Carrier 30HXC Installation, Operation And Maintenance Instructions

Also see for 30HXC Series: Installation, operation and maintenance instructions Installation, operation and maintenance instructions

Contents

Carrier 30HXC Installation, Operation And Maintenance Instructions Manual pdf 39 page image

3910 - MAJOR SYSTEM COMPONENTS ANDOPERATION DATA10.1 - Geared twin screw compressor• 30HXC units use 06N geared twin screw compressors.• Nominal capacities range from 137 to 281 kW (39 to 80tons). Economized or non economized models are useddepending on the 30HXC unit size.10.1.1 - Oil filterThe 06N screw compressor has an oil filter integral in thecompressor housing. This filter is field replaceable.10.1.2. - RefrigerantThe 06N screw compressor is specially designed to be used inR-134 a system only.10.1.3 - LubricantThe 06N screw compressor is approved for use with the followinglubricant: Carrier material spec PP 47-32.10.1.4 - Oil supply solenoid valveAn oil supply solenoid valve is standard on the compressor toisolate the compressor from oil flow when the compressor is notoperating.The oil solenoid is field replaceable.10.1.5 - Suction and economizer screensTo increase the reliability of the compressor, a screen has beenincorporated as a standard feature into suction and economizerinlets of the compressor.10.1.6 - Unloading systemThe 06NW screw compressor has an unloading system that isstandard on all compressors. This unloading system consists oftwo steps of unloading that decrease the compressor capacity byrerouting partially compressed gas back to suction.10.2 - Pressure vessels10.2.1 - Evaporator30HXC chillers use a flooded evaporator. The water circulates inthe tubes and the refrigerant is on the outside in the shell. Onevessel is used to serve both refrigerant circuits. There is a centertube sheet which separates the two refrigerant circuits. The tubesare 3/4” diameter copper with an enhanced surface inside andout. There is just one water circuit, and depending on the size ofthe chiller, there may be two or three water passes.At the top of the cooler are the two suction pipes, one in eachcircuit. Each has a flange welded to it, and the compressor mountson the flange.The evaporator shell has a thermal insulation of 19 mm thickpolyurethane foam and a water drain and purge. With the very lowtemperature option this insulation is 38 mm thick.10.2.2 - Condenser and oil separator30HXC chiller use a vessel that is a combination condenser andoil separator. It is mounted below the cooler. Discharge gas leavesthe compressor and flows through an external muffler to the oilseparator, which is the upper portion of the vessel. It enters thetop of the separator where oil is removed, and then flows to thebottom portion of the vessel, where gas is condensed andsubcooled. One vessel is used to serve both refrigerant circuits.There is a center tube sheet which separates the two refrigerantcircuits. The tubes are 3/4” or 1” diameter copper with enhancedsurface inside and out. There is just one water circuit with two waterpasses.The condenser shell can have a thermal insulation of 19 mm thickpolyurethane foam and a water drain and purge.