NSF ANSI 29-2017 pdf free download – Detergent and chemical feeders for commercial spray-type dishwashing machines.
This Standard establishes minimum public health and sanitation requirements for chemical sanitizing feeders,detergent feeders, rinse agent feeders, and similar devices for commercial spray-type dishwashing machines.
1.2 Scope
This Standard covers chemical sanitizing feeders,detergent feeders, drying agent feeders,and similardevices that automatically maintain the concentration of additives in the prewash, wash, pumped rinse, or finalrinse of commercial spray-type dishwashing machines.
Equipment components and materials covered under other NSF or NSFIANSI Standards or Criteria shall alsoconform to the requirements therein.
1.3 Alternate materials, design, and construction
While specific materials, design，and construction may be stipulated in this Standard，equipment thatincorporates alternate materials, design, or construction may be acceptable when such equipment meetsintent of the applicable requirements herein.This Standard is not intended to restrict new unit design, providedthat such design meets the minimum specifications described herein.
1.4 Measurement
Decimal and Sl conversions provided parenthetically shall be considered equivalent. Metric conversions andsignificant figure rounding have been made according to lEEE/ASTM SI 10.
2Normative references
The following documents contain provisions that, through reference, constitute provisions of this NSF/ANSIStandard.At the time this Standard was balloted, the editions listed below were valid.All documents aresubject to revision, and parties are encouraged to investigate the possibility of applying the recent editions ofthe documents indicated below.The most recent published edition of the document shall be used for undatedreferences.
IEEE/ASTM SI 10- 2010.American National Standard for Metric Practice3NSF/ANSI 51.Food equipment materials.
3Definitions
Terms used in this Standard that have special technical meaning are defined in NSFIANSl170.
4Materials
The requirements contained in this section are intended to protect food from contamination and ensure thatthe materials used in the manufacture of food service equipment resist wear; penetration by vermin; and theeffects of foods, heat, cleaning compounds, sanitizers, and other substances that may contact the materials inthe intended use environment.
Materials shall conform to the requirements in NSFIANSl 51 applicable to the zone in which the material isused.
5 Design and construction
This section contains design and construction requirements for equipment covered within the scope of thisStandard.
5.1 General
Feeders shall automatically dispense additives to maintain the recommended concentration in the prewash,wash, pumped rinse, or final rinse.
When installed according to the manufacturer’s instructions, the feeder shall prevent uncontrolled siphonageor discharge of chemicals into the prewash, wash, pumped rinse, or final rinse.
5.2 Service
Feeders shall be fabricated to be easily cleaned，maintained,and serviced,and to facilitate chemicalreplenishment in accordance with the manufacturer’s instructions.
5.3 Water and waste connections
The feeder shall be designed to be capable of being installed to comply with applicable codes.
5.4 Provision for mounting
Feeders to be attached to the dishwashing machine cabinet shall conform to one of the followingrequirements:
5.4.1Designed to prevent accumulation of moisture, seepage, and soilin the area around and between thefeeder and mounting surface.
5.4.2Designed to provide a clear, unobstructed space between the feeder and mounting surface to permiteasy cleaning.
5.4.3 Designed to ensure that the area around and between the feeder and mounting surface is easilycleanable.
5.5 Openings
5.5.1Openings shall be located in a position protected from splash, spillage, and overhead drippage.
5.5.2Screening on openings, if provided, shall be 16 mesh (minimum 16 strands per 1.0 in [25 mm])orequivalent and set in a removable sash for easy cleaning.
5.6 Louvers
5.6.1Louvers that may be subject to overhead splashes,spills, and drips shall be of a drip deflectingdesign, or they shall be readily removable and the space immediately behind the louver easily cleanable.
5.6.2lf electrical safety requirements prohibit the use of readily removable louvers, then such louvers needonly be removable.
5.6.3 Louvers shall be free of sharp edges and burrs and shall have spaces large enough to allow for easycleaning.
5.7 Delivery verification
5.7.1 Rinse aid feeders shall be manufactured or equipped to provide an effective indication (visual oraudible, or both) when additive supply is depleted, or when additive is not being delivered to the final rinse.NSF ANSI 29 pdf download.