|
Normal operating temperature which is around 140º F for the old cast iron raditors and 180º F for newer fin tube type radiators.
If your 2nd floor radiators are only getting half full then the pressure has to be as low as 5 or 6 PSI.
Either that or the pipe feeding them is stopped up but if that was the case, air would not be sucking back in.
Kinda sounds like you may have two peoblems, an auto feed valve that's corroded and not allowing water to pass through and a pressure gauge that's not giving a true pressure reading.
I would first determin how acurate the pressure gauge reading is by going to a local plumbing supply house or hardware store and getting a pressure gauge that screws onto a hose bib (screws on just like a garden hose)
Screw the gauge onto the boiler drain and open the drain valve to check the pressure.
While you're there getting the gauge you better also get a BRASS hose cap because many times when you open an old boiler drain it will not completely close again and you'll need the brass cap to stop it from dripping.
|