Actuator replacement

Flyfish

Hi,

two of my DVA2/5 Siemens actuators used in my house heating system are broken. See attachments.

imgur.com/H7xM0t7
imgur.com/3LFwMsp
imgur.com/Uwmhm3y

Don't think Siemens manufactures them anymore (they are 9 years old)

Beside as you see on the attached photos the design is not great: the motor gear is metal but the actuator gear is plastic - see the effect...

Do you know any actuators to replace them? (I don't think I can replace only that broken plastic part)

Tom44

Photos didn't work.

Flyfish

Yep, that's because I'm new to forum and I cannot add attachments yet
You have to copy the image address to the clipboard (ctr+c) and paste it into browser address bar (ctr + v)

Pete67

Still available, Siemens CZV222 is the valve with actuator, not sure if you can get the actuator separately, check with Heatmerchants or Chadwicks. If not they are available online - see here

Flyfish

So seems that best option here would to buy exactly the same actuators to avoid changing the valves. Still don't like the design of these actuators by Siemens though...

Alun

A lot of them now have plastic gears unfortunately.

I had my old Sunvic actuator, which still has metal gears, stop working on me a few weeks ago after it had to finally do some work after it's "summer holiday" so I stripped it down, cleaned it up and gave it a good greasing which helped it to to recover.

But what I also noticed was that the valve itself was a little stiff, so gave it a good squirt of WD40 and turned it round a few times by hand which made it much easier to turn. I could imagine that if the valve was too stiff that it could result in a few stripped teeth on a nylon gear like that, so it might be worth doing that before you replace the actuator.

Alun

A lot of them now have plastic gears unfortunately.

I had my old Sunvic actuator, which still has metal gears, stop working on me a few weeks ago after it had to finally do some work after it's "summer holiday" so I stripped it down, cleaned it up and gave it a good greasing which helped it to to recover.

But what I also noticed was that the valve itself was a little stiff, so gave it a good squirt of WD40 and turned it round a few times by hand which made it much easier to turn. I could imagine that if the valve was too stiff that it could result in a few stripped teeth on a nylon gear like that, so it might be worth doing that before you replace the actuator.

Flyfish

Good idea to check the valve itself and oil it if needed!

shareboy

Hi there,
My terrier actuators in a 3 zoned heating system have stopped working. Had plumber out and suggested that I upgrade to a 3 pump system instead of the 3 value system which I currently have. Just looking for some advice. New pump system would cost in or around 600. The valve replacement judging on internet searches would be 100 a piece. Should I upgrade? And what are the benefits.

K.Flyer

Unusual for all three to stop at exactly the same time. Other than the actuator problem, have you had circulation issues as well, what greater benefits did he say you would achieve with the pumps?

shareboy

K.Flyer wrote: »

Unusual for all three to stop at exactly the same time. Other than the actuator problem, have you had circulation issues as well, what greater benefits did he say you would achieve with the pumps?

My problem is I have three analog timer switches. 1 immersion 2 upstairs 3 downstairs. When I set either upstairs or downstairs o there own nothing happens even though the light comes on i.e doesn't kick in the boiler. But if I turn on the immersion switch and either or both of the upstairs/ downstairs switches they work. He said the pump system would operate faster as my pump is in the garage alongside the boiler and has a lot of work to do and this new system would speed thing up making it more economical.

K.Flyer

It sounds like a wiring problem to me.
Did it ever work correctly before e.g. when you turned on either upstairs or downstairs timers the boiler would fire?