1). Cold Radiator.If the pump sounds like it is running but one or more radiator stays cold, there may be an airlock in the pump. Find the pump and identify the bleed screw. Place a bowl under the pump and open the bleed screw to allow the air out. As soon as the water appears at the screw, tighten it up and retest the system. Croydon Plumbers can do this task.2). Rotor Jammed.Sometimes the rotor in the pump will stick and although you can feel some vibration at the pump, the mechanism will not be running. Some pumps have a cover screw to undo and allow access to the pump spindle. Most times turning with a screwdriver will free the spindle.3). Pump Types.There are three types of circulating pump:Single Speed (fixed head) and Variable Speed. While a variable speed unit is slightly more expensive it is more flexible which justifies the extra cost.4). Replacement Pump.Always replace a pump with the exact same pump. (take the old one with you to compare if possible). 5). Pump Speed Adjustment.To adjust the speed of a central heating pump there is usually a small rotary switch on the pump that can make adjustments.6). Valve Replacement.Control valves are electrically driven. Before replacing always check wiring and control unit are ok first.7). Impeller.Sometimes the pump impeller will jam and fail to pump. Before anything else always check this first as any blockage can usually be removed by hand fixing the problem. If replacement is required make sure that the system is free of all debris prior to fit.8). Tools.If the pump is fitted between two large nuts you will need two large adjustable wrenches to change it. Make sure not to overtighten. A Croydon Plumber carries these tools.
Aligning.The procedure of setting one part on or against another, such as a socket on a wall, with the help of a measure and spirit level. This is carried out by Croydon Plumbers .Airlock.An airlock is air that has become trapped in a pipe, stopping fluid from flowing from a tap. A possible cure is to use a length of hose and slip it over the affected tap and the kitchen cold water tap. Turn both taps on fully and the mains pressure should force out the air. Should this not work, try placing a hose over the affected tap and blow down with a bicycle or car tyre pump.Cap Nut.Is the nut part of a compression joint. In action, the cap nut squeezes the olive into the body of the fitting resulting in a good solid join. A Croydon Plumber is expert in the use of these nuts.Cesspit.A large buried tank used to collect sewage and wastewater. Cesspits are a bad option as they need to be emptied on a regular basis.Draincock.The draincock is the lowest tap in an appliance from which the water can be drained. To drain a system you simply slip A hose onto the draincock and run the other end outside into the garden. Then turn on the tap.Insulation Tape.Plastic PVC sticky back tape comes in a range of colours to match the colour coded sheathing on electrical cables and flexes. It is used to identify and insulate cores on switch circuits where the bare core runs from cable to terminal. It is also used to label pipe runs and bind up low pressure leaks.Rising Main.The cold water pipe that runs from the suppliers stopcock to feed water to the kitchen tap and cold water storage tank in the loft. This is the first valve you close in an emergency.