Re: OT: Hydronic Home Heating System Losing Water/Pressure - Saab General Bulletin Board - Saabnet.com
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Re: OT: Hydronic Home Heating System Losing Water/Pressure
Posted by AeroEd [Email] (more from AeroEd) on Mon, 14 Oct 2013 09:47:53
In Reply to: OT: Hydronic Home Heating System Losing Water/Pressure, B Millar [Profile/Gallery]
, Mon, 14 Oct 2013 08:01:04
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As Dean pointed out, with the pressure gauge in the lower level (2-story, not in basement, right?), with the pump off and the system cool, you should still be measuring the "head" of water to the highest filled portion of the system.
How are you refilling, if not through the automatic fill? As others said, the fill valve should be continuously open, and it just has a pressure reducing valve that controls the actual flow. When pressure in the system is less than the reducing valve setpoint, it allows flow. When the pressure in the system is greater, there should be backflow prevention to this fill point to prevent water "backflowing" into the house potable system. You can get away with simple double check valve type, but reduced pressure principle backflows are better. They do sometimes "spit" in normal operation, so you have to provide drain funnels for them.
The air valve attached to the scoop (air separator) could be manual or automatic. If the later, it would be normal to only have water squirt when manually activated.
The expansion tank off the air scoop is a diaphram type, with water on top, air on the bottom. You could try to check if that diaphram is leaking, and thus the tank is waterlogged, perhaps by tapping for different sound, or when the system in running, maybe the upper portion is warmer than lower?
IF there's no backflow prevention, and IF that connection to the system allows a slight backflow, you could be slowly draining the system (when off), hopefully just to your washing machine.
Ed
2007 9-5 Aero SC [60th]
2004 9-3 Aero
2005 9-5 Aero
2005 9-5 Arc
2002 9-5 Aero SW (taken out by Bambi)
1999 9-5 SE(6) SW (brief interim between the '02 and the '07)
1999 9-5 SE(4) (taken out by daughter on icy road)
Posts in this Thread:
- OT: Hydronic Home Heating System Losing Water/Pressure, B Millar , Mon, 14 Oct 2013 08:01:04
- Update., B Millar , Tue, 15 Oct 2013 10:45:37
- Re: OT: Hydronic Home Heating System Losing Water/Pressure, Bill Homer , Mon, 14 Oct 2013 10:54:33
- Re: OT: Hydronic Home Heating System Losing Water/Pressure, AeroEd, Mon, 14 Oct 2013 09:47:53 <-- Viewing This Message
- Re: OT: Hydronic Home Heating System Losing Water/Pressure, dmz789qqq, Mon, 14 Oct 2013 09:06:24
- Re: OT: Hydronic Home Heating System Losing Water/Pressure, Dean, Mon, 14 Oct 2013 08:39:52
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