C410.1 General. Walk-in coolers, walk-in freezers, refrigerated warehouse coolers, refrigerated warehouse freezers, and refrigerated display cases shall comply with this Section.
Refrigerated warehouse coolers and refrigerated warehouse freezers shall comply with Section C402. Section C402.1.5 Component performance alternative, may be used if granted prior approval by the jurisdiction.
C410.1.1 Refrigeration equipment performance. Refrigeration equipment shall have an energy use in kWh/day not greater than the values of Tables C410.1(1) and C410.1(2) when tested and rated in accordance with AHRI Standard 1200. The energy use shall be verified through certification under an approved certification program or, where a certification program does not exist, the energy use shall be supported by data furnished by the equipment manufacturer.
Table C410.1.1(1)
Minimum Efficiency Requirements: Commercial Refrigeration
EQUIPMENT TYPE | APPLICATION | ENERGY USE LIMITS (kWh per day)a | TEST PROCEDURE |
Refrigerator with solid doors | Holding Temperature | 0.10 x V + 2.04 | AHRI 1200 |
Refrigerator with transparent doors | 0.12 x V + 3.34 |
Freezers with solid doors | 0.40 x V + 1.38 |
Freezers with transparent doors | 0.75 x V + 4.10 |
Refrigerator/freezers with solid doors | The greater of 0.12 x V + 3.34 or 0.70 |
Commercial refrigerators | Pulldown | 0.126 x V + 3.51 |
a V = Volume of the chiller for frozen compartment as defined in AHAM-HRF-1. |
Table C410.1.1(2)
Minimum Efficiency Requirements: Commercial Refrigerators and Freezers
EQUIPMENT TYPE | ENERGY USE LIMITS (kWh per day)a,b | TEST PROCEDURE |
Equipment Classc | Family Code | Operating Mode | Rating Temperature |
VOP.RC.M | Vertical open | Remote condensing | Medium | 0.82 x TDA + 4.07 | AHRI 1200 |
SVO.RC.M | Semivertical open | Remote condensing | Medium | 0.83 x TDA + 3.18 | |
HZO.RC.M | Horizontal open | Remote condensing | Medium | 0.35 x TDA + 2.88 | |
VOP.RC.L | Vertical open | Remote condensing | Low | 2.27 x TDA + 6.85 | |
HZO.RC.L | Horizontal open | Remote condensing | Low | 0.57 x TDA + 6.88 | |
VCT.RC.M | Vertical transparent door | Remote condensing | Medium | 0.22 x TDA + 1.95 | |
VCT.RC.L | Vertical transparent door | Remote condensing | Low | 0.56 x TDA + 2.61 | |
SOC.RC.M | Service over counter | Remote condensing | Medium | 0.51 x TDA + 0.11 | |
VOP.SC.M | Vertical open | Self-contained | Medium | 1.74 x TDA + 4.71 | |
SVO.SC.M | Semivertical open | Self-contained | Medium | 1.73 x TDA + 4.59 | |
HZO.SC.M | Horizontal open | Self-contained | Medium | 0.77 x TDA + 5.55 | |
HZO.SC.L | Horizontal open | Self-contained | Low | 1.92 x TDA + 7.08 | |
VCT.SC.I | Vertical transparent door | Self-contained | Ice cream | 0.67 x TDA + 3.29 | |
VCS.SC.I | Vertical solid door | Self-contained | Ice cream | 0.38 x V + 0.88 | |
HCT.SC.I | Horizontal transparent door | Self-contained | Ice cream | 0.56 x TDA + 0.43 | |
SVO.RC.L | Semivertical open | Remote condensing | Low | 2.27 x TDA + 6.85 | |
VOP.RC.I | Vertical open | Remote condensing | Ice cream | 2.89 x TDA + 8.7 | |
SVO.RC.I | Semivertical open | Remote condensing | Ice cream | 2.89 x TDA + 8.7 | |
HZO.RC.I | Horizontal open | Remote condensing | Ice cream | 0.72 x TDA + 8.74 | |
VCT.RC.I | Vertical transparent door | Remote condensing | Ice cream | 0.66 x TDA + 3.05 | |
HCT.RC.M | Horizontal transparent door | Remote condensing | Medium | 0.16 x TDA + 0.13 | |
HCT.RC.L | Horizontal transparent door | Remote condensing | Low | 0.34 x TDA + 0.26 | |
HCT.RC.I | Horizontal transparent door | Remote condensing | Ice cream | 0.4 x TDA + 0.31 | |
VCS.RC.M | Vertical solid door | Remote condensing | Medium | 0.11 x V + 0.26 | |
VCS.RC.L | Vertical solid door | Remote condensing | Low | 0.23 x V + 0.54 | |
VCS.RC.I | Vertical solid door | Remote condensing | Ice cream | 0.27 x V + 0.63 | |
HCS.RC.M | Horizontal solid door | Remote condensing | Medium | 0.11 x V + 0.26 | |
HCS.RC.L | Horizontal solid door | Remote condensing | Low | 0.23 x V + 0.54 | |
HCS.RC.I | Horizontal solid door | Remote condensing | Ice cream | 0.27 x V + 0.63 | |
SOC.RC.L | Service over counter | Remote condensing | Low | 1.08 x TDA + 0.22 | |
SOC.RC.I | Service over counter | Remote condensing | Ice cream | 1.26 x TDA + 0.26 | |
VOP.SC.L | Vertical open | Self-contained | Low | 4.37 x TDA + 11.82 | |
VOP.SC.I | Vertical open | Self-contained | Ice cream | 5.55 x TDA + 15.02 | |
SVO.SC.L | Semivertical open | Self-contained | Low | 4.34 x TDA + 11.51 | |
SVO.SC.I | Semivertical open | Self-contained | Ice cream | 5.52 x TDA + 14.63 | |
HZO.SC.I | Horizontal open | Self-contained | Ice cream | 2.44 x TDA + 9.0 | |
SOC.SC.I | Service over counter | Self-contained | Ice cream | 1.76 x TDA + 0.36 | |
HCS.SC.I | Horizontal solid door | Self-contained | Ice cream | 0.38 x V + 0.88 | |
a | V = Volume of the case, as measured in accordance with Appendix C of AHRI 1200. |
b | TDA = Total display area of the case, as measured in accordance with Appendix D of AHRI 1200. |
c | Equipment class designations consist of a combination [(in sequential order separated by periods (AAA).(BB).(C))] of: |
| | (AAA) An equipment family code where: |
| | | VOP | = Vertical open |
| | | SVO | = Semi-vertical open |
| | | HZO | = Horizontal open |
| | | VCT | = Vertical transparent doors |
| | | VCS | = Vertical solid doors |
| | | HCT | = Horizontal transparent doors |
| | | HCS | = Horizontal solid doors |
| | | SOC | = Service over counter |
| | (BB) An operating mode code: |
| | | RC | = Remote condensing |
| | | SC | = Self-contained |
| | (C) A rating temperature code: |
| | | M | = Medium temperature (38°F) |
| | | L | = Low temperature (0°F) |
| | | I | = Ice cream temperature (15°F) |
| | For example, "VOP.RC.M" refers to the "vertical-open, remote-condensing, medium-temperature" equipment class. |
C410.2 Walk-in coolers, walk-in freezers, refrigerated warehouse coolers and refrigerated warehouse freezers.Refrigerated warehouse coolers, refrigerated warehouse freezers, and all walk-in coolers and walk-in freezers including site assembled, site constructed and prefabricated units shall comply with the following:
1. 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: | Automatic closers are not required for doors more than 45 inches (1143 mm) in width or more than 7 feet (2134 mm) in height. |
2. Doorways shall be provided with strip doors, curtains, spring-hinged doors or other method of minimizing infiltration when doors are open.
3. Walk-in coolers and refrigerated warehouse coolers shall be provided with wall, ceiling, and door insulation of not less than R-25 or have wall, ceiling and door assembly U-factors no greater than U-0.039. Walk-in freezers and refrigerated warehouse freezers shall be provided with wall, ceiling and door insulation of not less than R-32 or have wall, ceiling and door assembly U-factors no greater than U-0.030.
EXCEPTION: | Insulation is not required for glazed portions of doors or at structural members associated with the walls, ceiling or door frame. |
4. The floor of walk-in coolers shall be provided with floor insulation of not less than R-25 or have a floor assembly U-factor no greater than U-0.40. The floor of walk-in freezers shall be provided with floor insulation of not less than R-28 or have a floor assembly U-factor no greater than U-0.035.
EXCEPTION: | Insulation is not required in the floor of a walk-in cooler that is mounted directly on a slab on grade. |
5. Transparent fixed window and reach-in doors for walk-in freezers and windows in walk-in freezer doors shall be provided with triple-pane glass, with the interstitial spaces filled with inert gas or be provided with heat-reflective treated glass.
6. Transparent fixed window and reach-in doors for walk-in coolers and windows for walk-in coolers doors shall be provided with double-pane or triple-pane glass, with interstitial space filled with inert gas, or be provided with heat-reflective treated glass.
7. Evaporator fan motors that are less than 1 hp (0.746 kW) and less than 460 volts shall be provided with electronically commutated motors, brushless direct-current motors, or 3-phase motors.
8. Condenser fan motors that are less than 1 hp (0.746 kW) shall use electronically commutated motors, permanent split capacitor-type motors or 3-phase motors.
9. Antisweat heaters that are not provided with antisweat heater controls shall have a total door rail, glass and frame heater power draw of 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.
10. Where antisweat heater controls are provided, they shall be capable of reducing 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.
11. Lights in walk-in coolers, walk-in freezers, refrigerated warehouse coolers and refrigerated warehouse freezers shall either be provided with light sources with an efficacy of not less than 40 lumens per watt, including 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 space is not occupied.
C410.2.1Performance standards. Site-assembled and site-constructed walk-in coolers and walk-in freezers shall meet the requirements of Tables C410.2.1.1(1), C410.2.1.1(2), and C410.2.1.1(3).
Table C410.2.1.1(1)
Walk-in Cooler and Freezer Display Doors Efficiency Requirements
Class Description | 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 |
a | Add is the surface area of the display door. |
Table C410.2.1.1(2)
Walk-in Cooler and Freezer Nondisplay Doors Efficiency Requirements
Class Description | 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 |
a | And is the surface area of the display door. |
Table C410.2.1.1(3)
Walk-in Cooler and Freezer Refrigeration Systems Efficiency Requirements
Class Description | Class | Minimum Annual Walk-in Energy Factor AWEF (Btu/hW-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.MI | 7.60 |
Dedicated condensing, medium temperature, outdoor system, >9,000 Btu/h capacity | DC.M.I, >9,000 | 7.60 |
C410.2.2 Refrigerated display cases. Site-assembled or site-constructed refrigerated display cases shall comply with the following:
1. Lighting and glass doors in refrigerated display cases shall be controlled by one of the following:
1.1. Time switch controls to turn off lights during nonbusiness hours. Timed overrides for display cases shall turn the lights on for up to 1 hour and shall automatically time out to turn the lights off.
1.2. Motion sensor controls on each display case section that reduce lighting power by at least 50 percent within 3 minutes after the area within the sensor range is vacated.
2. 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 upon a time limit breach.
3. 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 to the condensation on the inner glass pane.
C410.3 Refrigeration systems. Refrigerated display cases, walk-in coolers or walk-in freezers that are served by remote compressor and remote condensers not located in a condensing unit, shall comply with Sections C410.4.1, C410.4.2, and C403.9.2.3.
EXCEPTION: | Systems where the working fluid in the refrigeration cycle goes through both subcritical and supercritical states (transcritical) or that use ammonia refrigerant are exempt. |
C410.3.1 Condensers serving refrigeration systems. Fan-powered condensers shall comply with the following:
1. The design saturated condensing temperatures for air-cooled condensers shall not exceed the design dry-bulb temperature plus 10°F (5.6°C) for low-temperature refrigeration systems, and the design dry-bulb temperature plus 15°F (8°C) for medium temperature refrigeration systems where the saturated condensing temperature for blend refrigerants shall be determined using the average of liquid and vapor temperatures as converted from the condenser drain pressure.
2. Condenser fan motors that are less than 1 hp (0.75 kW) shall use electronically commutated motors, permanent split-capacitor-type motors or 3-phase motors.
3. Condenser fans for air-cooled condensers, evaporatively cooled condensers, air- or water-cooled fluid coolers or cooling towers shall reduce fan motor demand to not more than 30 percent of design wattage at 50 percent of design air volume, and incorporate one of the following continuous variable speed fan control approaches:
3.1. Refrigeration system condenser control for air-cooled condensers shall use variable setpoint control logic to reset the condensing temperature setpoint in response to ambient dry-bulb temperature.
3.2. Refrigeration system condenser control for evaporatively cooled condensers shall use variable setpoint control logic to reset the condensing temperature setpoint in response to ambient wet-bulb temperature.
4. Multiple fan condensers shall be controlled in unison.
5. The minimum condensing temperature setpoint shall be not greater than 70°F (21°C).
C410.3.2 Compressor systems. Refrigeration compressor systems shall comply with the following:
1. Compressors and multiple-compressor system suction groups shall include control systems that use floating suction pressure control logic to reset the target suction pressure temperature based on the temperature requirements of the attached refrigeration display cases or walk-ins.
EXCEPTION: | Controls are not required for the following: |
| 1. Single-compressor systems that do not have variable capacity capability. |
| 2. Suction groups that have a design saturated suction temperature of 30°F (-1.1°C) or higher, suction groups that comprise the high stage of a two-stage or cascade system, or suction groups that primarily serve chillers for secondary cooling fluids. |
2. Liquid subcooling shall be provided for all low-temperature compressor systems with a design cooling capacity equal to or greater than 100,000 Btu/hr (29.3 kW) with a design-saturated suction temperature of -10°F (-23°C) or lower. The subcooled liquid temperature shall be controlled at a maximum temperature setpoint of 50°F (10°C) at the exit of the subcooler using either compressor economizer (interstage) ports or a separate compressor suction group operating at a saturated suction temperature of 18°F (-7.8°C) or higher.
2.1. Insulation for liquid lines with a fluid operating temperature less than 60°F (15.6°C) shall comply with Table C403.2.10.
3. Compressors that incorporate internal or external crankcase heaters shall provide a means to cycle the heaters off during compressor operation.
C410.4 Commissioning. Refrigeration systems shall be commissioned in accordance with Section C408.
EXCEPTION: | Self-contained units. |