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Refrigeration equipment performance shall be determined in accordance with Sections C403.11.1 and C403.11.2 for commercial refrigerators, freezers, refrigerator-freezers, walk-in coolers, walk-in freezers and refrigeration equipment.  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.
Exception: Walk-in coolers and walk-in freezers regulated under federal law in accordance with Subpart R of DOE 10 CFR 431.
C403.11.1 Commercial Refrigerators, Refrigerator-Freezers and Refrigeration
Refrigeration equipment, defined in DOE 10 CFR Part 431.62, shall have an energy use in kWh/day not greater than the values of Table C403.11.1 when tested and rated in accordance with AHRI Standard 1200.
TABLE C403.11.1
MINIMUM EFFICIENCY REQUIREMENTS: COMMERCIAL REFRIGERATORS AND FREEZERS AND REFRIGERATION
EQUIPMENT CATEGORY CONDENSING UNIT CONFIGURATION EQUIPMENT FAMILY RATING TEMP., °F OPERATING TEMP., °F EQUIPMENT CLASSIFICATIONa, c MAXIMUM DAILY ENERGY CONSUMPTION,

kWh/dayd, e
TEST STANDARD
Remote condensing commercial refrigerators and commercial freezers Remote (RC) Vertical open (VOP) 38 (M) ≥ 32 VOP.RC.M 0.64 × TDA + 4.07 AHRI 1200
0 (L) < 32 VOP.RC.L 2.20 × TDA + 6.85
Semivertical open (SVO) 38 (M) ≥ 32 SVO.RC.M 0.66 × TDA + 3.18
0 (L) < 32 SVO.RC.L 2.20 × TDA + 6.85
Horizontal open (HZO) 38 (M) ≥ 32 HZO.RC.M 0.35 × TDA + 2.88
0 (L) < 32 HZO.RC.L 0.55 × TDA + 6.88
Vertical closed transparent (VCT) 38 (M) ≥ 32 VCT.RC.M 0.15 × TDA + 1.95
0 (L) < 32 VCT.RC.L 0.49 × TDA + 2.61
Horizontal closed transparent (HCT) 38 (M) ≥ 32 HCT.RC.M 0.16 × TDA + 0.13
0 (L) < 32 HCT.RC.L 0.34 × TDA + 0.26
Vertical closed solid (VCS) 38 (M) ≥ 32 VCS.RC.M 0.10 × V + 0.26
0 (L) < 32 VCS.RC.L 0.21 × V + 0.54
Horizontal closed solid (HCS) 38 (M) ≥ 32 HCS.RC.M 0.10 × V + 0.26
0 (L) < 32 HCS.RC.L 0.21 × V + 0.54
Service over counter (SOC) 38 (M) ≥ 32 SOC.RC.M 0.44 × TDA + 0.11
0 (L) < 32 SOC.RC.L 0.93 × TDA + 0.22
Self-contained commercial refrigerators and commercial freezers with and without doors Self-contained

(SC)
Vertical open (VOP) 38 (M) ≥ 32 VOP.SC.M 1.69 × TDA + 4.71 AHRI 1200
0 (L) < 32 VOP.SC.L 4.25 × TDA + 11.82
Semivertical open (SVO) 38 (M) ≥ 32 SVO.SC.M 1.70 × TDA + 4.59
0 (L) < 32 SVO.SC.L 4.26 × TDA + 11.51
Horizontal open (HZO) 38 (M) ≥ 32 HZO.SC.M 0.72 × TDA + 5.55
0 (L) < 32 HZO.RC.L 1.90 × TDA + 7.08
Vertical closed transparent (VCT) 38 (M) ≥ 32 VCT.SC.M 0.10 × V + 0.86
0 (L) < 32 VCT.SC.L 0.29 × V + 2.95
Vertical closed solid (VCS) 38 (M) ≥ 32 VCS.SC.M 0.05 × V + 1.36
0 (L) < 32 VCS.SC.L 0.22 × V + 1.38
Horizontal closed transparent (HCT) 38 (M) ≥ 32 HCT.SC.M 0.06 × V + 0.37
0 (L) < 32 HCT.SC.L 0.08 × V + 1.23
Horizontal closed solid (HCS) 38 (M) ≥ 32 HCS.SC.M 0.05 × V + 0.91
0 (L) < 32 HCS.SC.L 0.06 × V + 1.12
Service over counter (SOC) 38 (M) ≥ 32 SOC.SC.M 0.52 × TDA + 1.00
0 (L) < 32 SOC.SC.L 1.10 × TDA + 2.10
Self-contained commercial refrigerators with transparent doors for pull-down temperature applications Self-contained

(SC)
Pull-down (PD) 38 (M) ≥ 32 PD.SC.M 0.11 × V + 0.81 AHRI 1200
Commercial ice cream freezers Remote (RC) Vertical open (VOP) -15 (I) ≤ -5b VOP.RC.I 2.79 × TDA + 8.70 AHRI 1200
Semivertical open (SVO) SVO.RC.I 2.79 × TDA + 8.70
Horizontal open (HZO) HZO.RC.I 0.70 × TDA + 8.74
Vertical closed transparent (VCT) VCT.RC.I 0.58 × TDA + 3.05
Horizontal closed transparent (HCT) HCT.RC.I 0.40 × TDA + 0.31
Vertical closed solid (VCS) VCS.RC.I 0.25 × V + 0.63
Horizontal closed solid (HCS) HCS.RC.I 0.25 × V + 0.63
Service over counter (SOC) SOC.RC.I 1.09 × TDA + 0.26
Self-contained

(SC)
Vertical open (VOP) VOP.SC.I 5.40 × TDA + 15.02 AHRI 1200
Semivertical open (SVO) SVO.SC.I 5.41 × TDA + 14.63
Horizontal open (HZO) HZO.SC.I 2.42 × TDA + 9.00
Vertical closed transparent (VCT) VCT.SC.I 0.62 × TDA + 3.29
Horizontal closed transparent (HCT) HCT.SC.I 0.56 × TDA + 0.43
Vertical closed solid (VCS) VCS.SC.I 0.34 × V + 0.88
Horizontal closed solid (HCS) HCS.SC.I 0.34 × V + 0.88
Service over counter (SOC) SOC.SC.I 1.53 × TDA + 0.36
For SI: 1 square foot = 0.0929 m2, 1 cubic foot = 0.02832 m3, °C = (°F — 32)/1.8.
  1. The meaning of the letters in this column is indicated in the columns to the left.
  2. Ice cream freezer is defined in DOE 10 CFR 431.62 as a commercial freezer that is designed to operate at or below -5 °F and that the manufacturer designs, markets or intends for the storing, displaying or dispensing of ice cream.
  3. Equipment class designations consist of a combination [in sequential order separated by periods (AAA).(BB).(C)] of the following:
    1. •  (AAA)—An equipment family code (VOP = vertical open, SVO = semivertical open, HZO = horizontal open, VCT = vertical closed transparent doors, VCS = vertical closed solid doors, HCT = horizontal closed transparent doors, HCS = horizontal closed solid doors, and SOC = service over counter); 
    2. •  (BB)—An operating mode code (RC = remote condensing and SC = self-contained); and
    3. •  (C)—A rating temperature code [M = medium temperature (38°F), L = low temperature (0°F), or I = ice cream temperature (-15°F)]. 
    4. •  For example, "VOP.RC.M" refers to the "vertical open, remote condensing, medium temperature" equipment class.
  4. V is the volume of the case (ft3) as measured in AHRI 1200, Appendix C.
  5. TDA is the total display area of the case (ft2) as measured in AHRI 1200, Appendix D.
C403.11.2 Walk-in Coolers and Walk-in Freezers
Walk-in cooler and walk-in freezer refrigeration systems, except for walk-in process cooling refrigeration systems as defined in DOE 10 CFR 431.302, shall meet the requirements of Tables C403.11.2.1(1), C403.11.2.1(2) and C403.11.2.1(3).
C403.11.2.1 Performance Standards
Walk-in coolers and walk-in freezers shall meet the requirements of Tables C403.11.2.1(1), C403.11.2.1(2) and C403.11.2.1(3).
TABLE C403.11.2.1(1)
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 × Add + 0.41
Display door, low temperature DD, L 0.15 × Add + 0.29
  1. 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 × And + 1.7
Passage door, low temperature PD, L 0.14 × And + 4.8
Freight door, medium temperature FD, M 0.04 × And + 1.9
Freight door, low temperature FD, L 0.12 × And + 5.6
  1. 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)a TEST PROCEDURE
Dedicated condensing, medium temperature, indoor system DC.M.I 5.61 AHRI 1250
Dedicated condensing, medium temperature, outdoor system DC.M.O 7.60
Dedicated condensing, low temperature, indoor system, net capacity (qnet) < 6,500 Btu/h DC.L.I, < 6,500 9.091 × 10-5 × qnet + 1.81
Dedicated condensing, low temperature, indoor system, net capacity (qnet) ≥ 6,500 Btu/h DC.L.I, ≥ 6,500 2.40
Dedicated condensing, low temperature, outdoor system, net capacity (qnet) < 6,500 Btu/h DC.L.O, < 6,500 6.522 × 10-5 × qnet + 2.73
Dedicated condensing, low temperature, outdoor system, net capacity (qnet) ≥ 6,500 Btu/h DC.L.O, ≥ 6,500 3.15
Unit cooler, medium UC.M 9.00
Unit cooler, low temperature, net capacity (qnet) < 15,500 Btu/h UC.L, < 15,500 1.575 × 10-5 × qnet + 3.91
Unit cooler, low temperature, net capacity (qnet) ≥ 15,500 Btu/h UC.L, ≥ 15,500 4.15
For SI: 1 British thermal unit per hour = 0.2931 W.
  1. qnet is net capacity (Btu/h) as determined in accordance with AHRI 1250.
C403.11.3 Refrigeration Systems
Refrigerated display cases, walk-in coolers or walk-in freezers that are served by remote compressors and remote condensers not located in a condensing unit, shall comply with Sections C403.11.3.1 and C403.11.3.2.
Exception: Systems where the working fluid in the refrigeration cycle goes through both subcritical and super-critical states (transcritical) or that use ammonia refrigerant are exempt.
C403.11.3.1 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).
C403.11.3.2 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 (29.3 kW) with a design-saturated suction temperature of -10°F (-23°C) or lower. The sub-cooled 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 C403.11.3.
  3. Compressors that incorporate internal or external crankcase heaters shall provide a means to cycle the heaters off during compressor operation.

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