In a typical Air Heating Coil piping configuration, traps are used to handle condensate and air. What are the effects of air in a coil?
1.Excess Steam Pressure
The answer is…
Cold Spots AND Water Hammer
Cold spots are formed when pockets are air are trapped in the coil, creating a decrease in heating efficiency.
Air can also trap pockets of condensate that move through the coil as “slugs”, causing water hammer.
To remove air, Thermostatic Air Vents are typically installed on the coil outlet.
Float and Thermostatic Traps are also used on the coil discharge. F&T traps are always the first choice for modulating variable pressure coils.