Danfoss MLM Series User Manual Download

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Danfoss Scroll for Refrigeration

MLM / MLZ

50-60Hz - R404A - R507 - R134a - R22 - R407A - R407F

Application guidelines

http://cc.danfoss.com

Summary of Contents for MLM Series

Page 1: ...Danfoss Scroll for Refrigeration MLM MLZ 50 60Hz R404A R507 R134a R22 R407A R407F Application guidelines http cc danfoss com ...

Page 2: ......

Page 3: ...nt and lubricants 26 Motor supply 28 Compressor ambient temperature 28 Application envelope 28 Maximum discharge gas temperature 32 High and low pressure protection 33 On off cycling cycle rate limit 33 System design recommendations 34 General 34 Essential piping design considerations 34 Refrigerant charge limit 35 Off cycle migration 35 Liquid flood back 37 Specific application recommendations 38...

Page 4: ... of the common refrigerants R404A R134a R507 R22 R407A R407F Only motor code4 code5 of MLZ are qualified with R407A R407F MLZ are only qualified with the above 6 refrigerants MLM is to be used only with R22 Be sure you have selected a qualified refrigerant for this range of compressors Thanks to its dedicated refrigeration design the MLZ MLM scroll compressor delivers a number of powerful advantag...

Page 5: ...ates compression pockets between the two scroll elements Low pressure suction gas is trapped within each crescent shaped pocket as it forms 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 with corresponding increase in gas pressure Maximum compression is achieved as the pocket reaches the discharg...

Page 6: ...ion L internal motor protection Tubing and electrical connections P brazed connections spade terminals C brazed connections screw terminals T rotolock connections spade terminals Q rotolock connections screws terminals Motor voltage code 1 208 230V 1 60 Hz 2 200 220V 3 50 Hz 208 230V 3 60 Hz 4 380 415V 3 50 Hz 460V 3 60 Hz 5 220 240V 1 50 Hz 7 575V 3 60 Hz 9 380V 3 60 Hz Spade terminals Screw term...

Page 7: ...2 02 6 89 80 95 14 09 1 57 37 2 MLZ042 5 5 5300 18089 2 74 1 95 6 66 93 09 16 20 1 57 37 2 MLZ045 6 5800 19795 2 69 2 17 7 41 98 57 17 15 1 57 37 2 MLZ048 7 6200 21160 2 91 2 13 7 27 107 48 18 70 1 57 37 2 MLZ058 7 5 7400 25256 3 61 2 05 7 00 125 95 21 92 2 66 44 MLZ066 9 8600 29352 4 10 2 1 7 17 148 8 25 89 2 66 45 18 MLZ076 10 9600 32765 4 67 2 05 7 00 162 43 28 26 2 66 45 18 R22 MLZ MLM015 2 33...

Page 8: ... 51 1 96 6 69 162 43 28 26 2 66 45 18 R407F MLZ015 2 3300 11263 1 66 2 6 83 33 77 5 88 1 06 30 84 MLZ019 2 5 4300 14676 2 19 1 96 6 69 43 51 7 57 1 06 30 84 MLZ021 3 4500 15358 2 37 1 91 6 52 46 21 8 04 1 06 30 84 MLZ026 3 5 5700 19454 2 90 1 96 6 69 57 11 9 94 1 06 30 84 MLZ030 4 6900 23549 3 20 2 17 7 41 68 79 11 97 1 57 37 2 MLZ038 5 8000 27304 3 72 2 16 7 37 80 95 14 09 1 57 37 2 MLZ042 5 5 92...

Page 9: ... 10 80 95 17 00 1 57 37 2 MLZ042 5 5 6500 22184 3 33 1 94 6 62 93 09 19 55 1 57 37 2 MLZ045 6 7100 24232 3 32 2 13 7 27 98 57 20 70 1 57 37 2 MLZ048 7 7600 25939 3 54 2 13 7 27 107 48 22 57 1 57 37 2 MLZ058 7 5 9100 31058 4 28 2 12 7 24 125 95 26 45 2 66 44 MLZ066 9 10400 35495 4 85 2 15 7 34 148 8 31 25 2 66 45 18 MLZ076 10 11700 39932 5 61 2 09 7 13 162 43 34 11 2 66 45 18 R22 MLZ MLM015 2 3900 ...

Page 10: ... 09 7 13 162 43 34 11 2 66 45 18 R407F MLZ015 2 4100 13993 1 98 2 05 7 00 33 77 7 09 1 06 30 84 MLZ019 2 5 5300 18089 2 57 2 06 7 03 43 51 9 14 1 06 30 84 MLZ021 3 5700 19454 2 81 2 01 6 86 46 21 9 70 1 06 30 84 MLZ026 3 5 6900 23549 3 32 2 08 7 10 57 11 11 99 1 06 30 84 MLZ030 4 8500 29010 3 77 2 26 7 71 68 79 14 45 1 57 37 2 MLZ038 5 9800 33447 4 38 2 24 7 65 80 95 17 00 1 57 37 2 MLZ045 6 12000...

Page 11: ...08 19100 7 15 22900 7 23 27200 7 33 32300 7 43 38200 7 51 50 11000 8 70 13000 8 74 15400 8 80 18300 8 87 21800 8 94 25900 9 00 30800 9 04 60 Hz MLZ015T4 30 2800 1 50 3500 1 49 4300 1 49 5200 1 48 6200 1 46 7500 1 45 8900 1 42 10500 1 38 40 2300 1 87 2900 1 87 3600 1 87 4500 1 87 5400 1 86 6400 1 84 7600 1 81 9000 1 78 50 2300 2 34 3000 2 35 3700 2 35 4400 2 35 5300 2 33 6300 2 31 7500 2 27 MLZ019T...

Page 12: ...6 36 17400 6 33 21300 6 27 25600 6 22 30500 6 25 36100 6 42 50 19100 7 68 23100 7 64 27600 7 65 32600 7 78 60Hz MLZ MLM015T4 30 3000 1 22 3800 1 25 4600 1 29 5600 1 32 6700 1 36 7900 1 40 9300 1 45 40 3400 1 54 4200 1 58 5100 1 62 6100 1 65 7200 1 68 8500 1 70 50 4500 1 96 5500 2 00 6500 2 03 7700 2 04 MLZ MLM019T4 30 3900 1 56 4900 1 60 6000 1 65 7300 1 70 8800 1 74 10400 1 76 12200 1 76 40 4500 ...

Page 13: ...0 4 44 23500 4 45 28000 4 39 50 11600 5 26 14300 5 36 17400 5 42 21000 5 42 25000 5 34 60Hz MLZ015T4 30 3000 0 89 3700 0 90 4600 0 92 5500 0 94 6600 0 96 40 3400 1 10 4200 1 12 5100 1 14 6100 1 16 7200 1 18 50 3000 1 33 3700 1 36 4600 1 38 5500 1 40 6500 1 43 MLZ019T4 30 3800 1 15 4800 1 18 5900 1 20 7100 1 22 8500 1 25 40 4300 1 43 5400 1 46 6500 1 48 7800 1 50 9300 1 54 50 3900 1 73 4800 1 77 59...

Page 14: ...0200 6 87 36400 6 99 50 13400 8 48 16900 8 47 21100 8 49 25900 8 54 31500 8 62 60Hz MLZ015T4 30 2900 1 31 3700 1 32 4700 1 33 5800 1 33 7100 1 34 8600 1 35 10300 1 38 40 3200 1 64 4100 1 66 5100 1 67 6300 1 67 7600 1 68 9200 1 69 50 3500 2 07 4400 2 09 5400 2 11 6600 2 12 8000 2 12 MLZ019T4 30 3700 1 70 4800 1 71 6100 1 72 7500 1 72 9200 1 73 11200 1 75 13400 1 78 40 4200 2 12 5300 2 15 6600 2 16 ...

Page 15: ...00 7 32 38700 7 49 50 18200 9 07 22700 9 07 27800 9 11 33800 9 21 60Hz MLZ015T4 30 3100 1 40 3900 1 41 4900 1 41 6100 1 41 7500 1 42 9100 1 44 10900 1 50 40 4400 1 77 5400 1 78 6700 1 77 8100 1 78 9800 1 80 50 4700 2 24 5800 2 25 7100 2 25 8600 2 26 MLZ019T4 30 4000 1 82 5100 1 83 6400 1 82 8000 1 82 9800 1 83 11900 1 87 14300 1 94 40 5700 2 29 7100 2 30 8700 2 30 10600 2 30 12800 2 33 50 6100 2 9...

Page 16: ...1 360 195 55 19 79 11 231 393 Schrader valve and cap Oil sight glass All dimensions in mm P T terminal box type 1 7 41 Ø 41 29 5 5 16 18 UNC self tapping Recommended torque for mounting bolts 11 Nm 1 Nm Ø11 not supply with the grommet 239 4x Ø19 0 Ø163 5 165 5 Discharge line Ø1 00 14UN 2A Suction line Ø1 1 4 12UN 2A Oil sight glass Schrader valve and cap 129 110 72 1 75 1 360 393 231 11 19 79 55 1...

Page 17: ...239 118 4 x Ø 19 1 MLZ MLM 030 038 042 045 2 MLZ MLM 048 All dimensions in mm C Q terminal box type C T1 S T2 R T3 1 7 41 Ø 41 29 5 5 16 18 UNC self tapping Recommended torque for mounting bolts 11 Nm 1 Nm Ø11 not supply with the grommet Rotolock Brazed 239 121 2 suction line 95 25 134 120 3 92 0 94 0 403 2 202 4 261 Oil sight glass Schrader 435 9 19 11 34 31 45 2 239 190 190 4x Ø19 Ø182 54 184 54...

Page 18: ...99 1 MLZ M058 2 MLZ M066 076 All dimensions in mm 34 31 45 73 190 232 4 x Ø 19 125 C Q terminal box type C T1 S T2 R T3 1 7 41 Ø 41 29 5 5 16 18 UNC self tapping Recommended torque for mounting bolts 11 Nm 1 Nm Ø11 not supply with the grommet 232 232 124 9 suction line 133 31 73 45 2 119 27 4xØ19 Ø185 94 286 350 134 7 48 19 1 490 2 499 1 517 2 526 Suction line Ø1 3 4 12UN 2A Oil sight glass Schrad...

Page 19: ...re connector incorporating a schrader valve Torque requirements Schrader valve core 0 6 0 2 Nm Schrader valve cover 14 5 1Nm Schrader Compressor models Brazed connection size Rotolock adaptor set adaptor gasket sleeve nut Rotolock adaptor adaptor only Rotolock Solder sleeve ODF Code Number Code Number MLZ MLM 015 019 021 026 Suction 3 4 1 1 4 3 4 120Z0126 120Z0366 Discharge 1 2 1 1 2 120Z0365 MLZ ...

Page 20: ... be taken during installation to ensure that the compressor operates in the correct direction see Phase sequence and reverse rotation protection The drawings below show electrical terminal labelling and should be used as a reference when wiring the compressor For three phase applications the terminals are labelled T1 T2 and T3 For single phase applications the terminals are labelled C common S sta...

Page 21: ...5 4 5 4 7 3 7 3 MLZ MLM021T7 38 8 0 5 5 5 4 7 3 7 3 MLZ MLM026T7 38 9 0 6 0 5 4 7 3 7 3 MLZ MLM030T7 42 9 0 7 8 4 4 4 5 4 4 MLZ MLM038T7 53 11 5 9 4 4 0 3 9 4 0 MLZ MLM045T7 64 11 5 11 3 2 8 2 9 2 9 MLZ MLM048T7 67 14 12 3 2 6 2 6 2 5 MLZ MLM058T7 75 16 14 4 2 3 2 3 2 3 MLZ MLM066T7 95 17 16 3 2 0 2 0 2 0 MLZ MLM076T7 100 20 19 1 1 7 1 7 1 7 Motor voltage code 9 380 V 3ph 60 Hz MLZ MLM015T9 40 7 5...

Page 22: ...thod and measure under stabilised ambient temperature Winding resistance varies strongly with winding temperature If the compressor is stabilised at a different value than 25 C the measured resistance must be corrected with following formula a tamb Rtamb R25 C a t25 C t25 C reference temperature 25 C tamb temperature during measurement C R25 C winding resistance at 25 C Ramb winding resistance at ...

Page 23: ...til the overload is reset The following PTC types are recommended for the MLZ MLM single phase compressors CSR wiring Nominal capacitor value and relays Model Voltage code 1 208 230 V 1 60 Hz Voltage code 5 220 240 V 1 50 Hz MLZ MLM015 305C12 305C9 305C11 MLZ MLM019 305C9 305C11 305C9 305C11 MLZ MLM021 305C9 305C11 305C9 305C11 MLZ MLM026 305C12 305C9 305C11 MLZ MLM030 305C9 305C11 305C9 305C11 ML...

Page 24: ...rwards For three phase applications the voltage measured at the compressor terminals for each phase should be within 2 of the average for all phases Phase sequence and reverse rotation protection Voltage imbalance Internal motor protection MLZ MLM scroll compressors are equipped with an internal line break protector mounted on the motor windings The protector is an automatic reset device containin...

Page 25: ...r approvals certificates Contact Danfoss Products Internal free volume at LP side without oil litre MLZ MLM 015 026 1 85 MLZ MLM 030 048 1 85 MLZ MLM 058 076 6 15 Products MLZ MLM 015 to 076 Refrigerating fluids Group 2 Category PED I Evaluation module no scope Service temperature Ts 35 C Ts 55 c MLZ Service pressure Ps 25 44 bar g MLM Service pressure Ps 20 74 bar g Declaration of conformity cont...

Page 26: ...vaporating temperature applications but it can also be applied to medium evaporating temperature applications R404A is a mixture and has a very small temperature glide and therefore must be charged in its liquid phase but for most other aspects this small glide can be neglected Because of the small glide R404A is often called a near azeotropic mixture R507 is an HFC refrigerant with properties com...

Page 27: ...The composition of vapour and liquid changes during the phase transition The composition change causes phase shift and temperature glide In system components where both vapour and liquid phases are present evaporator condenser liquid receiver the liquid phase and vapour phase do not have the same composition In fact both phases form two different refrigerants Therefore zeotropic refrigerants need ...

Page 28: ...flood back Minimum and maximum evaporating and condensing temperatures as per the operating envelopes MLZ MLM compressors can be applied from 35 C to 55 C ambient temperature The compressors are designed as 100 suction gas cooled without need for additional fan cooling Ambient temperature has very little effect on the compressor performance In case of enclosed fitting and high ambient temperature ...

Page 29: ... 15 10 5 0 5 10 15 20 Evaporating temperature C Condensing temperature C SH 11K RGT 25 C SH 11K MLZ MLM R22 10 15 20 25 30 35 40 45 50 55 60 65 70 75 35 30 25 20 15 10 5 0 5 10 15 20 Evaporating temperature C Condensing temperature C 29 FRCC PC 015 A8 02 Application Guidelines ...

Page 30: ...5 50 55 60 65 30 25 20 15 10 5 0 5 10 15 Evaporating temperature C Condensing temperature C SH 10K RGT 20 C MLZ076 R407A 5 10 15 20 25 30 35 40 45 50 55 60 65 30 25 20 15 10 5 0 5 10 15 Evaporating temperature C Condensing temperature C 30 FRCC PC 015 A8 02 Application Guidelines ...

Page 31: ...5 50 55 60 65 30 25 20 15 10 5 0 5 10 15 Evaporating temperature C Condensing temperature C SH 10K RGT 20 C MLZ076 R407F 5 10 15 20 25 30 35 40 45 50 55 60 65 30 25 20 15 10 5 0 5 10 15 Evaporating temperature C Condensing temperature C 31 FRCC PC 015 A8 02 Application Guidelines ...

Page 32: ...th an isolated thermocouple or thermostat attached to the discharge line 15 cm 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 135 C 275 F when the compressor is running within the approved operating envelope Maximum discharge gas temperature R22 SH 11K MLZ MLM 10 15 20 25 30 35 40 45 50 55 60 65 70 75 35 30 25 20 15 10 5 0 5 10 15 20 Evaporating temperature C ...

Page 33: ...9 7 20 27 7 4 91 22 1 6 0 25 6 6 3 23 9 Working pressure range low side bar g 0 71 6 4 1 04 7 2 0 64 4 0 0 9 6 0 1 1 6 3 Maximum high pressure safety switch setting bar g 29 8 29 7 23 6 26 8 25 1 Minimum low pressure safety switch setting bar g 0 51 0 8 0 45 0 7 0 9 Recommended pump down switch settings 1 5 bar below nominal evaporating pressure Minimum low pressure pump down switch setting bar g ...

Page 34: ... when stopped see fig 2 The maximum elevation difference between the indoor and outdoor section cannot exceed 8 m System manufacturers should specify precautions for any applications that exceed these limits to ensure compressor reliability Piping should be designed with adequate three dimensional flexibility figure 2 It should not be in contact with the surrounding structure unless a proper tubin...

Page 35: ...evaluate the risk of off cycle migration is the following Stabilize the non running system at 5 C ambient temperature Raise the ambient temperature to 20 C and keep it for 10 minutes Start the compressor and monitor sump temperature sight glass indication and sound level The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass Foam in th...

Page 36: ... low leak check valve that is appropriate for pump down operations This valve prevents the back flow of refrigerant from the high pressure to the low pressure side through the compressor so pump down conditions can be achieved and maintained Models MLZ MLM058 076 are not equipped with this low leak check valve Under certain conditions the internal valve may not completely seal and due to the refri...

Page 37: ...y measuring either the oil sump temperature or the discharge gas temperature If at any time during operations the oil sump temperature drops to within 10K or less above the saturated suction temperature or should the discharge gas temperature be less than 35K above the saturated discharge temperature this indicates liquid flood back Continuous liquid flood back can occur with a wrong dimensioning ...

Page 38: ...cedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires extra refrigerant charge which can introduce other problems A non return valve in the discharge line is recommended and special care should be taken when designing the discharge line For further information please contact Danfoss Low ambient sta...

Page 39: ... using a brazed plate condenser heat exchanger a sufficient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build up At least 1 meter of discharge line is necessary to generate this volume To help reduce the discharge gas volume immediately after start up the supply of cooling water to the heat exchanger may be opened before the compressor starts to re...

Page 40: ...frequency sound Use of sound insulation materials on the inside of unit panels is an effective means of substantially reducing the sound being transmitted to the outside Ensure that no components capable of transmitting sound vibration within the unit come into direct contact with any non insulated parts on the walls of the unit Because of the unique design of a full suction gas oil cooled motor c...

Page 41: ...otentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibration without incurring any damage Tubing should also be designed for three dimensional flexibility For more information on piping design please see the section entitled Essential piping design considerations Gas pulsation The MLZ MLM scroll co...

Page 42: ...esigned for Any other substances within the system will not improve performance and in most cases will be highly detrimental to system operations The presence of non condensable substances and system contaminants such as metal shavings solder and flux have a negative impact on compressor service life Many of these contaminants are small enough to pass through a mesh screen and can cause considerab...

Page 43: ...into the compressor Remove all remaining flux once the joint has been soldered with a wire brush or a wet cloth Remaining flux would cause corrosion of the tubing Ensure that no flux is allowed to enter into the tubing or compressor Flux is acidic and can cause substantial damage to the internal parts of the system and compressor The PVE oil used in MLZ compressors is highly hygroscopic and will r...

Page 44: ... Important selection criteria include the driers water content capacity the system refrigeration capacity and the system refrigerant charge The drier must be able to reach and maintain a moisture level of 50 ppm end point dryness EPD Danfoss recommends DCL solid core driers for the MLM compressor R22 with Alkylbenzene and DML 100 molecular sieve driers for MLZ compressors R407A R407F R404A R507 R1...

Page 45: ...4 grommets per compressor 4 sleeves per compressor Packaging Single pack Packaging details Danfoss pallets Optimized for overseas container loading European storage racks US pallets Optimized for overseas container loading Code number 121U 120U Pack type Industrial pack Single pack Industrial pack Single pack Compressors per pallet 12 6 16 16 Static stacking of pallets 4 4 4 4 Shipped accessories ...

Page 46: ...8068 120U8046 120U8012 120U8034 120U8296 MLZ042 T C 9 120U8399 MLZ045 T C 9 120U8048 120U8014 120U8332 120U8302 MLZ048 T C 9 120U8050 120U8016 120U8338 120U8308 MLZ058 T C 9 120U8052 120U8018 120U8344 120U8314 MLZ066 T C 9 120U8054 120U8020 120U8350 MLZ076 T C 9 120U8056 120U8022 120U8356 Brazed version Rotolock version Compressors Model variation Connections Features Voltage code 1 Voltage code 2...

Page 47: ...0U8067 120U8045 120U8011 120U8033 120U8295 MLZ042 T C 9 120U8398 MLZ045 T C 9 120U8047 120U8013 120U8331 120U8301 MLZ048 T C 9 120U8049 120U8015 120U8337 120U8307 MLZ058 T C 9 120U8051 120U8017 120U8343 120U8313 MLZ066 T C 9 120U8053 120U8019 120U8349 MLZ076 T C 9 120U8055 120U8021 120U8355 Brazed version Rotolock version Compressors Model variation Connections Features Voltage code 1 Voltage code...

Page 48: ...M019 021 26 60HZ Motor Code 1 MLZ MLM030 Multipack 10 60 μF 120Z0050 PSC wiring Run Capacitor 60 μF 60HZ Motor Code 1 MLZ MLM026 Multipack 10 55 μF 8173234 PSC wiring Run Capacitor 55 μF 50Hz Motor Code 5 MLZ MLM038 042 60HZ Motor Code 1 MLZ MLM038 Multipack 10 50 μF 8173233 PSC wiring Run Capacitor 50 μF 50Hz Motor Code 5 MLZ MLM030 Multipack 10 45 μF 8173232 PSC wiring Run Capacitor 45 μF 60HZ M...

Page 49: ... 7968006 Rotolock valve V04 1 1 4 Rotolock 3 4 ODF Suction MLM Z015 026 Discharge MLM Z048 Industry pack 42 8168029 Rotolock valve V04 1 1 4 Rotolock 3 4 ODF Multipack 6 7968007 Rotolock valve V05 1 1 4 Rotolock 7 8 ODF Suction MLM Z030 048 Discharge MLM Z058 076 Industry pack 36 8168030 Rotolock valve V05 1 1 4 Rotolock 7 8 ODF Multipack 6 7968009 Rotolock valve V02 1 3 4 Rotolock 1 1 8 ODF Sucti...

Page 50: ...k 6 Acoustic hood Terminal box Manifolding service kit Code No Description Application Packaging Pack Size 120Z5083 Acoustic hood MLZ MLM015 019 021 026 Single pack 1 120Z5084 Acoustic hood MLZ MLM030 038 042 045 048 Single pack 1 120Z5085 Acoustic hood MLZ MLM058 066 076 Single pack 1 Code No Description Application Packaging Pack Size 120Z5015 Round terminal box P T version MLZ MLM015 019 021 02...

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Page 52: ...ioned us as distinct variable speed technology specialists Today we operate from engineering and manufacturing facilities spread across three continents FRCC PC 015 A8 02 Danfoss DCS CC 2016 12 Our products can be found in a variety of applications such as rooftops chillers residential air conditioners heatpumps coldrooms supermarkets milk tank cooling and industrial cooling processes http cc danf...

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