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How do I add water to my home radiator system while bleeding the air out?
Wiki User
∙ 12y ago
At you boiler, near your expansion tank, is a pressure reducing valve that puts water into the system automatically. The PRV should be set to maintain a pressure 4 psig more than the height of the system. i.e.
PSIguage = (height of system x .43 PSIg / ft) + 4 psig
i.e = ( 24 ' from fill point to top of system * .43 psi / ft) + 4
= 10.3 + 4 = 14.4 psig (set point of automatic makeup water valve)
FYI: PRV valves normally come set at 12 psig out of the box.
The fact you need to bleed air would lead me to believe that either your PRV set point is not high enough to keep air out the system, or your pump is located upstream of you makeup water point (pumping to the makeup water point) rather than pumping away from it.
Wiki User
∙ 12y ago
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