HVAC System for Janki Devi Memorial College Library, New Delhi

Supplying, installation, testing and commissioning of modular type Variable Refrigerant Flow / Variable Refrigerant Volume (VRF/VRV) air-cooled outdoor unit(s) suitable for cooling/heating, having 100% hermetically sealed inverter-type twin rotary/scroll compressor(s) — minimum two compressors with individual separate PCB for above 14 HP modules — microprocessor-based controller, top-discharge type condensing unit(s) with R-410A refrigerant or equivalent, vibration isolators with suitable foundation etc. complete as required. Condenser fan shall be capable of operating at different speeds with respect to load. The condenser shall be coated with hydrophilic film to prevent water accumulation, enhance water dispersion, reduce degradation and improve performance and durability. The unit shall deliver rated capacity in conformity with IS 18728:2024 and CPWD Specifications and shall work even at 50°C ambient temperature without tripping, delivering 100% rated capacity up to 39°C. Suitable for 400V ±10%, 3-phase, 50 Hz AC supply and BMS-compatible. Unit shall be filled with first charge of refrigerant and ready for use. ISEER of the unit shall be as per Energy Conservation and Sustainable Building Code (ECSBC) 2024 (for capacity <40 kWr ISEER 5.4; capacity ≥40 and <70 kWr ISEER 5.5; capacity ≥70 kWr ISEER 5.6 for ECSBC building). Including all inter-connections, piping connections, power and control wiring terminations at unit, vibration isolation pads, weather-proof canopy/guard if on open terrace, refrigerant charging beyond factory pre-charge for extended piping as applicable, and all accessories as per CPWD specifications, complete in all respects. Capacity: 14 HP to 22 HP range. Configuration: 2 nos. × 22 HP Heat Pump ODU = 44 HP total for 43.8 TR IDU load (Connection Ratio = 118%). Location: terrace-level AHU/ODU room.

Supplying, installation, testing and commissioning of 0.8 TR (minimum capacity) 4-way cassette-type indoor ceiling-mounted unit equipped with synthetic washable media pre-filter, fan section with low-noise dynamically balanced blower, multi-speed motor, coil section with DX copper coil, electronic expansion valve (EEV), outer cabinet, built-in drain pump (minimum 750 mm lift), decorative square grille panel with anti-condensation lining, necessary ceiling supports and suspension hardware, vibration isolation pads, corded remote controller etc., suitable for operation on single-phase 230V ±10%, 50 Hz AC supply, complete as required. The indoor unit must shut down upon receiving a signal from the BMS system / fire alarm signals. The system shall be capable of adjusting airflow as per room requirement in auto mode. Cooling capacity rated at air inlet conditions of 27°C DB and 19°C WB temperature. Make shall be same OEM as outdoor unit. Including refrigerant piping connections at unit, condensate drain connection, control wiring termination, ceiling opening reinforcement if required, and all accessories as per CPWD specifications, complete in all respects. Location: Internet Room (6.67 sq.m) — 1 no.

Supplying, installation, testing and commissioning of 1.0 TR (minimum capacity) 4-way cassette-type indoor ceiling-mounted unit equipped with synthetic washable media pre-filter, fan section with low-noise dynamically balanced blower, multi-speed motor, coil section with DX copper coil, electronic expansion valve (EEV), outer cabinet, built-in drain pump (minimum 750 mm lift), decorative square grille panel with anti-condensation lining, necessary ceiling supports and suspension hardware, vibration isolation pads, corded remote controller etc., suitable for operation on single-phase 230V ±10%, 50 Hz AC supply, complete as required. The indoor unit must shut down upon receiving a signal from the BMS system / fire alarm signals. The system shall be capable of adjusting airflow as per room requirement in auto mode. Cooling capacity rated at air inlet conditions of 27°C DB and 19°C WB temperature. Make shall be same OEM as outdoor unit. Including refrigerant piping connections at unit, condensate drain connection, control wiring termination, ceiling opening reinforcement if required, and all accessories as per CPWD specifications, complete in all respects. Locations: Library Office (14.45 sq.m), Entrance Lobby (14.55 sq.m), Research Room-1 (16.2 sq.m), Research Room-2 (12.3 sq.m), Research Room-3 (14.5 sq.m) — 5 nos.

Supplying, installation, testing and commissioning of 2.0 TR (minimum capacity) 4-way cassette-type indoor ceiling-mounted unit equipped with synthetic washable media pre-filter, fan section with low-noise dynamically balanced blower, multi-speed motor, coil section with DX copper coil, electronic expansion valve (EEV), outer cabinet, built-in drain pump (minimum 750 mm lift), decorative square grille panel with anti-condensation lining, necessary ceiling supports and suspension hardware, vibration isolation pads, corded remote controller etc., suitable for operation on single-phase 230V ±10%, 50 Hz AC supply, complete as required. The indoor unit must shut down upon receiving a signal from the BMS system / fire alarm signals. The system shall be capable of adjusting airflow as per room requirement in auto mode. Cooling capacity rated at air inlet conditions of 27°C DB and 19°C WB temperature. Make shall be same OEM as outdoor unit. Including refrigerant piping connections at unit, condensate drain connection, control wiring termination, ceiling opening reinforcement if required, and all accessories as per CPWD specifications, complete in all respects. Locations: Librarian Room (25 sq.m, 1 no.), GF Book Store (151.93 sq.m, 4 nos.), FF Book Store (150 sq.m, 4 nos.) — 9 nos. total.

Supplying, installation, testing and commissioning of 10.0 TR (minimum capacity) high-static ducted-type indoor unit with minimum 78 Pa external static pressure (ESP), comprising DX copper coil, electronic expansion valve (EEV), blower/fan section with dynamically balanced centrifugal fan, multi-speed ECM/inverter motor, return air filter section with G4-grade washable synthetic media filter, vibration isolation mounts, drain tray with drain connection, factory-wired control board, and all necessary accessories. Suitable for operation on single-phase 230V ±10%, 50 Hz AC supply. The indoor unit must shut down upon receiving a signal from the BMS system / fire alarm signals. Make shall be same OEM as outdoor unit. Including ceiling suspension arrangement with anti-vibration hangers, flexible duct connectors at supply and return, refrigerant piping connections at unit, condensate drain connection with trap, control wiring termination, access provision for filter maintenance, and all accessories complete in all respects as per CPWD specifications. For double-height reading hall (AHU-1 and AHU-2) — 2 nos.

Supplying, installation, testing and commissioning of Energy Recovery Ventilator (ERV) — enthalpy-type heat recovery wheel, rated at 1000 CFM (minimum), comprising supply and exhaust fans with EC/inverter motors, enthalpy recovery wheel with minimum 70% total energy recovery efficiency at rated conditions (as per ASHRAE 84), integrated microprocessor-based controller with defrost and filter-change indication, G4-grade washable pre-filter on outdoor air intake side, motor-operated fresh air and exhaust air dampers, drain tray with connection, vibration isolation mounts, and factory-wired control panel. Casing shall be double-skin insulated (25 mm minimum) with thermal break. BMS-compatible (Modbus/BACnet). Including all ductwork connections with flexible connectors at inlet and outlet, condensate drain piping from unit to nearest drain point, ceiling/wall suspension arrangement, power supply termination, control wiring, and all accessories complete in all respects. . For fresh air ventilation to double-height reading hall — 1 no.

Supplying, installation, testing and commissioning of Y-branch / T-branch / multi-joints (refnet joints) for connecting indoor units to refrigerant piping network. Joints shall be of same Original Equipment Manufacturer (OEM) make as of ODUs and IDUs. Including all brazing, nitrogen purging during brazing, insulation of joints with Class-O closed-cell nitrile rubber insulation of same thickness as adjoining pipe insulation, leak testing at each joint with electronic leak detector, and all accessories as per manufacturer's installation manual and CPWD specifications, complete in all respects. Total IDUs = 17 nos.; approximately 19 refnet joints required as per piping layout.

Supplying, installation, testing and commissioning of outdoor multi-joints (header joints) for combining multiple outdoor unit modules into a single refrigerant piping system. Joints shall be of same Original Equipment Manufacturer (OEM) make as of ODUs. Including all brazing, nitrogen purging during brazing, insulation of joints with Class-O closed-cell nitrile rubber insulation of same thickness as adjoining pipe insulation, leak testing at each joint with electronic leak detector, and all accessories as per manufacturer's installation manual and CPWD specifications, complete in all respects. For combining 2 nos. ODU modules — 2 nos.

Supplying, installation, testing and commissioning including vacuumisation and nitrogen pressure testing of 34.9 mm OD (hard drawn) copper refrigerant piping with tube wall thickness of 1.62 mm (minimum) for VRF/VRV system, complete with all fittings (elbows, tees, reducers, couplings), brazing with silver-bearing brazing alloy under continuous nitrogen purging, suitable adjustable ring-type hanger supports at maximum 1.5 m centres, insulated with Class-O closed-cell elastomeric nitrile rubber tubular insulation of 19 mm thick for suction lines and 9 mm thick for liquid lines (or as per manufacturer's recommendation for pipe size), with all joints in insulation sealed using nitrile rubber adhesive and 50 mm wide self-adhesive nitrile rubber tape, vapour barrier maintained throughout. Including pipe clamps with rubber lining to prevent copper-to-steel contact, fire-stop sealant at all wall/slab penetrations, and all accessories as per CPWD specifications and manufacturer's installation manual, complete in all respects.

Supplying, installation, testing and commissioning including vacuumisation and nitrogen pressure testing of 28.58 mm OD (hard drawn) copper refrigerant piping with tube wall thickness of 1.2 mm (minimum) for VRF/VRV system, complete with all fittings (elbows, tees, reducers, couplings), brazing with silver-bearing brazing alloy under continuous nitrogen purging, suitable adjustable ring-type hanger supports at maximum 1.5 m centres, insulated with Class-O closed-cell elastomeric nitrile rubber tubular insulation of 19 mm thick for suction lines and 9 mm thick for liquid lines (or as per manufacturer's recommendation for pipe size), with all joints in insulation sealed using nitrile rubber adhesive and 50 mm wide self-adhesive nitrile rubber tape, vapour barrier maintained throughout. Including pipe clamps with rubber lining to prevent copper-to-steel contact, fire-stop sealant at all wall/slab penetrations, and all accessories as per CPWD specifications and manufacturer's installation manual, complete in all respects.