Advice please on "trickling" pump noise

[chrisb]

Hello all,
I am not a professional but would very much appreciate any advice offered on a new system installed.
I had a professional fit a Yeoman Boiler Stove linking my sealed Gas Fired Central heating using a Systemlink Heat Genie. The Stove is capable of 11Kw to the water and the Heat Genie is their 15Kw model. I am very pleased with the system and the safety aspects of the Heat Genie.
The Pump on the Stove to the Heat Genie circuit, located on the side of the fire breast on the Return is a Lowara Ecocirc 25-6/130 and has been bled of air, the system also has an Auto Air Vent up top which having been bled was closed off.
The system works 100% fine when cold or warm BUT when the stove reaches operating temp. there is a distinct sound from the “pump area” akin to water trickling. Like a tap trickling. When the system cools, the trickling sound stops. I assume if there was air in the system it would affect it, hot or cold ? It cannot be bled any more than it has been.
If this is a normal phenomenon so be it, I will just get used to it but I am just concerned that I may be storing up problems for when I get even older, perish the thought! Will this do long term damage ?
I would really appreciate the voice of experience and thank any professional that would take the time to reply.

Thanking you in anticipation.
Chris B

 

[Dotty]

Open the auto air vent.

 

[1Bomber1]

Pump cavitation, check angle of pump head, pump setting (too high). Is the pump 'pumping' downwards. Vents in the right area (are they taken off the vertical or horizontal pipe work?) Try a larger tee and larger pipe work leading to the air vent. Have you got a adative cocktail ie has it been chemically flushed and cleaned flushed again with water before adative added.
I could go on boring you but I have given you a starter for ten.
regards
Bomber

 

[chrisb]

Many thanks for swift replies.
I had the Auto vent open for several hours after the system was bled, no difference. Was advised ( rightly or wrongly ) to close it in case it was drawing in air at that point, which is at the highest point of the system, in the attic. The pump is fitted on a vertical pipe, it is drawing down on the return and pushing around 2 x 90 deg elbows into the bottom of the boiler stove. The system was filled and Fernox added on initial installation.
Do you think it is ok to leave it or will this cause future problems..it is actually operating ok apart from this "trickling"
Again, thanks for replies lads.
Chris