Tower Valve Sticking Microswitch?

nyquist · 24 Jun 2011

Hi,

My 30 year old system has Tower zone valves. One of the valves has a sticking microswitch or faulty switch actuating mechanism, which causes intermittent problems. The problem sees to be worse when the boiler temperature is turned down.

I know which valve it is, but wonder whether it's likely to be the actual micro switch, or the mechanism which drives it, which is very crude and difficult to check.

Is there a recommended supplier for these microswitches?

Your help would be most appreciated.

Jordon · 24 Jun 2011

Put a new power head on complete, tower are cheap anyway so to change it would be easier the messing with it

Agile · 24 Jun 2011

Are you Harry Nyquist?

nyquist · 25 Jun 2011

Jordon said:
Put a new power head on complete, tower are cheap anyway so to change it would be easier the messing with it

Hi Jordon,

Many thanks for the suggestion. I was hoping to avoid draining part of the system, and any plumbing work. I would find it easier to replace the micro switch

Pleased to know that the valves are still available after all these years. There are three valves on my system, so I would probably replace them all.

Cheers

nyquist · 25 Jun 2011

Agile said:
Are you Harry Nyquist?

Hi Agile,

Yes! Was he gas-safe?

Cheers

mysteryman · 25 Jun 2011

Just change the heads, as already suggested.

Jordon · 26 Jun 2011

No need to drain just the head you will get the body but always handy to keep. Ta

nyquist · 26 Jun 2011

mysteryman said:
Just change the heads, as already suggested.

I've changed motors many times, but didn't realise that the head would come off as a complete unit.

I'll get a complete unit, and just use the head.

Which screws should I undo to remove the head?

Many thanks for all the help.

Cheers

mysteryman · 26 Jun 2011

The two big ones on diagonally opposite corners.

holty · 26 Jun 2011

tower valves iv seen use the same heads as honeywell. vica versa.

Agile · 26 Jun 2011

Harry Nyquist is credited with the mathematical assessment of a modulated RF signal.

nyquist · 28 Jun 2011

mysteryman said:
The two big ones on diagonally opposite corners.

Thanks, I'll have a look.

nyquist · 28 Jun 2011

holty said:
tower valves iv seen use the same heads as honeywell. vica versa.

That's interesting and good news. I'm surprised that you can't buy the heads separately. Seems such a waste to have to throw away the body, when just the micro switch has failed.

nyquist · 28 Jun 2011

Agile said:
Harry Nyquist is credited with the mathematical assessment of a modulated RF signal.

He's probably better known for the Nyquist diagrams, which were used in the study of stability in linear control systems.

nyquist · 29 Jun 2011

mysteryman said:
The two big ones on diagonally opposite corners.

I've now had a look at the valve. It seems that the plate containing the motor has to be removed first, then the two supporting pillars unscrewed, to release the remaining part of the head.

Does the group have any recommended on-line suppliers for Tower products? ie. Quick delivery, low postage and minimum order costs.

Cheers

diynot

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Tower Valve Sticking Microswitch?

mysteryman

mysteryman

holty

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