Pumps and Valves (some problems)

Disconnect (a Speed Fitting)
April 8, 2014
Know your plumbing system
April 10, 2014
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1). Rotor Jamming.
Sometimes the pump rotor can stick and even though you can feel some vibration at the pump, it will not be running. Some pumps have a cover that will allow access to the pump spindle. Most times turning with a reasonable sized screwdriver will free the spindle.

2). Replacement Pump.
Always replace a pump with the exact same pump. Do this by taking the one you have removed to the merchants with you.

3). Radiator cold.
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. Finsbury Park Plumbers can do this job.

4). Pump Speed Adjustment.
In order to alter the speed of a central heating pump there is usually a small rotary switch on the pump that can make alterations.

5). Pumps.
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.

6). Tools.
If the pump is fitted between two large nuts you will need two large adjustable wrenches to change it. Make sure not to over tighten. Finsbury Plumbers carry these tools.

7). Valve Replacement.
Control valves are electrically driven. Before replacing always check wiring and control unit are ok first.

8). Impeller.
Now and again the impeller inside the pump, jams and will fail to pump. 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.

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