Condensation in the unit

[Coanda]

So far there has been no condensation in my DIY unit.

 

However, I am in the design stage of DIY unit 1.1 which will be a much better insulated twin core model.

 

Am I right in thinking, should any condensation form, it will be in the extract (from home) chamber and that is where I should put a drain? Just in case.

[MikeGrahamT21]

Drain goes in the extract chamber, which has the fan to suck the air in and blow it outside, so on the cold side of the heat exchanger, usually bottom left in most units.

[JohnMo]

34 minutes ago, Coanda said:

Am I right in thinking, should any condensation form, it will be in the extract

 

Depends did you get a standard or enthalpy heat exchanger.

 

The enthalpy ones recycle the moisture back into the incoming air. So no condensation will accumulate.

[Savage87]

I have a condensate trap (as a collar) on the extract pipe just above the mvhr and another hole at the bottom of the unit. Hope it helps..

[Coanda]

I'm wondering, does any air get sucked in through the condensate drain?

[Roundtuit]

They frequently discharge into the house waste plumbing, so should have a trap on it.

[Conor]

24 minutes ago, Coanda said:

I'm wondering, does any air get sucked in through the condensate drain?

 the water in the trap is enough to stop the "sucking". 

[JackofAll]

On 01/03/2024 at 11:23, Roundtuit said:

They frequently discharge into the house waste plumbing, so should have a trap on it.

Does the condensate pipe need to be 40mm?, was thinking of using overflow pipe and chasing it into the wall in order to get it to a drain in our utility. Don't want to be boxing in. Would over flow pipe work?

[Roundtuit]

Don't see why not, then drop it into a waterless trap in the utility.  The condensate pipe out of my unit is overflow sized; it's only taking a trickle at worst.

[MikeGrahamT21]

Yes absolutely fine, my unit came with  20mm flexible pipe like you get on a dishwasher/washing machine, just drips out