Bob has it right below. Purpose of trap in condensate drain like that is to prevent flow of air either into or out of the AHU/furnace. Depth of trap is determined by the fan static pressure, too shallow and the fan can either blow or suck the trap dry. Sewer gas is not an issue since a drain of this type should not be directly connected to a sewer. The trap also needs to be a prescribed distance below the unit again depending on fan pressure. Link below gives a pretty quick overview for those really interested.
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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