Hi,
I'd like to run this past people with experience before I return a pump.
My old pump was sticking so I've replaced it. It might be older than me as it some standard for 1971 on it Grundfoss 18-60 (yes eighteen).
Gravity hot water, pumped CH,
Feed tank in loft, pump on the cold CH into the boiler.
Water feed is softened.
System is Very old so I used Fernox DS40.
Drained system with opened rad vent valves.
Refilled closing rads as they filled.
Pumped system for 20 minutes.
Drained system with opened rad vent valves again.
Refilled & added Fernox DS40 & ran for a week on the old pump, lots of bleeding rads.
Water colour changed to 'exhausted' & nearly black.
Drained filled pumped for 20 minutes drained.
Kept going till it ran clear but still some magnatite (looks like rough black pepper).
Draining then helped with vacuum on the old pump tube, 28mm.
Quite a bit more magnatite removed.
After many flushes no more large crud just a few tiny specs.
Fitted new pump
Grundfos Alpha2 along with 28mm gate valves.
Filled up & added second load of DS40.
Lots of bleeding rads.
Still not exauhsted after a week.
No particles in the water at all.
Small bit of boiler noise went away, rads hotter than before .
Got ready to drain & add MB1 protector.
Pump has just seized after 7-8 days, Grrrr! .
Opened pump housing rotor is 'pristine' no specs in the water. Still not exausted DS40.
I cannot move the rotor by hand & I'm not going to force it.
Seems like I got a duff one unless I've missed something.
Any ideas, should I be able to return it & get a replacement ?
I can supply pictures if need be.
Chris
~~~~~
I'd like to run this past people with experience before I return a pump.
My old pump was sticking so I've replaced it. It might be older than me as it some standard for 1971 on it Grundfoss 18-60 (yes eighteen).
Gravity hot water, pumped CH,
Feed tank in loft, pump on the cold CH into the boiler.
Water feed is softened.
System is Very old so I used Fernox DS40.
Drained system with opened rad vent valves.
Refilled closing rads as they filled.
Pumped system for 20 minutes.
Drained system with opened rad vent valves again.
Refilled & added Fernox DS40 & ran for a week on the old pump, lots of bleeding rads.
Water colour changed to 'exhausted' & nearly black.
Drained filled pumped for 20 minutes drained.
Kept going till it ran clear but still some magnatite (looks like rough black pepper).
Draining then helped with vacuum on the old pump tube, 28mm.
Quite a bit more magnatite removed.
After many flushes no more large crud just a few tiny specs.
Fitted new pump
Grundfos Alpha2 along with 28mm gate valves.
Filled up & added second load of DS40.
Lots of bleeding rads.
Still not exauhsted after a week.
No particles in the water at all.
Small bit of boiler noise went away, rads hotter than before .
Got ready to drain & add MB1 protector.
Pump has just seized after 7-8 days, Grrrr! .
Opened pump housing rotor is 'pristine' no specs in the water. Still not exausted DS40.
I cannot move the rotor by hand & I'm not going to force it.
Seems like I got a duff one unless I've missed something.
Any ideas, should I be able to return it & get a replacement ?
I can supply pictures if need be.
Chris
~~~~~