![]() ![]() ![]() A water-level detection device conforming to UL 508 shall be installed that will shut off the equipment served in the event that the primary drain is blocked. ![]() The auxiliary drain pan shall be constructed in accordance with Item 1 of this section. The pan shall be equipped with a fitting to allow for drainage. This pan shall be equipped with a water level detection device conforming to UL 508 that will shut off the equipment served prior to overflow of the pan. An auxiliary drain pan without a separate drain line shall be installed under the coils on which condensation will occur.The overflow drain line shall connect to the drain pan at a higher level than the primary drain connection. This overflow drain shall discharge to a conspicuous point of disposal to alert occupants in the event of a stoppage of the primary drain. A separate overflow drain line shall be connected to the drain pan installed with the equipment.Nonmetallic pans shall have a minimum thickness of not less than 0.0625 inch (1.6 mm). Galvanized sheet steel pans shall have a minimum thickness of not less than 0.0236-inch (0.6010 mm) (No. The pan shall have a minimum depth of 1.5 inches (38 mm), shall be not less than 3 inches (76 mm) larger than the unit or the coil dimensions in width and length and shall be constructed of corrosion-resistant material. The auxiliary pan drain shall discharge to a conspicuous point of disposal to alert occupants in the event of a stoppage of the primary drain. An auxiliary drain pan with a separate drain shall be installed under the coils on which condensation will occur.One of the following methods shall be used: Drain piping shall be not less than 3/ 4-inch (19 mm) nominal pipe size. Such piping shall maintain a minimum horizontal slope in the direction of discharge of not less than 1/ 8 unit vertical in 12 units horizontal (1-percent slope). In addition to the requirements of Section M1411.3, a secondary drain or auxiliary drain pan shall be required for each cooling or evaporator coil where damage to any building components will occur as a result of overflow from the equipment drain pan or stoppage in the condensate drain piping. ![]()
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