Banging noise from megaflow system

[Richard101]

Hi
First time post, looking for some advice please. My hot water system has started making a clunk clunk noise it's quite frequent and "clunk's twice ". It seems to be coming from where the red valve ( in pic ) . I think it's a release valve ( not sure) . Also the guage seems quite high not sure how to lower the pressure so black needle matches the red one .
I

have attached some photos and any advice would be greatly appreciated thanks

 

[king of pipes]

The cylinder is plumbed up wrong you will need a G3 qualified engineer to sort it out

 

[SJB060685]

Looks like the installer has used bottom right gate valve as an easy drain point through discharge, can't see combined temperature and pressure relief valve discharge though

 

[Richard101]

Looks like the installer has used bottom right gate valve as an easy drain point through discharge, can't see combined temperature and pressure relief valve discharge though

Many thanks for your input I will get it checked out asap thanks for taking the time to respond