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Old 09-04-2020, 10:34 AM   #46
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Re: How/Where To Purchase Equipment?


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Originally Posted by KKlouzal View Post
I would prefer at this point to put in Daikin equipment, I have always liked the brand name over all others but specifications and performance should always outweigh any brand name bias.

Daikin supplies single-port branch boxes (BSQ_T)
Where as Mitsubishi only has multi-port branch boxes.
This is a win for Daikin in my book.

Looking at the engineering manuals, these commercial heat recovery units can turn down all the way to 11% RELQ72TATJA
The Mitsubishi PURY-EP72TNU-A can only reach 15%

This is another win for Daikin and their larger units can turn down even lower.

The one specification where Mitsubishi takes the win is minimum connectable capacity. The Mitsubishi unit has a minimum connected capacity of 50% where as the Daikin is 70%.

This means with the Daikin system I will have to oversize one of my heads to reach the 70% minimum capacity but since the turndown ratio is so low this wont matter one bit. I also live in Arizona where we can see average temperatures over 115 degrees so having a little extra BTU available can come in handy during the hottest time of the year.

Still though, it doesn't seem very likely that I can even obtain the equipment.
That equipment you highlighted is 3 phase only. Which puts it out of reach of most residential electrical systems.
The smaller residential style are available in single phase.
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Old 09-04-2020, 12:49 PM   #47
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Re: How/Where To Purchase Equipment?


I would use a digital phase converter like this PT010 from Phase Technologies to obtain 3 phase electricity at my location. Maybe not this unit specifically but the technology exists. Overcoming the 3 phase issue was one of the first steps in planning this project.

I realize I probably wont be able to get my hands on this equipment and will need to go with the smaller residential style units but if by some miracle I do find a way then this will be quite a fun project!
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Old 09-04-2020, 04:49 PM   #48
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Re: How/Where To Purchase Equipment?


No idea why you would want to buy a branch selector box for each indoor unit. Mitsi has it down pack. 1 branch box can take care of 12 indoor units.
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Old 09-05-2020, 09:14 AM   #49
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Re: How/Where To Purchase Equipment?


Not saying that I would purchase a selector box for each unit, just having that type of a branch box available is a plus though. I have one head unit far away from all the others, in that scenario I would use the single selector, the rest will work off of a single multi-port selector.

On a side note, I think I found an overseas supplier on Alibaba.

They seem legit and after having a conversation with one of their representatives the company seems very knowledgeable and trustworthy. Shipping will cost an arm and a leg though.
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Old 09-05-2020, 09:19 AM   #50
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Re: How/Where To Purchase Equipment?


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Not saying that I would purchase a selector box for each unit, just having that type of a branch box available is a plus though..
Well....not really.
You install the system once....until it runs out of useful life.
Then you do it again.

If you are in the business of selling and installing these units then it is great to have the selection of equipment that you are wanting.
But a DIY situation requires the right equipment ONCE, the right installation ONCE and it's over.
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Old 09-05-2020, 09:43 AM   #51
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Re: How/Where To Purchase Equipment?


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Originally Posted by KKlouzal View Post
Not saying that I would purchase a selector box for each unit, just having that type of a branch box available is a plus though. I have one head unit far away from all the others, in that scenario I would use the single selector, the rest will work off of a single multi-port selector.

On a side note, I think I found an overseas supplier on Alibaba.

They seem legit and after having a conversation with one of their representatives the company seems very knowledgeable and trustworthy. Shipping will cost an arm and a leg though.



Is it more than 60 foot from the selector box? Mitsi has it covered.


And unlike other manufacturers, mitsi's website is open to all. Including DIYers. Can download any and all manuals and tech bulletins.
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Old 09-05-2020, 09:54 AM   #52
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Re: How/Where To Purchase Equipment?


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Is it more than 60 foot from the selector box? Mitsi has it covered.


And unlike other manufacturers, mitsi's website is open to all. Including DIYers. Can download any and all manuals and tech bulletins.
Absolutely. And itís a very good site.

https://mylinkdrive.com/
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