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Paul1977

5047 posts

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#272244 16-Jun-2020 11:24
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Following up from my more general thread about condensate drainage, I now have some very specific questions:

 

We are having a PEAD-M125JAA installed. The outdoor unit is a PUZ-ZM125VKA-A.TH and is to be located in a concreted utility area (the concrete has not yet been poured).

 

I can't find any diagrams or dimensions showing drainage hole(s) for the outdoor unit, and haven't yet had a lot of joy getting the info from the installer - except that they have multiple drainage points.

 

I have found specs for the UK model PUZ-ZM125VKA.UK

 

 

If I'm reading this correctly (and assuming the NZ model is the same) it looks like there are 5 drain holes.

 

1. Am I correct that these units have 5 drain holes?

 

2. If so, is there a way to do some sort of soak pit to capture the drainage from all 5 drain holes?

 

3. Does anyone have access to the specs/service manual of the NZ model so I can confirm the dimensions and placement of holes are the same as the above diagram

 

4. How are others who have these units draining the condensate?

 

Any help or advise would be greatly appreciated (especially from owners or installers of Mitsubishi PEAD ducted systems)

 

Thanks





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Paul1977

5047 posts

Uber Geek


  #2506685 17-Jun-2020 14:38
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Froglotion:

 

I don't have that unit.

 

But what i'd suggest doing is just digging a hole under where the heatpump is going, fill it with stones and put a 40mm waste pipe into it. Have the 40mm waste come up under the heatpump against the wall. They can run a flexible conduit from the unit to that drain. The unit will sit on feet that will allow enough fall from anywhere on the bottom of the unit, to get to the drain. 2c

 

 

This is a similar approach to one of the suggestions the installer had.

 

But he thought create a rebate in the concrete slightly larger than the unit, with a soak pit in it. The heat pump sits in the rebate so no matter where the condensate comes from it can't get past the edge of the rebate. The concrete would be sloped to direct the water into the soak pit. Fill the soak pit and the entire rebate with stones level to the finished (higher) surrounding concrete.

 

His other suggestion was put it in steel brackets attached to the side of the foundation with an unconcreted area beneath it filled with stones.

 

Have started a new thread specifically about advantages/disadvantages of outdoor heat pump units on brackets vs a concrete pad.


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