I have two separate questions that are related
1. I have a hot water heater that they just put a pan under it in order to get a cert of occupancy to sell the house to me. They ran 1" PVC from the pan through a hole in the floor into the crawlspace, where the pipe just dangles. So if any water ever leaked into the pan, it would just get dumped into my crawlspace. About 10" horizontally away from this dangling pipe is a 2" PVC drain pipe that drains the washing machine into the main drain line. This 2" PCV pipe runs 1" under the 9" joists, so there is about 10" of vertical clearance between the pipe and the floor. If there is any vent or trap, it must be within the wall, because i don't see anything visible, but I assume that whatever needed to be done is done. Circa 1985.
Can I put a 'y' or 'T' into the 2" horizontal PVC and connect the stub pipe directly into the drain? Does it need a trap (even though the trap would obviously be dry all the time)? The washing machine standpipe is open, so I doubt any additional venting would be required.
2. I also want to put a dehumidifier in the crawlspace with a condensation pump. How do I connect the discharge from the pump into the 2" PVC pipe? Do I use another 'Y' or 't'? Do I need a trap? Can I seal it in, or can I create an open standpipe, wider than the discharge tubing, so to speak, and just let the discharge tube feed into the pipe, similar to the washing machine? Or better yet, can I just cut a hole into the 1" PVC pipe coming from the hot water heater pan, insert the tube, and silicone caulk it in? That would be easiest.
All ideas appreciated.