Gas boiler installation

When it comes to installing a gas boiler, you must ensure the person carrying out the installation is qualified and competent and is working in compliance with the Gas Safety and Use Regulations.

Steps to success

The first stage of installation is to unpack the boiler and parts and check each piece carefully to make sure it is all working correctly. As well as the boiler parts there should also be an installation manual, a warranty card. Also in the pack. there should be a mounting bracket, fixings, valve and boiler template.

Stage 1 – Using the boiler template, mark on the wall the positioning of the boiler, it is important that you follow all the spacing recommendations outlined in the installation manual.

Stage 2 – Drill the holes for the mountings and plug them, then fit the boiler mounting plate. The boiler can then be positioned on the mountings. At this point secure the boiler, using the bottom fixing points.

Stage 3 – You are now ready to start connecting your boiler. At this point care must be taken to ensure that you follow the instructions in the installation manual to the letter. The gas isolation valve is marked differently to the other valves and has a different shaped washer to distinguish it from the others. Ensure all the valves are secured.

Stage 4 – These are the standard boiler connections, check each one is connected, and then double check the connections: flow, return, PRV, gas, condensate, hot water outlet, cold water supply.

Stage 5 – The boiler has an inbuilt magnetic filter, which helps protect the boiler’s internal components and a filling loop, which should be connected between the cold main and the return pipe work.

Next steps…

The next stage of the process is fitting the flue and power. The flue must protrude 140mms from the outside wall to the end of the terminal. It is connected to the boiler by an internal adapter. These must be lined up carefully. Finally connect the flue bend to the flue connections on the boiler, there is a rubber seal and a metal band to connect these correctly.

The next stage is to connect the boiler to the external power source. Remove the electrical connection cover, route the cables through the grommets and connect according to the instructions in the manual. The power cables must be connected to a three amp spark. Once all the connections have been completed, replace the connection cover.

Energising the boiler

You are now ready to energise the boiler. Normal operating pressure is 1.5 bar but at this stage pressurise it to 2 bar. The boiler will show an error message of E02, indicating low pressure – simply press the reset button to see the actual pressure.

Bleed all radiators and open automatic air vent. Before starting the system take a moment to re-check everything and make sure it is all installed as per current industry regulations and standards. Purging and gas soundness tests should also be carried out at this stage. All boilers are preset to factory settings and should not need resetting. At this point the boiler pressure should be running at 17 milibars. Check CO2 readings at the flue and make sure that all readings conform to the installation instructions manual.

Your boiler should now be installed and working perfectly.