single pipe heating system problems

[Tom.davenport12]

i am having problems getting heat to 5 new rads on a single pipe system. the customer supplied drayton trv4's with then and already had 10mm pipe going to the 22mm single pipe. on connecting and heating up its bypassing the new rads. is there any good way around this? i have read that special designed trvs do help but worried the 10mm runs are to small bore to carry the heat. thanks

 

[Dotty]

10mm won't work. You need 15mm and large bore TRVs as you've already guessed.

 

[Chalked]

Hi
Sould be a 22mm loop, with 15 to rads

 

[Chalked]

Hi
Sould be a 22mm loop, with 15 to rads

 

[stani]

Trv's are Danfoss RA-G either 15, 20or 25

 

[SPC]

The radiators also need to be very close too the loop, swept tees are often used to help direct the flow to the rads too

 

[Tom.davenport12]

thanks everyone time to upset his first fixing or try to run a return around