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, Mon, 14 Oct 2013 08:01:04
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Where is the over pressure relief valve and where does that discharge to? Can that be routed to a bucket or 1 gal bottle to be monitored?
If the accumulator air volume was lost, when the system then heated up, the pressures could be excessive, the low when cooled down. The accumulator air pressure will match the system pressure when things are in a normal condition. However, when system has lost fluid and the pressure is low, the accumulator diaphragm will fill the total volume and it should then still have pressure. So at zero system pressure, the accumulator should still have pressure. You should be able to check that with a tire pressure gauge. You need to find out what the accumulator air pressure should be when the system pressure is zero. For a water pump service the pressure would be higher than for a 12psi service. At 12PSI, the water needs to be able to compress the air so the accumulator can accumulate some water. If this is a water service accumulator and the pressure had never been reduced, it would not work as an accumulator, but would act to prevent high pressures as the water volume expands on heat.
If you have a 12PSI auto-filler that is not working, that is a well defined problem and there may be two faults.
Note that 34 feet of water pressure is 14.7 PSI. If you had water up to the top floor and zero pressure there, there would still be around 7 PSI on the gauge. Zero pressure implies zero water height above the gauge. If the accumulator is not working right, the contracting water when the system is cool could pull a negative pressure.
Found something and linked.
The water valve to the pressure reducing valve should normally be kept open. One could close the valve to check system integrity. One could close the valve to hide a problem.
posted by 108.207.11...
http://homerepair.about.com/od/heatingcoolingrepair/ss/boier_exp_tank_3.htm
, Mon, 14 Oct 2013 08:01:04, Tue, 15 Oct 2013 10:45:37
, Mon, 14 Oct 2013 10:54:33, Mon, 14 Oct 2013 11:28:18, Mon, 14 Oct 2013 11:16:49
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