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Looking through a couple of the quotes, both suggest using a pair of 63mm ducts where the single duct airflow is too high. I assume this is the approach others on here us? In my case  Smaller diameter ducts would be easier to run. Could I terminate these in separate outlets (in the same room) rather than one single outlet?

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39 minutes ago, Triassic said:

Could I terminate these in separate outlets (in the same room) rather than one single outlet?

Yes,

you just need the total flow to be correct, doesn't matter if you one or ten outlets from a compliance point of view.

 

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Looking next at the boost function.
 

Some mention having a button to press, for others the boost comes on when the light in the bathroom is switched on, others us a RH sensor. Which is best practice, simplest method (foolproof!)  cheapest?

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For ours the RH sensor works extremely well for showers, baths, some cooking (boiling) and drying clothes... However, it's obviously no good for cooking smells so for that we've got a boost button next to the hob. Similarly, we have boost buttona outside the bathrooms but tend to rarely use them. 

 

The boost buttons are actually wired as inputs to a smart relay which, in turn, triggers the boost function as eventually once I get more time (yeah right!) I'd like to experiment more with home automation, voice control etc for various things which may or may not include the ventilation system. 

Edited by MJNewton

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1 hour ago, MJNewton said:

The boost buttons are actually wired as inputs to a smart relay which, in turn, triggers the boost function as eventually once I get more time (yeah right!) I'd like to experiment more with home automation, voice control etc for various things which may or may not include the ventilation system. 

 

Yeah on this line my current thought here is to put energy meter on the hob & oven, and just have the HA crank up the boost when they go above a certain threshold. Originally I was going to try and hook it into the hob extractor fan, but this seems simpler and might even reduce the need to run the extractor.

Same for the washing machine?

Coffee machine and bread maker could also be monitored with a negating effect, to keep those smells around longer :-D 

 

Edited by joth

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Thanks for the replies regarding the boost options.

 

I have a vaulted ceiling in the kitchen family room. I was thinking of positioning the inlet and extract vents  at around 2m above the floor.  I was thinking that I could have the extract rate slightly higher than the input rate, in that way the air flow would be from the family side of the room to the kitchen extract. Is 2m too high given that the peak of the vaulted ceiling is around 4 m tall?

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24 minutes ago, joth said:

 

Yeah on this line my current thought here is to put energy meter on the hob & oven, and just have the HA crank up the boost when they go above a certain threshold.

 

Yes, I was thinking about similar. Did you have a particular plan in mind? I assumed that a non-contact current transformer wrapped around the live feed would be the best sensor but wasn't sure on the best/safest place to do this given that the cores are only separated at each end where there's not much room to fit anything else like this?

 

That said, I was assuming it'd be done at the hob/oven end but maybe inside the consumer unit would actually be the easiest place to do it?

Edited by MJNewton

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8 hours ago, MJNewton said:

 

That said, I was assuming it'd be done at the hob/oven end but maybe inside the consumer unit would actually be the easiest place to do it?

With I double decker CU I should be able to put an Eastron SDM120CT on each circuit of interest. They're going for about £22 on AliExpress and reasonable examples of using them around. Definitely want the CT rather than direct connect version, to keep it non-intrusive in the circuit commissioning.

There's also the very cheap alternative PZEM-016, but looks messy to put in a CU

 

 

 

 

Edited by joth

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The MVHR is automatically boosted when the light is turned on ( via a auxiliary relay,,  and runs for 15 minutes after the light is turned off, in each of the downstairs WC, the bathrooms ( family and ensuites).

 

Our MVHR system has a remote control panel ( which allows us to control all the MVHR settings), which is installed in the hall, close to the kitchen and utility room.  So for us, it is a simple matter to manually switch the MVHR to boost when required when coking or drying clothes in the utility room.

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1 hour ago, HerbJ said:

Our MVHR system has a remote control panel

How is this connected WIFI or hard wired? If hard wired, how many core cable size 

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7 hours ago, Triassic said:

How is this connected WIFI or hard wired? If hard wired, how many core cable size 

 

It's a propriety system supplied with the MVHR system by PAUL. In fact, there is no control panel on the MVHR  Unit. The touch screen control panel  is directly connected to the MVHR by Cat6 cable and there is a special connector at the unit.  From memory, there are only 3 cores of the CAT6 cable used.

 

There is no connection to the internet for my model, but I believe that this may now be an option. 

 

https://www.paulheatrecovery.co.uk/product/paul-tft-touch-screen/

 

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I’m starting to look at prices and placing orders.

 

Ive found plenum are £5 each suitable for 75mm duct pipe.

 

This set me to wondering, are the plenum from different manufacturers all made to the same standard size and conversely, is 75mm ducting from different manufacturers/ suppliers all the same size?

 

I would hate to buy plenum from one firm and find they aren’t compatible with another’s pipe.

Edited by Triassic

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Im tight myself but being new to this system I just went with a one stop shop and accepted that I probably overpaid a little. I'm happy to start shopping around once I grasp a subject but just wanted this to be all supplied by one firm. My 2 pence!

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@Oz07 I get your point. I’m thinking I’ll go with BOC Ventilation, as they appear to be well thought of on here.

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That's what I did. Im not sure their sales dept is that knowledgeable but you can discuss with the technical side. 

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