Trickling Sound Inside Premier Tribune Hot Water Tank

[alba2]

I have a pressurised ch/hw system with a white expansion vessel above a
Premier Tribune Hot Water Tank and a red expansion vessel below.
When either the hw or ch is on there is a constant trickling/dripping sound inside the Premier Tribune hot water tank.
When both ch and hw is switched off the trickling sound stops.
Is this normal? If not what can I do to rectify it?

 

[newbuildinstaller]

sounds like the PRV/TPRV is passing when the hot water is expanding when heated.

Check the black plastic tundish to see if water is flowing through. If it is then you cant fix it and need a plumber with a G3 ticket as its a dangerous set up in the wrong hands

 

[alba2]

Thanks for your reply.

No water coming through the tundish. It is absolutely dry.

 

[jeff the gasman]

Could be air in the primary coil

 

[alba2]

How do I bleed air from the primary coil?

 

[alba2]

I am now hearing constant running water within the hot water tank. It is no longer just a drip drip.

The ch is working fine all around the house and we are getting plenty hot water.

The tundish is not dripping at all and there is no water coming out of any of the outside discharge pipes.

What is going on? Is it difficult for a ch expert to diagnose?

 

[alba2]

I am still hoping for a helpful response to my posting.

However, the fact that we continue to have a fully functioning hw &ch system, does that mean that hearing the constant dripping and sometimes running water sound only whilst the system is on is normal?