ASTM F858-24

Standard Specification for Hot Water Sanitizing Commercial Dishwashing Machines, Single Tank, Conveyor Rack Type

ABSTRACT
This specification covers single tank, automatic rack type, hot water sanitizing commercial dishwashing machines. Covered by this specification are dishwashing machines of various types (Types I and II based on feed direction, from right or left, respectively), styles (Styles 1-3 based on method of heating: steam, electric, or gas), classes (Classes A-D based on heat source: injector, heat exchange coil, natural gas, or LP gas), sizes, and capacities. Components comprising the dishwashing machine shall be manufactured from corrosion-resistant steel (tank, scrap trays or strainers, overflow drain, access door/s, and legs), corrosion-resisting materials (conveyor, piping and fittings, valves, and spray assemblies), nickel-copper alloys, and plastics. Pump casings shall be of cast iron or corrosion-resisting material. When specified, the dishwashing machine assembly may include a final rinse booster, detergent feeder, and rinse agent feeder. The dishwashing machine shall be tested for performance standards compliance and noise level as well as for operational, leakage, and performance profile requirements. All tests shall comply with the requirements specified.
SCOPE
1.1 This specification covers single tank, automatic rack conveyor type, commercial dishwashing machines.  
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-Jan-2024
• ICS: 97.040.40 - Dishwashers
• Technical Committee: F26 - Food Service Equipment
• Drafting Committee: F26.01 - Cleaning and Sanitation Equipment

Relations

• Replaces: ASTM F858-18 - Standard Specification for Hot Water Sanitizing Commercial Dishwashing Machines, Single Tank, Conveyor Rack Type
• Effective Date: 01-Feb-2024
• Referred By: ASTM F1920-20 - Standard Test Method for Performance of Rack Conveyor Commercial Dishwashing Machines
• Effective Date: 01-Feb-2024

Overview

ASTM F858-24 is the internationally recognized standard specification developed by ASTM International for hot water sanitizing commercial dishwashing machines-specifically, single tank, conveyor rack type models. This standard defines the construction, materials, performance, and testing requirements to ensure these machines consistently deliver hygienic results in commercial and institutional food service operations. By adhering to ASTM F858-24, manufacturers, facility managers, and purchasing agents can select dishwashing equipment that meets stringent safety, sanitation, durability, and performance criteria applicable globally.

Key Topics

• Scope and Classification

  • Applies to single tank, automatic rack conveyor type, hot water sanitizing commercial dishwashers.
  • Defines machine types by feed direction (right or left), heating method (steam, electric, or gas), heat source (injector, heat exchanger, natural or LP gas), as well as capacity groups.

• Materials and Construction

  • Requires use of corrosion-resistant materials, including 300 series stainless steel, nickel-copper alloys, and specific plastics.
  • Components like tanks, trays, doors, legs, conveyors, valves, and spray assemblies must be built for long-term reliability and hygiene.

• Design and Safety Features

  • Mandates features such as splash curtains, accessible service areas, adjustable legs, and safe access doors to facilitate operation, cleaning, and maintenance.
  • Units must operate quietly and prevent external water splashing.

• Performance and Testing

  • Machines must demonstrate compliance with noise level limits, operational effectiveness, leakage resistance, and wash/sanitize cycles.
  • Optional equipment (like booster heaters and chemical feeders) must meet associated NSF/ANSI and UL standards.
  • All performance is verified through rigorous testing procedures conforming to relevant test methods.

• Documentation and Marking

  • Includes requirements for machine identification, data plates, and detailed user manuals for installation, operation, and maintenance in accordance with referenced standards.

Applications

ASTM F858-24-compliant dishwashing machines are widely used in:

• Commercial kitchens of restaurants, hotels, and cafeterias
• Institutional food service settings, such as hospitals, schools, correctional facilities, and military mess halls
• Catering operations where hygiene and throughput are crucial
• Any high-volume dishwashing requirement where consistent hot water sanitization and rack conveyance are essential

Using equipment certified to ASTM F858-24 ensures:

• Enhanced protection against cross-contamination and foodborne illness.
• Reliable operation under varied workloads and wash cycles.
• Regulatory compliance for health and safety inspections.
• Extended product life and reduced maintenance due to robust materials and construction.

Related Standards

Related documents and standards referenced in ASTM F858-24 include:

• ASTM F861 – Specification for Commercial Dishwashing Racks
• ASTM F1920 – Test Method for Performance of Rack Conveyor Commercial Dishwashing Machines
• NSF/ANSI 3 – Commercial Warewashing Equipment
• NSF/ANSI 5 – Water Heaters & Hot Water Supply Equipment
• NSF/ANSI 29 – Chemical Feeders for Commercial Spray-Type Dishwashing Machines
• UL 921 – Commercial Electric Dishwashers
• UL 1453 – Electric Booster & Commercial Storage Tank Water Heaters
• ASSE 1004 – Dishwashers (Sanitary Engineering Specifications)

By referencing these standards, ASTM F858-24 ensures harmonization with industry best practices, regulatory compliance, and reliable equipment performance across diverse commercial and institutional environments.

Keywords: ASTM F858-24, hot water sanitizing, commercial dishwashing, single tank, conveyor rack, food service equipment, sanitizing dishwasher, NSF/ANSI, UL 921, corrosion-resistant dishwasher, hygiene compliance.

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F858 − 24 An American National Standard
Standard Specification for
Hot Water Sanitizing Commercial Dishwashing Machines,
Single Tank, Conveyor Rack Type
This standard is issued under the fixed designation F858; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 2.2 Federal Regulation:
OSHA Title 29
1.1 This specification covers single tank, automatic rack
2.3 NSF International Standards, Criteria, and Listings:
conveyor type, commercial dishwashing machines.
NSF/ANSI 3 Commercial Warewashing Equipment
1.2 The values stated in inch-pound units are to be regarded
NSF/ANSI 5 Water Heaters, Hot Water Supply Boilers, and
as standard. The values given in parentheses are mathematical
Heat Recovery Equipment
conversions to SI units that are provided for information only
NSF/ANSI 29 Detergent/Chemical Feeders for Commercial
and are not considered standard. Spray-Type Dishwashing Machines
NSF/ANSI 51 Plastic Materials and Components Used in
1.3 This international standard was developed in accor-
Food Equipment
dance with internationally recognized principles on standard-
NSF Food Equipment and Related Products, Components,
ization established in the Decision on Principles for the
and Materials
Development of International Standards, Guides and Recom-
2.4 Underwriters Laboratories Standard:
mendations issued by the World Trade Organization Technical
UL 921 Commercial Electric Dishwashers
Barriers to Trade (TBT) Committee.
UL 1453 Electric Booster and Commercial Storage Tank
Water Heaters
2. Referenced Documents
2.5 American Society of Sanitary Engineering Standards:
2.1 ASTM Standards:
ASSE 1004 Dishwashers
A436 Specification for Austenitic Gray Iron Castings
A554 Specification for Welded Stainless Steel Mechanical
3. Terminology
Tubing
3.1 Definitions:
A582/A582M Specification for Free-Machining Stainless
3.1.1 commercial dishwashing machines, n—machines that
Steel Bars
uniformly wash, rinse, and sanitize eating and drinking uten-
B43 Specification for Seamless Red Brass Pipe, Standard
sils.
Sizes
3.1.1.1 Discussion—The machines shall be capable of re-
B127 Specification for Nickel-Copper Alloy Plate, Sheet,
moving physical soil from properly racked and pre-scraped
and Strip
items, and sanitizing multiple use eating and drinking utensils.
F760 Specification for Food Service Equipment Manuals
These machines shall automatically convey racks of soiled
F861 Specification for Commercial Dishwashing Racks
dishes through the treatment stages of the machine, conveying
F1920 Test Method for Performance of Rack Conveyor
them out at the clean end of the machine. The dishwashing
Commercial Dishwashing Machines
machines shall consist of the following principal parts: base, or
legs, or both; wash chamber; rinse chamber; tanks; inspection
This specification is under the jurisdiction of ASTM Committee F26 on Food
Service Equipment and is the direct responsibility of Subcommittee F26.01 on Code of Federal Regulations, Chapter XVII, Part 1910, available from
Cleaning and Sanitation Equipment. Superintendent of Documents, Government Printing Office, Washington, DC 20402.
Current edition approved Feb. 1, 2024. Published March 2024. Originally
approved in 1984. Last previous edition approved in 2018 as F858 – 18. DOI: Available from NSF International, P.O. Box 130140, 789 N. Dixboro Rd., Ann
10.1520/F0858-24. Arbor, MI 48105, http://www.nsf.org.
2 5
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from Underwriters Laboratories (UL), UL Headquarters, 333 Pfing-
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM sten Road, Northbrook, IL, 60062, http://www.ul.com.
Standards volume information, refer to the standard’s Document Summary page on Available from ASSE International Chapter of IAPMO, LLC, 18927 Hickory
the ASTM website. Creek Drive, Suite 220, Mokena, Illinois 60448, http://www.asse-plumbing.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F858 − 24
doors; spray assemblies; pumps; motors; controls; piping; 5.1.10 Treatment and painting if other than specified (see
valves; heating equipment; conveying mechanism; and acces- Section 10);
sories. 5.1.11 When energy consumption profiles, water consump-
tion profiles, or productivity profiles are desired (see 12.3); and
4. Classification
5.1.12 Manufacturer’s certification, when required (see Sec-
tion 13).
4.1 General—Dishwashing machines shall be of the follow-
ing types, styles, classes, size, and capacity groups, as speci-
6. Materials and Design
fied.
6.1 All materials shall be specified as follows:
4.2 Types:
6.1.1 Materials used shall be free from defects that would
4.2.1 Type I—This machine shall be designed and supplied
adversely affect the performance or maintainability of indi-
to accept the feeding of soiled tableware from the right side,
vidual components of the overall assembly. The dishwashing
when facing the front of the machine.
machines shall meet the material, design, and construction
4.2.2 Type II—This machine shall be designed and supplied
requirements of NSF/ANSI 3.
to accept the feeding of soiled tableware from the left side,
6.1.2 Corrosion-Resistant Steel—Corrosion-resistant steel
when facing the front of the machine.
shall conform to the requirements of any 300 series stainless
4.3 Styles and Classes: steel specified in 2.1.
4.3.1 Style 1 (Steam Heated)—(20 to 35 psi, 137.9 to 241.3
6.1.3 Corrosion Resisting Material—Corrosion-resisting
kPa) flowing pressure at point of machine connection. material is other than corrosion resistant steel that is equivalent
4.3.1.1 Class A—Injector.
in the dishwasher application.
4.3.1.2 Class B—Heat exchange coil. 6.1.4 Nickel-Copper Alloy—Nickel-copper alloys shall con-
4.3.2 Style 2 (Electrically heated).
form to the requirements of Specification B127.
4.3.3 Style 3 (Gas-heated). 6.1.5 Plastics—All plastic materials and components used
4.3.3.1 Class C—Natural gas. in the dishwashing machine rinse system shall conform to
4.3.3.2 Class D—LP gas. NSF/ANSI 3.
4.4 Size and Capacity (see Specification F861):
7. Construction Requirements
3 3
4.4.1 Group A—19 ⁄4 by 19 ⁄4 in. (501.6 by 501.6 mm)
7.1 The dishwashing machine shall be complete so that
(nominal) racks at 162 per hour minimum.
when connected to the specified source of power, water supply,
3 3
4.4.2 Group B—19 ⁄4 by 19 ⁄4 in. (501.6 by 501.6 mm)
heating means (steam, electric, or gas), drainage, detergent,
(nominal) racks at 180 per hour minimum.
and rinse agent feeder as applicable, the unit can be used for its
3 3
4.4.3 Group C—19 ⁄4 by 19 ⁄4 in. (501.6 by 501.6 mm)
intended function. Dishwashers shall be rigid, quiet in
(nominal) racks at 194 per hour minimum.
operation, free from objectionable vibration, and so con-
4.5 All dishwashing machines of the same classification,
structed as to prevent objectionable splashing of water to the
model or material list designation furnished with similar
outside of the machine. The machine shall be equipped with
options under a specific purchase order, shall be identical to the
splash curtains to prevent excessive splash and spray carryover.
extent necessary to ensure interchangeability of component
Parts requiring adjustment or service, or both, shall be readily
parts, assemblies, accessories, and spare parts.
accessible from the front and side of the machine. The machine
shall wash dishes by means of a water and detergent solution
5. Ordering Information
pumped from the wash tank and shall final rinse the dishes with
5.1 Purchasers should select the preferred options permitted fresh water from an outside source. Provisions shall be made to
in this specification and include the following information in fill the wash tank either directly from the regular hot water
procurement documents:
supply or through a booster. The dishwashing machine shall
3 3
5.1.1 Title, number, and date of this standard; have a conveyor for handling 19 ⁄4 by 19 ⁄4 in. (501.6 by 501.6
5.1.2 Type, style, class, and group machine required (see
mm) (nominal) racks. The conveyor shall be protected by an
4.1); adjustable slip clutch or other device. Means shall be provided
5.1.3 Noise level requirements, if other than specified (See for releasing or disconnecting the driving power, or the drive,
11.2); in case of jamming. The conveyor shall be driven by a
5.1.4 When a service-supply valve is required (see 7.4); motor-driven gear reduction unit. The pumped wash and final
5.1.5 When a standard 40°F (22°C) temperature rise steam, rinse treatment shall be controlled by means of the conveyor
or electric, or gas booster is required, or stipulate if the required speed as determined by NSF/ANSI 3 for single tank conveyor
temperature rise is more than 40°F (22°C) (see 7.13); type machines. The final rinse spray control shall have a
5.1.6 Electrical power supply characteristics (current, positive return to the OFF position when there are no racks in
voltage, phase, frequency). See Section 8; process to ensure the conservation of final rinse water. The
5.1.7 When a detergent feeder is required (see 7.15); machine shall be provided with tracks of corrosion-resistant
5.1.8 When a rinse agent feeder is required (see 7.16); steel or other corrosion-resisting material 0.070 in. (1.78 mm)
5.1.9 Accessory equipment, such as end cowls with vent or equivalent die formed 0.059 in. (1.5 mm). Dishwashers shall
opening, or spare and maintenance parts required, as suggested have an inside working height of not less than 17 ⁄2 in. (444.5
by manufacturer; mm) above the track.
F858 − 24
7.2 Conveyor—The conveyor shall be of heavy duty con- other corrosion resisting material, and shall be rigid and
struction and of a suitable corrosion-resisting material. It shall stiffened as necessary. When vertical sliding doors are
be designed to convey racks through the dishwasher automati- provided, door safety catch(es) or equivalent means shall be
cally. See Specification F861. provided to hold them in the upright position. Doors shall be
splashproof, and their exposed edges shall be smooth and
7.3 Piping, Tubing, Fittings, and Valves (Installation)—
formed to prevent canting, or warping. One door assembly
Connections shall be readily accessible to facilitate installation
shall be furnished for each tank.
and maintenance. Piping, tubing, and valves shall be located,
whenever possible, on the exterior of the machine. 7.11 Legs (Feet)—The machine shall be rigidly constructed
and have four or more legs (feet) made of corrosion-resisting
7.4 Piping and Fittings—Water, steam piping, and fittings
steel, or other corrosion resisting material. Legs shall be
shall be of corrosion-resisting material (see Specification B43).
adjustable, so that the height of the track may be varied from
Fresh water supply to the tank shall be discharged not lower
34 to 35 in. (863.6 to 889 mm) above the floor.
than 2 in. (50.8 mm) above the maximum flood level rim, or an
effective air gap or vacuum breaker shall be installed to prevent
7.12 Pump and Motor Assemblies:
backflow. Backflow protection shall be in accordance with
7.12.1 Assemblies—The pump and motor assembly shall be
NSF/ANSI 3 and ASSE 1004. The drain and other plumbing
mounted on the tank or on a rigid steel base. Rotary seals shall
connections shall be standard pipe or tubing connections.
be provided for pump shafts and shall be removable for
Drainage piping shall be corrosion-resisting material, or suit-
servicing.
able heat-resisting plastic tubing with fittings. Drains may be
7.12.2 Pump—Pump casings shall be cast iron or corrosion-
joined into a single trunk line requiring only one connection or
resisting material (see Specification A436) and shall have a
arranged to permit individual connections to the waste line.
removable cover or inspection plate, or be of such a design as
to permit ease of accessibility for inspection and removal of
7.5 Valves—Steam valves shall be corrosion-resisting mate-
foreign items from the impeller and interior. The pump shall
rial designed for steam applications and for a saturated steam
either be self-draining or equipped with means for draining.
working pressure of 50 psi (344.6 kPa). When specified, a
The shaft shall be of corrosion-resisting steel, properly aligned
separately packed service supply valve shall be provided for
and supported. The impeller shall be corrosion-resisting mate-
closing the supply of water to the dishwasher. The drain valve
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F858 − 18 F858 − 24 An American National Standard
Standard Specification for
Hot Water Sanitizing Commercial Dishwashing Machines,
Single Tank, Conveyor Rack Type
This standard is issued under the fixed designation F858; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope
1.1 This specification covers single tank, automatic rack conveyor type, commercial dishwashing machines.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.3 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
A436 Specification for Austenitic Gray Iron Castings
A554 Specification for Welded Stainless Steel Mechanical Tubing
A582/A582M Specification for Free-Machining Stainless Steel Bars
B43 Specification for Seamless Red Brass Pipe, Standard Sizes
B127 Specification for Nickel-Copper Alloy Plate, Sheet, and Strip
F760 Specification for Food Service Equipment Manuals
F861 Specification for Commercial Dishwashing Racks
F1920 Test Method for Performance of Rack Conveyor Commercial Dishwashing Machines
2.2 Federal Regulation:
OSHA Title 29
2.3 NSF International Standards, Criteria, and Listings:
NSF/ANSI 3 Commercial Warewashing Equipment
NSF/ANSI 5 Water Heaters, Hot Water Supply Boilers, and Heat Recovery Equipment
NSF/ANSI 29 Detergent/Chemical Feeders for Commercial Spray-Type Dishwashing Machines
NSF/ANSI 51 Plastic Materials and Components Used in Food Equipment
NSF Food Equipment and Related Products, Components, and Materials
This specification is under the jurisdiction of ASTM Committee F26 on Food Service Equipment and is the direct responsibility of Subcommittee F26.01 on Cleaning
and Sanitation Equipment.
Current edition approved May 1, 2018Feb. 1, 2024. Published May 2018March 2024. Originally approved in 1984. Last previous edition approved in 20132018 as
ε1
F858 – 07 (2013)F858 – 18. . DOI: 10.1520/F0858-18.10.1520/F0858-24.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Code of Federal Regulations, Chapter XVII, Part 1910, available from Superintendent of Documents, Government Printing Office, Washington, DC 20402.
Available from NSF International, P.O. Box 130140, 789 N. Dixboro Rd., Ann Arbor, MI 48105-9723.48105, http://www.nsf.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F858 − 24
2.4 Underwriters Laboratories Standard:
UL 921 Commercial Electric Dishwashers
UL 1453 Electric Booster and Commercial Storage Tank Water Heaters
2.5 American Society of Sanitary Engineering Standards:
ASSE 1004 Dishwashers
3. Terminology
3.1 Definitions:
3.1.1 commercial dishwashing machines, n—machines that uniformly wash, rinse, and hot water sanitize eating and drinking
utensils.
3.1.1.1 Discussion—
The machines shall be capable of removing physical soil from properly racked and pre-scraped items, and sanitizing multiple use
eating and drinking utensils. These machines shall automatically convey racks of soiled dishes through the treatment stages of the
machine, conveying them out at the clean end of the machine. The dishwashing machines shall consist of the following
principleprincipal parts: base, or legs, or both; wash chamber; rinse chamber; tanks; inspection doors; spray assemblies; pumps;
motors; controls; piping; valves; heating equipment; conveying mechanism; and accessories.
4. Classification
4.1 General—Dishwashing machines shall be of the following types, styles, classes, size, and capacity groups, as specified.
4.2 Types:
4.2.1 Type I—This machine shall be designed and supplied to accept the feeding of soiled tableware from the right side, when
facing the front of the machine.
4.2.2 Type II—This machine shall be designed and supplied to accept the feeding of soiled tableware from the left side, when
facing the front of the machine.
4.3 Styles and Classes:
4.3.1 Style 1 (Steam Heated)—(20 to 35 psi, 137.9 to 241.3 kPa) flowing pressure at point of machine connection.
4.3.1.1 Class A—Injector.
4.3.1.2 Class B—Heat exchange coil.
4.3.2 Style 2 (Electrically heated).
4.3.3 Style 3 (Gas-heated).
4.3.3.1 Class C—Natural gas.
4.3.3.2 Class D—LP gas.
4.4 Size and Capacity: Capacity (see Specification F861):
3 3
4.4.1 Group A—19 ⁄4 by 19 ⁄4 in. (501.6 by 501.6 mm) (nominal) racks at 162 per hour minimum.
3 3
4.4.2 Group B—19 ⁄4 by 19 ⁄4 in. (501.6 by 501.6 mm) (nominal) racks at 180 per hour minimum.
3 3
4.4.3 Group C—19 ⁄4 by 19 ⁄4 in. (501.6 by 501.6 mm) (nominal) racks at 194 per hour minimum.
Available from Underwriters Laboratories, Inc., Laboratories (UL), UL Headquarters, 333 Pfingsten Road, Northbrook, IL 60062.IL, 60062, http://www.ul.com.
Available from American Society of Sanitary Engineering, 901 Canterbury, Suite A, Westlake, Ohio 44145.ASSE International Chapter of IAPMO, LLC, 18927 Hickory
Creek Drive, Suite 220, Mokena, Illinois 60448, http://www.asse-plumbing.org.
F858 − 24
4.5 All dishwashing machines of the same classification, model or material list designation furnished with similar options under
a specific purchase order, shall be identical to the extent necessary to ensure interchangeability of component parts, assemblies,
accessories, and spare parts.
5. Ordering Information
5.1 Purchasers should select the preferred options permitted in this specification and include the following information in
procurement documents:
5.1.1 Title, number, and date of this standard;
5.1.2 Type, style, class, and group machine required (see 4.1);
5.1.3 Noise level requirements, if other than specified (See 11.2);
5.1.4 When a service-supply valve is required (see 7.4);
5.1.5 When a standard 40°F (22°C) temperature rise steam, or electric, or gas booster is required, or stipulate if the required
temperature rise is more than 40°F (22°C) (see 7.13);
5.1.6 Electrical power supply characteristics (current, voltage, phase, frequency). See Section 8;
5.1.7 When a detergent feeder is required (see 7.15);
5.1.8 When a rinse agent feeder is required (see 7.16);
5.1.9 Accessory equipment, such as end cowls with vent opening, or spare and maintenance parts required, as suggested by
manufacturer;
5.1.10 Treatment and painting if other than specified (see Section 10);
5.1.11 When energy consumption profiles, water consumption profiles, or productivity profiles are desired (see 12.3); and
5.1.12 Manufacturer’s certification, when required (see Section 13).
6. Materials and Design
6.1 All materials shall be specified as follows:
6.1.1 Materials used shall be free from defects that would adversely affect the performance or maintainability of individual
components of the overall assembly. The dishwashing machines shall meet the material, design, and construction requirements of
NSF/ANSI 3.
6.1.2 Corrosion-Resistant Steel—Corrosion-resistant steel shall conform to the requirements of any 300 series stainless steel
specified in 2.1.
6.1.3 Corrosion Resisting Material—Corrosion-resisting material is other than corrosion resistant steel that is equivalent in the
dishwasher application.
6.1.4 Nickel-Copper Alloy—Nickel-copper alloys shall conform to the requirements of Specification B127.
6.1.5 Plastics—All plastic materials and components used in the dishwashing machine rinse system shall conform to NSF/ANSI
3 or NSF/ANSI 51. 3.
7. Construction Requirements
7.1 The dishwashing machine shall be complete so that when connected to the specified source of power, water supply, heating
F858 − 24
means (steam, electric, or gas), drainage, detergent, and rinse agent feeder as applicable, the unit can be used for its intended
function. Dishwashers shall be rigid, quiet in operation, free from objectionable vibration, and so constructed as to prevent
objectionable splashing of water to the outside of the machine. The machine shall be equipped with splash curtains to prevent
excessive splash and spray carryover. Parts requiring adjustment or service, or both, shall be readily accessible from the front and
side of the machine. The machine shall wash dishes by means of a water and detergent solution pumped from the wash tank and
shall final rinse the dishes with fresh water from an outside source. Provisions shall be made to fill the wash tank either directly
3 3
from the regular hot water supply or through a booster. The dishwashing machine shall have a conveyor for handling 19 ⁄4 by 19 ⁄4
in. (501.6 by 501.6 mm) (nominal) racks. The conveyor shall be protected by an adjustable slip clutch or other device. Means shall
be provided for releasing or disconnecting the driving power, or the drive, in case of jamming. The conveyor shall be driven by
a motor-driven gear reduction unit. The pumped wash and final rinse treatment shall be controlled by means of the conveyor speed
as determined by NSF/ANSI 3 for single tank conveyor type machines. The final rinse spray control shall have a positive return
to the OFF position when there are no racks in process to ensure the conservation of final rinse water. The machine shall be
provided with tracks of corrosion-resistant steel or other corrosion-resisting material 0.070 in. (1.78 mm) or equivalent die formed
0.059 in. (1.5 mm). Dishwashers shall have an inside working height of not less than 17 ⁄2 in. (444.5 mm) above the track.
7.2 Conveyor—The conveyor shall be of heavy duty construction and of a suitable corrosion-resisting material. It shall be designed
to convey racks through the dishwasher automatically. See Specification F861.
7.3 Piping, Tubing, Fittings, and Valves (Installation)—Connections shall be readily accessible to facilitate installation and
maintenance. Piping, tubing, and valves shall be located, whenever possible, on the exterior of the machine.
7.4 Piping and Fittings—Water, steam piping, and fittings shall be of corrosion-resisting material (see Specification B43). Fresh
water supply to the tank shall be discharged not lower than 2 in. (50.8 mm) above the maximum flood level rim, or an effective
air gap or vacuum breaker shall be installed to prevent backflow. Backflow protection shall be in accordance with NSF/ANSI 3
and ASSE 1004. The drain and other plumbing connections shall be standard pipe or tubing connections. Drainage piping shall
be corrosion-resisting material, or suitable heat-resisting plastic tubing with fittings. Drains may be joined into a single trunk line
requiring only one connection or arranged to permit individual connections to the waste line.
7.5 Valves—Steam valves shall be corrosion-resisting material designed for steam applications and for a saturated steam working
pressure of 50 psi (344.6 kPa). When specified, a separately packed service supply valve shall be provided for closing the supply
of water to the dishwasher. The drain valve shall be permanently marked to show “open” and “closed” position and shall be
lever-operated, ruggedly designed for foot or hand operation except when drain valve closure is automatic. Fresh water rinse valves
shall be reliable and fully automatic and suitable for 210°F (98.9°C) water. The manually operated valves shall be identified.
7.6 Spray Assemblies—All spray nozzles and spray arm manifolds shall be corrosion resisting materials (see Specifications A554
and A582/A582M). All prewash and wash spray assemblies shall be removable without the use of tools and shall be easy to clean.
Final sanitizing rinse spray assemblies, components, or both shall be removable for deliming, descaling, and similar maintenance.
7.7 Tank—The tank shall be constructed of not less than 0.055 in. (1.4 mm) corrosion-resistant steel, or other corrosion resisting
material.
7.8 Overflow—The dishwashers shall have a readily accessible overflow drain in the tank. The overflow unit, or cover, when
provided, shall be removable for cleaning.
7.9 Scrap Trays (Strainers)—Scrap trays of corrosion-resistant steel, not less than 0.044 in. (1.1 mm) thick, or other corrosion
resisting material shall be provided to prevent insoluble matter and large pieces of food residue from passing into the tank. The
ledges on which the scrap trays rest shall be so designed that s
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