Sorry for being pretty off topic but haven’t been able to find too much for my issue searching and basements are a very foreign thing around here making so there are no local experts. Since I know a lot of guys here have basement game rooms thought someone here might have some experience in this dept.
Our house has a semi-finished basement which I am prepping to more fully finish into our game room. The basement houses our two downstairs hvac units and water heaters (hydronic heat ugh) and right by these are floor drains. Our basement is fully underground and below any city sewer so the floor drains lead to the sump pit where it gets pumped... well not yet sure where it goes in the end.
Anyway... recently I noticed water filling one of the floor drains and draining very slow. Upon removing the grate and shop vacing out some water I saw a very small side hole and a large plug in the bottom. The plug was not on tight and removing it the rest of the water drained away right away.
From my research the side hole is typically a cleanout but its the one that should have a plug and this has no threads so I’m super confused. A. Why would there be a plug on the main drain and B why would anyone plug it? C. Could that side hole actually be an auxiliary inlet? The AC condensation line goes into the wall that side inlet is also pointing towards.
My theory at the moment is that the previous homeowner had no idea what they were doing and plugged the drains?