DWM Copeland Technical Information - Copeland Compressor

1 1/27 Technical InformationDate of last update:01-08 .01/0806-0108/EApplication Engineering EuropeDDWWMMCCOOPPEELLAANNDDSSEEMMII--HH EERRMMEETTIICCCCOOMMPPRREESSSSOORRSSCCAA PPAACCIITTYYCCOONNTTRROOLL1 CompressorCapacity Modulation for Air Conditioning & Refrigeration ControlCompressors in the higher capacity range need some formof capacity control to accommodate varyingrefrigeration capacity control kit supplied by DWM Copeland will reduce the refrigeration capacity alongwith a similarproportionalreduction in Power ensures optimum performance even in part control is also required when the condensingpressure falls witha dropin ambientair Compressor suction condition.

2 Refrigerant volumeand massflowra tewillremainunchanged. The capacitywillincrease due to the increase in h, along with theincrease involumetric efficiency,see of Capacity ControlThere are many methods of capacity control for Semi-Hermetic compressors but DWM Copeland use the BlockedSuctionmethod and for the D3 DOverRe-expansionmethod known : Oil circulation in systems with capacity control is morecriticalAdvantagesDisadvantagesReduc es the starting frequency of the compressorsMotor is less cooled (refrigerant flow reduced)Ensure satisfactory operation with optimal capacity dataRestriction of the application rangeEnergy cost savingeven at partial-loadOil circulation is more criticalAdditional Capacityatlower cond.

3 PressureCompressor Capacityat design conditionPressurekJ/kgP hhSame Compressor inlet .01 /0806-0108/E2/27 Technical Information2 DWM Copeland Semi-HermeticS Series Models Capacity ControlFor4S, 6S and 8S cylinder compressors a mechanical capacity control is aware thatcapacity controlledoperation changes the application range of the ControlThe4S, 6S & 8 Scompressors have an internal capacity control, they work on the principle of blocking the suctiongas passage to two or more cylinders. They require the use of a special cylinder head and a control valve withsolenoid coil. These items may be ordered installed at the factory or in a kit form for later suction port of the valve plate will be closed by a control piston (blocked suction).

4 To prevent transport damagethe solenoid valve is suppliedloose and thecylinder head is fitted with a shipping plate, therefore the shipping platewith gasket must be removed and the solenoid valve with new gasket mounted. Do not put the Compressor intooperation with the shipping plate this could result in erratic operation of the control piston and inadequate Capacity ControlThesecompressorscan be ordered with inactive capacity control. There is a gasket under the shipping plate thatallows operation on 100% capacity. To convert to active capacity control all that is needed is to fit the solenoidvalve with the active gasket instead of the shipping Operation (Full load)When the solenoid coil is not energised the top of the unloader piston is vented to suction pressure allowing thepiston to be lifted by means of a spring.

5 The Compressor draws gas from all cylinders and reaches full Controlled Operation (Part load)When the solenoid coil is energised the top of the unloader piston is forced down with discharge gas pressurethereby blocking the suction gas passage into the cylinders thus enabling the Compressor to run with of Capacity ControlD4S50%ActiveInactiveInternal snorkel valve located hereGasket- Cylinder headforcapacity control Internal view External .01 /0806-0108/E3/27 Technical InformationD6SD6R, D6SK& D6 SUD8 SCapacity control must be fitted in the following positions:D4S50%terminal box sideD6SK 1st step33%terminal box sideD6SK 2nd step66%lower cylinder head on discharge valve sideD6S 1st step33%terminal box sideD6S 2nd step66%upper cylinder headD8S 1st step25%lower cylinder head on terminal box sideD8S 2nd step50%lower cylinder head on dischargevalve sideRetrofit Kit includes:Voltages of the solenoid valve coil.

6 1 x Cylinder head for capacity control24V x Gasket kit24V / 1~ / 50 / 60 Hz1 x Solenoid valve assembly (No 703 RB 001)208-240V / 1~ / 50 / 60 Hz2 x Mounting screws120V / 1~ / 50 / 60 HzProtection class: IP 55 (evaluation according to IEC 34)Selection of Capacity ControlD4S - D8SR 22 CompressorNumber of Cylinderswith Capacity ControlRemainingRefrigeration Capacity% (average values)RemainingPower Input% (average values)Diagram NoH / MH / MD4SA-20002100%50%5153D4SH-25002100%50%5 153D4SJ-30002100%50%5153D6SA-30002 / 4100%66%33%67/3468/34D6SH-35002 / 4100%66%33%67/3468/34D6SJ-40002 / 4100%66%33%67/3468/34D8SH-50002 / 4100%75%50%76/5379/57D8SJ-60002 / 4100%75%50%76/5379/57D8SK-70002 / 4100%75%50%76/5379/572 BApplication limit.

7 See data sheets and application diagramsH = high temperatureM = medium temperature2AD_T_SHC_029 Capacity RegulatingStepApplication Range101266 %66 %33%33%25%50% 310 310 610 295 Optional50% .01 /0806-0108/E4/27 Technical Range / H / J & D6SA /H / JDiagram 1 Suction gas temperature 25 / JDiagram 2 ASuction gas temperature 25 CCondensing[OC]Evaporating CCondensing[OC]Evaporating .01 /0806-0108/E5/27 Technical 7000 Diagram 2 BSuction gas temperature 25 of Capacity ControlD4S - D8SR 407C (mid-point)CompressorNumber of Cylinderswith Capacity ControlRemainingRefrigeration Capacity% (average values)RemainingPower Input% (average values)Diagram NoH / MH / MD4SA-200X2100%50%5153D4SH-250X2100%50%5 153D4SJ-300X2100%50%5153D6SA-300X2 / 4100%66%33%67/3468/34D6SH-350X2 / 4100%66%33%67/3468/34D6SJ-400X2 / 4100%66%33%67/3468/34D8SH-500X2 / 4100%75%50%76/5379/574D8SJ-600X2 / 4100%75%50%76/5379/57D8SK-700X2 / 4100%75%50%76/5379/575 Application limit.

8 See data sheets and application diagramsH = high temperatureM = medium temperatureD_T_SHC_0303 Capacity RegulatingStep012 Application RangeCondensing[OC]Evaporating .01 /0806-0108/E6/27 Technical Range R407C / H / J & D6SA / H / JDiagram 3 Suction gas temperature 25 / JDiagram 4 Suction gas temperature 25 CCondensing[OC]Evaporating CEvaporating CCondensing[OC] .01 /0806-0108/E7/27 Technical 5 Suction gas temperature 25 of Capacity ControlD4S - D8SR 404 ACompressorNumber of Cylinderswith Capacity ControlDiagram NoHMLHMLD4SF-100X2100%50%5259D4SL-150X21 00%50%5259D4ST-200X2100%50%5259D4SA-200X 2100%50%51525359D4SH-250X2100%50%5152535 9D4SJ-300X2100%50%51525359D6SF-200X2 / 4100%66%33%68/3470/41D6SL-250X2 / 4100%66%33%68/3470/41D6ST-320X2 / 4100%66%33%68/3470/41D6SU-400X2 / 4100%66%33%68/3470/41D6SA-300X2 / 4100%66%33%67/3468/3468/3670/41D6SH-350X 2 / 4100%66%33%67/3468/3468/3670/41D6SJ-400X 2 / 4100%66%33%67/3468/3468/3670/41D8SH-370X 2 / 4100%75%50%76/5376/5379/5680/58D8SJ-450X 2 / 4100%75%50%76/5376/5379/5680/58D8SH-500X 2 /

9 4100%75%50%76/5376/5379/5680/58D8SJ-600X 2 / 4100%75%50%76/5376/5379/5680/58 Application limit: see data sheets and application diagramsH = high temperatureM = medium temperatureL = low temperature6 & 701D_T_SHC_031 Capacity RegulatingStepsRemainingRefrigeration Capacity% (average values)RemainingPower Input% (average values)8 & 96 & 78 & 92 Application RangeCondensing[OC]Evaporating .01 /0806-0108/E8/27 Technical Range- / L / T & D6SF / L / T / UDiagram 6: Suction gas temperature 25 CLow Temperature WITH Additional Cooling (Fan)Diagram7: Suction gas temperature 25 CLow Temperature WITHOUT Additional Cooling (Fan)Condensing[OC]Evaporating CCondensing[OC]Evaporating.

10 01 /0806-0108/E9/27 Technical / H / J & D6SA / H / J & D8SH / JDiagram 8: Suction gas temperature 25 CMedium Temperature WITHA dditional Cooling (Fan)Diagram 9 Suction gas temperature 25 CMedium Temperature WITHOUT Additional Cooling (Fan)Condensing[OC]Evaporating CCondensing[OC]Evaporating .01 /0806-0108/E10 /27 Technical Information3 DWM Copeland Semi-Hermetic Discus Models Capacity ControlAll Discus model compressors can be equipped with capacity control. When the Compressor is oper at ed usingca pacity control the appli ca tion range prevent transport damage the sole noid valves are supplied loose with the Compressor , and the cylin der head isfit ted with a shipping plate.