Advice regarding central heating pressure… (old system)

[diyclown]

Hello,

This is not exactly an appliance question but maybe someone can offer some advice. I bled the radiators recently and now the pressure reading is 0 (it should be 1.5). As a result the radiators are not getting fully hot especially upstairs. I cannot remember how to increase the pressure again.

https://postimg.cc/N5kp2F08

In this pic you can see a small black switch or valve just under the grey washing machine hose. Is it this I use ?

or

https://postimg.cc/k25FVyz9

In this pic you can see the expansion vessel and pressure gauge. I was thinking it might be the red cap above the gauge that I use? If so how do I use it? Direction etc ?

I seem to remember it was one of these the heating guy used when I was shown along time ago.

I’d really appreciate any help you can offer.

Thanks very much.

[electrofix]

I would turn this tap and see what happens. if it does start to rise do not let it get above 1.5. I would let it get to just over 1 and see what happens from there

Dave

[diyclown]

Thanks for your reply. I assume this adds water to the system does it?

[electrofix]

correct but its important to only add enough and not too much and do not leave the tap turned on under any circumstances

Dave

[diyclown]

OK Dave. I’ll give it a try hopefully later today. Thanks.

[diyclown]

Sorry I’ve not replied sooner. I managed to add some water using the black tap as you suggested. All seems to be OK at the moment. Thanks very much for the help.

[Author]

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