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// CODE SNIPPET

C403.3.3 Air Economizers

New York State Energy Conservation Construction Code (NYSECCC) > 4 [CE] Commercial Energy Efficiency > C403 Building Mechanical Systems > C403.3 Economizers (Prescriptive) > C403.3.3 Air Economizers
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Air economizers shall comply with Sections C403.3.3.1 through C403.3.3.5.

C403.3.3.1 Design Capacity

Air economizer systems shall be capable of modulatingoutdoor air and return air dampers to provide up to 100 percent of the design supply air quantity as outdoor air for cooling.

C403.3.3.2 Control Signal

Economizer dampers shall be capable of being sequenced with the mechanical cooling equipment and shall not be controlled by only mixed-air temperature.

Exception: The use of mixed-air temperature limit control shall be permitted for systems controlled from space temperature (such as single-zone systems).

C403.3.3.3 High-Limit Shutoff

Air economizers shall be capable of automatically reducing outdoor air intake to the design minimum outdoor air quantity when outdoor air intake will no longer reduce cooling energy usage. High-limit shutoff control types for specific climates shall be chosen from Table C403.3.3.3. High-limit shutoff control settings for these control types shall be those specified in Table C403.3.3.3.

TABLE C403.3.3.3

HIGH-LIMIT SHUTOFF CONTROL SETTING FOR AIR ECONOMIZERSb

DEVICE TYPECLIMATE ZONEREQUIRED HIGH LIMIT
(ECONOMIZER OFF WHEN):
EquationDescription
Fixed dry bulb1B, 2B, 3B, 3C, 4B, 4C,
5B, 5C, 6B, 7, 8
TOA > 75°FOutdoor air temperature exceeds 75°F
5A, 6ATOA > 70°FOutdoor air temperature exceeds 70°F
1A, 2A, 3A, 4ATOA > 65°FOutdoor air temperature exceeds 65°F
Differential dry bulb1B, 2B, 3B, 3C, 4B, 4C, 5A,
5B, 5C, 6A, 6B, 7, 8
TOA > TRAOutdoor air temperature exceeds
return air temperature
Fixed enthalpy with fixed
dry-bulb temperatures
AllhOA > 28 Btu/lba or
TOA > 75°F
Outdoor air enthalpy exceeds
28 Btu/lb of dry aira or
Outdoor air temperature exceeds 75°F
Differential enthalpy with
fixed dry-bulb temperature
AllhOA > hRA or
TOA > 75°F
Outdoor air enthalpy exceeds
return air enthalpy or
Outdoor air temperature exceeds 75°F

For SI: 1 foot = 305 mm, °C = (°F - 32)/1.8, 1 Btu/lb = 2.33 kJ/kg.

  1. At altitudes substantially different than sea level, the fixed enthalpy limit shall be set to the enthalpy value at 75°F and 50-percent relative humidity. As an example, at approximately 6,000 feet elevation, the fixed enthalpy limit is approximately 30.7 Btu/lb.
  2. Devices with selectable setpoints shall be capable of being set to within 2°F and 2 Btu/lb of the setpoint listed.

C403.3.3.4 Relief of Excess Outdoor Air

Systems shall be capable of relieving excessoutdoor air during air economizer operation to prevent overpressurizing the building. The relief air outlet shall be located to avoid recirculation into the building.

C403.3.3.5 Economizer Dampers

Return, exhaust/relief and outdoor air dampers used in economizers shall comply with Section C403.2.4.3.

Related Code Sections


C403.3.3 [CE] Commercial Energy Efficiency, Air Economizers
Air economizers shall comply with Sections C403.3.3.1 through C403.3.3.5 ...
New York State Energy Conservation Construction Code (NYSECCC) > 4 [CE] Commercial Energy Efficiency > C403 Building Mechanical Systems > C403.3 Economizers (Prescriptive) > C403.3.3 Air Economizers
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2020 Energy Conservation Code of NYS > 4 [CE] Commercial Energy Efficiency > C403 Building Mechanical Systems > C403.5 Economizers (Prescriptive) > C403.5.3 Air Economizers
C403.5.3.1 [CE] Commercial Energy Efficiency, Design Capacity
Air economizer systems shall be configured to modulate outdoor air and return air dampers to provide up to 100 percent of the design supply air ...
2020 Energy Conservation Code of NYS > 4 [CE] Commercial Energy Efficiency > C403 Building Mechanical Systems > C403.5 Economizers (Prescriptive) > C403.5.3 Air Economizers > C403.5.3.1 Design Capacity
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Air economizers shall be configured to automatically reduce outdoor air intake to the design minimum outdoor air quantity when outdoor air ...
2020 Energy Conservation Code of NYS > 4 [CE] Commercial Energy Efficiency > C403 Building Mechanical Systems > C403.5 Economizers (Prescriptive) > C403.5.3 Air Economizers > C403.5.3.3 High-Limit Shutoff
C403.3.3.3 [CE] Commercial Energy Efficiency, High-Limit Shutoff
Air economizers shall be capable of automatically reducing outdoor air intake to the design minimum outdoor air quantity when outdoor air ...
New York State Energy Conservation Construction Code (NYSECCC) > 4 [CE] Commercial Energy Efficiency > C403 Building Mechanical Systems > C403.3 Economizers (Prescriptive) > C403.3.3 Air Economizers > C403.3.3.3 High-Limit Shutoff
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