refnet joint reducer

[sork]

Hi guys, installing a 14kw daikin RZQG140L7V1 , itis one outdoor and twin indoor each 7kw. my question is not about the positioning, my question is : do i need to reduce 5/8 or not, i mean i enter from outdoor with 5/8 to refnet, do i use 5/8 from the refnet to coolers or do i need to reduce the pipe size? same for liquid line? if i do not reduce the refnet becomes evap due to pressure drop at the joint.
any help will be appriciated
Sork

[install monkey]

whatever pipe size is on the outdoor - run that size to your refnet/branch, then for a 7 kw daikin, should be 5/8 3/8 from each branch to each indoor- branch should be ideally equal lengths on each branch- and also have a max of 15mtr total on the branches

[install monkey]

5/8 3/8 (15mm ,10mm pipework on outdoor too)
http://www.daikintech.co.uk/Data/Split-Sky-Air-Outdoor/RZQG-L/2013/RZQG-L8(7)V1B/RZQG-L8(7)V1B_Databook.pdf
page 27 shows pipe layout for a twin

[frank]

Well said Monkey...
And don't forget to only wire the BRC controller to 1of the indoor fan coils otherwise you will get an error.

[sork]

Thanks Monk, greatly appriciated, only limited hours i can be on the site. i only need to keep the distance of the coolers to refnet equal, this is simple enough; then, after the joint i follow the evaporators inlet pipe size.

[sork]

thank you Frank.

[sork]

i have checked the coolers pipe, as you said rightly, it is 5/8 and 3/8 so i connect the refnet 8 metres to each cooler with 5/8 and 3/8 . i have not yet seen the outdoor pipe size. my question is if that is 5/8 and 3/8 same as coolers, from condensing unit to refnet, would not there be a pressure drop? or maybe pipe size of the condensing unit is larger!

[install monkey]

the manual states 5/8 3/8 on the outdoor, all daikin 410 units from 7kw upwards are 5/8 3/8 - so it seems strange but trust me it works,

[sork]

you mean i connect to refnet 5/8 and 3/8 from the condenser? then from refnet to coolers on 5/8 and 3/8 as well? so you think there will be no pressure drop in the refnet? if i keep the distance from the refnet to the cooles the same length?

[Brian_UK]

Also make sure that you mount the refnet correctly.

[sork]

yes horizantal or vertical, in this case twin 7kw coolers , there are no reduction in pipe size enter 5/8 from the condensing unit; leave 5/8 same for discharge line on 3/8. approximatly same distance from the refnet to coolers.

[Williamnoha]

Useful share. Thanks for the helpful information.