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Old 08-04-2008   #1 (permalink)
J-Man
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Join Date: Apr 2008
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Default Heating system pump / diverter valve

Hello Everyone,
New member here searching for some help!!!

Currently out of work so money is an issue, which is why I'm trying to see if I can do the work myself. I have no plumbing knowledge, but I'm very practical and can tackle most problem - providing I have the background knowlede!

I live in a victorian terrace two story house. On the ground floor in the kitchen I have an old gas boiler that does the heating and hot water. On the floor above, in the airing cupboard there is a hot water storage tank ( no immersion element ), and next to that is the pump and diverter valve. Directly above in the attic is a small tank with ballcock. In an adjoining attic is a large cold-water tank.

My reasonably old heating system is in need of some care. The problem being that the pump is making a consistent ( and slowly getting worse ) clattering sound, which I've been told is the bearing. So I am thinking to replace the pump, and while I'm at it also the old Diverter valve.

Details:

The pump is a: Grundfos,
Type UPS
15-50x18
50Hz
Mk II.

The diverter valve is: Honeywell
Sundial Y Plan
3 Position Diverter Valve


So first question, what shouls I replace them with? Ie. newer better more efficient models??

Second question. The cutoff valves above and below the pump look truely siezed - they are the ones operated by screwdriver. If this is the case, does that mean I'll need to drain the whole system? How does one do that, and as importantly, how do you fill it up again ( ie no airlocks etc, )? Or am missing a trick here, such as freezing the water ( seems a large dia pipe to do this ).

All advice gratefully received!!

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