ASHRAE-90.1-2022- - Page 086

Extracted Content

c. Walk-in coolers shall contain wall, ceiling, and door insulation of at least R-25 and at least R-32 for

walk-in freezers . Exception to 6.4.5(c): Glazed portions of doors or structural members. d. Walk-in freezers shall contain floor insulation of at least R-28. e. Evaporator fan motors that are less than 1 hp and less than 460 V shall use electronically commutated

motors (brushless direct-current motors) or three-phase motors. f. Lights shall use light sources with an efficacy of 40 lm/W or more, including ballast losses (if any). Light sources with lower efficacy may be used in conjunction with a timer or device that turns off the lights within 15 minutes of when the walk-in cooler or walk-in freezer is not occupied by people. g. Transparent reach-in doors for walk-in freezers, and windows in walk-in freezer doors, shall be of triple pane glass, either filled with inert gas or with heat-reflective treated glass or vacuum insulating glazing. ( Informative Note: For applications in the U.S., alternate innovative component technologies (e.g., vacuum insulating glazing for transparent reach-in doors) are allowable only if the manufacturer has obtained a waiver from U.S. DOE.) h. Transparent reach-in doors for walk-in coolers, and windows in walk-in cooler doors, shall be double pane glass with heat-reflective treated glass and gas filled, or triple-pane glass, either filled with inert gas or with heat-reflective treated glass or vacuum insulating glazing. ( Informative Note: For applications in the U.S., alternate innovative component technologies (e.g., vacuum insulating glazing for transparent reach-in doors) are allowable only if the manufacturer has obtained a waiver from U.S. DOE.) i. Antisweat heaters without antisweat heater controls shall have a total door rail, glass, and frame heater power draw of  7.1 W/ft [2] of door opening for walk-in freezers and 3.0 W/ft [2] of door opening for walk-in coolers . j. Antisweat heater controls shall reduce the energy use of the antisweat heater as a function of the relative humidity in the air outside the door or in response to the condensation on the inner glass pane. k. Condenser fan motors that are less than 1 hp shall use electronically commutated motors, permanent

split-capacitor-type motors, or three-phase motors. l. All walk-in freezers shall incorporate temperature-based defrost termination control with a time limit default. The defrost cycle shall terminate first on an upper temperature limit breach and second upon a time limit breach. Exception to 6.4.5(l): Walk-in coolers and walk-in freezers combined in a single enclosure greater than

3000 ft [2] . m. Doors in walk-in coolers and walk-in freezers shall meet the requirements of Tables 6.8.1-18 and 6.8.1 19. Walk-in cooler and walk-in freezer refrigeration systems, except for walk-in process cooling refrigeration systems as defined in 10 CFR 431.302, shall meet the requirements of Table 6.8.1-20.

6.4.6 Refrigerated Display Case

a. All refrigerated display cases shall conform to Section 6.4.1.1 and Table 6.8.1-11. b. Lighting in refrigerated display cases and glass doors installed on walk-in coolers and walk-in freezers

shall be controlled by one of the following:

1. Automatic time-switch controls to turn off lights during nonbusiness hours: Timed overrides for display cases or walk-in coolers and walk-in freezers may be used to turn the lights on for up to one hour and shall automatically time out to turn the lights off.
2. Motion sensor controls on each display case or walk-in door section that reduce lighting power by at least 50% within three minutes after the area within the sensor range is vacated. c. All low-temperature display cases shall incorporate temperature-based defrost termination control with a

time-limit default. The defrost cycle shall terminate first on an upper temperature limit breach and second on a time limit breach. d. Antisweat heater controls shall reduce the energy use of the antisweat heater as a function of the relative

humidity in the air outside the door or in response to the condensation on the inner glass pane.

6.4.7 Liquid-to-Liquid Heat Exchangers. Plate-type liquid-to-liquid heat exchangers shall be rated in accordance with AHRI 400. Section 12 contains a complete specification of the referenced test procedure.

6.5 Prescriptive Compliance Path 6.5.1 Economizers. Each cooling system shall include either an air economizer or fluid economizer meeting the requirements of Sections 6.5.1.1 through 6.5.1.5.

Exceptions to 6.5.1: Economizers are not required for the following systems :

1. Individual fan-cooling units with a supply capacity less than the minimum listed in Table 6.5.1-1.

84 ANSI/ASHRAE/IES Standard 90.1-2022 (I-P)