T
tm plumbing
Yip that means more big bore iron out the plant room, can't be a bad thing.
double regulating valves yeh
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Light Commercial Boiler Reviews
- Thread starter tm plumbing
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Yip that means more big bore iron out the plant room, can't be a bad thing.
double regulating valves yeh
E
Ermintrude
Yep sure is .
H
happyflyer
Will you guys tell me how you intend to set up the DRVs please I would love to know, hold th'and onto F/R,
Gate valves have served us well on domestic for the last 60 years, why all of a sudden is UPK going commercial using DRV, WB went a bit over-board on their LLH drawing me thinks.
Gate valves have served us well on domestic for the last 60 years, why all of a sudden is UPK going commercial using DRV, WB went a bit over-board on their LLH drawing me thinks.
E
Ermintrude
U be using my "sonex" ultra sonic mass flow rate calculator coupled with my hot tube differential gauge.
E
Ermintrude
I've got to go back a replace. 5 28mm altech gate valves on a school used for balancing the gland nuts don't thread on properly and it looks a mess as they are weeping when hot
H
happyflyer
Photos please Ermi, I can't upload any photos any more just get URL link only what am I doing wrong?
Nothing. It's a system-wide problem. Someone has turned off "add attachments". It's been reported but, so far, nothing has benn done about it.
H
happyflyer
thanks doit thought it was me
T
tm plumbing
it's been a while since this job so thought i'd update -
The sealed side with the LLH is working fine, on the OV side there's 3 heating zones, the largest of which is dying on me when the other 2 are on at same time they are each served with a 15/60 so it's off with zone 1 pump tomorrow and in goes a Ups2 32-80 so i'm hoping with a bit of balncing i'll get even distribution. i'll update how it goes
The sealed side with the LLH is working fine, on the OV side there's 3 heating zones, the largest of which is dying on me when the other 2 are on at same time they are each served with a 15/60 so it's off with zone 1 pump tomorrow and in goes a Ups2 32-80 so i'm hoping with a bit of balncing i'll get even distribution. i'll update how it goes
Nice and neat, personally would of used lever valves (although supposes it depends on budget) . Also why are the pumps in the first picture facing up? Thought that was bad for them.
T
tm plumbing
I don't mind the gate valves to be honest can be useful to help balance.
also the pumps are ok as long as the shaft is either horizontal or slightly higher to eliminate air ( according to Grundfos PDFs anyway) see below -
The new pump works better but the manifold pipe work setup I have is no good so back tomorrow to re do a bit of pipework and have the three heating zones teed off the HX horizontal flow outlet direct up into each zone valve with a new valve on each to adjust flows. Picking up the expansion too.
At the moment it only wants to flow on 1st zone only due to pipework, altering it should hopefully be more even. Fingers crossed !!
Where pumps are installed in horizontal pipework, ensure that the pump shaft is also horizontalor slightly higher at the vent plug end. This reduces thrust bearing load and ensures positive airpurging from both the rotor chamber and impeller housing.
also the pumps are ok as long as the shaft is either horizontal or slightly higher to eliminate air ( according to Grundfos PDFs anyway) see below -
The new pump works better but the manifold pipe work setup I have is no good so back tomorrow to re do a bit of pipework and have the three heating zones teed off the HX horizontal flow outlet direct up into each zone valve with a new valve on each to adjust flows. Picking up the expansion too.
At the moment it only wants to flow on 1st zone only due to pipework, altering it should hopefully be more even. Fingers crossed !!
Where pumps are installed in horizontal pipework, ensure that the pump shaft is also horizontalor slightly higher at the vent plug end. This reduces thrust bearing load and ensures positive airpurging from both the rotor chamber and impeller housing.
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