- Joined
- 8 Sep 2015
- Messages
- 13
- Reaction score
- 0
- Country
Its an oil boiler, heating and hot water, hot water is via a copper cylinder in the hot press, it has an external expansion vessel.
You know when you fill a central heating system via the service valve? Between this valve and the boiler is an expansion vessel. I was always under the impression this should be on the heating return side of the boiler.
Anyway, when the system is cold its been reading 1 or less bar via the gauge ontop of the expansion vessel, lately when hot its been climbing to over 3 bar, I only noticed this because water has been dripping from the warning pipe in the garden.
Today, without the heating being on for a few days, so the system was cold the gauge read 3.5 bar, I opened the red valve to let the pressure out and it sounded like air escaping.
I've got a split diaphragm in the expansion vessel haven't I? I just found it odd that it would climb to 3.5 bar even though the system is cold.
You know when you fill a central heating system via the service valve? Between this valve and the boiler is an expansion vessel. I was always under the impression this should be on the heating return side of the boiler.
Anyway, when the system is cold its been reading 1 or less bar via the gauge ontop of the expansion vessel, lately when hot its been climbing to over 3 bar, I only noticed this because water has been dripping from the warning pipe in the garden.
Today, without the heating being on for a few days, so the system was cold the gauge read 3.5 bar, I opened the red valve to let the pressure out and it sounded like air escaping.
I've got a split diaphragm in the expansion vessel haven't I? I just found it odd that it would climb to 3.5 bar even though the system is cold.