Pipe hieroglyphics

[cuneus]

Boiler heating hot water pic below, pipe sizes in blue, abbreviations are hand written on the pipes

HTGF and HTFR = Heating Flow and return
HW = Hot water

any ideas about the rest ?

[TheEnd]

cf- cold feed?
ov- overflow?

[mikR]

PR:- Pressure Relief ?

[Arthur Jackson]

Cold Feed and Open Vent.
PR is the return from the cylinder. No idea what it stands for.

[mikR]

PR:- Pressure Return?

[Rickyy]

Primary Return.

[dickymint]

The big X is where you need to dig!

[cuneus]

Thanks for all the replies

Here is why I wanted to know (work in progress)

http://dmsims.dyndns.org:8000/

[Rickyy]

You don't need to take the cold feed and open vent to the boiler. Common practise is to connect them on the primary flow after the boiler and before the pump. With the open vent being the first tee and the cold feed being the second.

Try to avoid using elbows on the cold feed, they have a tendency to block up.

Also make sure the return from the cylinder (PR) is the last tee before the boiler, if you tee a heating return after it, it can cause the rads to warm up when they are not needed.

[slinky]

cuneus said:

Thanks for all the replies

Here is why I wanted to know (work in progress)

http://dmsims.dyndns.org:8000/

I like it!

[Arthur Jackson]

Rickyy said:

You don't need to take the cold feed and open vent to the boiler. Common practise is to connect them on the primary flow after the boiler and before the pump. With the open vent being the first tee and the cold feed being the second ensuring the tees are no further apart than 150mm.

EFA