SUN - NSF 6-2014, Dispensing Freezers

Effective March 31, 2016

Standard Information
Standard Number:
NSF 6-2014
Standard Name:
Dispensing Freezers
Standard Edition and Issue Date:
NSF 6-2014, Dated February 1, 2015
Date of Previous Revisions to Standard:
NSF 6- 2012, Dated August 8, 2012
 
Effective Date of New/Revised Requirements

Effective Date (see Schedule below): March 31, 2016

 
Impact, Overview, Fees and Action Required

Impact Statement: A review of all Listing Reports is necessary to determine which products comply with new/revised requirements and which products will require re-evaluation. NOTE: Effective immediately, this revised standard will be exclusively used for evaluation of new products unless the Applicant requests in writing that current requirements be used along with their understanding that their listings will be withdrawn on Effective Date noted above, unless the product is found to comply with new/revised requirements.

Overview of Changes: This standard has recently undergone updates and those technical changes affecting existing certifications are attached. New product submittals will be required to evaluated and certified to these new/revised requirements (unless the Applicant requests in writing to use old requirements up to the Effective Date). Existing certification reports will need to be reviewed to confirm compliance with these new/revised requirements by the March 31, 2016 Effective Date. The new/revised requirements affect product heating, cooling, and heat treatment efficacy testing for heat treatment dispensing freezers that utilize pre-packaged product. Specific details of new/revised requirements are found in table below.

Client Action Required:

Information - To assist our Engineer with review of your Listing Reports, please submit technical information in response to the new/revised paragraphs noted in the attached or explain why these new/revised requirements do not apply to your product (s).

Current Listings Not Active? – Please immediately identify any current Listing Reports or products that are no longer active and should be removed from our records. We will do this at no charge as long as Intertek is notified in writing prior to the review of your reports.

 
Description of New/Revised Technical Requirements
ClauseVerdictCommentNC#
----This revision updated the requirements affect product heating, cooling, and heat treatment efficacy testing for heat treatment dispensing freezers that utilize pre-packaged product, specifically, covering sections 6.3, 6.4, and 6.5. Sample will need to be resubmitted for this testing if the heat treatment dispensing freezer utilizes pre-packaged product. 
6.3 

Heat treatment cycle – Product heating

This test will need to be performed for heat treatment dispensing freezers that utilize pre-packaged product as new thermocouple locations and acceptance criteria have been added to the Standard as indicated below:

6.3.2.2 For machines with pre-packaged product

Thermocouple #1: 1 ± 0.1 in (25 ± 2 mm) below the product level in the middle of the product reservoir.

Thermocouple # 2: product-holding area of the dispensing head.

Thermocouple # 3: as close to the rear of the freezing barrel as possible.

Thermocouple # 4: located in all product transfer circuits. (Multiple thermocouples may be required. See section 6.2.2.)

The product temperature at thermocouple #1 shall be recorded for the duration of the test. The time required for the temperature at monitoring locations 2-4 to increase from 41 °F (5 °C) to 150 °F (65 °C) shall be recorded. The time elapsed while the product temperature is continuously maintained at 150 °F (65 °C) or greater shall be recorded for thermocouple location 2-4. The heat treatment cycle shall be allowed to continue through the cooling portion. The test shall be conducted in a controlled temperature environment at an ambient temperature of 73 ± 3 °F (23 ± 2 °C).

6.3.3 Acceptance criteria

6.3.3.2 For machines with pre-packaged product

The product temperature at monitoring locations 2-4 shall increase from 41 °F (5 °C) to 150 °F (65 °C) in 90 min or less. The product temperature at monitoring locations 2-4 shall be maintained at 150 °F (65 °C) or greater for at least 30 min. The product temperature at thermocouple #1 shall be maintained at or below 41°F (5°C) for the full duration of the test.
 
6.4 

6.4 Heat treatment cycle – Product cooling

6.4.2 Test method

6.4.2.2 For machines with pre-packaged product

Upon completion of the test described in 6.3.2, a second heat treatment cycle shall be started. The ambient temperature in the controlled environment shall be increased to 86 ± 3 °F (30 ± 2°C). The product temperature shall be monitored at the locations described in 6.3.2.2 for the duration of the cooling portion of the heat treatment cycle. The time required for the product temperature at monitoring location 2-4 to decrease from 150 °F (65 °C) to 41 °F (5 °C) shall be recorded.

6.4.3 Acceptance criteria

6.4.3.2 For machines with pre-packaged product

The product temperature at monitoring locations 2-4 shall drop from 150 °F (65 °C) to 41 °F (5 °C) in 120 min or less. The product temperature at thermocouple #1 shall be maintained at or below 41°F (5°C) for the full duration of the test.
 
6.5 

6.5 Heat treatment cycle – Heat treatment efficacy

6.5.2.2 For machines with pre-packaged product

The dispensing freezer shall be operated in accordance with the manufacturer's instructions. After the freezer dispenses and discards 250 mL of product, a heat treatment cycle shall be started. Upon completion of one heat treatment cycle, four 40-mL samples shall be collected by dispensing product into sample bottles. 40 mL of product shall be dispensed and discarded between each two sample collections. The freezer shall be allowed to operate for a total of 24 h, including a minimum of 12 h in the standby mode (if available) before starting the next heat treatment cycle. Prior to the start of the next heat treatment cycle, the product path shall be refilled with inoculated product mix (challenge suspension) so that the E. coli density in the product path is at least 1 x 104 cfu/mL. The procedures described in this paragraph shall be repeated each day for as many days (not to exceed 42 d) as is recommended by the manufacturer between manual cleaning and sanitization of the dispensing freezer.

All samples and controls shall be enumerated by the Standard Plate Count and Violet Red Bile Agar pour plate methods in accordance with APHA, Standard Methods for the Examination of Dairy Products

6.5.3 Acceptance criteria

The plate counts for each of the collected samples shall not exceed the following:

– total plate count organisms: 5 x 104 cfu/mL; and

– coliform organisms (E. coli): 10 cfu/mL.
 

CUSTOMERS PLEASE NOTE: This Table and column "Verdict" can be used in determining how your current or future production is or will be in compliance with new/revised requirements.