[Equest-users] 4-pipe IU

[Dakota Kelley]

Verena,

 

If we’re looking at the same thing, I think the system schematic view might be hard-coded to say “2-pipe coil”.  Regardless, it should behave as a 4-pipe IU if you create separate HW and CHW loops and assign both to the IU.  If you’re using v3.63, immediately below the 2-pipe label it shows separate heating and cooling coils as expected for a 4-pipe system.  The two loops will operate independently to maintain space temperatures.

 

To verify, you can compare your set up to the example template for a 4-pipe system:

 

·         Search for “Four-Pipe” in Help

·         Choose the search result “SYSTEM Type = IU”

·         On the right side of the window, scroll down to the bottom of the help content and you’ll see a link labeled “Input template for a standard 2- and 4-pipe IU unit”.  

 

You’ll note that a 2-pipe IU would require a single loop created specifically as TYPE = PIPE-2.  The same loop would then be designated as the IU’s cooling and heating loop.  It is my understanding that creating two separate heating and cooling loops, without specifying them as 2-PIPE, and assigning both to your IU makes it a 4-pipe.

 

Thanks,

 

                                

                         DAKOTA KELLEY                                                              

                                Project Designer

 

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From: Verena Kindl [mailto:kindl at scholze.de] 
Sent: Friday, August 14, 2009 3:07 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] 4-pipe IU

 

Hi,

 

i finally model my system as an induction unit with a 4 pipe coil. As it is not possible in the wizard I do it in the detailed edit. But even I choose for the loop always the CHW / HW and not the 2 pipe option I always see a 2 pipe coil on the screen. How can I activate the 4 pipe coil ? 

 

Thanks Verena

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