Panasonic vs Mitsubishi ducted heat pump and ventilation solutions

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247 posts

Master Geek

#3340839 9-Feb-2025 20:40

tweake:

whats the damper fitting into? the damper looks like its a tad smaller diameter. it looks like they are filling a big gap with the tape.

That's for a bedroom supply.

AlDrag

247 posts

Master Geek

#3340841 9-Feb-2025 20:42

tweake:

the hole, bit of duct tape will fix that. i would fix it asap. thats probably the return side so once filter clogs up its probably going to be sucking dirty hot air in.

Right. I can duct tape it now.

Strangely I checked my lossnay filters today. Zero evidence of any dust at all. Maybe the bypass doesn't touch those filters, since they are for the core. Idk. I really need to get that lossnay controller (installer is trying to find one for me), because I have a feeling it's always bypassing the core.

tweake

2391 posts

Uber Geek

#3340852 9-Feb-2025 21:31

AlDrag:

Strangely I checked my lossnay filters today. Zero evidence of any dust at all. Maybe the bypass doesn't touch those filters, since they are for the core. Idk. I really need to get that lossnay controller (installer is trying to find one for me), because I have a feeling it's always bypassing the core.

it should take a long time to get dirt in the filters. also this is why you have a separate main filter and not rely on the core filters.

i did see your lossnay is wired to the heat pump. i'll have to check the manual but i think it should be programmed from the heat pump controller.

AlDrag

247 posts

Master Geek

#3340853 9-Feb-2025 21:37

tweake:

it should take a long time to get dirt in the filters. also this is why you have a separate main filter and not rely on the core filters.

i did see your lossnay is wired to the heat pump. i'll have to check the manual but i think it should be programmed from the heat pump controller.

Right. That's good to know. And I guess my intake being on the top of a 2 storey home probably means there is less particulates.

My lossnay is the lgh-25. I wonder if that's slightly too big for this pead 50 heatpump. The fans are really loud in the attic. Maybe far too much fresh air for it to handle. But maybe that's normal.

Yea actually the heatpump controller should do, as that can control lossnay also I think. I really need one, even just plugged in in the attic, because I don't think the dip switches really give me any configuration options for what I need (lossnay fan speed and bypass damper). Maybe I can ask some aircon companies if they have any spares they want to give away.

AlDrag

247 posts

Master Geek

#3340854 9-Feb-2025 21:50

Ugh and should I complain about this also? This duct joint is completely uninsulated? Is that normal? That join is really cold to the touch. But would it make much difference to be worth remedying?

tweake

2391 posts

Uber Geek

#3341191 10-Feb-2025 16:58

weird for a joiner. most joiners i've used you can pull on the duct right up to the center. that insulates it as well. its usually 3 way joins or dampers that are tricky but they often come with their own insulation.

unfortunately i don't know what the air temps typically are for ducted heat pumps. normally with aircon you always want ducts insulated, not because of efficiency but rather to avoid condensation on the ducts. you don't want condensation dripping onto the ceiling.

tweake

2391 posts

Uber Geek

#3341193 10-Feb-2025 17:07

AlDrag:

My lossnay is the lgh-25. I wonder if that's slightly too big for this pead 50 heatpump. The fans are really loud in the attic. Maybe far too much fresh air for it to handle. But maybe that's normal.

Yea actually the heatpump controller should do, as that can control lossnay also I think. I really need one, even just plugged in in the attic, because I don't think the dip switches really give me any configuration options for what I need (lossnay fan speed and bypass damper). Maybe I can ask some aircon companies if they have any spares they want to give away.

no such thing as an erv that to big for the heat pump. heat pumps flow massive amounts more air than any erv would.

if i remember right the dip switches give basic functions but a lot of the stuff is programmed from the controller. things like fan speed should already be set as you need to set the erv flow rate for the size of the house (or half house if you didn't put that downstairs vent in). you really need a flow meter to get it dialed in, which the installers should have done. with mitsi they have 3 ventilation flow settings the user can select on the controller, each one of those needs to be programmed in.

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AlDrag

247 posts

Master Geek

#3341195 10-Feb-2025 17:14

tweake:

no such thing as an erv that to big for the heat pump. heat pumps flow massive amounts more air than any erv would.

if i remember right the dip switches give basic functions but a lot of the stuff is programmed from the controller. things like fan speed should already be set as you need to set the erv flow rate for the size of the house (or half house if you didn't put that downstairs vent in). you really need a flow meter to get it dialed in, which the installers should have done. with mitsi they have 3 ventilation flow settings the user can select on the controller, each one of those needs to be programmed in.

Hmmm strange. Last night, I turned off the ERV at the mains in the attic and left the heatpump running. The heatpump was very quiet, almost silent, but the lossnay on the other hand is super loud. Fans buzzing fast!

Maybe when the Lossnay is paired with the PEAD unit, the Lossnay is what provides the airflow, which I guess would make sense? I'll ask the installer this.

Pretty sure these guys never used a flow meter hahaha. Or maybe they did, idk.

tweake

2391 posts

Uber Geek

#3341203 10-Feb-2025 17:43

an erv should never be loud. loud typically indicates a restriction. check they took the filters out of the bag!

measuring the flows/velocity in/out of the erv will tell you if one side has a restriction, eg from the return grills (i assume installed in the bath room) and also the bathroom doors. use the dip switch plus control panel settings to adjust the motors speeds to get equal flows.

AlDrag

247 posts

Master Geek

#3341206 10-Feb-2025 17:54

tweake:

an erv should never be loud. loud typically indicates a restriction. check they took the filters out of the bag!

measuring the flows/velocity in/out of the erv will tell you if one side has a restriction, eg from the return grills (i assume installed in the bath room) and also the bathroom doors. use the dip switch plus control panel settings to adjust the motors speeds to get equal flows.

Right....ok, I will analyse it more. It seems most of the noise might be from where the fresh air leaves the Lossnay to connect to the heatpump, maybe because of the bend in the duct, although I tried making it straighter and the sound didn't change.

Filters had no bags on them. The only filters are the ones touching the 2 cores right?

There's no return grills besides the one in the main return.

Reading the manual, I don't think any of those dip switches affect the motor speeds unfortunately. Options seem limited.

tweake

2391 posts

Uber Geek

#3341209 10-Feb-2025 18:11

AlDrag:

There's no return grills besides the one in the main return.

explain please ! ! ! how have they got the erv plumbed?

AlDrag

247 posts

Master Geek

#3341210 10-Feb-2025 18:13

tweake:

explain please ! ! ! how have they got the erv plumbed?

So I have a central return in the hallway. Inside this central return there is 1 massive duct for the aircon and a tiny one for the ERV. Confirmed this by checking where the duct went.

I can take a picture if it's helpful.

Edit: The tiny erv one is exhaust for the erv.

tweake

2391 posts

Uber Geek

#3341223 10-Feb-2025 19:09

AlDrag:

So I have a central return in the hallway. Inside this central return there is 1 massive duct for the aircon and a tiny one for the ERV. Confirmed this by checking where the duct went.

I can take a picture if it's helpful.

Edit: The tiny erv one is exhaust for the erv.

where does the erv fresh air side go to?

AlDrag

247 posts

Master Geek

#3341224 10-Feb-2025 19:25

tweake:

where does the erv fresh air side go to?

From my understanding by looking at the ducts, the fresh air goes into the ERV then out directly to the heatpump unit.
The return air goes from a small duct connected to the main return and into the lossnay unit then to the outside.

Looking at this diagram on my unit, it seeeems to be accurate on how it was installed.

tweake

2391 posts

Uber Geek

#3341225 10-Feb-2025 19:37

AlDrag:

From my understanding by looking at the ducts, the fresh air goes into the ERV then out directly to the heatpump unit.

where on the heat pump unit does it go? on the return side or the outlet (air to bedrooms) side.

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