UL 921:2016 pdf download.Commercial Dishwashers.
3.18 Multi-flame pilot burner- A pilot burner that produces a single flame with variation in contour underminimum pilot conditions.
3.19 Operational maintenance - Any operation，accessible without the use of tools，that can beperformed by other than authorized maintenance personnel for the equipment.The following servicefunctions which require the use of tools to perform are not considered operational maintenance:
a) resetting of overload devices and primary safety controls;
b) repeated adjustment of timers; and
c)replacement of fuses.
3.20 Permanently connected dishwasher - A dishwasher that is connected to the electrical supply bymeans of conduit,armored cable, or non-metallic sheathed cable.
3.21 Pilot- A gas flame utilized to ignite the gas at a main burner.
3.22 Pressure-relief device- A pressure-actuated valve or rupture member constructed to automaticallyrelieve pressures above normal operating pressures.
3.23 Pressure-relief valve- A pressure-actuated valve held closed by a spring or other means andconstructed to automatically relieve pressure in excess of its setting.
3.24 Recessed dishwasher- A dishwasher that is intended:
a) to be supported by the floor;
b) to rest against a wall in the rear;
c) to rest against a wall, a cabinet, or another dishwasher on one side; andd) to rest against a cabinet or another dishwasher on the other side.
Installation configurations include a countertop covering the dishwasher and the adjacent cabinets andappliances. A recessed dishwasher is not intended for permanent attachment to the building structure orto adjacent cabinets or dishwashers.
