42/EE(BM-II)E/26-27(2nd Call)

Comprehensive Service and Overhauling of 3 Nos. 110 TR Carrier Chiller Plants including AHU Filters, Electrical Components, and Related HVAC Equipment Technical Description: This item covers the complete service and overhauling of three (3) Carrier air-cooled chiller plants, each of 110 TR capacity, along with their associated Air Handling Units (AHUs), filters, ductwork, and control systems. The scope of work includes dismantling and overhauling of compressor units, chemical descaling along with mechanical rodding of condenser/evaporator tubes of chiller plant including opening of end covers, tube cleaning, chemical circulation, flushing, neutralization, reassembly, testing, and commissioning, flushing and cleaning of evaporator coils, refrigerant leak detection and topping up, testing and servicing of electrical components such as control panels, contactors, sensors, and relays. It also includes comprehensive cleaning of filters in all connected AHUs (primary, secondary, and fine filters), blower motor lubrication, inspection for leakage and insulation condition, and calibration of BMS/ automation controls. Post- service, each system is tested under load and a service report is submitted

Supplying and charging of R-22 non-CFC refrigerant gas in the following capacity 30 ton after pressure testing with nitrogen gas, vacuuming etc. as required (Gas will be supplied by the contractor)

Supply and Replacement of 110 TR processor based EXV (Electronic Expansion valve) card to control the flow of refrigerant to the evaporator, allowing for precise temperature control and increased efficiency. The board receives input from sensors monitoring the chillers performance, adjust the Expansion valves position based on these signals and delivers the correct amount of refrigerant to the evaporator. For Plant No 1 and 2.

Supply and replacement of Mother Board PCB (Main Control Board) suitable for 1 × 110 TR chiller plant(plant no 1), compatible with existing chiller control system, comprising microprocessor-based control circuitry with necessary communication ports, relay outputs, sensor input terminals, display/control interface compatibility, and inbuilt safety logic for compressor protection, temperature control, pressure monitoring, fault diagnostics, and system sequencing. The motherboard PCB shall be OEM compatible, suitable for operation on 415V AC supply, capable of interfacing with compressor controls, thermostat/ temperature sensors, pressure switches, EXV controls, safeties, and associated field devices. The PCB shall include all necessary connectors, mounting arrangement, terminal interfaces, and programmable parameters required for proper functioning of the chiller plant. The item shall include necessary calibration, programming, parameter setting, testing, and commissioning for satisfactory operation of the chiller system. For Plant No 1 and 2

Supply and Replacement of processor based TCPM (Thermostat Compressor protection module) board in a chiller system is responsible for controlling and monitoring the compressor, primarily for protection and efficiency. It works by monitoring various parameters like temperature pressure, and current and then initiates appropriate actions based on these reading, such as starting, stoping or protecting the compressor. For Plant No 1

Supply and Replacement of 110 TR chiller processor based Fan PCB board having relays/contactors for switching the fan motors in ON/OFF state having overcurrent protection circuitry to prevent motor damage, having temperature sensor to display the condition of fan or motor, indicator LEd's to display operational status and faults and to communicate with compressor EXV PCB to synchronize the fan's operation with other components as required For Plant No 2