The drip pan under an attic A/C unit typically drains to the side rather than from the bottom for several reasons:
Gravity: The primary reason for draining the drip pan to the side is to take advantage of gravity. By angling the drain line, the water can flow naturally towards a suitable drainage point without relying on additional pumps or mechanisms. This simplifies the system and reduces the chances of failure.
Condensate Removal: Air conditioning systems produce condensate as a natural byproduct when cooling the air. This condensate collects in the drip pan, which is designed to catch any water that may leak or overflow. By draining to the side, the condensate can be directed away from the A/C unit and potential damage areas.
Serviceability: Having the drain line positioned at the side of the drip pan makes it more accessible for inspection, cleaning, and maintenance. If the drain line were at the bottom, it would be harder to reach and service, requiring additional effort to access and potentially interfering with the unit's functioning.
Protection against Overflow: If the A/C unit experiences a malfunction or a clogged drain line, having the drain line positioned at the side can prevent water from overflowing directly onto the unit or surrounding components. It provides an extra layer of protection against potential water damage.
By draining the drip pan to the side, these design considerations help ensure efficient condensate removal, system reliability, and easy maintenance for attic A/C units.