Sunvic 3 port valve

[acmedone]

I have a Sunvic DM5601 actuator on top of a valve that has siezed and after turning it with pliers is now leaking. I notice that this is driven to each position, rather than returning by spring.

Obviously I need to replace the whole thing. So the question is, does it make any difference whether I fit a direct equivalent or a spring return type? It looks to me that is just a matter that the spring return type has no HW line and the boiler control out is ignored.

Spring return ones seem to have the advantage that if the boiler needs to be replaced in the short/medium term, the valve can stay; also replacement motors seem more readily available.

 

[swbjackson]

It depends on the rest of the control system.

 

[matt1e]

Obviously I need to replace the whole thing. So the question is, does it make any difference whether I fit a direct equivalent or a spring return type? It looks to me that is just a matter that the spring return type has no HW line and the boiler control out is ignored.

you can fit a spring return but you will have to connect it differently to the sunvic relay wiring centre to make it work, ask for details if you have the RJ2802 junction box (with a relay)

Spring return ones seem to have the advantage that if the boiler needs to be replaced in the short/medium term, the valve can stay

there is no difference between the two whatsover in that respect

Matt

 

[acmedone]

you can fit a spring return but you will have to connect it differently to the sunvic relay wiring centre to make it work, ask for details if you have the RJ2802 junction box (with a relay)

I have looked at it in more detail now and it's obviously just a simple logic change. If a Siemens 322 has the same colours as the L&G322 in my comparison system, it looks as though white goes directly to the demand side of the room stat and grey to pin 13 of the relay box (or even, directly to the not_demand side of the cylinder stat).

A replacement Sunvic works out a lot more than the Seimens 322 so worth doing the change.

 

[matt1e]

it looks as though white goes directly to the demand side of the room stat and grey to pin 13 of the relay box (or even, directly to the not_demand side of the cylinder stat).

yes connect the white to terminal 1 (CH demand)
yes connect grey to either terminal 11 or 13. the difference between the two is
grey to 11 will act exactly as standard mid position
grey to 13 the valve will always return to hotwater position on no ch demand, this may or may not be desirable
the valve orange you dont need so make it safe

Matt

 

[acmedone]

yes...
yes...

Matt

Thankyou