Repairs and Refurbishment of 03 No. VRV (Variable Refrigerant Volume) Systems at MMABM Associated Hospital of GMC Anantnag.

Supply, installation, and commissioning of electronically actuated expansion valve motors (Part No. S4012522) conforming to Daikin specs. Includes system calibration to maintain subcooling/superheat balance per IS 8148.

Supply and installation of 5-pin thermistors (Part No. S2093130) per IS 554 standards for sensor connections. Thermistors rated -20°C to +120°C, NTC type. System response optimized to Daikin VRV protocol logic.

Supply and replacement of OEM-certified high-pressure sensors (Part No. S2229326) tested as per ISO 5149. Range 0–4.5 MPa with overload protection. Wiring and functional verification included.

Supply and fitting of low-pressure sensors (Part No. S6024295) with output characteristics compatible with inverter logic boards. Units calibrated to IS 12300 for pressure instrumentation.

Replacement of inverter PCB 1 (S4012619), a power-side IGBT module conforming to IS/IEC 60947-4. Complete heat sink bonding, harmonic protection per OEM design.

Replacement of logic inverter PCB 2 (S4012620), handling phase detection, feedback control, and compressor modulation. Installation per OEM layout drawings. Surge-protected to IS 13252.

Supply and installation of Fan PCB 1 (S4012622) with pulse-width modulation (PWM) drive per IEC 60730. Includes vibration-resistant terminal connections and thermal overload check.

Supply and installation of Fan PCB 2 (S4012621), responsible for secondary condenser fan sequencing. EMC compliance verified to IS 14700.

Installation of main control PCB (S4901631), coordinating VRV logic network (LAN protocol). Tested under simulated operating loads. Circuit integrity verified per IS 10617 (Part 1).

Replacement of condenser fan blades (S2098320), aerodynamically balanced aluminum alloy conforming to IS 655. Diameter ~660mm. Installed using anti-vibration fasteners.

Supply and replacement of input EMI noise filters (S4012544) with ISI-marked components per IS 13703. Ensures uninterrupted signal flow across inverter terminals.

Supply and laying of outdoor unit harness wiring, weather-resistant, shielded (as per IS 694), terminated with ISI-marked lugs and enclosed in UV-resistant flexible conduit.

Supply and brazing of Refnet joints (Daikin Type 73T), UL-listed Y-branches designed for equal refrigerant flow to branches. Installation via silver alloy brazing, nitrogen-purged per ASHRAE 15.

Laying and brazing of 28mm outer dia copper pipe, Type 'L' conforming to ASTM B280 and IS 10773. Includes nitrile insulation of Class-O fire rating.

Laying and brazing of 15mm outer dia copper pipe, pressure-rated for VRV refrigerants. Seamless draw tubing per IS 2501, with insulation wrap and supports.

Supply and charging of R410A refrigerant (HFC blend), IS 8148 Grade 1, moisture-free and cylinder certified. Filling with digital vacuum gauge and recovery unit.

Nitrogen leak testing using ISI-certified cylinders at 42-bar pressure as per IS 12300 guidelines. Includes pressure hold verification and certification report.