EXCEPTION: | The following alterations need not comply with the requirements for new construction provided the energy use of the building is not increased: |
1. Storm windows installed over existing fenestration. | |
2. Surface applied window film installed on existing single pane fenestration assemblies to reduce solar heat gain provided the code does not require the glazing fenestration to be replaced. | |
3. Existing ceiling, wall or floor cavities exposed during construction provided that these cavities are insulated to full depth with insulation having a minimum nominal value of R-3.0 per inch installed per Section C402. | |
4. Construction where the existing roof, wall or floor cavity is not exposed. | |
5. Roof recover. | |
6. Air barriers shall not be required for roof recover and roof replacement where the alterations or renovations to the building do not include alterations, renovations or repairs to the remainder of the building envelope. | |
7. Replacement of existing doors that separate conditioned space from the exterior shall not require the installation of a vestibule or revolving door, provided however that an existing vestibule that separates a conditioned space from the exterior shall not be removed. |
EXCEPTION: | Buildings or spaces that were permitted prior to the 2009 Washington state energy code, or were originally permitted as unconditioned, may comply with this section as follows: |
1. Where the component performance alternative in Section C402.1.5 is used to demonstrate compliance with this Section, the Proposed Total UA is allowed to be up to 110 percent of the Allowable Total UA. This exception may be applied to the project area alone, or to the existing building and project area combined as a whole building. | |
2. Where total building performance in accordance with Section C407 is used to demonstrate compliance with this Section, the total annual carbon emissions from energy consumption of the proposed design is allowed to be up to 110 percent of the annual carbon emissions from energy consumption allowed by Section C407.3. This exception may be applied to the project area alone, or to the existing building and project area combined as a whole building. |
EXCEPTION: | Air leakage testing is not required for alterations and repairs, unless the project includes a change in space conditioning according to Section C503.2 or a change of occupancy or use according to Section C505.1. |
EXCEPTION: | Additional envelope upgrades are included in the project so the addition of vertical fenestration does not cause a reduction in overall building energy efficiency, as approved by the code official. |
EXCEPTION: | An area-weighted average of the U-factor of replacement fenestration products being installed in the building for each fenestration product category listed in Table C402.4 shall be permitted to satisfy the U-factor requirements for each fenestration product category listed in Table C402.4. Individual fenestration products from different product categories listed in Table C402.4 shall not be combined in calculating the area-weighted average U-factor. |
EXCEPTION: | Additional envelope upgrades are included in the project so the addition of skylights does not cause a reduction in overall building energy efficiency, as approved by the code official. |
EXCEPTIONS: | 1. Existing mechanical systems which are altered or where parts of the systems are replaced are not required to be modified to comply with Section C403.3.5 as long as mechanical cooling capacity is not added to a system that did not have cooling capacity prior to the alteration. |
2. Alternate mechanical system designs that are not in full compliance with this code may be approved when the code official determines that existing building constraints including, but not limited to, available mechanical space, limitations of the existing structure, or proximity to adjacent air intakes or exhausts makes full compliance impractical. Alternate designs shall include additional energy saving strategies not prescriptively required by this code for the scope of the project including, but not limited to, demand control ventilation, energy recovery, or increased mechanical cooling or heating equipment efficiency above that required by Tables C403.3.2(1) through C403.3.2(12). | |
3. Only those components of existing HVAC systems that are altered or replaced shall be required to meet the requirements of Section C403.8.1, Allowable fan motor horsepower. Components replaced or altered shall not exceed the fan power limitation pressure drop adjustment values in Table C403.8.1(2) at design conditions. Section C403.8.1 does not require the removal and replacement of existing system ductwork. |
EXCEPTIONS: | 1. Qualifying small equipment: Economizers are not required for cooling units and split systems serving one zone with a total cooling capacity rated in accordance with Section C403.3.2 of less than 33,000 Btu/h (hereafter referred to as qualifying small systems) provided that these are high-efficiency cooling equipment with SEER and EER values more than 15 percent higher than minimum efficiencies listed in Tables C403.3.2 (1) through (3), in the appropriate size category, using the same test procedures. Equipment shall be listed in the appropriate certification program to qualify for this exception. The total capacity of all qualifying small equipment without economizers shall not exceed 72,000 Btu/h per building, or 5 percent of the building total air economizer capacity, whichever is greater. |
Notes and exclusions for Exception 1: | |
1.1. The portion of the equipment serving Group R occupancies is not included in determining the total capacity of all units without economizers in a building. | |
1.2. Redundant units are not counted in the capacity limitations. | |
1.3. This exception shall not be used for the initial tenant improvement of a shell-and-core building or space, or for Total Building Performance in accordance with Section C407. | |
1.4. This exception shall not be used for unitary cooling equipment installed outdoors or in a mechanical room adjacent to the outdoors. | |
2. Chilled water terminal units connected to systems with chilled water generation equipment with IPLV values more than 25 percent higher than minimum part load equipment efficiencies listed in Table C403.3.2(7), in the appropriate size category, using the same test procedures. Equipment shall be listed in the appropriate certification program to qualify for this exception. The total capacity of all systems without economizers shall not exceed 480,000 Btu/h per building, or 20 percent of the building total air economizer capacity, whichever is greater. | |
Notes and exclusions for Exception 2: | |
2.1. The portion of the equipment serving Group R occupancy is not included in determining the total capacity of all units without economizers in a building. | |
2.2. This exception shall not be used for the initial tenant improvement of a shell-and-core building or space, or for total building performance in accordance with Section C407. |
Option A | Option B (alternate to A) | Option C (alternate to A) | Option D (alternate to A) | |
Unit Type | Any alteration with new or replacement equipment | Replacement unit of the same type with the same or smaller output capacity | Replacement unit of the same type with a larger output capacity | New equipment added to existing system or replacement unit of a different type |
1. Packaged Units | Efficiency: min. a Economizer: C403.5b | Efficiency: min. a Economizer: C403.5b | Efficiency: min. a Economizer: C403.5b | Efficiency: min. a Economizer: C403.5b |
2. Split Systems | Efficiency: min. a Economizer: C403.5b | For units ≤ 60,000 Btuh, comply with two of two measures: 1. Efficiency: + 10%e 2. Economizer: shall not decrease existing economizer capability | For units ≤ 60,000 Btuh replacing unit installed prior to 1991 comply with at least one of two measures: 1. Efficiency: + 10%e 2. Economizer: 50% f | Efficiency: min. a Economizer: C403.5b |
For all other capacities: Efficiency: min.a Economizer: C403.5b | For all other capacities: Efficiency: min.a Economizer: C403.5b | |||
3. Water Source Heat Pump | Efficiency: min. a Economizer: C403.5b | For units ≤ 72,000 Btuh, comply with at least two of three measures: 1. Efficiency: +10%e 2. Flow control valve g 3. Economizer: 50% f | For units ≤ 72,000 Btuh, comply with at least three of three measures: 1. Efficiency: +10%e 2. Flow control valve g 3. Economizer: 50% f (except for certain pre-1991 systems q) | Efficiency: min. a Economizer: C403.5b (except for certain pre-1991 systems q) |
For all other capacities: Efficiency: min.a Economizer: C403.5b | For all other capacities: Efficiency: min.a Economizer: C403.5b | |||
4. Water Economizer using Air-Cooled Heat Rejection Equipment (Dry Cooler) | Efficiency: min. a Economizer: C403.5b | Efficiency: + 5%d Economizer: shall not decrease existing economizer capacity | Efficiency: min.a Economizer: C403.5b | Efficiency: min. a Economizer: C403.5b |
5. Air-Handling Unit (including fan coil units) where the system has an air-cooled chiller | Efficiency: min. a Economizer: C403.5b | Economizer: shall not decrease existing economizer capacity | Efficiency: min.a Economizer: C403.5b (except for certain pre-1991 systems q) | Efficiency: min.a Economizer: C403.5b (except for certain pre-1991 systems q) |
6. Air-Handling Unit (including fan coil units) and Water-cooled Process Equipment, where the system has a water-cooled chiller10 | Efficiency: min. a Economizer: C403.5b | Economizer: shall not decrease existing economizer capacity | Efficiency: min.a Economizer: C403.5b (except for certain pre-1991 systems q and certain 1991-2016 systems i) | Efficiency: min. a Economizer: C403.5b (except for certain pre-1991 systems q and certain 1991-2016 systems i) |
7. Cooling Tower | Efficiency: min. a Economizer: C403.5b | No requirements | Efficiency: min.a Economizer: C403.5b | Efficiency: min.a Economizer: C403.5b |
8. Air-Cooled Chiller | Efficiency: min. a Economizer: C403.5b | Efficiency: + 10%k Economizer: shall not decrease existing economizer capacity | Efficiency: Comply with two of two measures: 1. + 10% k,l and 2. Multistage compressor(s) Economizer: shall not decrease existing economizer capacity | Efficiency: min. a Economizer: C403.5b |
9. Water-Cooled Chiller | Efficiency: min. a Economizer: C403.5b | Efficiency: Comply with at least one of two measures: 1. Part load IPLV + 15%n or 2. Plate frame heat exchanger o Economizer: shall not decrease existing economizer capacity | Efficiency: Comply with two of two measures: 1. Part load IPLV + 15% n 2. Plate-frame heat exchanger o Economizer: shall not decrease existing economizer capacity | Efficiency: min. a Economizer: C403.5b |
a | Minimum equipment efficiency shall comply with Section C403.3.2 and Tables C403.3.2(1) through C403.3.3.2(12). | |
b | All separate new equipment and replacement equipment shall have air economizer complying with Section C403.5 including both the individual unit size limits and the total building capacity limits on units without economizer. It is acceptable to comply using one of the exceptions to Section C403.5. | |
c | Reserved. | |
d | Equipment shall have a capacity-weighted average cooling system efficiency that is 5% better than the requirements in Tables C403.3.2(1) and C403.3.2(2) (1.05 x values in Tables C403.3.2(1) and C403.3.2(2)). | |
e | Equipment shall have a capacity-weighted average cooling system efficiency that is 10% better than the requirements in Tables C403.3.2(1)A and C403.3.2(2) (1.10 x values in Tables C403.3.2(1)A and C403.3.2(2)). | |
f | Minimum of 50% air economizer that is ducted in a fully enclosed path directly to every heat pump unit in each zone, except that ducts may terminate within 12 inches of the intake to an HVAC unit provided that they are physically fastened so that the outside air duct is directed into the unit intake. If this is an increase in the amount of outside air supplied to this unit, the outside air supply system shall be configured to provide this additional outside air and be equipped with economizer control. | |
g | Water-source heat pump systems shall have a flow control valve to eliminate flow through the heat pumps that are not in operation and variable speed pumping control complying with Section C403.4.3 for that heat pump. | |
- When the total capacity of all units with flow control valves exceeds 15% of the total system capacity, a variable frequency drive shall be installed on the main loop pump. | ||
- As an alternate to this requirement, the capacity-weighted average cooling system efficiency shall be 5% better than the requirements in footnote e for water-source heat pumps (i.e., a minimum of 15% greater than the requirements in Table C403.3.2(2)). | ||
h | Water economizer equipment shall have a capacity-weighted average cooling system efficiency that is 10% better than the requirements in Tables C403.3.2(8) and C403.3.2(9) (1.10 x values in Tables C403.3.2(8) and C403.3.2(9)). | |
i | Air economizer is not required for systems installed with water economizer plate and frame heat exchanger complying with previous codes between 1991 and June 2016, provided that the total fan coil load does not exceed the existing or added capacity of the heat exchangers. | |
j | For water-cooled process equipment where the manufacturers specifications require colder temperatures than available with waterside economizer, that portion of the load is exempt from the economizer requirements. | |
k | The air-cooled chiller shall have an IPLV efficiency that is a minimum of 10% greater than the IPLV requirements in EER in Table C403.3.2(7)(1.10 x IPLV values in EER in Table C403.3.2(7)). | |
l | The air-cooled chiller shall be multistage with a minimum of two compressors. | |
m | The water-cooled chiller shall have full load and part load IPLV efficiency that is a minimum of 5% greater than the IPLV requirements in Table C403.2.3(7). | |
n | The water-cooled chiller shall have an IPLV value that is a minimum of 15% lower than the IPLV requirements in Table C403.2.3(7) (1.15 x IPLV values in Table C403.3.2(7)). Water-cooled centrifugal chillers designed for nonstandard conditions shall have an NPLV value that is at least 15% lower than the adjusted maximum NPLV rating in kW per ton defined in Section C403.3.2.1 (1.15 x NPLV). | |
o | Economizer cooling shall be provided by adding a plate-frame heat exchanger on the waterside with a capacity that is a minimum of 20% of the chiller capacity at standard AHRI rating conditions. | |
p | Reserved. | |
q | Systems installed prior to 1991 without fully utilized capacity are allowed to comply with Option B, provided that the individual unit cooling capacity does not exceed 90,000 Btuh. | |
EXCEPTIONS: | 1. Where an alteration project impacts an area smaller than 5,000 square feet, controlled receptacles are not required. |
2. Where existing systems furniture or partial-height relocatable office cubical partitions are reconfigured or relocated within the same area, controlled receptacles are not required in the existing systems furniture or office cubicle partitions. | |
3. Where new or altered receptacles meet the exception to Section C405.10, they are not required to be controlled receptacles or be located within 12 inches of noncontrolled receptacles. |
EXCEPTION: | The following alterations need not comply with the requirements for new construction provided the energy use of the building is not increased: |
1. Storm windows installed over existing fenestration. | |
2. Surface applied window film installed on existing single pane fenestration assemblies to reduce solar heat gain provided the code does not require the glazing fenestration to be replaced. | |
3. Existing ceiling, wall or floor cavities exposed during construction provided that these cavities are insulated to full depth with insulation having a minimum nominal value of R-3.0 per inch installed per Section C402. | |
4. Construction where the existing roof, wall or floor cavity is not exposed. | |
5. Roof recover. | |
6. Air barriers shall not be required for roof recover and roof replacement where the alterations or renovations to the building do not include alterations, renovations or repairs to the remainder of the building envelope. | |
7. Replacement of existing doors that separate conditioned space from the exterior shall not require the installation of a vestibule or revolving door, provided however that an existing vestibule that separates a conditioned space from the exterior shall not be removed. |
EXCEPTION: | Buildings or spaces that were permitted prior to the 2009 Washington state energy code, or were originally permitted as unconditioned, may comply with this section as follows: |
1. Where the component performance alternative in Section C402.1.5 is used to demonstrate compliance with this Section, the Proposed Total UA is allowed to be up to 110 percent of the Allowable Total UA. This exception may be applied to the project area alone, or to the existing building and project area combined as a whole building. | |
2. Where total building performance in accordance with Section C407 is used to demonstrate compliance with this Section, the total annual carbon emissions from energy consumption of the proposed design is allowed to be up to 110 percent of the annual carbon emissions from energy consumption allowed by Section C407.3. This exception may be applied to the project area alone, or to the existing building and project area combined as a whole building. |
EXCEPTION: | Air leakage testing is not required for alterations and repairs, unless the project includes a change in space conditioning according to Section C503.2 or a change of occupancy or use according to Section C505.1. |
EXCEPTION: | Additional envelope upgrades are included in the project so the addition of vertical fenestration does not cause a reduction in overall building energy efficiency, as approved by the code official. |
EXCEPTION: | An area-weighted average of the U-factor of replacement fenestration products being installed in the building for each fenestration product category listed in Table C402.4 shall be permitted to satisfy the U-factor requirements for each fenestration product category listed in Table C402.4. Individual fenestration products from different product categories listed in Table C402.4 shall not be combined in calculating the area-weighted average U-factor. |
EXCEPTION: | Additional envelope upgrades are included in the project so the addition of skylights does not cause a reduction in overall building energy efficiency, as approved by the code official. |
EXCEPTIONS: | 1. Existing mechanical systems which are altered or where parts of the systems are replaced are not required to be modified to comply with Section C403.3.5 as long as mechanical cooling capacity is not added to a system that did not have cooling capacity prior to the alteration. |
2. Alternate mechanical system designs that are not in full compliance with this code may be approved when the code official determines that existing building constraints including, but not limited to, available mechanical space, limitations of the existing structure, or proximity to adjacent air intakes or exhausts makes full compliance impractical. Alternate designs shall include additional energy saving strategies not prescriptively required by this code for the scope of the project including, but not limited to, demand control ventilation, energy recovery, or increased mechanical cooling or heating equipment efficiency above that required by Tables C403.3.2(1) through C403.3.2(12). | |
3. Only those components of existing HVAC systems that are altered or replaced shall be required to meet the requirements of Section C403.8.1, Allowable fan motor horsepower. Components replaced or altered shall not exceed the fan power limitation pressure drop adjustment values in Table C403.8.1(2) at design conditions. Section C403.8.1 does not require the removal and replacement of existing system ductwork. |
EXCEPTIONS: | 1. Qualifying small equipment: Economizers are not required for cooling units and split systems serving one zone with a total cooling capacity rated in accordance with Section C403.3.2 of less than 33,000 Btu/h (hereafter referred to as qualifying small systems) provided that these are high-efficiency cooling equipment with SEER and EER values more than 15 percent higher than minimum efficiencies listed in Tables C403.3.2 (1) through (3), in the appropriate size category, using the same test procedures. Equipment shall be listed in the appropriate certification program to qualify for this exception. The total capacity of all qualifying small equipment without economizers shall not exceed 72,000 Btu/h per building, or 5 percent of the building total air economizer capacity, whichever is greater. |
Notes and exclusions for Exception 1: | |
1.1. The portion of the equipment serving Group R occupancies is not included in determining the total capacity of all units without economizers in a building. | |
1.2. Redundant units are not counted in the capacity limitations. | |
1.3. This exception shall not be used for the initial tenant improvement of a shell-and-core building or space, or for Total Building Performance in accordance with Section C407. | |
1.4. This exception shall not be used for unitary cooling equipment installed outdoors or in a mechanical room adjacent to the outdoors. | |
2. Chilled water terminal units connected to systems with chilled water generation equipment with IPLV values more than 25 percent higher than minimum part load equipment efficiencies listed in Table C403.3.2(7), in the appropriate size category, using the same test procedures. Equipment shall be listed in the appropriate certification program to qualify for this exception. The total capacity of all systems without economizers shall not exceed 480,000 Btu/h per building, or 20 percent of the building total air economizer capacity, whichever is greater. | |
Notes and exclusions for Exception 2: | |
2.1. The portion of the equipment serving Group R occupancy is not included in determining the total capacity of all units without economizers in a building. | |
2.2. This exception shall not be used for the initial tenant improvement of a shell-and-core building or space, or for total building performance in accordance with Section C407. |
Option A | Option B (alternate to A) | Option C (alternate to A) | Option D (alternate to A) | |
Unit Type | Any alteration with new or replacement equipment | Replacement unit of the same type with the same or smaller output capacity | Replacement unit of the same type with a larger output capacity | New equipment added to existing system or replacement unit of a different type |
1. Packaged Units | Efficiency: min. a Economizer: C403.5b | Efficiency: min. a Economizer: C403.5b | Efficiency: min. a Economizer: C403.5b | Efficiency: min. a Economizer: C403.5b |
2. Split Systems | Efficiency: min. a Economizer: C403.5b | For units ≤ 60,000 Btuh, comply with two of two measures: 1. Efficiency: + 10%e 2. Economizer: shall not decrease existing economizer capability | For units ≤ 60,000 Btuh replacing unit installed prior to 1991 comply with at least one of two measures: 1. Efficiency: + 10%e 2. Economizer: 50% f | Efficiency: min. a Economizer: C403.5b |
For all other capacities: Efficiency: min.a Economizer: C403.5b | For all other capacities: Efficiency: min.a Economizer: C403.5b | |||
3. Water Source Heat Pump | Efficiency: min. a Economizer: C403.5b | For units ≤ 72,000 Btuh, comply with at least two of three measures: 1. Efficiency: +10%e 2. Flow control valve g 3. Economizer: 50% f | For units ≤ 72,000 Btuh, comply with at least three of three measures: 1. Efficiency: +10%e 2. Flow control valve g 3. Economizer: 50% f (except for certain pre-1991 systems q) | Efficiency: min. a Economizer: C403.5b (except for certain pre-1991 systems q) |
For all other capacities: Efficiency: min.a Economizer: C403.5b | For all other capacities: Efficiency: min.a Economizer: C403.5b | |||
4. Water Economizer using Air-Cooled Heat Rejection Equipment (Dry Cooler) | Efficiency: min. a Economizer: C403.5b | Efficiency: + 5%d Economizer: shall not decrease existing economizer capacity | Efficiency: min.a Economizer: C403.5b | Efficiency: min. a Economizer: C403.5b |
5. Air-Handling Unit (including fan coil units) where the system has an air-cooled chiller | Efficiency: min. a Economizer: C403.5b | Economizer: shall not decrease existing economizer capacity | Efficiency: min.a Economizer: C403.5b (except for certain pre-1991 systems q) | Efficiency: min.a Economizer: C403.5b (except for certain pre-1991 systems q) |
6. Air-Handling Unit (including fan coil units) and Water-cooled Process Equipment, where the system has a water-cooled chiller10 | Efficiency: min. a Economizer: C403.5b | Economizer: shall not decrease existing economizer capacity | Efficiency: min.a Economizer: C403.5b (except for certain pre-1991 systems q and certain 1991-2016 systems i) | Efficiency: min. a Economizer: C403.5b (except for certain pre-1991 systems q and certain 1991-2016 systems i) |
7. Cooling Tower | Efficiency: min. a Economizer: C403.5b | No requirements | Efficiency: min.a Economizer: C403.5b | Efficiency: min.a Economizer: C403.5b |
8. Air-Cooled Chiller | Efficiency: min. a Economizer: C403.5b | Efficiency: + 10%k Economizer: shall not decrease existing economizer capacity | Efficiency: Comply with two of two measures: 1. + 10% k,l and 2. Multistage compressor(s) Economizer: shall not decrease existing economizer capacity | Efficiency: min. a Economizer: C403.5b |
9. Water-Cooled Chiller | Efficiency: min. a Economizer: C403.5b | Efficiency: Comply with at least one of two measures: 1. Part load IPLV + 15%n or 2. Plate frame heat exchanger o Economizer: shall not decrease existing economizer capacity | Efficiency: Comply with two of two measures: 1. Part load IPLV + 15% n 2. Plate-frame heat exchanger o Economizer: shall not decrease existing economizer capacity | Efficiency: min. a Economizer: C403.5b |
a | Minimum equipment efficiency shall comply with Section C403.3.2 and Tables C403.3.2(1) through C403.3.3.2(12). | |
b | All separate new equipment and replacement equipment shall have air economizer complying with Section C403.5 including both the individual unit size limits and the total building capacity limits on units without economizer. It is acceptable to comply using one of the exceptions to Section C403.5. | |
c | Reserved. | |
d | Equipment shall have a capacity-weighted average cooling system efficiency that is 5% better than the requirements in Tables C403.3.2(1) and C403.3.2(2) (1.05 x values in Tables C403.3.2(1) and C403.3.2(2)). | |
e | Equipment shall have a capacity-weighted average cooling system efficiency that is 10% better than the requirements in Tables C403.3.2(1)A and C403.3.2(2) (1.10 x values in Tables C403.3.2(1)A and C403.3.2(2)). | |
f | Minimum of 50% air economizer that is ducted in a fully enclosed path directly to every heat pump unit in each zone, except that ducts may terminate within 12 inches of the intake to an HVAC unit provided that they are physically fastened so that the outside air duct is directed into the unit intake. If this is an increase in the amount of outside air supplied to this unit, the outside air supply system shall be configured to provide this additional outside air and be equipped with economizer control. | |
g | Water-source heat pump systems shall have a flow control valve to eliminate flow through the heat pumps that are not in operation and variable speed pumping control complying with Section C403.4.3 for that heat pump. | |
- When the total capacity of all units with flow control valves exceeds 15% of the total system capacity, a variable frequency drive shall be installed on the main loop pump. | ||
- As an alternate to this requirement, the capacity-weighted average cooling system efficiency shall be 5% better than the requirements in footnote e for water-source heat pumps (i.e., a minimum of 15% greater than the requirements in Table C403.3.2(2)). | ||
h | Water economizer equipment shall have a capacity-weighted average cooling system efficiency that is 10% better than the requirements in Tables C403.3.2(8) and C403.3.2(9) (1.10 x values in Tables C403.3.2(8) and C403.3.2(9)). | |
i | Air economizer is not required for systems installed with water economizer plate and frame heat exchanger complying with previous codes between 1991 and June 2016, provided that the total fan coil load does not exceed the existing or added capacity of the heat exchangers. | |
j | For water-cooled process equipment where the manufacturers specifications require colder temperatures than available with waterside economizer, that portion of the load is exempt from the economizer requirements. | |
k | The air-cooled chiller shall have an IPLV efficiency that is a minimum of 10% greater than the IPLV requirements in EER in Table C403.3.2(7)(1.10 x IPLV values in EER in Table C403.3.2(7)). | |
l | The air-cooled chiller shall be multistage with a minimum of two compressors. | |
m | The water-cooled chiller shall have full load and part load IPLV efficiency that is a minimum of 5% greater than the IPLV requirements in Table C403.2.3(7). | |
n | The water-cooled chiller shall have an IPLV value that is a minimum of 15% lower than the IPLV requirements in Table C403.2.3(7) (1.15 x IPLV values in Table C403.3.2(7)). Water-cooled centrifugal chillers designed for nonstandard conditions shall have an NPLV value that is at least 15% lower than the adjusted maximum NPLV rating in kW per ton defined in Section C403.3.2.1 (1.15 x NPLV). | |
o | Economizer cooling shall be provided by adding a plate-frame heat exchanger on the waterside with a capacity that is a minimum of 20% of the chiller capacity at standard AHRI rating conditions. | |
p | Reserved. | |
q | Systems installed prior to 1991 without fully utilized capacity are allowed to comply with Option B, provided that the individual unit cooling capacity does not exceed 90,000 Btuh. | |
EXCEPTIONS: | 1. Where an alteration project impacts an area smaller than 5,000 square feet, controlled receptacles are not required. |
2. Where existing systems furniture or partial-height relocatable office cubical partitions are reconfigured or relocated within the same area, controlled receptacles are not required in the existing systems furniture or office cubicle partitions. | |
3. Where new or altered receptacles meet the exception to Section C405.10, they are not required to be controlled receptacles or be located within 12 inches of noncontrolled receptacles. |