Do you recommend capping stand pipes that are attached to traps from packaged or split system AC units? If so why?
If not why not?
Should the cap be installed to a stand pipe prior to the trap or after the trap?
just curious
It depends how the coil is installed. If it is a draw through coil an open vent is needed between the trap and coil otherwise it won’t drain because of the suction pressure on the drain opening. If it is a blow through coil it will drain without a vent because of the positive pressure.