C403.10.2 Walk-In Coolers and Walk-In Freezers (Mandatory)
Site-assembled or site-constructed walk-in coolers and walk-in freezers shall comply with the following:
Automatic door closers shall be provided that fully close walk-in doors that have been closed to within 1 inch (25 mm) of full closure.
Exception: Closers are not required for doors more than 45 inches (1143 mm) in width or more than 7 feet (2134 mm) in height.
- Doorways shall be provided with strip doors, curtains, spring-hinged doors or other method of minimizing infiltration when the doors are open.
Walls shall be provided with insulation having a thermal resistance of not less than R-25, ceilings shall be provided with insulation having a thermal resistance of not less than R-25 and doors of walk-in coolers and walk-in freezers shall be provided with insulation having a thermal resistance of not less than R-32.
Exception: Insulation is not required for glazed portions of doors or at structural members associated with the walls, ceiling or door frame.
- The floor of walk-in freezers shall be provided with insulation having a thermal resistance of not less than R-28.
- Transparent reach-in doors for and windows in opaque walk-in freezer doors shall be provided with triple-pane glass having the interstitial spaces filled with inert gas or provided with heat-reflective treated glass.
- Transparent reach-in doors for and windows in opaque walk-in cooler doors shall be double-pane heat-reflective treated glass having the interstitial space gas filled.
- Evaporator fan motors that are less than 1 hp (0.746 kW) and less than 460 volts shall be electronically commutated motors or 3-phase motors.
Condenser fan motors that are less than 1 hp (0.746 kW) in capacity shall be of the electronically commutated or permanent split capacitor-type or shall be 3-phase motors.
Exception: Fan motors in walk-in coolers and walk-in freezers combined in a single enclosure greater than 3,000 square feet (279 m2) in floor area are exempt.
- Antisweat heaters that are not provided with anti-sweat heater controls shall have a total door rail, glass and frame heater power draw not greater than 7.1 W/ft2 (76 W/m2) of door opening for walk-in freezers, and not greater than 3.0 W/ft2 (32 W/m2) of door opening for walk-in coolers.
- Antisweat heater controls shall be configured to reduce the energy use of the antisweat heater as a function of the relative humidity in the air outside the door or to the condensation on the inner glass pane.
- Light sources shall have an efficacy of not less than 40 lumens per Watt, including any ballast losses, or shall be provided with a device that automatically turns off the lights within 15 minutes of when the walk-in cooler or walk-in freezer was last occupied.
Effective January 1, 2020, walk-in coolers and walk-in freezers shall meet the requirements of Tables C403.10.2.1(1), C403.10.2.1(2) and C403.10.2.1(3).
WALK-IN COOLER AND FREEZER DISPLAY DOOR EFFICIENCY REQUIREMENTSa
| CLASS DESCRIPTOR | CLASS | MAXIMUM ENERGY CONSUMPTION (kWh/day)a |
| Display door, medium temperature | DD, M | 0.04 x Add + 0.41 |
| Display door, low temperature | DD, L | 0.15 x Add + 0.29 |
- Add is the surface area of the display door.
WALK-IN COOLER AND FREEZER NONDISPLAY DOOR EFFICIENCY REQUIREMENTSa
| CLASS DESCRIPTOR | CLASS | MAXIMUM ENERGY CONSUMPTION (kWh/day)a |
| Passage door, medium temperature | PD, M | 0.05 x And + 1.7 |
| Passage door, low temperature | PD, L | 0.14 x And + 4.8 |
| Freight door, medium temperature | FD, M | 0.04 x And + 1.9 |
| Freight door, low temperature | FD, L | 0.12 x And + 5.6 |
- And is the surface area of the nondisplay door.
WALK-IN COOLER AND FREEZER REFRIGERATION SYSTEM EFFICIENCY REQUIREMENTS
| CLASS DESCRIPTOR | CLASS | MINIMUM ANNUAL WALK-IN ENERGY FACTOR AWEF (Btu/W-h) |
| Dedicated condensing, medium temperature, indoor system | DC.M.I | 5.61 |
| Dedicated condensing, medium temperature, indoor system, > 9,000 Btu/h capacity | DC.M.I, > 9,000 | 5.61 |
| Dedicated condensing, medium temperature, outdoor system | DC.M.I | 7.60 |
| Dedicated condensing, medium temperature, outdoor system, > 9,000 Btu/h capacity | DC.M.I, > 9,000 | 7.60 |