Danfoss MLZ Instruction Manual

Selection &
application guidelines
REFRIGERATION &
AIR CONDITIONING DIVISION
MLZ / MLM Refrigeration scroll compressors
50 - 60 Hz - R404A - R507 - R134a - R22
MAKING MODERN LIVING POSSIBLE

APPLICATION GUIDELINES CONTENTS
FEATURES................................................................................................................................4
SCROLL COMPRESSION PRINCIPLE...................................................................................................5
The scroll compression process.................................................................................................................................. 5
COMPRESSOR MODEL DESIGNATION................................................................................................6
Nomenclature ................................................................................................................................................................... 6
Label..................................................................................................................................................................................... 6
Serial number.................................................................................................................................................................... 6
TECHNICAL SPECIFICATIONS..........................................................................................................7
TECHNICAL SPECIFICATIONS..........................................................................................................8
50 Hz..................................................................................................................................................................................... 8
60 Hz..................................................................................................................................................................................... 9
DIMENSIONS ..........................................................................................................................10
MLZ/MLM015-019-021-026 .......................................................................................................................................10
MLZ/MLM030-038-045-048 .......................................................................................................................................11
MLZ/MLM058-066-076 ................................................................................................................................................12
Oil sight glass ..................................................................................................................................................................13
Schrader ............................................................................................................................................................................13
Suction and discharge connections .......................................................................................................................13
ELECTRICAL DATA, CONNECTIONS AND WIRING ................................................................................14
Motor voltage .................................................................................................................................................................14
Wiring connections.......................................................................................................................................................14
IP rating .............................................................................................................................................................................14
Three phase electrical characteristics.....................................................................................................................15
Single phase electrical characteristics ...................................................................................................................15
LRA (Locked Rotor Amp).............................................................................................................................................15
MCC (Maximum 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 ...........................................................................................................20
Refrigerant and lubricants..........................................................................................................................................20
Motor supply...................................................................................................................................................................21
Compressor ambient temperature..........................................................................................................................21
Application envelope...................................................................................................................................................21
Maximum discharge gas temperature...................................................................................................................23
OPERATING CONDITIONS ...........................................................................................................24
High and low pressure protection...........................................................................................................................24
On/off cycling (cycle rate limit).................................................................................................................................24
SYSTEM DESIGN RECOMMENDATIONS ............................................................................................25
General ..............................................................................................................................................................................25
Essential piping design considerations .................................................................................................................25
Refrigerant charge limit ..............................................................................................................................................26
Off-cycle migration .......................................................................................................................................................26
Liquid flood back ...........................................................................................................................................................28
2 FRCC.PC.016.A1.22

APPLICATION GUIDELINES CONTENTS
SPECIFIC APPLICATION RECOMMENDATIONS ....................................................................................29
Low ambient application............................................................................................................................................29
Scroll and reciprocating ..............................................................................................................................................29
Low load operations.....................................................................................................................................................30
Brazed plate heat exchangers...................................................................................................................................30
Water utilising systems................................................................................................................................................30
SOUND AND VIBRATION MANAGEMENT..........................................................................................31
Starting sound level......................................................................................................................................................31
Running sound level.....................................................................................................................................................31
Stopping sound level ...................................................................................................................................................31
Sound generation in a refrigeration system ........................................................................................................31
Compressor sound radiation.....................................................................................................................................31
Mechanical vibrations..................................................................................................................................................32
Gas pulsation...................................................................................................................................................................32
INSTALLATION ........................................................................................................................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.....................................................................................................38
Run capacitors for PSC wiring ...................................................................................................................................38
Start capacitors and starting relay for CSR wiring .............................................................................................38
Rotolock adaptor set ....................................................................................................................................................38
Rotolock adaptor ...........................................................................................................................................................38
Crankcase heater............................................................................................................................................................39
Discharge temperature protection .........................................................................................................................39
Lubricant...........................................................................................................................................................................39
Mounting hardware......................................................................................................................................................39
3FRCC.PC.016.A1.22

APPLICATION GUIDELINES FEATURES
With its unique scroll design and manufacturing
process flexibility, the new Danfoss MLZ/MLM re-
frigeration compressor offers a highly efficient so-
lution for demanding refrigeration applications.
This new family of refrigeration compressors in-
cludes 11 sizes of medium temperature scroll com-
pressors designed for commercial refrigeration
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 it reduces energy
cost in normal operating conditions and delivers
high capacity and an optimised pressure ratio for
refrigeration applications.
4 FRCC.PC.016.A1.22

APPLICATION GUIDELINES
The scroll compression
process
SCROLL COMPRESSION PRINCIPLE
The entire scroll compression process is illustrated
below. The centre of the orbiting scroll traces a
circular path around the centre of the fixed scroll.
This movement creates compression pockets be-
tween 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 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-
ing the most advanced machining, assembly, and
process control techniques. In design of both the
compressor and the factory, very high standards
of reliability and process control were first prior-
ity. The result is a highly efficient product with the
highest reliability obtainable, and a low sound
level.
5FRCC.PC.016.A1.22
SUCTION
COMPRESSION
DISCHARGE

APPLICATION GUIDELINES
Label
Serial number
COMPRESSOR MODEL DESIGNATION
Nomenclature
6 FRCC.PC.016.A1.22
S K 1234509
03
Production year
Production week
Manufacturing location Incremental number
Type FeaturesMotorSize
M LZ P 9T 4 L
021
Application
M: medium temperature refrigeration
Family, Refrigerant & lubricant
LZ: R404A - R507 - R134a - R22, PVE lubricant
LM: R22, alkylbenzene lubricant
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 Hz
7: 500V/3~/50 Hz & 575V/ 3~/60 Hz
9: 380V/3~/60 Hz
Other features
Oil sight
glass
Oil equali-
sation
Oil
drain
LP gauge
port
Gas equalisa-
tion port
9
None Schrader None None
Threaded

APPLICATION GUIDELINES TECHNICAL SPECIFICATIONS
Model Ton
Nominal cooling capac-
ity *
Power
input*
Efficiency * Swept
volume
Displace-
ment Oil charge Net weight (with oil)
COP EER
W Btu/h kW W/W Btu/h/W in3/rev cfh fl. oz. lbs
50 Hz
R404A**
MLZ015 2
MLZ019 2 ½ 4 600 15 800 2.34 1.98 6.75 2.66 267 36 68
MLZ021 3 4 900 16 800 2.49 1.98 6.75 2.82 284 36 68
MLZ026 3 ½ 6 100 21 000 3.08 2.00 6.82 3.49 351 36 68
MLZ030 4 7 400 25 200 3.63 2.03 6.94 4.20 423 53 82
MLZ038 5 8 800 30 100 4.33 2.03 6.94 4.94 497 53 82
MLZ045 6 10 600 36 200 5.00 2.12 7.24 6.02 606 53 82
MLZ048 7 11 600 39 400 5.50 2.10 7.17 6.56 660 53 82
MLZ058 7 ½ 13 400 45 700 6.76 1.98 6.75 7.69 774 90 97
MLZ066 9 15 900 54 100 7.54 2.10 7.17 9.08 914 90 99.6
MLZ076 10 17 700 60 300 8.64 2.04 6.98 9.91 998 90 99.6
R134a
MLZ015 2
MLZ019 2 ½ 2 900 9 900 1.40 2.07 7.07 2.66 267 36 68
MLZ021 3 3 100 10 500 1.45 2.13 7.26 2.82 284 36 68
MLZ026 3 ½ 3 800 13 000 1.77 2.15 7.34 3.49 351 36 68
MLZ030 4 4 600 15 700 2.11 2.18 7.45 4.20 423 53 82
MLZ038 5 5 400 18 400 2.56 2.10 7.18 4.94 497 53 82
MLZ045 6 6 700 22 800 2.95 2.26 7.72 6.02 606 53 82
MLZ048 7 7 100 24 200 3.18 2.23 7.59 6.56 660 53 82
MLZ058 7 ½ 8 400 28 800 3.95 2.14 7.30 7.69 774 90 97
MLZ066 9 9 800 33 500 4.49 2.18 7.45 9.08 914 90 99.6
MLZ076 10 10 900 37 300 5.11 2.14 7.30 9.91 998 90 99.6
R22
MLZ/MLM015 2
MLZ/MLM019 2 ½ 4 600 15 600 2.03 2.26 7.71 2.66 267 36 68
MLZ/MLM021 3 4 900 16 700 2.23 2.19 7.48 2.82 284 36 68
MLZ/MLM026 3 ½ 6 200 21 300 2.62 2.38 8.13 3.49 351 36 68
MLZ/MLM030 4 7 200 24 700 3.20 2.27 7.74 4.20 423 53 82
MLZ/MLM038 5 8 500 29 100 3.79 2.25 7.67 4.94 497 53 82
MLZ/MLM045 6 10 700 36 400 4.50 2.37 8.09 6.02 606 53 82
MLZ/MLM048 7 11 600 39 500 4.92 2.36 8.04 6.56 660 53 82
MLZ/MLM058 7 ½ 13 200 45 100 5.78 2.29 7.81 7.69 774 90 97
MLZ/MLM066 9 15 800 53 900 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 ½ 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 ½ 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 44 100 6.16 2.10 7.17 6.02 731 53 82
MLZ048 7 14 100 48 200 6.71 2.11 7.19 6.56 797 53 82
MLZ058 7 ½ 16 300 55 600 8.01 2.03 6.94 7.69 934 90 97
MLZ066 9 19 200 65 500 9.14 2.10 7.17 9.08 1104 90 99.6
MLZ076 10 21 700 73 900 10.43 2.08 7.09 9.91 1205 90 99.6
R134a
MLZ015 2
MLZ019 2 ½ 3 600 12 300 1.68 2.14 7.31 2.66 323 36 68
MLZ021 3 3 800 13 100 1.74 2.21 7.54 2.82 343 36 68
MLZ026 3 ½ 4 700 16 100 2.10 2.25 7.69 3.49 424 36 68
MLZ030 4 5 700 19 500 2.57 2.22 7.59 4.20 510 53 82
MLZ038 5 6 700 22 900 3.05 2.20 7.50 4.94 600 53 82
MLZ045 6 8 100 27 600 3.64 2.22 7.59 6.02 731 53 82
MLZ048 7 8 600 29 300 3.88 2.22 7.56 6.56 797 53 82
MLZ058 7 ½ 10 300 35 200 4.69 2.20 7.51 7.69 934 90 97
MLZ066 9 11 800 40 400 5.34 2.22 7.57 9.08 1104 90 99.6
MLZ076 10 13 300 45 500 6.16 2.16 7.38 9.91 1205 90 99.6
R22
MLZ/MLM015 2
MLZ/MLM019 2 ½ 5 700 19 500 2.68 2.13 7.28 2.66 323 36 68
MLZ/MLM021 3 6 100 21 000 2.59 2.37 8.08 2.82 343 36 68
MLZ/MLM026 3 ½ 7 800 26 600 3.27 2.38 8.12 3.49 424 36 68
MLZ/MLM030 4 9 000 30 800 3.80 2.37 8.10 4.20 510 53 82
MLZ/MLM038 5 10 600 36 200 4.48 2.37 8.10 4.94 600 53 82
MLZ/MLM045 6 12 900 44 100 5.34 2.42 8.26 6.02 731 53 82
MLZ/MLM048 7 14 100 48 300 5.88 2.41 8.21 6.56 797 53 82
MLZ/MLM058 7 ½ 16 400 55 900 7.04 2.33 7.95 7.69 934 90 97
MLZ/MLM066 9 19 200 65 600 7.92 2.42 8.28 9.08 1104 90 99.6
MLZ/MLM076 10 22 400 76 300 9.27 2.41 8.23 9.91 1205 90 99.6
* at ARI conditions: SST = 20°F, SDT = 120°F, RGT = 65°F, SC = 0°F. Presented data are for motor voltage code 4, 400V/3ph/50Hz & 460V/3ph/60Hz
** R507 performance data are nearly identical to R404A performance data
7FRCC.PC.016.A1.22

APPLICATION GUIDELINES TECHNICAL SPECIFICATIONS
50 Hz
Models
SST = 20 °, SDT = 105 °F
RGT = 65 °F, SC = 0 °F
Cold room
SST = 25 °F, SDT = 105 °F
RGT = 65 °F, SC = 0 °F
Ice machine
SST = 32 °F, SDT = 105 °F
RGT = 65 °F, SC = 0 °F
Air drier
SST = 25 °F, SDT = 110 °F
RGT = 65 °F, SC = 0 °F
Milk tank
SST = 20 °F, SDT = 120 °F
RGT = 65 °F, SC = 0 °F
ARI MT conditions
Capacity EER Capacity EER Capacity EER Capacity EER Capacity EER
(Btu/h) (Btu/h/W) (Btu/h) (Btu/h/W) (Btu/h) (Btu/h/W) (Btu/h) (Btu/hr/W) (Btu/h) (Btu/h/W)
R404A *
MLZ015
MLZ019 18 400 9.49 20 300 10.52 23 300 12.12 19 400 9.42 15 800 6.75
MLZ021 19 500 9.51 21 600 10.51 24 700 12.07 20 600 9.42 16 800 6.75
MLZ026 24 400 9.60 27 000 10.63 30 900 12.21 25 800 9.53 21 000 6.82
MLZ030 29 400 9.74 32 500 10.78 37 300 12.37 31 000 9.67 25 200 6.94
MLZ038 35 100 9.71 38 800 10.71 44 400 12.25 37 000 9.61 30 100 6.94
MLZ045 42 200 10.17 46 700 11.23 53 400 12.86 44 500 10.08 36 200 7.24
MLZ048 46 000 10.09 50 800 11.16 58 200 12.82 48 400 10.00 39 400 7.17
MLZ058 54 800 9.76 60 900 10.86 70 200 12.47 57 700 9.69 45 700 6.75
MLZ066 62 800 9.92 69 300 10.90 79 300 12.35 66 200 9.84 54 100 7.17
MLZ076 72 400 9.94 79 900 10.89 91 500 12.35 75 600 9.74 60 300 6.98
R134a
MLZ015
MLZ019 10 900 9.22 12 300 10.32 14 500 12.05 12 000 9.46 9 900 7.07
MLZ021 11 600 9.46 13 100 10.59 15 400 12.35 12 700 9.71 10 500 7.26
MLZ026 14 400 9.61 16 200 10.76 19 100 12.55 15 700 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 48 900 12.57 40 400 9.94 33 500 7.45
MLZ076 41 400 9.56 46 600 10.65 54 600 12.32 45 100 9.74 37 300 7.30
R22
MLZ/MLM015
MLZ/MLM019 17 300 10.11 19 200 11.20 22 200 12.77 18 600 10.24 15 600 7.71
MLZ/MLM021 18 400 9.91 20 400 10.99 23 500 12.54 19 800 10.06 16 700 7.48
MLZ/MLM026 23 400 10.90 25 900 12.03 29 800 13.70 25 100 10.94 21 300 8.13
MLZ/MLM030 27 500 10.25 30 500 11.49 35 100 13.13 29 600 10.49 24 700 7.74
MLZ/MLM038 32 100 10.15 35 700 11.34 41 200 12.96 34 600 10.36 29 100 7.67
MLZ/MLM045 40 000 10.70 44 200 11.70 50 900 13.38 42 900 10.68 36 400 8.09
MLZ/MLM048 43 200 10.59 48 100 11.67 55 600 13.39 46 800 10.68 39 500 8.04
MLZ/MLM058 50 200 10.54 56 300 11.81 65 700 13.66 54 600 10.77 45 100 7.81
MLZ/MLM066 58 800 10.93 65 700 12.13 76 000 13.85 63 900 11.14 53 900 8.39
MLZ/MLM076 68 000 11.11 75 500 12.23 87 100 13.95 73 400 11.19 61 800 8.32
EER = Energy Efficiency Ratio
All performance data are for motor voltage code 4, 400 V / 3ph / 50 Hz
* R507 performance data are nearly identical to R404A performance data
Capacity data at other conditions are available in the datasheets at: www.danfoss.com/odsg
8 FRCC.PC.016.A1.22

APPLICATION GUIDELINES TECHNICAL SPECIFICATIONS
60 Hz
Models
SST = 20 °, SDT = 105 °F
RGT = 65 °F, SC = 0 °F
Cold room
SST = 25 °F, SDT = 105 °F
RGT = 65 °F, SC = 0 °F
Ice machine
SST = 32 °F, SDT = 105 °F
RGT = 65 °F, SC = 0 °F
Air drier
SST = 25 °F, SDT = 110 °F
RGT = 65 °F, SC = 0 °F
Milk tank
SST = 20 °F, SDT = 120 °F
RGT = 65 °F, SC = 0 °F
ARI MT conditions
Capacity EER Capacity EER Capacity EER Capacity EER Capacity EER
(Btu/h) (Btu/h/W) (Btu/h) (Btu/h/W) (Btu/h) (Btu/h/W) (Btu/h) (Btu/hr/W) (Btu/h) (Btu/h/W)
R404A *
MLZ015
MLZ019 22 600 9.68 24 900 10.71 28 500 12.29 23 800 9.60 19 500 6.93
MLZ021 24 100 9.72 26 600 10.76 30 400 12.33 25 400 9.68 20 800 6.99
MLZ026 29 900 9.58 33 000 10.58 37 800 12.12 31 600 9.51 25 800 6.88
MLZ030 35 200 9.89 38 900 10.88 44 400 12.41 37 100 9.81 30 300 7.13
MLZ038 42 200 9.84 46 500 10.82 53 100 12.33 44 500 9.74 36 500 7.12
MLZ045 51 100 10.01 56 400 11.05 64 500 12.62 53 900 9.92 44 100 7.17
MLZ048 56 000 9.96 61 800 10.96 70 600 12.51 59 000 9.87 48 200 7.19
MLZ058 66 600 9.83 73 900 10.80 84 900 12.26 69 900 9.70 55 600 6.94
MLZ066 75 900 9.71 83 800 10.61 95 900 11.96 80 000 9.63 65 500 7.17
MLZ076 86 600 9.76 95 600 10.68 109 400 12.05 91 000 9.65 73 900 7.09
R134a
MLZ015
MLZ019 13 600 9.45 15 400 10.59 18 100 12.32 14 900 9.73 12 300 7.31
MLZ021 14 500 9.74 16 400 10.91 19 300 12.71 15 900 10.03 13 100 7.54
MLZ026 17 800 9.96 20 200 11.14 23 800 12.94 19 600 10.23 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 59 000 12.53 48 900 10.02 40 400 7.57
MLZ076 50 400 9.68 56 600 10.72 66 200 12.29 54 900 9.82 45 500 7.38
R22
MLZ/MLM015
MLZ/MLM019 21 300 9.31 23 700 10.37 27 400 11.93 23 100 9.57 19 500 7.28
MLZ/MLM021 23 100 10.33 25 500 11.63 29 400 13.35 24 800 10.72 21 000 8.08
MLZ/MLM026 28 900 10.75 31 700 11.76 36 200 13.25 31 000 10.75 26 600 8.12
MLZ/MLM030 33 600 10.44 37 500 11.54 43 300 13.13 36 400 10.62 30 800 8.10
MLZ/MLM038 39 900 10.52 44 300 11.52 51 000 13.06 43 000 10.59 36 200 8.10
MLZ/MLM045 48 700 10.85 54 200 11.96 62 500 13.61 52 700 10.96 44 100 8.26
MLZ/MLM048 53 300 10.79 59 200 11.92 68 300 13.60 57 500 10.92 48 300 8.21
MLZ/MLM058 62 100 10.46 69 100 11.58 80 000 13.29 67 000 10.63 55 900 7.95
MLZ/MLM066 71 500 10.59 79 500 11.68 91 700 13.34 77 400 10.78 65 600 8.28
MLZ/MLM076 83 600 10.70 92 500 11.83 106 200 13.46 89 900 10.87 76 300 8.23
EER = Energy Efficiency Ratio
All performance data are for motor voltage code 4, 460 V / 3 ph / 60 Hz
* R507 performance data are nearly identical to R404A performance data
Capacity data at other conditions are available in the datasheets at: www.danfoss.com/odsg
9FRCC.PC.016.A1.22

APPLICATION GUIDELINES
MLZ/MLM015-019-021-026
DIMENSIONS
Mounting grommetTerminal box
Refer to page 36 for overview of shipped mounting accessories
10 FRCC.PC.016.A1.22
9.40
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

APPLICATION GUIDELINES
MLZ/MLM030-038-045-048
DIMENSIONS
Mounting grommetTerminal box
Refer to page 36 for overview of shipped mounting accessories
11FRCC.PC.016.A1.22
3.70
15.85
7.9
Discharge port
1) 1/2” 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)
Ø 0.43

APPLICATION GUIDELINES
MLZ/MLM058-066-076
DIMENSIONS
Mounting grommetTerminal box
Refer to page 36 for overview of shipped mounting accessories
12 FRCC.PC.016.A1.22
9.13
7.491 - 7.509
5.24
4.84
7.211 - 7.288
Discharge
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 lbf.in)
Ø 0.43

APPLICATION GUIDELINES
MLZ / MLM scroll compressors come equipped
with a threaded oil sight glass with 1”1/8 - 18 UNF
connection. It can be used for a visual check of the
oil amount and condition or it may be replaced by
an accessory oil management device. The oil level
must be visible in the sight glass during opera-
tion.
The oil fill and drain connection and gauge port
is a 1/4” male flare connector incorporating a
schrader valve.
MLZ / MLM scroll compressors are factory deliv-
ered with brazed connections only. Dedicated
rotolock adaptors 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
(cadaptor 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 030-038-045
Suction 7/8" 1-1/4" 7/8"
120Z0127
120Z0367
Discharge 1/2" 1" 1/2" 120Z0365
MLZ/MLM 048
Suction 7/8" 1-1/4" 7/8"
120Z0128
120Z0367
Discharge 3/4" 1-1/4" 3/4" 120Z0366
MLZ/MLM 058-066-076
Suction 1-1/8" 1-3/4" 1-1/8"
120Z0129
120Z0364
Discharge 7/8" 1-1/4" 7/8" 120Z0367
13FRCC.PC.016.A1.22
Oil sight glass
Schrader valve
and cap
cde f
c

APPLICATION GUIDELINES
MLZ/MLM scroll compressors are available in 3 different motor voltages.
MLZ/MLM scroll compressors will only compress
gas while rotating counter-clockwise (when
viewed from the compressor top). Since single-
phase motors will start and run in only one direc-
tion, reverse rotation is not a major consideration.
Three-phase motors, however, will start and run in
either direction, depending on the phase angles
of the supplied power. Care must be taken during
installation to ensure that the compressor oper-
ates in the correct direction (see “Phase sequence
and reverse rotation protection” page 18).
The drawings below show electrical terminal la-
belling and should be used as a reference when
wiring the compressor. For three phase applica-
tions, the terminals are labelled T1, T2, and T3.
For single-phase applications the terminals are
labelled C (common), S (start), and R (run).
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 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 contact and foreign objects•
2protection against object size over 1/2 inch (fingers of similar)
Second numeral, level of protection against water•
2protection against dripping water when tilted up to 15°
Motor voltage
Wiring connections
Terminal cover mounting
Terminal cover removal
IP rating
ELECTRICAL DATA, CONNECTIONS AND WIRING
Motor voltage code 1 Motor voltage code 2 Motor voltage code 4 Motor voltage code 5
50 Hz
Nominal voltage - 200-220 V / 3 ph / 50 Hz 380-400 V / 3 ph / 50 Hz 220-240 V / 1 ph / 50Hz
Voltage range - 180 - 242 V 340 - 460 V 198 - 264 V
60 Hz
Nominal voltage 208-230 V / 1 ph / 60 Hz 208-230 V / 3 ph / 60 Hz 460 V / 3 ph / 60 Hz -
Voltage range 187 - 253 V 187 - 253 V 414 - 506 V -
14 FRCC.PC.016.A1.22
Ring connect screw terminals
C terminal box type
C
T₁
S
T₂
R
T₃
Quick connect spade terminals
P terminal box type
push
push
push

APPLICATION GUIDELINES
LRA is the higher average current as measured on
a mechanically blocked compressor tested under
nominal voltage. LRA is printed on the name-
plate.
The LRA value can be used as a rough estimation
for the starting current. However in most cases,
the real starting current will be lower. Many coun-
tries have defined limits for the starting current in
domestic use. A soft starter can be applied to re-
duce starting current.
The MCC is the current at which the internal mo-
tor protection trips under maximum load and low
voltage conditions.
This MCC value is the maximum at which the com-
pressor can be operated in transient conditions
and out of the application envelope. Above this
value the overload will switch off to protect the
motor.
The Max Oper. A is the current when the compres-
sor operates at maximum load conditions and
10% below nominal voltage.
This value which is the max rated load current for
the compressor is new on the nameplate.
Max Oper. A can be used to select cables and con-
tactors.
In normal operation, the compressor current
consumption is always less than the Max Oper. A
value.
Three phase electrical
characteristics
Single phase electrical
characteristics
LRA (Locked Rotor Amp)
MCC (Maximum Continu-
ous Current)
Max Oper. A (Maximum
Operating Amp)
ELECTRICAL DATA, CONNECTIONS 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 16 15.3 1.7 1.7 1.7
MLZ/MLM058T4 95 20 18.1 1.4 1.4 1.4
MLZ/MLM066T4 110 24 20.3 1.3 1.3 1.3
MLZ/MLM076T4 140 25 23.9 1.1 1.1 1.1
Motor voltage code 2
200-220 V / 3 ph / 50 Hz 208-230 V / 3 ph / 60 Hz
MLZ019T2 95 17.5 13.3 0.87 1.18 1.18
MLZ021T2 95 17.5 13.6 0.87 1.18 1.18
MLZ026T2 95 22.0 16.6 0.87 1.18 1.18
MLZ030T2 120 26.0 19.7 0.67 0.67 0.68
MLZ038T2 123 26.0 23.5 0.60 0.60 0.61
MLZ045T2 170 30.0 28.2 0.48 0.46 0.48
MLZ048T2 190 37.0 30.6 0.43 0.44 0.43
MLZ058T2 190 40.0 36.1 0.37 0.37 0.37
MLZ066T2 235 46.0 40.7 0.32 0.32 0.33
MLZ076T2 235 50.0 47.6 0.32 0.32 0.33
Compressor model LRA MCC Max. Oper. A Winding resistance (Ω)
A A A run start
Motor code 5
220-240 V /
1 ph / 50 Hz
MLZ/MLM 015T5
MLZ/MLM 019T5 97 23.0 18.3 0.69 1.51
MLZ/MLM 021T5 97 25.0 19.5 0.69 1.51
MLZ/MLM 026T5 97 27.0 24.2 0.69 1.51
MLZ/MLM 030T5 127 32.0 28.9 0.42 1.31
MLZ/MLM 038T5 130 42.0 33.9 0.39 1.02
Motor code 1
208-230 V /
1 ph / 60 Hz
MLZ019T1 97 25.0 19.9 0.67 1.57
MLZ021T1 97 24.5 21.4 0.67 1.57
MLZ026T1 115 31.5 26.8 0.55 1.47
MLZ030T1 150 38.0 31.9 0.34 0.90
MLZ038T1 160 45.0 37.2 0.28 1.76
15FRCC.PC.016.A1.22

APPLICATION GUIDELINES ELECTRICAL DATA, CONNECTIONS AND WIRING
MLZ / MLM single phase scroll compressors are
designed to operate without any assistance. If
starting within the defined voltage range, PSC
wiring is sufficient.
PSC wiring with a run capacitor only is the default
wiring solution for single phase MLZ and MLM
compressors.
The start winding (C-S) of the motor remains in
circuit through a permanent (run) capacitor. This
permanent (run) capacitor is connected between
the start winding (S) and the run winding (R).
If the starting torque of the PSC wiring is not suf-
ficient due to pressures not fully equalized during
the off-cycle or some voltage drop during start-
ing, the PTCSCR wiring might be an option. PTC-
SRC wiring provides more motor torque than PSC
wiring but less than CSR wiring. The PTC is wired in
parallel to the run capacitor.
When starting the compressor, the PTC, which is at
low resistance, provides additional starting current
to the motor’s start winding. The current passing
through the PTC causes it to heat up and, at a cer-
tain temperature, change to a very high resistance.
At this time the motor is up to nominal speed and
the run capacitor determines the current through
the start winding. The PTC remains at high tem-
perature and thus at high resistance as long as
power is connected to the compressor. When the
compressor is switched off, the PTC cools down to
its initial low resistance and becomes available to
support the next compressor start.
It is important to provide sufficient time between
motor starts to allow the PTC to cool 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 overload is reset.
The following PTC types are recommended for the
MLZ/MLM single phase compressors:
Electrical connections
PSC wiring
PTCSCR wiring
Winding resistance Winding resistance is the resistance between in-
dicated terminal pins at 77°F (resistance value
± 7%).
Winding resistance is generally low and it requires
adapted tools for precise measurement. Use a dig-
ital ohm-meter, a ‘4 wires’ method and measure
under stabilised ambient temperature. Winding
resistance varies strongly with winding tempera-
ture ; If the compressor is stabilised at a different
value than 77°F, the measured resistance must be
corrected with following formula:
a + tamb
Rtamb = R77°F
a + t77°F
t77°F: reference temperature = 77°F
tamb: temperature during measurement (°F)
R77°F: winding resistance at 77°F
Ramb: winding resistance at tamb
coefficient a= 390
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*
MLZ/MLM038 305C9* / 305C11* 305C9* / 305C11*
Note: MLZ compressors with PTCSCR are not approved by UL. It is the customers’responsibility to get final approval for the system
when required.
16 FRCC.PC.016.A1.22
NL₁
Run capacitor
PTC
Thermostat
C
SR
IOL
NL₁
Run capacitor
Thermostat
C
SR
IOL

APPLICATION GUIDELINES ELECTRICAL DATA, CONNECTIONS AND WIRING
CSR wiring provides additional motor torque at
start-up, by the use of a start capacitor in combi-
nation with the run capacitor. The start capacitor
is only connected during the starting operation,
a potential relay is used to disconnect it after the
start sequence.
Some applications with high differential pressure
and start duty as "soft serve ice cream machine"
can require CSR wiring. This configuration can also
be used to reduce erratic starting at unfavourable
conditions such as very low ambient temperature
or weak voltage.
CSR wiring
Nominal capacitor value
and relays
Three phase
Suggested wiring diagram with
"one shot" pump down cycle
and safety lock-out relay
Control device.................................................. TH
Optional short cycle timer (3 min) .........180 s
Control relay .................................................... KA
Liquid Line Solenoid valve.........................LLSV
Compressor contactor.................................. 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 V /1/50 Hz
Motor voltage code 5
MLZ/MLM015-019-021-026 70 370 145-175 330 3ARR3J3AL4 RVA9CKL
MLZ/MLM030 50 370 161-193 250 3ARR3J24AP4 RVA3EKL
MLZ/MLM038-045-048 55 440 88-108 330 3ARR3J25AS4 RVA4GKL
208-230 V / 1 / 60 Hz
Motor voltage code 1
MLZ/MLM019-021 45 370 145-175 250 3AAR3*3M*
MLZ/MLM026 60 370 88-108 330 3ARR3*3L*
MLZ/MLM030-033 60 370 161-193 250 3ARR3*3L*
MLZ/MLM038 55 440 88-108 250 3ARR3*25S*
17FRCC.PC.016.A1.22
M
DGT
HPs
180 s
TH
LP
CONTROL CIRCUIT
F1F1
KM
KM
KM
KA KA
A1
A2
A3
KA
KA
KS
KS
KS
L1 L3 L2
Q1
T1
T3
T2
LLSV KS
Wiring diagram with pump-down cycle
PM
N L₁
Thermostat
Start capacitor
Start Relay
5
2
1
15 kΩ -1 w
C
SR
Run capacitor

APPLICATION GUIDELINES ELECTRICAL DATA, CONNECTIONS AND WIRING
The compressor will only operate properly in a
single direction. Use a phase meter to establish
the phase orders and connect line phases L1, L2
and L3 to terminals T1, T2 and T3, respectively.
For three-phase compressors, the motor will run
equally well in both directions. Reverse rotation
results in excessive noise; no pressure differential
between suction and discharge; and suction line
warming rather than immediate cooling. A service
technician should be present at initial start-up to
verify that supply power is properly phased and
that compressor and auxiliaries are rotating in the
correct direction.
MLZ/MLM015-038 scroll compressors are de-
signed to operate for a maximum of 150 hours in
reverse, but as a reverse rotation situation can go
unnoticed for longer periods, phase monitors are
recommended.
For compressors MLZ/MLM048 and larger, phase
monitors 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 phase
should be within ± 2% of the average for all phas-
es.
Phase sequence and re-
verse 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, containing a snap action bimetal
switch.
Internal protectors respond to over-current and
overheating. They are designed to interrupt motor
current under a variety of fault conditions, such as
failure to start, running overload, and fan failure.
If the internal overload protector trips out, it must
cool down to about 140°F to reset. Depending on
ambient temperature, this may take up to several
hours.
18 FRCC.PC.016.A1.22

APPLICATION GUIDELINES APPROVALS AND CERTIFICATIONS
MLZ scroll compressors comply with the following
approvals and certificates.
Certificates are listed on the product datasheets:
http://www.danfoss.com/odsg
Approvals and certificates
Conformity to directives
Internal free volume
CE 0062 or CE 0038
(European Directive) All MLZ models
UL
(Underwriters Laboratories)
Models with motor code 1, 2 & 4 except when using
PTCSCR 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 contact Danfoss
Marking of conformity CE
Pressure equipment directive 97/23/EC
Machinery directive 98/35/EC annex II b
Low voltage directive 2006 / 95 EC
Electromagnetic compatibility 2004/108/CE
19FRCC.PC.016.A1.22

APPLICATION GUIDELINES OPERATING CONDITIONS
The scroll compressor application range is influ-
enced by several parameters which need to be
monitored for a safe and reliable operation.
These parameters and the main recommenda-
tions for good practice and safety devices are ex-
plained hereunder.
Refrigerant and lubricants•
Motor supply•
Compressor ambient temperature•
Application envelope• (evaporating tempera-
ture, condensing temperature, return gas tem-
perature)
General information
Refrigerant and lubricants
When choosing a refrigerant, different aspects
must be taken into consideration:
• Legislation (now and in the future)
• Safety
• Application envelope in relation to expected
running conditions
• Compressor capacity and efficiency
• Compressor manufacturer recommendations &
guidelines
Additional points could influence the final choice:
• Environmental considerations
• Standardisation of refrigerants and lubricants
• Refrigerant cost
• Refrigerant availability
R22 R22 is an HCFC refrigerant and is still a wide use to-
day. It has a low ODP (Ozone Depletion Potential)
and therefore it will be phased out in the future.
Check local legislation.
When R22 is applied in refrigeration applications it
can lead to high discharge temperature. Carefully
check all other parameters that can influence the
discharge temperature.
R404A
R507
Alkylbenzene oil
PVE
R404A is an HFC refrigerant. R404A has zero ozone
depletion potential (ODP = 0). R404A is especially
suitable for low evaporating temperature applica-
tions but it can also be applied to medium evapo-
rating temperature applications. R404A is a mix-
ture 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 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 temperature applications. R507 is an
azeotropic mixture with no temperature glide.
Polyvinyl ether (PVE) is an innovative refrigeration
lubricant for HFC refrigerant systems. PVE is as hy-
groscopic as existing polyolester lubricants (POE),
but PVE doesn’t chemically react with water; no
acids are formed and compressor evacuation is
easier.
The compressor technology applied in MLZ com-
pressors in combination with PVE lubricant pro-
vides the best possible result in terms of reliability
and compressor lifetime.
The PVE lubricant is compatible with R22 which
makes the MLZ compressors a very versatile multi-
refrigerant solution.
Alkylbenzene oil can be applied in systems using
HCFC refrigerants (R22). Compared to a mineral oil
it provides distinct advantages: excellent miscibil-
ity, excellent thermal stability, compatibility with
mineral oils and constant quality.
MLM series compressors are charged with Alkyl-
benzene oil and herewith offer an economically
interesting alternative to the MLZ series in regions
where R22 is still the predominant refrigerant.
Note however that MLM compressors can not be
used with HFC refrigerants.
Refrigerant R134a is an HFC refrigerant. R134a has
zero ozone depletion potential (ODP = 0) and is
commonly accepted as the best R12 alternative.
R134a is a pure refrigerant and has zero tempera-
ture glide. For applications with high evaporating
and high condensing temperatures, R134a is the
ideal choice.
R134a
20 FRCC.PC.016.A1.22