7 Pa. Code § 59a.329
Open-type evaporators or vacuum pans, or both, must be equipped with an automatic condenser water level control, barometric leg, or constructed to prevent water from entering the product, and meet the applicable 3-A Sanitary Standards. When enclosed-type condensers are used, special controls are not needed to prevent water from entering the product.
This section cited in 7 Pa. Code § 59a.326 (relating to equipment and utensils).