User manual Kabola B-serie, 1-4-2005 9Figure 7Figure 64. Connect point 2 of the connector to point L1 of the room thermostat.Attention: The core diameter of the connections mentioned above must be between 1 and 1,5mm².The wires should be suitable for the voltage used.Connecting the circulation pump (see figure 5 and electrical scheme in appendix C)1. Connect the pump to points 3 and 4 of the connector.2. Connect point 5 to the ground connection on the pump3. Replace the cover of the main connector.Electrical installation 24 Volts DCWarning: Never change the + pole with – poleon the battery (See figure 6).1. The connection of the room thermostatis identical to the connection for the 230 Voltsversion. Use figure 6 instead of figure 5.2. Connect the circulation pump to points3 and 4 of the main connector.3. The core diameter of the wires to points5 and 6 of the connector should conform to thevalues intable 1.Table 1Distance to the battery Core diameter± 6 metres 6 mm²± 15 metres 10 mm²4.1.5 Filling the central heating systemThe pressure in the system should:• Never be lower than 0,5 bar cold;• Never be higher than 2,5 bar hot;Follow the procedure listed below for filling the CH-system (see figure 7)1. Switch off the boiler2. Turn the coupling nut below the pressure indicator to loosen it;3. Pull the hose connection a little downwards;4. Connect the hose with a hose clamp to the connection.5. Fill the system slowly with water, until the pressure indicator indicatesa pressure of 2 bar.6. Fasten the coupling nut;7. Bleed the CH-system8. If necessary, fill with water again up to 2 bar of pressure.9. Switch on the boiler and let the pump run for about 5 minutes.10. Switch off the boiler.11. Check the water pressure, if it is too low, repeat steps 5 through to 10;12. Remove the hose.Hint: The CH-system can be filled with cooling fluid, suited for CH-systems (pH-value 8.5).