Background:
A month and a half ago my Glow-worm boiler made that banging sound and cut out like described so many times on this site, using previous comments here I determined it was my pump that had packed in. I removed it from the system (thank god for those valves above and below the pump) and determined that it was indeed seized up as much as a pump could possible seize. Off to plumb centre I went and picked up a shiny new Grundfos Alpha + 15/60 pump. I installed it and restarted the system (the instruction manual said the pump is self-venting so I didn't vent it).
Sure enough everything started up fine and the central heating and hot water became fully operational again, yay!
The problem:
Ever since I did this, the pump emits a rattling sound once it heats up / is heated up. This is rather loud and very annoying. I'm pretty sure it's not trapped air or anything like that and my only though is that it could be a duff bearing, does this sound likely?
The sound changes if I place the pump at variable speed at the "dot", but I don't think it works as well then, I get a lot of expansion and contraction in the pipes if I do this.
I have an mp3 of the sound but nowhere to post it to, I could email it to anyone interested I guess
Second question:
What is the pipe in the background here, the one with the red valve on it:
Third question:
How do I determine a good setting for the pump speed and boiler setting, am wasting a lot of energy if I put the boiler to 5 and pump to full power? I could only assume this causes the house to heat up to the desired temperature quicker...
Hopefully someone can help...[/img]
A month and a half ago my Glow-worm boiler made that banging sound and cut out like described so many times on this site, using previous comments here I determined it was my pump that had packed in. I removed it from the system (thank god for those valves above and below the pump) and determined that it was indeed seized up as much as a pump could possible seize. Off to plumb centre I went and picked up a shiny new Grundfos Alpha + 15/60 pump. I installed it and restarted the system (the instruction manual said the pump is self-venting so I didn't vent it).
Sure enough everything started up fine and the central heating and hot water became fully operational again, yay!
The problem:
Ever since I did this, the pump emits a rattling sound once it heats up / is heated up. This is rather loud and very annoying. I'm pretty sure it's not trapped air or anything like that and my only though is that it could be a duff bearing, does this sound likely?
The sound changes if I place the pump at variable speed at the "dot", but I don't think it works as well then, I get a lot of expansion and contraction in the pipes if I do this.
I have an mp3 of the sound but nowhere to post it to, I could email it to anyone interested I guess
Second question:
What is the pipe in the background here, the one with the red valve on it:
Third question:
How do I determine a good setting for the pump speed and boiler setting, am wasting a lot of energy if I put the boiler to 5 and pump to full power? I could only assume this causes the house to heat up to the desired temperature quicker...
Hopefully someone can help...[/img]
