Replace a central heating pump with this simple guide showing you how.
• Steadying the pump, loosen the large 50mm nuts on both valves. Have some towels ready as there will be a cup or so of water in the pump body and valve stems. NOTE HOW THE OLD PUMP IS ORIENTED BEFORE REMOVING IT. DIRECTION OF FLOW IS IMPORTANT.There should be an arrow on the pump body showing the flow direction.
• Rewire the power input lead noting the correct terminals for LIVE, NEUTRAL and EARTH, and replace any terminal cover.
You may need to loosen the bleed screw in the middle of the new pump about half a turn, until there are no air bubbles coming out. Ensure it is tight when finished.