Nu-Heat

[armb]

The Nu-Heat engineer came this morning as promised here (the visit is free, but we had to wait until an engineer was in the area).I emerged from my sickbed for long enough to show him around, and then largely left him to poke at pipes and take water samples by himself. We're getting a report. He did tell us that one of the pumps should probably be replaced (actually both should, but we can use the too small one on the boiler circuit to replace the same-sized steel-and-should-be-bronze one on the heating circuit). Also confirmed that the duplicate thermostats are as redundant as I thought on the new cylinders - the old cyclinders had two at different levels, but the new tanks have two bosses at the same level just so you have a choice of which to use, but both thermostats got transferred over when the cylinders were replaced (but we found that both are now broken on the rear cylinder).
And apparently the new style hoses are compatible with radiators, but the rubber sort we have encourage radiators that share water with them to rust. Though since radiators run hotter than the underfloor heating, putting them on the same circuit would be non-trivial anyway. We could lay new hoses on top of the chipboard upstairs, losing an inch of room height (and trimming the bottom of the doors, and relaying all the carpets), but downstairs we would have to take up the floors (or lose the nice wood floors, and raising floor height for the external doors would be tricky too). I think if it comes to taking up the floors or changing to radiators, we'll go for radiators (and probably throughout, rather than just downstairs), but we still hope neither will be necessary.

Then we had another leak this evening, which I've half-fixed, probably, and will sort properly in the morning. "I know you are hungry, but I have something more urgent to do" is a phrase which apparently doesn't translate into Cat.

Comments

[grey-lady.livejournal.com]

"I know you are hungry, but I have something more urgent to do"
As Cat evolved around the concept that there is nothing more urgent than food, the phrase simply doesn't exist.

leaking uhf

[(Anonymous)]

Hi sounds like you have a bit of a 'mare, have you tried reducing the pressure & or the water temperature in the system to slightly reduce the stress on the pipes & maybe keep the system on 24/7 (reduces the movement in the pipes caused by expansion & contratcion) with all the ports on the manifold open.
I have recently changed a gate valve off one of the manifolds & 3 self bleed vents for a cliet only to find that the minor disturbance caused by the system being drained, the contration & expansion of the system being de-commisioned, then re-commisioned & now running at the correct pressure has caused other valves to weep & one port of the manifold to leak. I advised the client to replace all 11 remaining valves which showed deterioration before re filling but they chose not to as they were currently not leaking. Other engineers had serviced the boiler prior to my visit to remedy the noise & lack of heating on the first floor. (this is a 3 storey house with basement with 6 manifolds & 3 S.B.V's)without checking the system (the S.B.Vs were corroded, letting in air & weeping) so they simply serviced the boiler, increased the temperature to 75 deg C & turned the pump speed up 2 speeds. I have since reduced the boiler temperature to 48 C & the pump speed to the designed setting & reduced the pressure by .2bar. this has stopped the leaks, improved the economy of the boiler (as it is on 24/7 keeping the manifolds up to temp)& quietened all noise! I hope this may help. good luck. Scootdude