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"Condensate
traps exhibit many failure modes that can impact on indoor air
quality. Trap failures due to freeze-up, drying out, breakage,
blockage, and/or improper installation can compromise the seal
against air ingestion through the condensate drain line. Traps with
insufficient height between the inlet and outlet on draw-through
systems can cause the drain to back-up when the fan is on, possibly
causing drain pan overflow or water droplet carryover into the duct
system. The resulting moist surfaces can become sources of
biological contamination. Seasonal variations, such as very dry or
cold weather, may adversely affect trap operation and condensate
removal." |