Vapors above the coils are more likely to diffuse out as they warm up, and they are more likely to be carried out by drafts or by parts being withdrawn. Lower the condenser temperature. Sprays can augment vapor degreasing by physically loosening or removing tough soils. However, sprays can also reduce or eliminate the rinsing of parts with clean solvent, which is the fundamental advantage of the vapor degreaser. Cold sprays temporarily destroy the vapor blanket causing the unit to stop functioning as a vapor degreaser.
Hot sprays warm the parts quickly, so they stop condensing vapor sooner.
The choice is between longer and more complex cleaning cycles, or the possibility that inadequate or variable cleaning may occur. Minimize the use of sprays, and keep sprays at temperatures near the boiling point. Eliminating solvent sprays inside a degreaser will result in 30-50 percent less solvent emissions than if sprays are used. Sprays increase emissions by inducing drafts inside the degreaser. The spray stream itself carries air or vapor along with it.