Replacing part of a microbore system!

[Latwelve]

Hey all, I live in a 3 story house (mid 90s build) and it benefits from 8mm microbore to the rads...(joys)

I've flushed it god knows how many times and its got inhibitor and new rads on 2 floors but due to cost reasons I couldn't do it all at once.

Now the ground floor has packed up and the first floor has 2 rads that are on their way to stopping working. top floor has 4 rads (2 small) which work fine.

I can quite easily get to the first 2 floors to replace the microbore for 15mm plastic.. my question is.. if I do this will it affect the rads on the top floor? or am I into a the delicacies of balancing the system?


Thanks

 

[Madrab]

the delicacies of balancing the system

Exactly that.

 

[Latwelve]

Exactly that.

bugger - anywhere you'd recommend I can read up on the technicals?

 

[ianmcd]

bugger - anywhere you'd recommend I can read up on the technicals?

lots of posts on here how to to it, just take your time

 

[CBW]

https://www.diynot.com/wiki/Plumbing:faq2

 

[Latwelve]

I mean that sounds pretty easy.. my question was really if there are any absolute red flags to adding 15mm to downstairs whilst leaving microbore upstairs until I can get to it... but if its just standard balancing stuff then I dont see theres a problem right?

 

[Madrab]

No, there isn't any fundamental reason why you cant mix small bore and normal 15mm pipe to the rads