Johntheo5's latest activity
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JJohntheo5 replied to the thread Bypass valve.Didn't "get" your Sat post until about 2 hours ago. OK, first thing is, regarding re pump pressure rise against a closed valve, all...
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JJohntheo5 replied to the thread New radiator not getting hot.Do these tests with the boiler running, if the rad return is teed back into the main flow, then, when testing with the TRV shut and...
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JJohntheo5 replied to the thread New radiator not getting hot.It's possible that it's installed inadvertently as a "one pipe" system, shut off both rad valves then open the vent fully, open the...
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JJohntheo5 replied to the thread Pumped shower will not start - airlocks.Yours should look like the attached, (if a Surrey flange). Take a photo if possible, and post.
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JJohntheo5 replied to the thread Pumped shower will not start - airlocks.If a Surrey flange then the HW is taken from the side and the vent is on the top. If a Warix type then the HW is taken from the Top and...
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JJohntheo5 replied to the thread Bypass valve.They shouldn't pass anything if shut, not even 0.2LPM, what's the point otherwise?, you may as well have that gate valve suggested above.
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JJohntheo5 replied to the thread Bypass valve.Have you got a actual pressure gauge for doing these tests?, if so, then run the tests by measuring the flowrates at different pressures...
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JJohntheo5 replied to the thread Bypass valve.The DU144, according to AI, is Drop Tight.
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JJohntheo5 replied to the thread Bypass valve.Using the first pump map of 150mb...... The pump head at 50% speed and even using a 800mb pump = 800x0.5^2, 200mb, a new HEX loss at...
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JJohntheo5 replied to the thread Bypass valve.Take all the readings, same as in post #101, please.
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JThank you once again John. Presumably the set flow temperature is immaterial for these tests, which I will do as you suggest? I have...
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JJohntheo5 replied to the thread Bypass valve.I don't know how (or if) the calculation for residual head is done to give the proper pump speed/output but quite easy to calculate the...
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JJohntheo5 replied to the thread Vaillant Boiler not igniting - S.97 F.75.When you start the boiler normally then you should see the pressure gauge rise by around o.2/0.3bar, if it does, then possibly a faulty...
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JI guess the fact that I used a WB accredited installer and that gives me the 12-year warranty, means they will sort any issues with the...
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JJohntheo5 replied to the thread Bypass valve.Big improvement with new HEX but again, same as other WB with a new HEX, a 3C dT between Target/Flow temps. Burner cuts out at...
