Danfoss Compressor DANFOSS SH-240 A4ABE

Application guidelines Danfoss scroll compressors SH090 to SH485 - single 50 Hz - 60 Hz - R410A http://cc.danfoss.com Application Guidelines Content Scroll compression principle. .................. 4 System design recommendations......... 27 General. ...................................................................... 27 Features..................................................... 5 Essential piping design recommendations. . 27 Compressor model designation.............. 6 Refrigerant charge limit. ...................................... 28 Nomenclature.............................................................6 Off-cycle migration................................................ 29 Liquid flood back.....................................................31 Technical specifications. .......................... 7 50-60 Hz data..............................................................7 Specific application recommendations.32 Low ambient application..................................... 32 Dimensions................................................ 8 Low load operation. .............................................. 33 SH090-105-120-140* and 161* . ............................8 Brazed plate heat exchangers. .......................... 33 SH 140 and 161 code 3 and SH184. .....................9 Electronic expansion valve. ................................ 33 SH180-240-295..........................................................10 Reversible heat pump systems. ........................ 33 SH380-485 (Except code 3)................................. 11 Water utilizing systems. ....................................... 35 SH380 code 3. ...........................................................12 Sound and vibration management....... 36 Electrical data, connections and wiring.13 Starting sound level. ............................................. 36 Connection details..................................................13 Running sound level. ............................................ 36 Motor voltage. ..........................................................14 Stopping sound level............................................ 36 Wiring connections. ...............................................14 IP rating. ......................................................................15 Installation. ............................................. 38 Terminal box temperature. ..................................15 Compressor handling and storage. ................. 38 Three phase electrical characteristics..............16 Compressor mounting. ........................................ 38 Danfoss MCI soft-start controller.......................17 Compressor holding charge............................... 39 General wiring information. ................................18 System cleanliness. ................................................ 40 Motor protection.................................................... 20 Tubing......................................................................... 40 Voltage imbalance. .................................................21 Brazing and soldering........................................... 40 System pressure test. .............................................41 Approval and certifications. .................. 22 Leak detection..........................................................42 Approvals and certificates................................... 22 Vacuum evacuation and moisture removal. .42 Pressure equipment directive 2014/68/EU. .. 22 Filter driers. ................................................................42 Low voltage directive 2014/35/EU. .................. 22 Refrigerant charging. ............................................ 43 Machines directive 2006/42/EC......................... 22 Insulation resistance and dielectric strength.43 Internal free volume.............................................. 22 Commissioning. ...................................................... 43 Oil level checking and top-up. .......................... 43 Operating conditions. ............................ 23 Refrigerant and lubricants. ................................. 23 Ordering information and packaging. . 44 Motor supply............................................................ 24 Packaging.................................................................. 44 Compressor ambient temperature.................. 24 Ordering information............................................ 45 Application envelope............................................ 24 Discharge temperature protection ................. 25 Accessories. ............................................. 47 High and low pressure protection. .................. 25 Cycle rate limit. ........................................................ 26 AB243586442172en-001401 3  Application Guidelines Scroll compression principle In a Danfoss SH scroll compressor, the compression is performed by two scroll elements located in the upper part of the compressor. Suction gas enters the compressor at the suction connection. As all of the gas flows around and through the electrical motor, thus ensuring complete motor cooling in all applications, oil droplets separate and fall into the oil sump. After exiting the electrical motor, the gas enters the scroll elements where compression takes place. Ultimately, the discharge gas leaves the compressor at the discharge connection. The figure below illustrates the entire compression process. The centre of the orbiting scroll (in grey) traces a circular path around the centre of the fixed scroll (in black). This movement creates symmetrical compression pockets between the two scroll elements. Low-pressure suction gas is trapped within each crescent-shaped pocket as it gets formed; continuous motion of the orbiting scroll serves to seal the pocket, which decreases in volume as the pocket moves towards the centre of the scroll set increasing the gas pressure. Maximum compression is achieved once a pocket reaches the centre where the discharge port is located; this stage occurs after three complete orbits. Compression is a continuous process: the scroll movement is suction, compression and discharge all at the same time. SUCTION COMPRESSION DISCHARGE 4 AB243586442172en-001401 Application Guidelines Features SH range is composed of SH090-105-120-140- • Gas intake design induces higher resistance to 161-184 (light commercial platform) and SH180- liquid slugging. 240-295-380-485 (large commercial platform). The SH485 compressors include additional The SH090-105-120-140-161-184 compressors features for enhanced protection and efficiency: benefit from a further improved design to • integrated discharge gas temperature achieve the highest efficiency. protection, • intermediate discharge valves for higher • Gas circulation, motor cooling and oil seasonal efficiency. behaviour are improved on…