bezda
Junior Member
Posts: 15 
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Post by bezda on Jun 13, 2017 20:56:42 GMT
Hi,
I've replaced my old water pump with a newer model and got one with higher cut-off pressure (3.8 bar). Unfortunately I didn't realise that calorifier had ~3 bar pressure relief valve.
Is it safe to replace the valve with 4 or 5 bar model or do I need to get new calorifier as well?
Unfortunately there's no label and no information on the calorifier
Thanks!
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Deleted
Deleted Member
Posts: 0
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Post by Deleted on Jun 13, 2017 21:01:13 GMT
Hello  It might be possible to turn down the pressure on the pump somehow. I don't know if its possible on all pumps but would be worth looking into as replacing the calorifier seems a bit extreme ! |
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Deleted
Deleted Member
Posts: 0
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Post by Deleted on Jun 13, 2017 21:23:59 GMT
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Post by JohnV on Jun 13, 2017 21:44:40 GMT
^^^^^^^^^^ all the above in spades!!! ignore at your peril And welcome to Thunderboat , the abode of sweary, chip shouldered , bigoted weirdos  |
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Post by Telemachus on Jun 13, 2017 22:06:41 GMT
3.8 bar is pretty high for an average calorifier. Take the best route - fit a pump of the correct pressure rather than trying to bodge things with the wrong pump. Of course if you can turn down the pressure of the pump you now have, then fine.
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Post by Gone on Jun 13, 2017 22:36:15 GMT
If you pressure cycle the calorifier to a higher pressure than it's design intent then the metal will fatigue and crack. Obviously the greater the excess pressure the shorter the life. I would check with the calorifier maker before increasing the pressure.
If you want to reduce the pressure of your new pump and it is not easy or possible to adjust it down then you could fit a separate pressure switch to turn the pump off at a lower pressure.
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Post by tonyb on Jun 14, 2017 6:06:52 GMT
Personally I would fit an external pressure switch and rewire the pump to bypass the internal one. Although adjustment of the internal one will do their longevity is open to question so an external one makes sense.
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