I have a hot water boiler that has zero pressure, the cold water fill valve turned off, and air in the pipes (hearing periodic gurgling in the pipes and water circulates through the baseboard radiant units). There are two drains built into the piping connected to the boiler. One drain is connected to the supply zone manifold and one drain connected to the return piping near the circulation pump. When I open the cold water fill valve to raise the pressure in the system a the vent outlet on the fill valve drips a bit.
My questions are:
1) can I plug the vent on the fill valve to prevent dripping while I pressurize the system and keep it plugged, or is that a bad idea? I'm not totally clear what function that vent serves.
2) after opening the fill vale to introduce pressure to the system, which drain do I open to purge air from the system? The drain on the zone manifold or the drain connected to the return near the circulation pump?
My questions are:
1) can I plug the vent on the fill valve to prevent dripping while I pressurize the system and keep it plugged, or is that a bad idea? I'm not totally clear what function that vent serves.
2) after opening the fill vale to introduce pressure to the system, which drain do I open to purge air from the system? The drain on the zone manifold or the drain connected to the return near the circulation pump?
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