Installation of a Variable Refrigerant Flow (VRF) Air-conditioning

The Deputy High Commission of Canada (DHCC) to Nigeria in Lagos requests a mechanical engineering firm to install a Variable Refrigerant Flow (VRF) Air-conditioning (AC) system in the High Commission offices. Background The Deputy High Commission of Canada (DHCC) to Nigeria in Lagos is located at: 4 Anifowoshe Street, Victoria Island, Lagos. The building is occupied as office use on Ground and First floors. A TRANE Chiller provides chilled water to the internal chilled pipework and fan coil units and to the HVAC ductwork. Existing conditions The TRANE chiller requires costly repairs and parts replacement, and is not currently operating. The internal pipework runs in the ceiling voids and there are visible signs of rust and some corrosion to valves and joints. There have been previous incidents of leaking pipework, which has resulted in sections being repaired.  The Government of Canada instructed mechanical consultant engineer firm MFA Partnership to carry out an audit and survey of the system, this further confirmed the status of the existing conditions and provided recommendations and options to replace the system equipment. Objective To replace the current system with a new Variable Refrigerant Flow system (VRF) system; requiring decommission of the existing equipment, and replacing the chiller with new VRF Outdoor units and install new VRF Indoor units, plus all associated specified equipment. In addition, to introduce a Fresh-Air intake system. See design specification for details. The mechanical consultant engineer MFA partnerships have developed a Design package, providing layout drawings, general specification, material and equipment specification for the VRF AC system and Fresh –Air intake. The manufacturer of equipment specified in the Design is intended to set a benchmark standard for the quality of equipment and materials to be proposed. Therefore, it should be noted that equipment by other manufacture such as, DAIKIN, CARRIER, MITSUBISHI shall be considers as equal approved, but must be of reputable industry standard and be capable of having local approved contractor(s) with aftersales support and access to OEM parts only * The complete details of the scope of work are identified in the drawings and specification noted below. CONTRACTOR GENERAL REQUIREMENTS The standard of work must be in line with industry standard references where applicable to the scope of works. Operatives involved in the performance of the works must be qualified in their field of mechanical and electrical expertise and for their individual tasks. Workmanship must be of a high quality standard in all areas of the installations, and Best Practices shall be applied at all times. Care must be taken to avoid damage to fixtures, fittings and finishes. Reinstatement will be required as necessary. Refer to the Design document M374 Installation Best Practices.