Commercial dishwasher installations · 2018-05-29 · commercial dishwashing machines must discharge: 1) indirectly to the drainage system through an air gap, or 2) directly to the

MINNESOTA RULES, CHAPTER 4714, SECTIONS 414.3 AND 704.3

COMMERCIAL DISHWASHING MACHINES MUST DISCHARGE: 1) INDIRECTLY TO THE DRAINAGE SYSTEM THROUGH AN AIR GAP, OR 2) DIRECTLY TO THE DRAINAGE SYSTEM WITH A FLOOR DRAIN CONSTRUCTED WITHOUT A BACKWATER VALVE INSTALLED ON

THE HORIZONTAL DISHWASHER BRANCH AND LOCATED ADJACENT TO THE DISHWASHER.

THE WATER SUPPLY CONNECTION TO A COMMERCIAL DISHWASHING MACHINE MUST BE PROTECTED BY AN AIR GAP OR A BACKFLOW PREVENTION DEVICE IN ACCORDANCE WITH SECTIONS 603.3.2, 603.3.5, OR 603.3.6 (SEE MINNESOTA RULES, CHAPTER 4714, SECTION 414.2).

1' 1' I I DISHWASHERDIRECT CONNECTION I I I I

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FLOOR DRAIN WITHOUT ~ /BACKWATER VALVE~ t-

1' 1' I IDISHWASHER INDIRECT CONNECTION DISHWASHERI I I I

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Al R GAP .....1....1-+-I -~ I I I

AIR GAP I

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THE FLOOD LEVEL RIM OF THE RECEPTOR MUST BE BELOW THE ~~ FLOOR DRAIN, FLOOR SINK, OR BOTTOM OF THE DISHWASHER \ / _} TRENCH DRAIN

STANDPIPE

ii DEPARTMENT OFI LABOR AND INDUSTRY

1/18Commercial Dishwasher Installations Telephone: (651) 284-5063 www.dli.mn.gov/ccld/planplumbing.asp