Note : This adjustment does not affect the domes-tic hot water output. If measured burner pressure differs greatly from the given figure, check the gas inlet pressure as follows: •Shut down boiler. •Remove screw from inlet test point on the side of the gas valve,

COMMISSIONING

Technical Data ' for the type of gasbeing used. •Adjust the range rating adjuster screw as neces- sary to obtain the desired input. •Shut down boiler. •Remove pressure gauge, tighten up test point screws and check for gas soundness. •Using a ball point pen, clearly indicate on the data label the input the boiler is set to. •Set boiler thermostat to maximum and checkthat any external controls are calling for heat. •Check that the reading on the gauge matches that given in '
Diagram 17 Reg 014 •Shut down boiler. •Remove pressure gauge, tighten up test point screws and check for gas soundness. •If the gas pressure is incorrect, refer to the Fault Finding section in ' Servicing Instructions '.•If the inlet pressure is below that given, the gas supply pipework/meter must be checked and any fault corrected. •In the case of an LPG installation, check the stor- age tank or cylinder, regulator and pipework. ° C. Whenthe temperature reaches 16

OPERATING SAFETY DEVICES

° C, the boiler stops. Note: This device works irrespective of any roomthermostat setting and only protects the boiler. Al- ways ensure that adequate frost protection is given to the entire system where necessary. Air in the heating system Gas leak or fault If a gas leak or fault exists or is suspected, turn the boiler off and consult the local gas undertaking or your installation/servicing company. Important notice: Persistent air in the heating system may indicate leaks in the system or corrosion taking place. Call your Installation/Servicing company. Overheat safety A central heating system cannotoperate satisfactorily unless it is properly filled with water and unless the air initially contained in the piping systems has been properly bled off. If these conditions are not satisfied, air noise will occur within the system. In case of loss of water in the systemCAUTION In the event of a problem, the overheat safety devices cause safety shutdown of the boiler. If this happens, call your Installation/Servicing company.The THELIA 30 E boiler has a built in frost protectiondevice that protects the boiler from freezing. If the boiler is to be left and there is a risk of frost, ensure that the gas and electrical supplies are left con- nected and that the OFF/Summer/Winter switch is left in the'Summer' or 'Winter' position.The frost pro- tection device will light the boiler when the tem- perature of the boiler water falls below 6 In case of power supply failure . The boiler is installed as part of a sealedsystem which must only be drained and filled by a com- petent person. If the pressure shown on the pressure gauge is less than 1 bar or if the red loss of water warning light is ON, the sys- tem must be filled up immediately. Call your Installation/ Servicing company. The boiler no longer operates. As soon as power supply is restored, the boiler will be automatically restarted. Air flow rate safety device If an obstruction, even partial, of the flue occurs, for any reason whatsoever, the built in safety sys- tem of the boiler will turn the boiler OFF and the fan will continue to run. The boiler will be ready to operate when the fault has been cleared. 14