Vent problems after tank move

[Andy mcgill]

Hello everyone, this is my first post.
I am having problems with my upstairs hot water taps first thing in the morning.
The system is an open vent with a cold storage tank in the loft and a direct hot cylinder on the first floor.
The problem started about 5 years ago when I extended my bathroom and fitted a gravity feed power shower. First thing in the morning when you switched the shower to eco, the pump would race for 30 seconds as if it was drawing air. This was not really a problem until the last day when I decided to move the hot cylinder to the front porch to free up the sitting room cupboard,which would allow me to take down the wall. The move added about 4 meters of pipe on the cold feed and the same on the hot take off.
After the move the shower has no water at it and I have to run the bath tap and sink tap to bleed out the air.This gets water to the shower.
So I have just examined the system and I think the air is being trapped when the tank is heated during the night.
The vent pipe is wrong I think,because the hot 22 mm pipe comes off the top of the tank goes up to the toilet and then up to the cold tank to vent.The hot taps are tee,ed off in the bathroom and not at the tank.
I don't want to totally repipe the vent so thought about installing an air vent valve on the hot leg as it leaves the tank.
Don't know if all this makes sense but I would like your thoughts.
Thanks

 

[Andy mcgill]

Also good swerve on the issue with the plastic

All my house has been done in plastic.
Are you telling me this is not fit for purpose.

 

[Riley]

They can’t deal with the temp should your cylinder overheat likewise your vent pipe needs to be correctly reinstalled in copper. Who re-pipes it all in plastic?

 

[Riley]

Please stop ignoring the vent issue too we are thinking of your safety here. If you have moved the cylinder yourself then you really really needed to have a clue on what the pipes actually do. The vent pipe is not just for getting air out of the system and needs to be correctly plumbed to cope with any safety failures.

 

[Andy mcgill]

They can’t deal with the temp should your cylinder overheat likewise your vent pipe needs to be correctly reinstalled in copper. Who re-pipes it all in plastic?

Tank is fitted with a 6 bolt howden which has one control thermostat and an over-temperature safety thromostat for protection,this complies with the current IEE REGULATIONS TO BS7671.If you had read the post correctly the pipe runs up to the cold tank which means if both stats fail and the tank over heats the superheated water will flow into the cold tank in the loft.THE HOT WATER IS TEE,D OFF THIS VERTICAL dare l say it VENT pipe.

 

[ShaunCorbs]

 

[Riley]

Point is it shouldn’t be it should be a continuous copper pipe to above the cwsc with no draw offs. The way yours is piped currently it’ll be lucky if it gets past the first bit ofplastic when the water boils. Please don’t get the arse just because you’re being told it’s wrong. It’s called learning we all had/have to do it. Remember it is you who has come for advice, free of charge I might add, and are now not liking the fact that you are being told the correct professional response

 

[ShaunCorbs]

doesnt matter needs to be done correctly end of

thread closed