seconds pre-glow, the gas control is opened and ignition takes place. - The icon is activated. -The message IGNITION appears. a ON E E E 13:45 Thursday 63EC Tset 65EC IGNITION 6. After ignition, the flame is detected and the appliance will be running. This means that actual heating has started. The fan speed then increases to the normal working speed, and the pressure switch closes: - The icon is dimmed. -The icons and are activated. -The message RUNNING appears. a ON E E E E 13:45 Thursday 63EC Tset 65EC RUNNING 7. When the water is up to temperature, the heat demand drops off and the post-purge starts. This lasts about 25 seconds. - The icons , and are dimmed. -The icon is activated. -The message POST PURGE appears. a ON E E 13:45 Thursday 65EC Tset 65EC POST PURGE 8. Following the post-purge, the fan stops and the pressure switch opens: - The icons and are dimmed. -The message POST PURGE vanishes. a ON 14:05 Thursday 65EC With any subsequent heat demand, the heating cycle will resume from step 1. Instruction manual BFC gis 10 Shutting down 10.1 Introduction This chapter describes: • Shut the appliance down for a brief period ("OFF mode"); • Electrically isolating the appliance; • Shu...

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