HVAC support in Indore that fits the design and construction workflow

SECTION 15800 - HVAC INSTALLATION SPECIFICATIONS PROJECT TYPE: PREMIUM RESIDENTIAL VILLA / APARTMENT PRIMARY SYSTEM CONFIGURATION: DAIKIN VRV SYSTEM (INVERTER VARIABLE REFRIGERANT) 1.0 SCOPE OF WORK 1.1 Supply, installation, testing, and commissioning of premium air conditioning systems utilizing eco-friendly refrigerant R-410A / R-32. 1.2 The contractor shall coordinate all slab sleeve coordinates, drain pipes, and ceiling access panels (minimum 450x450mm) prior to civil false ceiling framing. 2.0 REFRIGERANT COPPER PIPING 2.1 All refrigerant lines shall be solid-drawn seamless copper tubes conforming to ASTM B280 standards. 2.2 Piping thickness shall be 18 Gauge (1.2mm) for lines >= 5/8" and 20 Gauge (1.0mm) for smaller lines. 2.3 Insulation: Copper piping shall be insulated using Class-O Nitrile Rubber (19mm Wall Thickness). Suction and liquid lines must be insulated individually. Adhesives used shall be heavy-duty rubber-based neoprene contact adhesive. 2.4 Outdoor routing: Exposed copper piping on slabs/terraces must be enclosed within powder-coated GI casing trays with lockable lids. 3.0 CONDENSATE DRAINAGE PIPING 3.1 Drain piping shall be schedule 40 heavy-duty rigid PVC pipe (minimum outer diameter 25mm). 3.2 All horizontal drain piping runs must maintain a minimum uniform slope of 1:100 (1cm drop per meter of run). 3.3 For ceiling-concealed units without built-in drain pumps, a minimum 75mm deep U-trap must be fabricated on the drain exit line to prevent outdoor odor backdraft. 4.0 SHEET METAL DUCTING & GRILLS (IF APPLICABLE) 4.1 Supply and return air ducts shall be fabricated from Galvanized Iron (GI) sheets conforming to IS:277, thickness 24G (0.63mm) or 22G (0.80mm) as per duct dimension guidelines. 4.2 Hangers: Ducts must be suspended using threaded rods and structural MS angle brackets, insulated with neoprene pads to reduce vibration transfer. 4.3 Grills: Linear slot diffusers and supply air grills shall be manufactured from extruded aluminum sections, powder-coated in architectural white/matte black as selected by the Interior Designer. 5.0 TESTING, BALANCING & COMMISSIONING 5.1 Pressure Testing: After brazing joints using silver alloy under dry nitrogen purging, refrigerant piping must be pressurized with oxygen-free dry nitrogen at 41.5 kg/cm2 (590 PSI). The pressure must hold steady for a continuous period of 24 hours before vacuuming. 5.2 Vacuuming: Deep vacuuming down to 500 microns must be completed using a digital micron gauge. 5.3 Final Handover: Contractor must submit room-wise CFM readings, compressor run-amps logs, temperature delta sheets, and AMC schematics during final handover.