bids are invited for repair, maintenance and installation of plant systems equipments - office space; hvac; service provider - a. repairing or replacing equipment like motors, pumps, pulleys, belts, compressors, gauges, instruments, filters, valves, piping, furnaces, boilers, or other appurtenances used to control the temperature, humidity, and air flow. b. dampers: lubricate bearings; check for proper operation; adjust and calibrate; clean surfaces; tighten connections. c. filters: clean and replace as required. d. heating and cooling coils: clean coils; check for leaks; inspect for corrosion. e. motor: inspect contacts and starter; check for vibration; tighten electrical connections; tighten mountings; lubricate motor. f. fan: clean and inspect; check for vibrations; check fan rotation. g. checking pump and motor shaft and coupling for alignment and tightness of nuts and bolts, parameter checking, calibration of sensors, flow switches replacement of defective parts, contactor cleaning / repairing, pcb working check up and repairing / replacement of defective pcb, and refrigerant leakage checkup total quantity :