Specification & Code Library

HVAC & Mechanical Specifications

Tender-ready HVAC specifications tagged to the governing energy, ventilation and safety codes. Loads, efficiencies (IPLV/COP), air-change rates and equipment selection are project-specific and flagged for your MEP consultant.

IS 659 · Safety Code for Air Conditioning (IS 659:1964 — legacy/withdrawn; verify the current refrigerant-safety standard)
ECBC 2017 · Energy Conservation Building Code (Bureau of Energy Efficiency)
ASHRAE 90.1 · Energy Standard for Buildings Except Low-Rise Residential Buildings
ISHRAE · Indian Society of Heating, Refrigerating and Air Conditioning Engineers — standards & guidelines
ASHRAE 62.1 · Ventilation for Acceptable Indoor Air Quality
NBC 2016 Part 8 · National Building Code of India — Building Services (Mechanical Ventilation)

Drafting aid, not a stamped design. Every specification below is a starting point for your tender. Project-specific design values must be confirmed by a licensed engineer against the current code editions and the local authority before issue.

VRF / VRV System

IS 659 — Safety Code for Air Conditioning (IS 659:1964 — legacy/withdrawn; verify the current refrigerant-safety standard)
ECBC 2017 — Energy Conservation Building Code (Bureau of Energy Efficiency)
ASHRAE 90.1 — Energy Standard for Buildings Except Low-Rise Residential Buildings

What the code requires

Variable-refrigerant-flow systems must meet the minimum efficiency (IEER/COP) and controls requirements of ECBC 2017 / ASHRAE 90.1, with refrigerant safety to the current applicable standard (the older IS 659 has been superseded). Indoor design conditions and ventilation are set separately by ASHRAE 55 / 62.1.

Tender-ready specification

The VRF/VRV system shall be designed, installed, tested and commissioned in accordance with the Energy Conservation Building Code 2017 (BEE) and ASHRAE 90.1, the manufacturer's installation standards, and the current applicable refrigerant-safety standard (the older IS 659:1964 has been withdrawn).

Outdoor and indoor units shall be of an approved make meeting or exceeding the minimum efficiency (IEER/COP) required by ECBC 2017 / ASHRAE 90.1 for the applicable building tier. Refrigerant piping, charge limits and machine-room/leak-safety provisions shall comply with the current refrigerant-safety standard and the refrigerant safety group. Zoning, heat-recovery selection and the BMS/controls interface shall match the occupancy schedule. Heat-load calculations establishing capacity shall be confirmed by the MEP consultant.

Verify before issue — Cooling/heating loads, the minimum efficiency tier, refrigerant charge limits and ventilation rates are project-specific — confirm against ECBC 2017 (and any State ECBC notification), ASHRAE 90.1/62.1 current editions, and the current refrigerant-safety standard (note IS 659:1964 has been withdrawn).

Chilled-Water Plant (Chillers)

ECBC 2017 — Energy Conservation Building Code (Bureau of Energy Efficiency)
ASHRAE 90.1 — Energy Standard for Buildings Except Low-Rise Residential Buildings
ISHRAE — Indian Society of Heating, Refrigerating and Air Conditioning Engineers — standards & guidelines

What the code requires

ECBC 2017 / ASHRAE 90.1 set minimum chiller efficiency (COP / IPLV) and mandate measures such as VFD pumping and economisers above thresholds. ISHRAE guidelines inform plant configuration and chilled-water design.

Tender-ready specification

The chilled-water plant shall be designed, installed, tested and commissioned in accordance with the Energy Conservation Building Code 2017 (BEE), ASHRAE 90.1 and ISHRAE guidelines.

Chillers shall be of an approved make with full-load COP and part-load IPLV meeting or exceeding ECBC 2017 / ASHRAE 90.1 for the chiller type and capacity. Primary/secondary or variable-primary pumping with VFDs, cooling-tower selection and a BMS-integrated plant-room control sequence shall be provided as required by ECBC 2017. The plant shall be sized from a building heat-load study and life-cycle/energy analysis by the MEP consultant.

Verify before issue — Plant capacity (TR), the required COP/IPLV tier, pumping configuration and economiser thresholds are project-specific — confirm against ECBC 2017 / State ECBC and ASHRAE 90.1 current editions.

AHUs & Air Distribution

ASHRAE 62.1 — Ventilation for Acceptable Indoor Air Quality
ISHRAE — Indian Society of Heating, Refrigerating and Air Conditioning Engineers — standards & guidelines
NBC 2016 Part 8 — National Building Code of India — Building Services (Air Conditioning, Heating & Mechanical Ventilation)

What the code requires

ASHRAE 62.1 sets minimum outdoor-air (fresh-air) rates and filtration for indoor air quality; duct construction follows SMACNA/ISHRAE practice; NBC 2016 Part 8 governs the building-services context.

Tender-ready specification

Air-handling units and the air-distribution system shall be designed, installed, tested and balanced in accordance with ASHRAE 62.1 (Ventilation for Acceptable Indoor Air Quality), ISHRAE guidelines and the National Building Code of India 2016, Part 8.

AHUs shall be double-skin of an approved make with fan, coil and filtration selected for the design airflow and the minimum outdoor-air rate required by ASHRAE 62.1 for the occupancy. Ducting shall be SMACNA-class GI/aluminium, leak-tested, with VAV/CAV terminals, diffusers and dampers sized for the design CFM and throw. Testing, Adjusting & Balancing (TAB) shall validate airflow at handover.

Verify before issue — Outdoor-air (fresh-air) rates, filtration grade and airflow are occupancy-specific — confirm against ASHRAE 62.1 current edition and the project IAQ requirement.

Mechanical Ventilation (Car Park, Kitchen, Basement)

NBC 2016 Part 8 — National Building Code of India — Building Services (Mechanical Ventilation)
ASHRAE 62.1 — Ventilation for Acceptable Indoor Air Quality
IS 659 — Safety Code for Air Conditioning (IS 659:1964 — legacy/withdrawn; verify the current refrigerant-safety standard)

What the code requires

NBC 2016 Part 8 sets the air-change rates (ACH) and smoke-management requirements for enclosed car parks, basements and kitchens; ASHRAE 62.1 informs exhaust rates. CO-based control is required for car parks.

Tender-ready specification

Mechanical ventilation for enclosed car parks, basements and commercial kitchens shall be designed and installed in accordance with the National Building Code of India 2016, Part 8 and ASHRAE 62.1.

The supply/exhaust air-change rate (ACH) for each space shall be as required by NBC 2016 Part 8 for the use and volume, with CO-sensor-based demand control and smoke-extract mode for car parks/basements. Kitchen exhaust shall capture cooking effluent at source with appropriate hoods and make-up air. Fans, ducting and fire dampers shall be of approved make and rated for the duty.

Verify before issue — Air-change rates, smoke-extract capacity and CO set-points are space- and code-specific — confirm against NBC 2016 Part 8 (current edition), ASHRAE 62.1 and the local fire authority.

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HVAC & Mechanical Specifications

VRF / VRV System

Chilled-Water Plant (Chillers)

AHUs & Air Distribution

Mechanical Ventilation (Car Park, Kitchen, Basement)

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