Danfoss MLM User Manual Download

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Selection &

application guidelines

REFRIGERATION &
AIR CONDITIONING DIVISION

MLZ / MLM Refrigeration scroll compressors

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

MAKING MODERN LIVING POSSIBLE

Summary of Contents for MLM

Page 1: ...Selection application guidelines REFRIGERATION AIR CONDITIONING DIVISION MLZ MLM Refrigeration scroll compressors 50 60 Hz R404A R507 R134a R22 MAKING MODERN LIVING POSSIBLE ...

Page 2: ...imum Continuous Current 15 Max Oper A Maximum Operating Amp 15 Winding resistance 16 Electrical connections 16 Nominal capacitor value and relays 17 Three phase 17 Internal motor protection 18 Phase sequence and reverse rotation protection 18 Voltage imbalance 18 APPROVALS AND CERTIFICATIONS 19 Approvals and certificates 19 Conformity to directives 19 Internal free volume 19 OPERATING CONDITIONS 2...

Page 3: ...ON 33 System cleanliness 33 Compressor handling and storage 33 Compressor mounting 33 Compressor holding charge 33 Tube brazing procedure 33 Brazing material 33 Vacuum evacuation and moisture removal 34 Liquid line filter driers 35 Refrigerant charging 35 Insulation resistance and dielectric strength 35 ORDERING INFORMATION AND PACKAGING 36 Packaging 36 Packaging details 36 SPARE PARTS ACCESSORIES...

Page 4: ...geration applications These compressors are engineered for refrigeration and offer cooling capacity from 15000 to 76000 Btu h at common voltages and frequencies as well as any of the common refri gerants R404A R134a R507 R22 Thanks to its dedicated refrigeration design the MLZ MLM scroll compressor delivers a number of powerful advantages With its high efficiency mo tor and optimised scroll design...

Page 5: ...th corresponding increase in gas pressure Maximum compression is achieved as the pocket reaches the discharge port at the centre Scroll compression is a continuous process when one pocket of gas is being compressed during the second orbit another gas quantity enters a new pocket formed at the periphery and simultane ously another is being discharged Danfoss scroll compressors are manufactured us i...

Page 6: ...ubricant Nominal capacity In thousand Btu h at 60 Hz ARI MBP conditions Model variation T design optimised for refrigeration Motor protection L internal motor protection Tubing and electrical connections P brazed connections spade terminals C brazed connections screw terminals Motor voltage code 1 208 230V 1 60 Hz 2 200 220V 3 50 Hz 208 230V 3 60 Hz 4 380 400V 3 50 Hz 460V 3 60 Hz 5 220 240V 1 50 ...

Page 7: ... 900 6 43 2 46 8 39 9 08 914 90 99 6 MLZ MLM076 10 18 100 61 800 7 43 2 44 8 32 9 91 998 90 99 6 60 Hz R404A MLZ015 2 MLZ019 2 5 700 19 500 2 81 2 03 6 93 2 66 323 36 68 MLZ021 3 6 100 20 800 2 98 2 05 6 99 2 82 343 36 68 MLZ026 3 7 600 25 800 3 75 2 02 6 88 3 49 424 36 68 MLZ030 4 8 900 30 300 4 25 2 09 7 13 4 20 510 53 82 MLZ038 5 10 700 36 500 5 13 2 09 7 12 4 94 600 53 82 MLZ045 6 12 900 44 10...

Page 8: ...9 85 13 000 7 34 MLZ030 17 300 9 74 19 500 10 91 22 900 12 74 18 900 9 99 15 700 7 45 MLZ038 20 400 9 40 23 000 10 52 27 000 12 25 22 300 9 62 18 400 7 18 MLZ045 25 300 10 19 28 600 11 44 33 700 13 38 27 600 10 44 22 800 7 72 MLZ048 26 800 10 01 30 300 11 20 35 600 13 05 29 300 10 24 24 200 7 59 MLZ058 32 000 9 56 36 000 10 63 42 100 12 27 34 800 9 73 28 800 7 30 MLZ066 37 100 9 75 41 800 10 86 48...

Page 9: ... 23 16 100 7 69 MLZ030 21 500 9 81 24 300 11 01 28 700 12 84 23 600 10 12 19 500 7 59 MLZ038 25 200 9 75 28 500 10 94 33 700 12 73 27 700 10 04 22 900 7 50 MLZ045 31 000 10 10 35 000 11 32 41 200 13 20 33 800 10 33 27 600 7 59 MLZ048 32 800 10 02 37 000 11 20 43 500 12 99 35 800 10 23 29 300 7 56 MLZ058 39 100 9 84 43 900 10 90 51 400 12 49 42 500 9 98 35 200 7 51 MLZ066 44 900 9 89 50 400 10 94 5...

Page 10: ...0 7 50 4 x Ø 0 75 4 32 9 40 7 50 73 45 31 34 4 38 5 06 6 45 Suction port 3 4 ODF Discharge port1 2 ODF 2 90 14 19 7 67 2 15 0 74 3 09 0 43 9 09 15 48 Schrader valve and cap Oil sight glass All dimensions in Inch Quick connect spade terminals P terminal box type 0 06 1 61 Ø 1 61 1 16 5 16 18 UNC self tapping Recommended torque for mounting bolts 100 lbf in 10 lbf in Ø 0 43 ...

Page 11: ... ODF 2 3 4 ODF 17 16 10 27 0 74 0 43 3 36 2 22 Schrader valve and cap Suction port 7 8 ODF 7 187 7 265 Oil sight glass 9 41 7 48 5 26 1 4 76 2 4 80 34 31 45 73 7 49 9 41 4 66 4 x Ø 0 75 1 MLZ MLM 030 038 045 2 MLZ MLM 048 All dimensions in Inch Quick connect spade terminals P terminal box type 0 06 1 61 Ø 1 61 1 16 5 16 18 UNC self tapping Recommended torque for mounting bolts 100 lbf in 10 lbf in...

Page 12: ...ge port 7 8 ODF 11 28 Schrader valve and cap Oil sight glass Suction port 1 1 8 ODF 1 91 0 74 0 27 0 28 13 79 1 20 34 2 20 72 3 63 3 70 1 19 29 2 19 66 1 MLZ M058 2 MLZ M066 076 All dimensions in Inch 34 31 45 73 7 491 7 509 9 13 4 x Ø 0 75 0 78 4 93 Quick connect spade terminals P terminal box type 0 06 1 61 Ø 1 61 1 16 5 16 18 UNC self tapping Recommended torque for mounting bolts 100 lbf in 10 ...

Page 13: ...aptors and adaptor sets are available as accessory Oil sight glass Schrader Suction and discharge connections DIMENSIONS Compressor models Brazed connection size Rotolock adaptor set cadaptor dgasket esleeve fnut Rotolock adaptor c 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 MLM 030...

Page 14: ... ensure that the two outside tabs of the cover engage the ter minal box The terminal cover and gasket should be installed prior to operation of the compressor Respect the up marking on gasket and cover and ensure that the two outside tabs of the cover engage the ter minal box The compressor terminal box IP rating according to CEI 529 is IP22 for all models First numeral level of protection against...

Page 15: ...ECTIONS AND WIRING Compressor model LRA MCC Max Oper A Winding resistance Ω A A A T1 T3 T1 T2 T2 T3 Motor voltage code 4 380 400 V 3ph 50 Hz 460 V 3 ph 60 Hz MLZ MLM015T4 MLZ MLM019T4 45 9 5 6 7 3 4 4 7 4 7 MLZ MLM021T4 45 9 5 6 8 3 4 4 7 4 7 MLZ MLM026T4 45 11 8 3 3 4 4 7 4 7 MLZ MLM030T4 60 13 9 8 2 6 2 6 2 6 MLZ MLM038T4 70 15 11 7 2 3 2 3 2 4 MLZ MLM045T4 82 15 14 1 1 9 1 9 1 8 MLZ MLM048T4 87...

Page 16: ...ol down close to ambient temperature Depending on the am bient conditions and the cooling of the PTC this may take about 5 minutes A restart before the PTC is back to low resistance may be successful or the motor may stall in a locked rotor state de pending on the ambient and system s conditions A locked rotor state causes the internal protector to open and would cause even further delay until the...

Page 17: ...ctor KM Phase monitor PM Safety lock out relay KS Pump down control low pressure switch LP High pressure safety switch HPs Fused disconnect Q1 Fuses F1 Compressor motor M Discharge gas thermostat DGT Compressor models Default solution PSC wiring with run capacitor only Additionnal components for CSR wiring PSC wiring CSR wiring Run capacitor Start capacitor Relay μF Volt μF Volt Reference 220 240 ...

Page 18: ...tors are required The selected phase moni tor should lock out the compressor from opera tion in reverse At brief power interruptions reverse rotation can occur with single phase compressors In this case the internal protector will stop the compressor It will have to cool down and will restart safely af terwards For three phase applications the voltage meas ured at the compressor terminals for each...

Page 19: ... system Other approvals certificates Contact Danfoss Products Internal free volume at LP side without oil in 3 MLZ MLM 015 026 114 MLZ MLM 030 048 114 MLZ MLM 058 076 375 Products MLZ MLM 015 to 076 Refrigerating fluids Group 2 Category PED I Evaluation module no scope Service temperature Ts 31 F Ts 131 F MLZ Service pressure Ps 369 PSI MLM Service pressure Ps 300 8 PSI Declaration of conformity c...

Page 20: ...n its liquid phase but for most other aspects this small glide can be ne glected Because of the small glide R404A is often called a near azeotropic mixture R507 is an HFC refrigerant with properties com parable to R404A R507 has no ozone depletion potential ODP 0 As with R404A R507 is par ticularly suitable for low evaporating temperature applications but it can also be used for medium evaporating...

Page 21: ...isk of liquid flood back Minimum and maximum evaporating and con densing temperatures as per the operating en velopes MLZ MLM compressors can be applied from 31 F to 122 F ambient temperature The com pressors are designed as 100 suction gas cooled without need for additional fan cooling Ambient temperature has very little effect on the compres sor performance In case of enclosed fitting and high a...

Page 22: ...Evaporating temperature F Condensing temperature F 0 10 20 30 40 50 60 70 60 70 80 90 100 110 120 130 140 150 160 170 SH 20 F 30 20 10 0 10 20 30 40 50 60 Evaporating temperature F Condensing temperature F MLZ MLM R22 50 60 70 80 90 100 110 120 130 140 150 160 SH 20 F RGT 77 F ...

Page 23: ...d be con trolled with an isolated thermocouple or thermo stat attached to the discharge line 6 inches from the compressor shell Maximum discharge gas temperature must not exceed 275 F when the compressor is running within the approved oper ating envelope Maximum discharge gas temperature Example 1 R22 SH 20 F LP switch setting LP1 29 PSI 5 F HP switch setting HP1 345 PSI 142 F c The LP and HP swit...

Page 24: ...r cycling R22 R404A R134a Working pressure range high side PSI 102 405 104 395 71 2 321 Working pressure range low side PSI 10 3 92 8 15 1 104 9 3 58 Maximum high pressure safety switch setting PSI 432 431 342 Minimum low pressure safety switch setting 1 PSI 7 4 11 6 6 5 Recommended pump down switch settings 7 3 PSI below nominal evaporating pressure Minimum low pressure pump down switch setting P...

Page 25: ... the compressor when stopped see fig 2 The maximum elevation difference between the in door and outdoor section cannot exceed 26 ft System manufacturers should specify precautions for any applications that exceed these limits to en sure compressor reliability Piping should be designed with adequate three dimensional flexibility figure 2 It should not be in contact with the surrounding structure un...

Page 26: ...table test to evaluate the risk of off cycle mi gration is the following Stabilize the non running system at 40 F ambi ent temperature Raise the ambient temperature to 70 F and keep it for 10 minutes Start the compressor and monitor sump tem perature sight glass indication and sound level The presence of liquid in the crankcase can be eas ily detected by checking the sump level through the oil sig...

Page 27: ...e stop Time should be carefully set to not interfere with the low safety pressure switch For low pressure pump down switch settings refer to page 24 For suggested wiring diagrams please see page 17 Models MLZ MLM015 048 incorporate an inter nal 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 pressu...

Page 28: ...oviding ad ditional internal free volume to the low side of the system A suction accumulator must be carefully dimen sioned taking into account the refrigerant charge as well as the gas velocity in the suction line De pending on the operating conditions it may hap pen that the recommended connections of the accumulator are one size smaller than the suction line Liquid ﬂood back During normal opera...

Page 29: ...st ing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures the use of a head pressure control valve is recommended Note This solution requires ex tra 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...

Page 30: ...n to the compressor When using a brazed plate condenser heat ex changer a sufficient free volume for the discharge gas to accumulate is required in order to avoid ex cess pressure build up At least 3 ft 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 ...

Page 31: ...ot generate the penetrating power of lower 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 out side Ensure that no components capable of trans mitting sound vibration within the unit come into direct contact with any non insulated parts on the walls of the unit Because of the unique de...

Page 32: ...residual vibration potentially transmitted to the frame The tubing should be designed so as to both reduce the transmission of vibrations to other structures and withstand vibra tion 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 con siderations p 25 Gas puls...

Page 33: ... and oil it was designed 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 sol der and flux have a negative impact on compres sor service life Many of these contaminants are small enough to pass through a mesh screen and c...

Page 34: ... absorb moisture from the air The compressor must therefore not be left open to the atmosphere for a long period of time The compressor fitting plugs shall be removed just before brazing the compressor Before eventual unbrazing the compressor or any system component the refrigerant charge must be removed from both the high and low pressure sides Failure to do so may re sult in serious personal inj...

Page 35: ...ontaining activated alumina is recommended After burn out remove replace the liquid line filter drier and install a Danfoss type DAS burnout drier of the appropriate capacity Refer to the DAS drier instructions and technical information for correct use of the burnout drier on the liquid line Insulation resistance and dielectric strength Insulation resistance must be higher than 1 mego hm when meas...

Page 36: ...ins following ac cessories 4 grommets per compressor 4 sleeves per compressor Packaging Single pack Packaging details US pallets Optimized for overseas container loading Danfoss pallets Optimized for overseas container loading Euro pean storage racks Code number 120U 121U Pack type Industrial pack Single pack Industrial pack Single pack Compressors per pallet 16 9 12 6 Static stacking of pallets 4...

Page 37: ...026 121U8059 121U8037 121U8003 121U8025 MLZ021 T P 9 121U8062 121U8040 121U8006 121U8028 121U8061 121U8039 121U8005 121U8027 MLZ026 T P 9 121U8064 121U8042 121U8008 121U8030 121U8063 121U8041 121U8007 121U8029 MLZ030 T C 9 121U8066 121U8044 121U8010 121U8032 121U8065 121U8043 121U8009 121U8031 MLZ038 T C 9 121U8068 121U8046 121U8012 121U8034 121U8067 121U8045 121U8011 121U8033 MLZ045 T C 9 121U804...

Page 38: ...1 1 4 7 8 MLZ 058 066 076 discharge Multipack 10 Type Code n Description Application Packaging Pack size 70 μF 120Z0051 PSC wiring Run Capacitor 70 μF motor voltage code 5 220 240V 1 50Hz MLZ015 019 021 026 Multipack 10 50 μF 8173233 PSC wiring Run Capacitor 50 μF motor voltage code 5 220 240V 1 50Hz MLZ030 Multipack 10 55 μF 8173234 PSC wiring Run Capacitor 55 μF motor voltage code 5 220 240V 1 5...

Page 39: ... Wire length 40 in MLZ MLM 030 038 045 048 058 066 076 Multipack 6 120Z0060 Belt type crankcase heater 65 W 400 V CE mark UL Wire length 40 in MLZ MLM 030 038 045 048 058 066 076 Multipack 6 Type Code No Description Application Packaging Pack Size 7750009 Discharge thermostat kit All models Multipack 10 7973008 Discharge thermostat kit All models Industry pack 50 Type Code No Description Applicati...

Page 40: ... http www danfoss us We are offering a single source for one of the widest ranges of innovative refrigeration and air conditioning components and systems in the world And we back technical solutions with business solution to help your company reduce costs streamline processes and achieve your business goals Danfoss A S www danfoss com Danfoss can accept no responsibility for possible errors in cat...

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