Description

• Projects in this scope area may include installing new heating, cooling and ventilation systems such as chilled water systems, cooling towers, direct expansion (DX) split air-cooled systems, packaged/rooftop units, water source heat pumps, central station air handlers, packaged terminal air conditioning, and window air conditioning units; and installing new indoor mounted variable refrigerant flow type air conditioning units and outdoor condensing units for both heating and cooling. The full, detailed scope of work for this project including any additional work areas will be updated here after alignment with project stakeholders through scoping and design activities. 

Baseline

• New heating, cooling and ventilation equipment shall be sized to meet the NYC Mechanical Code ventilation requirements and cooling and heating load calculations based on methods as recommended by ASHRAE handbooks   
• When sizing the HVAC Systems, designers shall calculate room by room heating and cooling loads for each space being air conditioned.  The calculations shall be utilized for equipment purchase. 
• All residential units and community facilities should receive a space cooling, heating and ventilation system, whether a centralized system or window or through-wall AC units. If window or through-wall AC units are selected, provide dedicated outlets for AC units. if required or indicated upgrade in-unit electrical capacity. Assume one AC unit per living area and bedroom. [PACT]. 

Stretch

• If a building’s windows are to be rehabbed, include the NYCHA-recommended partition and provide conveniently located dedicated wall outlets, per the NYC Electrical Code.
• Facilitate future apartment cooling. A hydronic chiller can be added in the basement or on the roof and use the same hydronic loop, requiring the use of fan coils in the apartments rather than fin tubes. [COMPMOD]
• Provide an electric heat pump system for space heating and cooling. [COMPMOD] [PACT]
  • System can be centralized or unitized, as appropriate to building typology and other project conditions.
  • Systems options include but are not limited to unitized heat pumps (PTHP, HPAC 2.0, CH4A window-integrated heat pump), centralized systems (VRF/VRV), and geothermal or ground-source heat pumps.
  • Include a summary of assumptions for lifecycle maintenance, service, & replacement.
  • Consider using existing steam risers for condensate drains.
• Provide cooling to units with packaged window heat pumps, which were developed for NYCHA as part of NYSERDA’s 2020 round of NextGen HVAC Program Opportunity Notices (PONs). [SA]
• Use heat pumps to provide heating, cooling, and potentially ventilation when electrifying buildings since they can be three to four times more efficient than resistance heat. [SA]

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Last Updated on October 21, 2024 at 1:21 pm

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23 05 00 - Common Work Results for HVAC

23 05 13 - Common Motor Requirements

23 05 29 - Hangers and Supports for HVAC Piping and Equipment

23 05 53 - Identification for HVAC Piping and Equipment

23 05 93 - Testing Adjusting and Balancing for HVAC

23 09 13 - Instrumentation and Control for HVAC

Diagrams

Details

S-DT_S-101_CONCRETE PAD DETAILS AND NOTES_NEW HVAC

Description

• Projects in this scope area may include installing air source heat pumps/devices with a fan, heating coil, a filter section, and provision for blending outside air for ventilation. The full, detailed scope of work for this project including any additional work areas will be updated here after alignment with project stakeholders through scoping and design activities.

Stretch

• Install electric heat pump systems for space heating and cooling for all buildings. The system can be centralized or unitized, as appropriate to building typology and other project conditions. [PACT]
  • Systems options include but are not limited to unitized heat pumps (PTHP, HPAC 2.0, CH4A window-integrated heat pump), centralized systems (VRF/VRV), and geothermal or ground-source heat pumps.
• Heat pumps having supplementary electric-resistance heat must have controls that prevent unnecessary supplemental heat operation. [COMPMOD]

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Last Updated on October 10, 2024 at 2:25 pm

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23 33 00 - Air Duct Accessories

Description

• Projects in this scope area may include installing ductwork components for HVAC systems and fume/smoke/grease exhaust systems, including ceiling and wall hangers, and air sealing of ductwork and penetrations. Penetrations through fire rated walls and ceiling shall be sealed to maintain the fire integrity of the structure. 
• All ductwork shall comply with most current applicable SMACNA standards, ASHRAE standards and NYC Codes.  
• The full, detailed scope of work for this project including any additional work areas will be updated here after alignment with project stakeholders through scoping and design activities. 

Baseline

• Drawing must provide a table listing all rooms which are part of HVAC Systems scope, minimum ventilation requirements per NYC Mechanical Code section 403, Table 403.3.1.1 and design air quantity showing compliance with the air quantity requirements to meet the code. 
• Install all systems and associated ductwork per the manufacturer’s recommendations. 
• Size ducts per ASHRAE recommendations. 
• Include a statement in drawings specifying that duct leakage testing shall be performed at either rough-in or post-construction, and the leakage shall be as prescribed by regulating Codes. [COMPMOD] 
• New or replacement heating and cooling equipment must meet or exceed the minimum efficiency rating required to meet NYC Energy Conservations Code (ECC). 
• Duct systems insulation in alterations must satisfy the minimum R-values in the applicable section of the ECC code, depending on the location of the ducts. [COMPMOD] 
• For heating/cooling systems pipes carrying fluids, drawings must specify the pipe insulation thickness per applicable Code tables. Piping insulation R-values must conform to Code prescriptions. [COMPMOD] 
• Provide comprehensive sealing, cleaning, and repair to existing mechanical ventilation systems. [COMPMOD] [PACT] 

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Last Updated on October 21, 2024 at 1:50 pm

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07 84 13 - Penetration Firestopping

23 05 00 - Common Work Results for HVAC

23 05 23 - General Duty Valves for HVAC Piping

23 05 29 - Hangers and Supports for HVAC Piping and Equipment

23 05 53 - Identification for HVAC Piping and Equipment

23 07 00 - HVAC Insulation

23 09 23 - Control Dampers

23 31 13 - Metal Ducts

23 33 00 - Air Duct Accessories

Description

• Heat recovery ventilators (HRV) and energy recovery ventilators (ERV) are air exchange systems that help to minimize heating and cooling energy costs. They recover energy before air being exhausted from the building and pre-treats the incoming ventilation air with the recovered energy. These mechanical systems use fans and coils to transfer energy from stale exhaust air being discharged to outdoor and pretreat the incoming ventilation air to reduce the heating and cooling energy requirements by building HVAC systems.  
• HRVs and ERVs are similar devices in that both supply air to occupied spaces and exhaust stale air while recovering energy from the exhaust air in the process. The primary difference between the two is that an HRV transfers heat while an ERV transfers both heat and moisture. 
• ERVs are typically used for cold-weather climates which require some humidification in the dry winter months. ERV’s have been used successfully to provide balanced ventilation for corridors, assembly spaces, and laundry rooms. 

Baseline

•  In-apartment ventilation must meet ASHRAE 62.2 standards.

Stretch

• Provide a preliminary cost estimate for 100% outdoor air supply in corridors and common areas (lobbies, etc.) in residential buildings. [COMPMOD]
• Consider upgrading supply ventilation within apartments with ERVs when doing dwelling for deep energy retrofits. System(s) can be centralized or unitized (per unit or per floor), or any combination as appropriate, in residential buildings. [COMPMOD] [PACT]
• Assume in-unit supply registers in all bedrooms and living spaces. [COMPMOD] [PACT]

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Last Updated on October 10, 2024 at 1:49 pm

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S-DT_S-101_CONCRETE PAD DETAILS AND NOTES_NEW HVAC

Description

• Properly sized and -balanced exhaust fans remove moisture-laden air, lowering the potential for mold growth and odor accumulation.
• Projects in this scope area may include installing exhaust fans, electrical lines, and switches in common areas. The full, detailed scope of work for this project including any additional work areas will be updated here after alignment with project stakeholders through scoping and design activities.

Baseline

• Kitchenettes (less than 80 square feet) must be provided with natural exhaust ventilation unless in accordance with the New York City Mechanical Code.
• All individual bathroom fans must be ENERGY STAR labeled, wired to turn on with the light switch, and equipped with a humidistat sensor, timer or other control (e.g., occupancy sensor, delay off switch, ventilation controller).
• Existing belt-driven rooftop fans should be replaced whenever possible with fans that use direct-drive motors (ECM motors for 300 to 2,000 cfm) and variable-speed control. VariGreen type variable speed motors as supplied by Greenheck Company are recommended for exhaust fans.
• Fan replacement should be concurrent with a clean-seal-and-balance scope of work on the ductwork, using techniques for sealing (aerosolized mastic, spot-spray mastic) ducts and balancing at each register (Constant Airflow Regulators, customized orifice plate) appropriate to the original construction materials.
• Elevator machine room ventilation requires an intake louver and a thermostatically controlled exhaust fan with gravity damper sized for 45 air changes per hour.
• Assume balanced mechanical exhaust ventilation in all community facilities. [COMPMOD]
• Exhaust-system upgrades should be made to units that are not code compliant. [COMPMOD] [PACT]
• Replace all existing exhaust registers. [COMPMOD] [PACT]
• Replace all rooftop fans with high-efficiency fans. Fans used to provide mechanical ventilation must meet or exceed the minimum system efficacies of the NYCECC. [COMPMOD] [PACT]

Stretch

• Whenever possible, modernizing ventilation should include converting the exhaust ventilation system to continuous whole-building operation, with airflow rate calculated per the ASHRAE 62.2 standards. Where such conversion is impractical, intermittent ventilation must be linked to occupancy (e.g. light switch) and provide no less than 50 CFM or per ASHRAE 62.2.
• Assume comprehensive air-sealing and unit compartmentalization. [COMPMOD]
• Provide outdoor intake and exhaust with gravity dampers that close when the ventilation system is not operating. [COMPMOD]
• Balance mechanical ventilation (supply & exhaust) for all residential units, corridors, common areas, and in all community facilities. [COMPMOD] [PACT]
• Upgrade mechanical ventilation systems for mold prevention. [SA]

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Last Updated on October 21, 2024 at 1:08 pm

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23 37 23 - Roof Accessories

23 39 00 - Fans and Accessories

23 51 00 - Chimney Liner

23 51 16 - Pre-Fabricated Breechings and Accessories

23 51 23 - Gas Vents

Description

• Projects in this scope area may include installing ventilation fans, electrical lines, and switches in common areas. The full, detailed scope of work for this project including any additional work areas will be updated here after alignment with project stakeholders through scoping and design activities.

Baseline

• Existing belt-driven rooftop fans should be replaced whenever possible with fans that use direct-drive motors (ECM motors for 300 to 2,000 cfm) and variable-speed control.  VariGreen type variable speed motors as supplied by Greenheck Company are recommended for exhaust fans. 
• Fan replacement should be concurrent with a clean-seal-and-balance scope of work on the ductwork, using techniques for sealing (aerosolized mastic, spot-spray mastic) ducts and balancing at each register (Constant Airflow Regulators, customized orifice plate) appropriate to the original construction materials. 
• Elevator machine room ventilation requires an intake louver and a thermostatically controlled exhaust fan with gravity damper sized for 45 air changes per hour. 
• Provide outdoor intake and exhaust with gravity dampers that close when the ventilation system is not operating. [COMPMOD] 
• Replace all rooftop fans with high-efficiency fans. Fans used to provide mechanical ventilation must meet or exceed the minimum system efficacies of the NYCECC. [COMPMOD] [PACT] 
• Incorporate passive supply ventilation via trickle vents in all windows. [COMPMOD] [PACT] 
• Provide 100% outdoor air supply (DOAS) in corridors and common areas (lobbies, etc.) in residential buildings. [PACT] 

Stretch

• Assume comprehensive air-sealing and unit compartmentalization. [COMPMOD]
• Balance mechanical ventilation (supply & exhaust) for all residential units, corridors, common areas, and in all community facilities. [COMPMOD] [PACT]
• Upgrade mechanical ventilation systems for mold prevention. [SA]

Strategies

Optimize Performance, Operation & Maintenance of Buildings, Systems & Assets

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Last Updated on October 10, 2024 at 1:57 pm

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Specifications

23 34 16 - Boiler Room Combustion Air Makeup and Ventilation System

23 37 23 - Roof Accessories

23 39 00 - Fans and Accessories

Description

• Projects in this scope area may include installing electric through wall or window heat pumps, supports and enclosures, supply lines, electrical outlets, and sealing and caulking of any masonry; electrical system upgrades; installing new windows; and removal of apartment radiators. The full, detailed scope of work for this project including any additional work areas will be updated here after alignment with project stakeholders through scoping and design activities.

Baseline

• Heat pumps having supplementary electric-resistance heat must have controls that prevent unnecessary supplemental heat operation. [COMPMOD]
•  

Stretch

• Convert through wall ACs to electric air source heat pumps. [SA]

Strategies

Optimize Performance, Operation & Maintenance of Buildings, Systems & Assets

Prioritize Sustainable Materials, Technologies & Practices

CompModSustainability AgendaCommercial BathroomsCommunity CentersCommercial Kitchens

Last Updated on October 10, 2024 at 2:31 pm