MVHR - Anyone supplied/fitted one of these?

[sythai]

Evening All

Just seeing if anyone has any experience of these - MVHR?
And who would normally install it along with all the ducting?

I have a 'Eco' new build to price up with this set up.

Meeting Client this week to get full spec on the project, just have brief overview and basic plans so far.

Want make I have some idea of what I'm talking about when it comes to this!

Any pointers would be appreciated


Cheers Sy

 

[The Ghost]

Well I would contact the architect/site manager/designer and ask what spec they have in mind in writing and/or get a air change/volume calc etc. from the manufacturer.

 

[sythai]

Just wanted brief overview of what to expect really? Once I know it's down to me to install (and supply) will get full spec etc

 

[The Ghost]

any good?

 

[sythai]

any good?

Thanks for that.... looks quite involved, but do like a challenge!

 

[The Ghost]

yw

 

[sythai]

Just been checking a manufacturer we use 'National Ventilation'
...looks like the come out do site visit, plans, spec and commission.
Doesn't seem so daunting now.

 

[The Ghost]

That sounds much better already!

 

[AJshep]

Yes, Im not heavily involved as Im the one who ends up doing all the electrical jobs but I know enough.
Is it Passive house by any chance?
Best bet in moving forward for you. Have a design done, it should be done already, the Greenbuild store will do these also Greenwood Airvac/ Zehnder will create a design.
If the design changes (as it probably will slightly due to other services) your need to get it authorized as the airflow can be restricted.
The biggest problem is the physical size of the ducting/ silencers etc. which is even bigger once it insulated.
It requires a fair bit of thought and time to get right. I'm not going to lie but most people mess these up, it's why the small company i work for end up travelling around the country trying to put them right, the chap I work for is more interested in Ventilation now as the profit is much higher then electrics.
Actually we did a passive house, for a company based in Devon who specialises in Passive house builds

I

 

[sythai]

Is it Passive house by any chance?

Think it possibly is, this is the info from Client so far:

There is no gas supply to the house and no central heating.
There is no hot water cylinder.
The house is all electric but has no electric heating.
We are having solar PV panels and Tesla battery

 

[PEG]

The vast majority of installs i have had anything to do with,have only worked out easily,if part of the original build spec.

Retro-fit can be a proper pain,as large insulated duct runs,need open runs,in between joists,or a house can look like one of those Rotastak hamster communes.

Biggest issue with these new systems,is the same as all the other additional building improvements,which is allowing/organising/ensuring,that the various trades,all work in conjunction with one another....yes,i know

Most trades,responsible for a single part of the build,act with impunity,to any previous trade,and object to engineering assistance,to any following trade,unless made/paid.

A case in point,is the brick-layer Versus insulation battle.

It has raged for the last 30 years,and i see no end... The Germans had it sussed,i have watched them on new builds,and it is embarrassing to then see an average new build,here. Well,until 2pm on a Friday,anyway...

Back to the OP...the manufacturer will issue the spec,and supply the equipment. You will be given maximum runs,max number of fittings,vent positions,etc... and then ALL the other trades,will scupper your plans,before,during and after.

The suppliers will tell you to "adapt to site circumstances..."and when you do,and it does not perform as promised,it will be "installed not according to spec..."

Just my own experience,however,i hope your job goes swimmingly

 

[mhar]

It will look quite realistic and possible on the 2D design drawing, the 3D reality could well be different.
Your design may well ask for the high mode to be linked to the bathroom light switches or some people advise occupancy sensors in the bathrooms. I have only done one system but my customer is very pleased with my solution which was a single channel central heating programmer so high mode can be programmed for when showers are likely to be used. This programmer is adjacent to (but concealed) the range cooker so that the 1hr boost button can be used if required. I have left it so that I could insert a relay into the cooker hood to automtically trigger the high mode but this has not proved necessary.
Dry claggy mouths are quite an issue in this artificial environment, a compromise needs to be reached between removing moisture from bathrooms etc using high mode and customer comfort by not having high mode continually triggered as soon as anybody goes into a bathroom.
Individual humidistats in each bathroom / kitchen would be a lot better than occupancy sensors or light switch wiring.

 

[plugsandsparks]

My advice is. Get the locations of the MVHR units agreed first and get the ducting in first before all other trades. Stuff takes up lots of room.
cheers

 

[sythai]

Really appreciate your helps Chaps, all this feedback is great

1st visit to site tomorrow, so we'll see whats what!

Property is to roof level and watertight already, only got the call on Friday asking me to quote. Nothing like leaving it a bit late in the day! Normally get all the plans/ spec before before out of the ground.

 

[AJshep]

Really appreciate your helps Chaps, all this feedback is great

1st visit to site tomorrow, so we'll see whats what!

Property is to roof level and watertight already, only got the call on Friday asking me to quote. Nothing like leaving it a bit late in the day! Normally get all the plans/ spec before before out of the ground.

Good luck, one thing I forgot to mention, is solar shading !!
It maybe worth mentioning on your site visit, heat recoverys are so efficient now heat can be a problem especially in the summer month's.