Vaillant ECOTEC EXCLUSIVE 627 VU 256/5-7 Installation And Maintenance Instructions Manual

Vaillant ECOTEC EXCLUSIVE 627 VU 256/5-7 Installation And Maintenance Instructions Manual Manual pdf 21 page image

Start-up 70020193966_01 ecoTEC exclusive Installation and maintenance instructions 217.13 Gas inspection7.13.1 Checking the leak-tightness of the flue gasinstallation and flue gas recirculation1. Check the flue gas installation is intact in accordancewith the latest gas safe technical bulletin and informa-tion supplied in the installation instructions.2. For extended flue gas installations check for flue gasrecirculation using the air analysis point.3. Use a flue gas analyser.4. If you discover CO or CO2 in the supply air, search forthe leak in the flue gas installation or for signs of fluegas recirculation.5. Eliminate the damage properly.6. Check again whether the supply air contains any CO orCO2.7. If you cannot eliminate the damage, do not start up theproduct.7.13.2 Checking the gas flow rateThe gas flow rate has been set during production and doesnot require adjustment. With the front casing fitted check thegas flow rate of the boiler as follows:▶ Start up the product with the check programme P.01.▶ In addition, ensure that maximum heat can be dissipatedinto the heating system by turning up the room thermo-stat.▶ Wait at least 5 minutes until the boiler has reached itsoperating temperature.▶ Ensure that all other gas appliances in the property areturned off.▶ Measure the gas flow rate at the gas meter.▶ Compare the measured values with the correspondingvalues in the table.Qnw from the dataplateH gas in m³/hNom. +5% −10%15.3 1.62 1.70 1.4618.4 1.95 2.05 1.7624.7 2.61 2.74 2.3525.7 2.72 2.86 2.4528.6 3.03 3.18 2.7330.6 3.24 3.40 2.9235.7 3.78 3.97 3.40Conditions: Gas flow rate not in the permissible range▶ Check all of the piping and ensure that the gas flow ratesare correct.▶ Only put the product into operation once the gas flowrates have been corrected.Conditions: Gas flow rate in the permissible range▶ End the check programme P.01.▶ Allow the boiler to cool down by allowing pump overrun tooperate for a minimum of 2 minutes.▶ Record the boiler maximum gas flow rate onto theBenchmark gas boiler commissioning checklist.7.13.3 Checking the gas flow pressure1. Ensure that the gas inlet working pressure can beobtained with all other gas appliances in the propertyworking.2. Close the gas isolator cock.123. Use a screwdriver to undo the sealing screw of themeasuring nipple (1) at the gas valve.4. Connect a pressure gauge (2) to the measuring nipple(1).5. Open the gas isolator cock.6. Start up the product with the check programme P.01.◁ S.93 is briefly displayed.◁ If the display switches to S.04, the product is readyfor the measurement.7. In addition, ensure that maximum heat can be dissip-ated into the heating system by turning up the roomthermostat.8. With the boiler operating at full load check that the gasinlet working pressure at the reference test point com-plies with the requirements.9. Measure the gas flow pressure in comparison with theatmospheric pressure.– Permissible gas flow pressure for operationwith G20 natural gas: 1.3 … 2.3 kPa (13.0… 23.0 mbar)– Permissible gas flow pressure for operationwith G31 liquid gas: 2.3 … 4.3 kPa (23.0… 43.0 mbar)10. Should the pressure recorded at the reference testpoint in the boiler be lower than indicated check if thereis any blockage in the pipework or if the pipework is un-dersized.11. Decommission the product.12. Close the gas isolator cock.