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

 

[rpm]

Seperate pump feeding water to the shower and did you move the pump as well?

 

[Andy mcgill]

Seperate pump feeding water to the shower and did you move the pump as well?

No mate pressure comes from head of cold tank.Shower has a pump on it.

 

[king of pipes]

Sounds like it is piped wrong you should have independent supplies for the shower pump feeds as attached . Kop

 

[rpm]

Don`t disagree there is something wrong bud, however unless I`m wrong it is a box on the wall, no seperate pump this time.

 

[king of pipes]

Aquastream type shower ? It Will still need a Essex type flange for the hot feed and separate cold from CWS tank. Not shared . Kop

 

[Andy mcgill]

Aquastream type shower ? It Will still need a Essex type flange for the hot feed and separate cold from CWS tank. Not shared . Kop

The shower is a Newteam.The problem is worse this morning.Low flow on the hot taps until you switch the shower on to bleed the system.Think I will order an air vent and try it on top of the cylinder

 

[ChippyCal]

Bleed the system, install vent, and renew / clean pump.

 

[Aire]

What's the distance between the top of the shower and the bottom of the cold water storage tank in the loft?

 

[Riley]

You dont need an air vent you most likely need the correct flange as mentioned before

 

[Aire]

OP, can you take photos of the installation, a pic of the cylinder and where you have taken you hot supply from and a pic of your cold water supply too please.

 

[ChippyCal]

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

Just a thought reading this, is HOT and COLD connected the right way around?

 

[Andy mcgill]

What's the distance between the top of the shower and the bottom of the cold water storage tank in the loft?

View attachment 37195

Distance is 1.2 meters

 

[Andy mcgill]

Just a thought reading this, is HOT and COLD connected the right way around?

Hot and cold are definitely correct.

 

[Andy mcgill]

You dont need an air vent you most likely need the correct flange as mentioned before

What is the correct flange bearing in Mind-this installation was done in 1984 and all I have changed over the years is the fitting of the shower and moving of the tank a few days ago

 

[Riley]

Give us some pics and we’ll check

 

[Andy mcgill]

Give us some pics and we’ll check

Pics of cylinder and shower

 

[ShaunCorbs]

Where’s the vent as atm the cylinder isn’t vented

 

[Andy mcgill]

Where’s the vent as atm the cylinder isn’t vented

That's the point.The hot water pipe exits the cylinder and goes up to the cold tank where it hangs over the edge of the tank. The hot taps are tee,d off this pipe. Can I put an air valve in the short pipe exiting the tank?

 

[ChippyCal]

=

 

[Best]

Who did that work!!!!
Pipe from top of cylinder always needs a vent of it.
That has no chance of working

 

[Aire]

You need to tee off here and vent this pipe into the cold tank in the loft

 

[ShaunCorbs]

That's the point the hot water pipe exits the cylinder and goes up to the cold tank where it hangs over the edge of the tank. The hot taps are tee,d off this pipe. Can I put an air valve in the short pipe exiting the tank?

Wrong think you should get the person back who did the work

 

[Riley]

Totally agree. Verging on being dangerous

 

[Harvest Fields]

Needs sorting and to me would be a priority. Get them back ASAP.