Not able to add water to Boiler

Old 12-26-09, 11:11 AM
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Not able to add water to Boiler

I am working with a Dunkirk PVWB-50 boiler. I bleed the end of line radiator and the pressure dropped from about 15 PSI to about 7 PSI. I can not figure out how to add more water to get the pressure back up.

I have posted images of the system and would appreciate any feedback.

Image on posted here.

Old 12-26-09, 11:53 AM
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Miles, in one of your pictures we can partially see the expansion tank. The label on that tank says FILL TROL. This indicates that you have a system that allows water into the system based on the air pressure in the expansion tank.

If the expansion tank is low on air, so will the water pressure in the boiler be low.

If you have a bicycle pump, or a small air compressor, you need to add air to the tire valve on the bottom of the FILL TROL tank. If you pump the tank up to 12-15 PSI, you should see the pressure in the boiler follow this. Add the air SLOWLY if you use a compressor, it is very easy to get too much air in the small tank!

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