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Changing the Central Heating Pump
Domestic pumps are now a standard size, so if old pump was longer than the new one you may need adaptors to fill the gaps. When you go to buy a replacement from a plumbers merchant take all the details of the old pump with you. Measure the length of the old pump, and the diameter and type of the connections. Most domestic pumps have 1?in BSP threaded connections. Also note the type of pump and the setting of its output regulator (domestic pumps are available with different strengths). Chelsea Plumbers can fit new pumps.1). Switch off electricity to the central heating system and pull out the plug.2). Make a note and sketch of how the electrical wiring of the old pump is connected. It may be helpful to label each wire. Then disconnect the wires with a screwdriver.3). Closed the isolating valves on each side of the pump using the valve handles or an adjustable spanner. If there is no isolating valves drain down the system.4). Put a bowl and towels under the pump ready to catch the water that escapes when you remove it.5). Unscrew the union nuts holding the pump in place. Turn them anticlockwise (facing along the pipe towards the pump).6). Remove the old pump. A Chelsea Plumber will remove an old pump.7). Fit the new pump in position with the new sealing washers in the unions to prevent leaks. Open the isolating valves (or refill the system) and check that the unions are watertight.8). Dry the pump carefully to remove any traces of moisture, and re-connect the wiring.9 Test the newly installed pump by switching on the electricity supply and turning on the central heating system at the programmer or time switch. You may also need to turn up the room thermostat to get the system going.10). Once the central heating system has started up, check that the open safety vent pipe over the feed and expansion cistern does not discharge water when the pump starts or stops.11). If you have to add too much freshwater to the cistern, bleed any air out of the system in order to guard against future corrosion and to protect the new pump.