GAIL (India) Limited

2TECHNICAL SPECIFICATIONSA) AIR COOLED PACKAGE AIR CONDITIONER UNIT1.0 SCOPE:The scope of this section comprises supply, erection, testing and commissioning of selfcontainedSplit type package air-conditioning units and auxiliaries conforming to thesespecifications and in accordance with the drawings.2.0 PACKAGE UNITS:Air cooled, floor mounted free standing package unit shall be provided with scroll/reciprocatingcompressor complete with vibration isolators & factory installed controls (like HP & LPcutouts, inter locking of Fan & Compressor, Thermostat with selector switch etc) &accessories including wiring. Efficient cooling coil shall be selected for low velocity with3/8"/1/2" OD copper tubing having extended aluminium fins. Hydraulic expansion of tubesassures tight bonding between tubes & fins for high heat transfer. Tubes shall be arrangedin a staggered design for best air contact thus giving low bypass. The cooling coil circuits arefed with liquid refrigerant through the thermostatic expansion valve and a distributor Blowerof an evaporating unit shall be statically and dynamically balanced and shall be selected to giverequired airflow as identified in the drawings. Filters shall be minimum 25mm thick synthetictype or equivalent wire aluminium frame. Drain pan shall be of 18 gauge insulated withexpanded polyethylene sheet. Casing shall be as per the manufacturer's recommendationfactory painted to provide better protection against rusting.Remote air cooled condensing unit shall have to be most efficient condenser coils made out ofcopper tubing with extended aluminium fins. Tubes shall be arranged in a staggered design forbetter efficiency. Condenser fans shall be selected to operate quietly for required CFM to keepcondensing temperature low. The compressor may be in the indoor unit or with the outdoorunit, but, it should be capable of operating continuously even at high ambient of 46 0 C (115 0 F).Interconnected refrigerant piping between outdoor unit & indoor unit shall be of heavy gaugecopper complete with thermostatic expansion valve, liquid line strainer, drier, shut off valves,high & low pressure gauges including insulated suction line. 25mm thick neoprene rubber padsshall be supplied for each indoor/outdoor units. The units shall be tested in accordance with IS:1391.3.0 INSTALLATION:The indoor units shall be mounted on ribbed rubber pads for vibration isolation. The outdoor unitshall be installed with a steel base frame along with cushy best mounting vibration isolation pads.The refrigerant pipes & interconnecting cables & wires shall be neatly & firmly installed on 16SWG cable trays. The cable trays shall be rigidly supported from walls/slabs. Care shall betaken to avoid possibility of damage to cable/wires insulation due hot refrigerant pipes. Thecontractor shall supply the required charge of refrigerant, lubricant and other consumables, forcommissioning and testing of the equipment.