The central heating pumps that are installed these days are very efficient but can sometimes breakdown and need to be replaced. When you purchase your new pump from your local merchant you must make sure that you have all the old pump details to hand. It will help to take measurements of its length and pipework connections. The majority of domestic pumps use a 1?in BSP threaded connection. (pumps are available with different outputs). Dalston Plumbers can fit new pumps.To Change a Pump:1). Isolate the electrical supply to the central heating system and pull out the plug as this is the usual way to feed the pump. Close 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.2). A good idea is to note and sketch the electrical wiring of the old pump. Then disconnect the wires with a screwdriver.3). Unscrew the union nuts holding the pump in place. Turning anticlockwise. Place a bowl and towels under the pump ready to catch the water that escapes when you remove it.4). Take out the pump. A Dalston Plumber can fit a new pump. Re-install the new pump and reconnect the wiring. Use the new sealing washers in the unions to stop leaks. When you are happy the pump is secure open the isolating valves (or refill the system) and check for leaks.5). Plug the pump in and test by turning on the central heating system at the programmer or time switch. You might have to turn up the room thermostat to get the system moving.When the central heating system is running, check that the open safety vent pipe over the feed and expansion cistern does not discharge water when the pump starts or stops. Bleed the system.
