Hi,

I'm about to install a heatmiser system with two zones. I've done the plumbing and set up two zones (upstairs & downstairs) using the above motorised valve, as per Heatmiser's recomendation.

I've drawn up a wiring diagram for my exact setup and sent it to Heatmiser for their review.

I understood the MV to require LNE connections and two auxillary connections (hence the 5 core cable). I believed the MV needed a continuous supply, and the aux connections were used to signal the valve to open or close. Heatmiser have said that I don't need the auxillary connections as the UH1 takes care of it from the boiler enable.

The V4035H is normally closed, so does that mean that a voltage will open the valve, meaning a constant voltage to keep the valve open?

If this is the case, what do the auxillary connections do?

My diagram is below. The connections in question are 1.1, 1.3, 2.1 & 2.3.



Many thanks

W.

Yes power on the brown will open the valve and the controller should do the rest.

Follow the sketch.

Is the yellow the orange.

_________________
If you feel you have benefited from the Free advice given on the Forum, Please consider making a donation to UHM's Nominated charity, read all about it and donate here :

donnas-dream-house-charity-t52110.html

Hi thescruff,

Superfast reply!

Do you mean that I should be showing the orange cable as yellow?

Thanks

W

Just checked the boiler.

Remove the link between bk 1 and bk2.

then connect bk 2 to the greys and bk 1 to the oranges.

The brown in the MV's are switched by the control.

The theory.

The brown opens the valve, and the micro switch connects the grey and orange to fire the boiler.

No the orange shows yellow in the pic.

_________________
If you feel you have benefited from the Free advice given on the Forum, Please consider making a donation to UHM's Nominated charity, read all about it and donate here :

donnas-dream-house-charity-t52110.html

Hi again,

Finally get the yellow. Changed to a deeper shade of orange.

I now understand the theory. Thank you.

I hope I've understood your instructions correctly, as per the updated diagram?




I've also included the manufacturers wiring diagram. From what Baxi has shown, I can largly ignore the remote clock, frost stat and room stat as the Heatmiser system takes care of those three functions. They've just shown it for clarity.

Many thanks for your time and help.

Yes that looks better.

Just one thing park the oranges and greys in terminal connectors.

Do you have a pdf or link the UH1

_________________
If you feel you have benefited from the Free advice given on the Forum, Please consider making a donation to UHM's Nominated charity, read all about it and donate here :

donnas-dream-house-charity-t52110.html

The UH1 wiring diagram?
http://www.heatmiser.co.uk/web/index.php/docs/finish/62-uh1-wiring-diagrams/151-heatmiser-uh1-wiring-diagarm

Interestingly, the diagram shows two wires (grey & orange) labeled as going to the boiler enabler.

"Park the orange and greys in terminal connections"? From the MVs? Because the cable is 5 core, but I only use the LN&E. Will do. The MVs only come with a meter lenght so I have to use terminals anyway. I was going to use the round black / brown type.


Thanks again.

Yes you don't want them lying around if the have current.

Are heatmiser saying you don't need the greys and oranges that is show in their drawing

_________________
If you feel you have benefited from the Free advice given on the Forum, Please consider making a donation to UHM's Nominated charity, read all about it and donate here :

donnas-dream-house-charity-t52110.html

Absolutly!

Question to Heatmiser:
"I've put together a wiring diagram that I'd be very grateful if you could review and confirm if it is correct. It is connecting to a Baxi Duo-Tec Combi Boiler. I've used your wiring schematic and reading the wiring diagram (The wiring diagram is inset in my diagram above)., I understand the PRT-NTS acts as the Room Stat, External Clock and Frost Thermostat.

Specifically, can you confirm if the connections 1.3, 2.3 should go to the boiler enable IN and 1.2, 2.2 goes to boiler enable OUT."


Reply: As the boiler isn't our equipment I can not verify the connections to this. The rest of the diagram seems correct but you can loose the auxilary wires from you motorised valves as the boiler will fire from the boiler enable swith on the UH1.


Confused. Me too!

Yes that is saying you don't need them.

Stick them in a connector strip so they are safe.

_________________
If you feel you have benefited from the Free advice given on the Forum, Please consider making a donation to UHM's Nominated charity, read all about it and donate here :

donnas-dream-house-charity-t52110.html

Just one question.

bk1 in the boiler is out. and bk2 in the boiler is the switch live.

The UH1 is shown the other way round, can you confirm with HM which is the supply and which is the switch live.

Edit.

Just found a circuit diagram for the UH1, and it is correct as you show it.

_________________
If you feel you have benefited from the Free advice given on the Forum, Please consider making a donation to UHM's Nominated charity, read all about it and donate here :

donnas-dream-house-charity-t52110.html

I think it's me that's got it wrong. HM's UH1 diagram has a note "To boiler switched live" coming from the "Boiler Enable OUT" terminal.
Also, their diagram shows a connection between live and "Boiler Enable IN". I guess this can be wired to bk1 also. (bk1 is the perminant live?)

Corrected my diagram accordingly:



Thanks again.


BTW I've found their stuff a little cheaper here:
http://www.inspiredheating.co.uk/acatalog/HEATMISER_TEMPERATURE_CONTROL_SYSTEMS.html

No, see my edit it was right before.

_________________
If you feel you have benefited from the Free advice given on the Forum, Please consider making a donation to UHM's Nominated charity, read all about it and donate here :

donnas-dream-house-charity-t52110.html

As you said, bk2 is the switched live. What about the note on the UH1 wiring diagram. "To boiler switched live"?

No see my edit and follow this drawing.

_________________
If you feel you have benefited from the Free advice given on the Forum, Please consider making a donation to UHM's Nominated charity, read all about it and donate here :

donnas-dream-house-charity-t52110.html