The pressure gauge shows that the pressure is below 0.8 bar. The instruction says that the pressure should be increased by filling the system with water. Can any of you tell me how to do it?

the manual (or rather, a reprint of it that I got from the previous owner), contains only this short fragment in the subject

Hello, look for the water release knob under the boiler, if you are not sure if it allows you to put a photo of it on the post, if you do not want to take photos, just ask your uncle google about: Ariston Clas 24/28 user manual

Added after 37 : Here's a picture - I'll be grateful for your help (it's getting cold ).

You shoot water to the boiler with this blue knob, unscrew it gently, check the pressure on the pressure gauge all the time, when it is right you turn it off and it's ready

the bastard won't budge ... I pull this blue cork down, try to turn it either way but to no avail (I put quite a lot of effort into it). The pressure in the rest state - 0.5, after turning on the hot water, it increases to around 1.1. What is this pressure too low and what is the possible risk of it?

Then you have to pressurize the expansion tank - it is located at the back of the boiler.But first, you close all the taps under the boiler and drain the water from the boiler. You increase the pressure to 0.8 bar, unscrew the taps under the boiler and top up the pressure on the pressure gauge with water. You vent the boiler and pump and it's ready. But you have to deal with that filling tap.

Ariston Clas 24/28: Increasing Pressure Below 0.8 Bar by Filling System with Water

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#1 12816371 06 Oct 2013 20:47

tazzio tazzio

Level 2

» |

Post #1
12816371 06 Oct 2013 20:47

The pressure gauge shows that the pressure is below 0.8 bar.

The instruction says that the pressure should be increased by filling the system with water.

Can any of you tell me how to do it?
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#2 12816466 06 Oct 2013 21:06

ryszard233 ryszard233

Level 12

» | Positive voted Helpful post? (+17)

Post #2
12816466 06 Oct 2013 21:06

instruction......
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#3 12816599 06 Oct 2013 21:32

tazzio tazzio

Level 2

» | Topic author Positive voted Helpful post? (+8)

Post #3
12816599 06 Oct 2013 21:32

the manual (or rather, a reprint of it that I got from the previous owner), contains only this short fragment in the subject
#4 12816863 06 Oct 2013 22:37

W0jtek92 W0jtek92

Level 38

» | Positive voted Helpful post? (+9)

Post #4
12816863 06 Oct 2013 22:37

Hello, look for the water release knob under the boiler, if you are not sure if it allows you to put a photo of it on the post, if you do not want to take photos, just ask your uncle google about: Ariston Clas 24/28 user manual "
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#5 12822233 08 Oct 2013 17:26

tazzio tazzio

Level 2

» | Topic author Positive voted Helpful post? (+8)

Post #5
12822233 08 Oct 2013 17:26

Added after 37 [seconds]:

Here's a picture - I'll be grateful for your help (it's getting cold ).
#6 12822702 08 Oct 2013 19:33

grzesiek234 grzesiek234

Heating systems specialist

» | Positive voted Helpful post? (+12)

Post #6
12822702 08 Oct 2013 19:33

You shoot water to the boiler with this blue knob, unscrew it gently, check the pressure on the pressure gauge all the time, when it is right you turn it off and it's ready
#7 12822827 08 Oct 2013 20:01

tazzio tazzio

Level 2

» | Topic author Positive voted Helpful post? (+14)

Post #7
12822827 08 Oct 2013 20:01

the bastard won't budge ... I pull this blue cork down, try to turn it either way but to no avail (I put quite a lot of effort into it).

The pressure in the "rest" state - 0.5, after turning on the hot water, it increases to around 1.1.

What is this pressure too low and what is the possible risk of it?
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#8 12822923 08 Oct 2013 20:19

grzesiek234 grzesiek234

Heating systems specialist

» | Positive voted Helpful post? (+13)

Post #8
12822923 08 Oct 2013 20:19

Then you have to pressurize the expansion tank - it is located at the back of the boiler.But first, you close all the taps under the boiler and drain the water from the boiler. You increase the pressure to 0.8 bar, unscrew the taps under the boiler and top up the pressure on the pressure gauge with water. You vent the boiler and pump and it's ready. But you have to deal with that filling tap.
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Topic summary

The discussion revolves around increasing the pressure of the Ariston Clas 24/28 boiler, which is currently below 0.8 bar. Users suggest locating the water release knob under the boiler to fill the system with water. One user mentions difficulties in turning the blue knob to add water, while another advises checking the expansion tank pressure and ensuring all taps are closed before filling. The process involves monitoring the pressure gauge and venting the boiler after filling to achieve the desired pressure level.
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Ariston Clas 24/28: Increasing Pressure Below 0.8 Bar by Filling System with Water

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