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2862 posts

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# 258656 15-Oct-2019 11:12
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We're building a new house and are going with a Mitsubishi Ducted Heat Pump and Lossnay.

 

I'm just thinking what happens if they ever need replacing, how to get them out of the roof space and get replacements in.

 

I don't think the ducted heat pump would be too much of an issue as once the plenums come off it should fit through the trusses to get the components to the access over the garage.

 

But can the Lossnay be disassembled at all?

 

If not, could anything ever happen to it that would require it to be completely removed and replaced?





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  # 2337367 15-Oct-2019 12:36
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How about putting in good attic stairs like the Sellawood. You can get a lot out through one of those hatches. We had one put in when we had our bathroom redone, including putting the hot water cylinder in the ceiling.

 

Keep in mind one of these is basically a big hole in the insulation and would cool your house significantly if you didn't cater for that. We have a lowered ceiling so we ended up with this in the lower ceiling, then basically build an insulated box with hydraulic struts that fully insulates it. In most cases a simple cover hatch is sufficient - Google for it. Sellawood might sell something that does the job.




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  # 2337384 15-Oct-2019 12:54
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timmmay:

 

How about putting in good attic stairs like the Sellawood. You can get a lot out through one of those hatches. We had one put in when we had our bathroom redone, including putting the hot water cylinder in the ceiling.

 

Keep in mind one of these is basically a big hole in the insulation and would cool your house significantly if you didn't cater for that. We have a lowered ceiling so we ended up with this in the lower ceiling, then basically build an insulated box with hydraulic struts that fully insulates it. In most cases a simple cover hatch is sufficient - Google for it. Sellawood might sell something that does the job.

 

 

We'll have those in the garage, and should be big enough to fit the units through if ever required. However, it's not possible to put one of these in a position that has direct access to the Heat Pump or Lossnay though.

 

So the problem would be getting it from it's installation position to the hatch in the garage.

 

If I wanted a clear path I'd have to put in 6 additional attic trusses, but I don't want to go to this expense if I don't have to.

 

Do most people cater for this, or am I overthinking it?


 
 
 
 


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  # 2337389 15-Oct-2019 13:00
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All mechanical systems fail eventually, and Lossnay filters may need to be cleaned. I think you're right to be considering this in advance.

 

I also find the attic a good place to store things. Put down some particle board with a bit of a rim at the edge, buy some plastic boxes, put stuff up there.


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  # 2337428 15-Oct-2019 14:17
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Worst case I guess you just cut a hole in the ceiling to get it down and patch it up after the fix, I imagine repairs on the units can be done in situ without taking the while thing out though, something i've wondered about but it hasn't had a brake down yet. (we just have the heat pump is the lossnay a bigger unit?)


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  # 2337430 15-Oct-2019 14:21
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From the Lossnay manual

 

To keep the Lossnay functions in good condition IRUDORQJWLPHFOHDQGLUWRUGXVWIURPWKH¿OWHUVperiodically (at least once every six month or more frequently depending on the operating environment). Clean dirt or dust in the Drain pan (supply air side) periodically (at least once every six month or more frequently depending on the operating environment)

 

I think you need easy access to the Lossnay.




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  # 2337492 15-Oct-2019 16:04
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timmmay:

 

From the Lossnay manual

 

To keep the Lossnay functions in good condition IRUDORQJWLPHFOHDQGLUWRUGXVWIURPWKH¿OWHUVperiodically (at least once every six month or more frequently depending on the operating environment). Clean dirt or dust in the Drain pan (supply air side) periodically (at least once every six month or more frequently depending on the operating environment)

 

I think you need easy access to the Lossnay.

 

 

Getting a person to it wouldn't be a problem. It's whether it ever needed to be outright replaced for some reason.




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  # 2337496 15-Oct-2019 16:12
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WaffleMakerMan:

 

Worst case I guess you just cut a hole in the ceiling to get it down and patch it up after the fix, I imagine repairs on the units can be done in situ without taking the while thing out though, something i've wondered about but it hasn't had a brake down yet. (we just have the heat pump is the lossnay a bigger unit?)

 

 

The heat pump will break down into 3 parts (heat pump, supply plenum, return plenum). When it's coupled together it's huge, but manageable when broken down. The Lossnay is overall smaller, but just one piece as far as I can tell.

 

You're right, worst case is cutting a hole in the ceiling. I guess it's a question of spending a bit extra now to avoid the off chance of spending more later.


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