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Posted by HeatPro on July 31, 2006 at 11:17:32:
In Reply to: Re: Follow directions if possible posted by Ruth on July 31, 2006 at 10:42:13:
Here is an explanation of 'pump away' and why:
Create a Positive Pressure
Prevent Negative Pressure
NO!!! 'pump-away means pumping away from the boiler and the expansion tank ON THE SUPPLY.
If they are on the return, the relief valve can lift and dump water as the pressure on the pressure side of the pump is POSITIVE and ADDED TO the system pressure when the circulator runs. The boiler relief valve should be on the side of the 'pump away' that doesn't allow the change in pressure.
This is NOT about 'reinventing the wheel' to make it easier for customer and plumber to 'get away' with minimum work AFTER not following the manufacturer's instructions, it is about keeping the system working without damage. If the gauge is wrong CHANGE IT! It is a safety tool to tell you the pressure isn't too high. TOO HIGH is higher than the relief valve at 30 psig, so it is WRONG to leave a bad gauge in the system to let the plumber GET AWAY WITH.
Same page as above:
The Functions of An Expansion Tank
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