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Kickinbac: I’ve found a technical manual for a Lossnay ERV and there are some explanations of what is happening with the relative humidity through the ERV heat exchanger and comparing with HRV and conventional ventilation.
If you can work a psychrometric chart the calculations can be done to work out what is happening under different conditions.
This is also a diagram I found super helpful to understand the differences.
The example seems pretty accurate for Auckland weather too, although the winters are usually 5degrees at the lowest.
But the thing I keep forgetting about is "absolute" humidity instead of relative. 85% rh to me sounded high at 0degrees, but obviously it holds a lot less water at that temperature, thus the HRV humidity in winter is too low.
tweake:
the drain is there for when the airflow on one side is cold and the other side is damp and it gets condensation in the core. eg cold winter morning, very cold incoming air and someone takes a shower. moisture from shower goes through, hits the cold core and condensates a bit. or house is airconditioned extremely cold and very humid outside air, humidity will condense. but its a real stretch to claim "it reduces humidity".
erv/hrv filters should not need to be changed much because the incoming air should have its own separate filter (did they leave that out of the quote?) its the return side that should get dirty the most and that depends on how clean your house is. they are only there to protect the core, so they are a low grade filter. its a modern salesman thing to try and use that filter to clean the air, which causes restriction and sometimes a non-standard size (you have to buy their filters).
I completely forgot about the separate filter box. Will see if I still have time to get a quote for that.
This is the filter procedure for the Lossnay ERV I'm getting https://www.mitsubishi-electric.co.nz/materials/ventilation/manuals/lossnay/lgh-rvx-e/1_operation/how-to-clean-your-filter-core-lgh-rvx.pdf
One big difference I've noticed with Lossnay HRV vs ERV, is that their HRV models seem way more consumer designed. Filters are way easier to access etc. The ERV seems a little more involved, like having a screw to open is a bit silly, but it's fine. The Lossnay ERV models also just have solely commercial marketing vs the HRV with residential marketing.
This is something the BDT guy agreed with.
Also to contradict what he stated, about how ERV is cheaper than HRV, based on reading online, that doesn't seem to be the case.....but maybe it just is with Mitsubishi. Their HRV models do "look" flasher.
Trusted
AlDrag:
So in Auckland you definitely want the right column imo, lower humidity in summer and not to low (dry eyes/throat) humidity in winter.
AlDrag:
Kickinbac:
The paper core is coated in a waxy type finish. It’s not just paper and is durable.
I put a Lossnay in my parents house about 11-12 years ago, same time I did my own house that I have since sold. I replaced their HRV positive pressure system that they despised as they still had moisture on their windows and thought the filter replacement cost was extortionate! No complaints of moisture on windows since.
I clean the filters for them about every 4-6 months and have removed the core a few times to inspect it out of interest. The core is clean and good condition after all these years. It runs fine and never had a fault and they are happy with it.
It’s the only Lossnay system I’ve been able to monitor long term.
That's fantastic to hear and gives me a lot more confidence! Thanks!
Have you ever replaced the filters? Seems you're supposed to every 1/2 years. But I can't find anywhere to buy them online annoyingly.
No, I haven't replaced the filters, probably should after all this time.
Yes, it is a shame they can't be bought online. To get spare filters, order them through any Mitsubishi Electric AC dealer, give them the model and serial number.
If you clean/wash them regularly, they supposed to be replaced every 2 years.1 year for high efficiency filters.
Don't ever wash the ERV paper core! Just vacuum it if dirty. The HRV cores can be washed.
Instructions for LGH-RVX model below. I can get these for other models if you need them but all are similar.
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