RC(U)6 Installation and Maintenance Manual - Marine Refrigeration ...

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Refrigeration Division Grasso 3. DESCRIPTION AND OPERATION OF CAPACITY CONTROL page C1.8 Installation and Maintenance Manual RC(U)6 v001.99.01.en
Refrigeration Division 4.1 TECHNICAL DATA Table 4.1 Technical data COMPRESSOR TYPE RCF46/RCA46 RCF66/RCA66 RCF86/RCA86 Number of cylinders z 4 6 8 Cylinder arrangement 2 x V 2 x W 2 x VV Cylinder bore D mm 85 Piston stroke S mm 66 Direction of rotation both directions permitted Swept volume at full-load and n = 1450/min Vs m 3 /h 130.3 195.5 260.7 Standard compressor speeds (with V-belt drive) motor speed 1450/min (50 Hz) n min -1 810 - 855 - 905 - 1015 - 1140 - 1215 - 1285 - 1450 motor speed 1750/min (60 Hz) 800 - 875 - 980 - 1030 - 1095 - 1225 - 1380 - 1465 Standard steps of capacity control (expressed in percentage of full-load swept volume) 1 ) % 100 - 50 100 - 67 - 33 100 - 75 - 50 - 25 Main dimensions, connections and required free space Refer to par. 4.2. Mass of bare compressor (without flywheel and other accessories) Oil charge in crankcase (centre line of sight glass) 2 ) dm 3 kg 280 345 400 9.2 (8.5) 10.0 (9.3) 10.8 (10.1) Oil type to be used Refer to par. 4.3. Starting torque Refer to par. 4.7. Friction power at n = 1450/min and 55 o C oil temperature 3 ) Pw kW 1.10 1.53 2.22 Mass moment of inertia of crank mechanism (without flywheel) Centre of gravity and free forces and moments Torsional elastic substitute systems of crankshaft 4 ) Id kg.m 2 0.0361 0.0421 0.0478 5 ) Refer to par. 4.4. 6 ) Refer to par. 4.5. Sound rating Refer to par. 4.8. 1 ) See also Chapter 3. Grasso 2 ) The figures between brackets indicate the smaller oil charge for the RCA6W compressors due to the presence of an oil cooler. 3 ) Pw is needed for calculating the condenser capacity Qc. See also paragraph 4.6. Pw = (n/1000).(0.02293.z 2 - 0.08207.z + 0.71931). 4. GENERAL DATA 4 ) The mass moment of inertia Id, expressed in SI-units, is required to determine the so-called coefficient of speed fluctuation. 5 ) The centre of gravity and free forces and moments are of importance when calculating a vibration-free mounting of the compressor. 6 ) These crankshaft substitute systems are required to carry out torsional vibration calculations in case the compressor is driven by an internal combustion engine. v001.99.01.en Installation and Maintenance Manual RC(U)6 page C2.1
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