Heating help!! (myson power extra)

Yulkmn

So i have moved into a new house (3 years old) and since then every time i try to turn on hot water the rads and hot water heat up and every time i turn on centrel heating the rads only turn on !
How do i change it so that my rads only turn on when centrel heating is turned on and that when hot water is turned on that ONLY hot water heats up ??
Thanks

PS.. i read up that its something to do with the myson power extra valve or something like that behind the boiler..

meercat

seems like a wiring problem
may need to get a sparks in
i dont think its as simple as swapping the mini valves over

Yulkmn

Thanks for the reply
I got the plumber in 3 times and every time he changes it, ie. Changes them around like the heating and the water and the last time he was here he left it like this..

One time it was that HW heated up the rads and the hot water and that CH .. And now its HW heats up hot water and rads and CH Heats up rads ..then i rang the plumber up to change them he changed them wrong.

But i want CH to heat up the rads and hot water and HW to heat up just hot water .. I think thats what its supposed to do anyway!

meercat

Yulkmn wrote: »

But i want CH to heat up the rads and hot water and HW to heat up just hot water .. I think thats what its supposed to do anyway!

spot on

best get a sparks i think
it is just a matter of changing a few wires around

DGOBS

Sounds like you have a dodgy 3 way mid position diverter valve or something, a picture would speak a thousand words here

Yulkmn

DGOBS wrote: »

Sounds like you have a dodgy 3 way mid position diverter valve or something, a picture would speak a thousand words here

I dont know the myson power extra thing seems fine.. Does anyone know how i could close and open the valves ? Just like the plumbers did they opened and closed it non of them were spot on ..

Yulkmn

meercat wrote: »

spot on

best get a sparks i think
it is just a matter of changing a few wires around[/Quote]

The plumber said it all fine .. Its just that he never set up the myson power extra properly i think..

DGOBS

Its a 3port mid position valve, so it is

a) either wired incorrectly so calling for both dhw and ch when only dhw is called for

b) not fully moving to the dhw position (not closing fully)

Tell your plumber to RTFM, for gods sake, or did he stop learning when he finished his apprenticeship

Yulkmn

DGOBS wrote: »

Tell your plumber to RTFM, for gods sake, or did he stop learning when he finished his apprenticeship

Haha ^^.. I actually dont know! I jus know that he said everything is fine ! And he jus goes into the little boiler room and switches something and it all changes ! I just want to know how can i change them !! ?? I would just changed them around until i got them right...

DGOBS

google and follow a wiring 'Y-plan' for 3 port MV

Yulkmn

DGOBS wrote: »

google and follow a wiring 'Y-plan' for 3 port MV

Im not very good with wiring but i just looked at the myson power extra and it has like a picture of 2 rads on it and there are 2 arrows pointin on one of the rads and 1 arrow pointing on the other rad... And above that there is like a sliding switch and it says " manual override only" ... If thats any help...

DGOBS

You would need to follow the wiring diagram between your time and temperature controls to the valve and confirm the correct wiring

Yulkmn

DGOBS wrote: »

You would need to follow the wiring diagram between your time and temperature controls to the valve and confirm the correct wiring

i have just checked and the wiring is all fine i found some instructions.. But still problem not solved !

Yulkmn

Yulkmn wrote: »

i have just checked and the wiring is all fine i found some instructions.. But still problem not solved !

Asper post 8, either wired incorrectly(which I'd go for) or sludge in the system stopping the valve from operating properly.

Yulkmn

Does anyone know how i can manualy change the way the valves operate like the plumber does???

Yulkmn

Yulkmn wrote: »

Does anyone know how i can manualy change the way the valves operate like the plumber does???

The MPE 322/328 is designed to control water circulation in primary hot water and central heating circuits, by diverting flow to either circuit or to both simultaneously using a single valve.

For convenience the two neon indicator lights illuminate indicating which port is open.

When the manual lever is moved to the right, ports A and B are open, this is used when filling, venting or draining the system. The spring return, Mid-Position actuator – valve rests in the hot water only position.

http://www.myson.co.uk/static_files/my/media/downloads/MPE_322_Installation_sheet_Sept_2009.pdf