3.7(A) Warewashing
b) The flow rate for an overhead sprayer at a warewash sink should not exceed a flow rate of 5.4 liters/min (1.4 gal/min).
3.8 Warewash Machines
Hot water used for sanitizing in mechanical warewashing should be 66°C - 74°C (150F-165F) for washing and 74°C - 82°C (165F-180F) for sanitizing.
a) Exact water temperatures will comply with government or regulatory standards; if no government or regulatory standards exist, the mechanical warewasher’s manufacturer standards will apply.
b) When hot water sanitization is used in a warewashing machine, the combination of wash water and sanitizing rinse water will be sufficient to raise the utensil surface to 71o C (160o F).
c) For mechanical warewashing machines utilizing hot water for the sanitizing rinse, the water temperature should not exceed 90o C (194o F) at the manifold. Temperatures greater than this will result in the water turning to steam upon exiting the manifold and will not be effective in raising the equipment/utensil surface to 71o C (160o F).
(D) High Temperature Warewash Machines
a) 1. If a booster heater will be installed below the drain board, it will be installed at least 15 cm (6 in.) above the floor and away from the wall, and in a manner that will allow accessibility for proper cleaning and maintenance. (See also Appendix 2 on backflow prevention)
b) Adhesive heat sensitive papers are an effective way to determine if a utensil’s surface temperature reached a temperature sufficient to ensure it is sanitized (see
terms and definitions Section). One company providing test papers is Paper Thermometer, their website is: http://paperthermometer.com/default/products.html
Maximum / Minimum registering thermometers can be obtained from your thermometer supplier or from Cooper Atkins at http://www.cooper-atkins.com/Products/Digitals/MAX_Digital_Pocket_Test_Thermometer_DPP800W/
Another option to check warewash machine maximum temperatures is to utilize a thermocouple thermometer with a remote probe that can be placed in the warewash machine while the thermocouple itself remains in hand outside the warewash machine.
(F) Warewash machine should be equipped with a pressure gauge that measures water pressure in the hot water sanitizing rinse supply line immediately before entering the warewash machine. When the gauge is upstream from the fresh hot water sanitizing rinse control valve, the device will be mounted in a 6 mm (1/4 in.) pipe size valve.
3.9(A) Hot Water Heaters
e) Hot water supply from the water heater should be sufficient to provide 49o-60o C (120o-140o F) water for the continuous and peak hot water demands of the establishment.
Sizing the hot water generating capability should assume a supply temperature requirement of 49ºC (120F) to each fixture and 60ºC (140F) to the mechanical dishwashing machines.
Unless otherwise required, a water heater should be 75% efficient. A higher efficiency water heater will lower the operating cost.
3.9 (B) Instantaneous Water Heaters
a) Instantaneous water heater will be capable of delivering a 38 degree Celsius (100 degree Fahrenheit) water temperature rise at a flow rate of 8 liters/minute (2 gallons/minute).
Instantaneous water heaters should be sized to provide hot water of 49ºC – 60ºC (120ºF - 140ºF) for the needs of the equipment serviced, and at a rate of at least 8 liters/minute (2 gallons/minute) at each sink and fixture that utilizes hot water