thermoelectric actuators on CH and DHW

[plasma3030]

hello all,

I recently moved into a new place and it has a system boiler with 4 zones: 3 x CH and 1 x DHW (to an unvented cylinder). Each zone has a thermoelectric actuator on 15mm, reducing from 22mm down to 15mm through the actuator valve and then back to 22mm going off to rads etc:

I need to replace one of the valves and actuators on a CH zone as the actuator is not working and the valve is worn and leaking when the pin is depressed. I have ordered this for the valve and this for the actuator.

a few questions:
1) Will the above replacement parts work? I think I need DN15 for 15mm pipe and I can get a couple of nuts and olives to install
2) Is this an unusual/non-standard set up? Would it be better to go with something like this?
3) Should I be concerned that the valve has a 4mm stroke, yet the actuator is 3mm? There is a 3mm version of the valve but it's not available for a couple of weeks and would prefer not to wait.

Thanks

 

[plasma3030]

Bumping this in case anyone can advise

 

[Deleted member 267285]

Are you sure it’s thermoelectric? Looks like a trv imo

 

[plasma3030]

Thanks. Yeah it is one of these: https://oem.moehlenhoff.net/index.p...flypage=moehlenhoff.tpl&product_id=50&lang=en

 

[Iddy]

What you have is similar to this idea, including a 4 wire actuator with an end switch:

Betty's Zone Valve 300l/hr

Betty's Zone Valve - 300l/hr This product is the brain child of Kimbo Betty (Heating Academy Northampton) and comprises of: 1 x IMI 1/2" Straight Valve with 300l/hr AFC Insert 1 x 15mm Compression Adaptors 1x Honeywell Home 4 Wire Thermal Actuator (with end switch). It is capable of flowing a...

theintergasshop.co.uk

You should be able to adapt with 1/2" female threaded fittings rather than nuts and olives - it doesn't look like there's a chamfer on that valve to accept an olive. In the picture on link above, you'll see the brass fitting on the left hand side - you'll need 2 of those.

Flomasta Brass Compression Adapting Female Coupler 15mm x 1/2" - Screwfix

Order online at Screwfix.com. Female couplers. FREE next day delivery available, free collection in 1 minute.

www.screwfix.com

Or to connect to 22mm:

Flomasta Brass Compression Adapting Female Coupler 22mm x 1/2" - Screwfix

Order online at Screwfix.com. Female couplers. FREE next day delivery available, free collection in 1 minute.

www.screwfix.com

Edit: Looking at the datasheet for the valve, it may be 3/4", so you'd need to change the adaptors accordingly...

 

[DP]

Look at Honeywell Evohome or Tado smart TRV heads

The spindle that is leaking, can be changed or o rings replaced. ( done that )

 

[plasma3030]

Thanks for the replies.

I might try to change the spindle first. Can’t find the replacement part online but not sure really what to search for. Any ideas? Or would I get a new valve and swap just the spindle out?