Danfoss LLZ013 Application guide

Download

Application guidelines

Danfoss scroll for refrigeration

LLZ013 to 034 with NI/VI/LI

Low temperature

50-60 Hz - R404A, R507

http://cc.danfoss.com

Content

GENERAL INFORMATION ........................ 4

PRODUCT INFORMATION ....................... 5

Features..................................................... 5

Overview ......................................................................5

Compressor model designation ............. 6

Nomenclature ............................................................6

Technical specications ........................... 7

50-60 Hz data .............................................................7

Dimensions ............................................. 10

Single compressors LLZ013-015-018 ...............10

Single compressors LLZ024 .................................11

Single compressors LLZ034 ...............................12

Electrical data, connections and wiring 14

Motor voltage ...........................................................14

Wiring connections ................................................ 14

IP rating .......................................................................15

Three phase electrical characteristics ............. 15

Motor protection.....................................................16

Approval and certicates ...................... 17

Pressure equipment directive ............................17

Low voltage directive ............................................ 17

Machines directive .................................................17

Internal free volume...............................................17

SYSTEM DESIGN ..................................... 18

Design piping ......................................... 18

General requirements ...........................................18

Design compressor mounting .............. 19

General requirements ...........................................19

Single compressor requirements ......................19

Manage sound and vibration ................ 20

Compressor sound radiation ............................. 20

Mechanical vibrations ...........................................21

Gas pulsation ............................................................21

Manage operating envelope ................. 22

Requirement ............................................................ 22

Evaluate the risk ...................................................... 24

Theory of Injection cycle ....................... 25

Theory of Vapor injection cycle ........................ 25

Theory of liquid injection cycle ........................ 25

TREV installation ..................................................... 26

Manage superheat ................................. 28

Requirement ............................................................ 28

Evaluate the risk ...................................................... 28

Test, criteria and solutions .................................. 28

Manage o cycle migration ................... 29

Requirement ............................................................ 29

Evaluate the risk ...................................................... 29

Test, criteria and solutions .................................. 29

Control logic ...........................................30

Safety control logic requirements ................... 30

Cycle rate limit requirements ............................ 30

Oil management logic recommendations ... 30

Defrost logic recommendations ...................... 30

Pump-down logic recommendations .............31

Provide power supply and electrical

protection ............................................... 32

Wiring information ................................................ 32

INTEGRATION INTO SYSTEMS ..............33

Reduce moisture in the system ............. 33

Requirements .......................................................... 33

Solutions ................................................................... 33

Assembly line procedure ....................... 34

Compressor storage .............................................. 34

Compressor holding charge .............................. 34

Handling ................................................................... 34

Piping assembly...................................................... 35

System pressure test and leak detection ...... 35

Vacuum evacuation and moisture removal 36

Refrigerant charging ............................................. 36

Dielectric strength and insulation resistance

tests ............................................................................. 36

Commissioning ....................................... 37

Preliminary check....................................................37

Initial start-up ...........................................................37

System monitoring .................................................37

Dismantle and disposal ......................... 38

ORDERING INFORMATION ................... 39

Packaging ............................................... 39

Ordering codes ....................................... 40

Accessories .............................................. 41

3FRCC.PC.039.A1.02

General Information

PRODUCT INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION GENERAL INFORMATION

Danfoss scroll compressors are designed and manufactured according to the state of the art and to valid European and US regulations. Particular emphasis has been placed on safety and reliability. Related instructions are highlighted with the following icons:

This icon indicates instructions to avoid reliability risk.

This icon indicates instructions to avoid safety risk.

You are strongly advised to follow these instructions. For any deviation from the guidelines, please contact Danfoss Technical Support.

In any case, Danfoss accepts no liability as a result of the improper integration of the compressor into the unit by the system manufacturer.

4 FRCC.PC.039.A1.02

Features

Overview Economized compressor: In the LLZ range of

Danfoss scroll compressor for refrigeration, LLZ, with its unique scroll design and manufacturing process exibility, oers a highly ecient solution for demanding refrigeration applications.

This new family of refrigeration scroll compressors includes 5 sizes of low temperature scroll compressors designed for commercial refrigeration applications. These compressors are engineered for refrigeration and oer cooling capacity from 5 to 12 kW (4 to 10 HP) at common voltages and frequencies as well as any of the common refrigerants (R404A / R507).

refrigeration scrolls, the compressors can work with the economizer line activated, named as economized compressor; or with the economizer line disabled, named as standard compressor. The economized compressor has been developed to provide improved performance and an enlarged operating envelope in refrigeration applications. The economized compressor system presents benets over standard refrigeration compressor systems of equivalent horse power due to the following:

• Capacity improvement: The capacity is improved without increasing compressor displacement, as it is increased by further increasing system sub cooling with a heat exchanger acting as an economizer (connected to the compressor economizer line). Furthermore a smaller economized compressor can be used to achieve the same capacity as a larger standard compressor, leading to cost advantages.

• Eciency improvement: With a suitable sized heat exchanger, the eciency improves due to the fact that the gain in capacity is greater than the increase in power that the compressor consumes.

GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION

• Enlarged operating envelope: The injection of vapour through the economizer line will reduce the discharge temperature and therefore enlarge the operating envelope based on the same suction status.

Standard compressor with liquid injection: The standard compressor can also connect with a liquid valve to reduce the discharge temperature and enlarge the envelope.

• Enlarged operating envelope: The liquid injection of refrigerant into the compressor will ash and absorb heat from the compressed gas and scroll set leading to cooling of the discharge gas, thus keeping the discharge gas temperature within safe limits. The enlarged operating envelope is therefore based on the same suction status.

5FRCC.PC.039.A1.02

Compressor model designation

Nomenclature

GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION

Family, Refrigerant & lubricant

LLZ: low temperature refrigeration,

R404A, R507 & PVE lubricant

Nominal capacity

In thousand Btu/h at 60 Hz, ARI, LBP conditions

Model variation

T: design optimised for refrigeration

Danfoss scroll compressor LLZ for R404A, R507 is available as single compressor and can be assembled in manifolding combinations.

Type FeaturesMotorSize

LLZ Q 9T 4 L

013

The example below presents the compressor nomenclature which equals the technical reference as shown on the compressor nameplate. Code numbers for ordering are listed section “Ordering information and packaging”.

Other features

Oil sight

glass

Threaded

Tubing and electrical connections

Q: rotolock connections, screw terminals

Motor protection

L: internal motor protection

Motor voltage code

2: 200-220V/3~/50 Hz & 208-230V/3~/60 Hz 4: 380-415V/3~/50 Hz & 460V/3~/60 Hz 9: 380V/3~/60 Hz

Oil

equalisation

None Schrader None

Oil

drain

LP gauge

port

equalisation

Gas

port

None

6 FRCC.PC.039.A1.02

Technical specications

50-60 Hz data Model with activated economizer line only

Models

Refrigerant

Nominal

tons 60 Hz

TR W Btu/h W W/W Btu/h/W cm

Nominal cooling

capacity

Power

input

COP E.E.R.

Swept

volume

Displace-

ment 

/rev m3/h dm

Oil charge

Net weight

LL Z013 4 4044 138 02 3 011 1.34 4.57 67. 4 11.7 1.62 42

LL Z015 5 4840 16519 3511 1.38 4.71 83.5 14. 5 1.62 42

50 Hz

R404A/507*

LLZ018 6 5766 19679 4041 1.43 4.88 97. 6 17 1.62 43

LLZ024 8 7242 24717 4994 1.45 4.95 120 .2 20.9 2.51 46

LLZ034 10 9907 33812 6597 1.50 5.12 168.7 29.4 2.51 51

LL Z013 4 4863 16597 3482 1.40 4.78 67.4 14.2 1.62 42

LL Z015 5 5778 19720 415 8 1.39 4.74 83.5 17.5 1.62 42

60 Hz

R404A/507*

LLZ018 6 6905 23567 4739 1.46 4.98 97.6 20.5 1.62 43

LLZ024 8 8555 29198 5784 1.48 5.05 120. 2 25.3 2.51 46

LLZ034 10 12 041 4109 6 7807 1.54 5.26 168.7 35.4 2. 51 51



Displacement at nominal speed: 2900 rpm at 50 Hz, 3500 rpm at 60 Hz

 Net weight with oil charge

TR: Ton of Refrigeration, Standard rating conditions: EN12900 Evaporating temperature: -35 °C Superheat: 10 K EER: Energy Eciency Ratio Refrigerant: R404A* Condensing temperature: 40 °C Subcooling: 5 K COP: Coecient Of Performance Economizer SH: 5 K Economizer ΔT: 5K All of the compressor performance test after run-in 72h *R507 performance data are nearly identical to R404A performance data Subject to modication without prior notication. Data given for motor code 4 compressor, for full data details and capacity tables refer to Online Datasheet Generator: www.danfoss.com/odsg

Model without activated economizer line, without liquid injection



GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION

Models

Refrigerant

Nominal

tons 60 Hz

TR W Btu/h W W/W Btu/h/W cm

Nominal cooling

capacity

Power

input

COP E.E.R.

Swept

volume

Displace-

ment 

/rev m3/h dm

Oil charge

LL Z013 4 2417 8249 2366 1.02 3.48 67.4 11. 7 1.62 42

LL Z015 5 2937 10024 2776 1.06 3.62 83.5 14.5 1.62 42

50 Hz

R404A/R507*

LLZ018 6 3453 117 85 3150 1.10 3.75 97. 6 17 1.62 43

LLZ024 8 4 411 15055 3957 1.11 3.79 120.2 20.9 2.51 46

LLZ034 10 6051 20652 5458 1.11 3.79 168 .7 29.4 2.51 51

LL Z013 4 2896 9884 2774 1.04 3.55 67.4 14.2 1.62 42

LL Z015 5 3552 1212 3 3307 1.07 3.65 83.5 17.5 1.62 42

60 Hz

R404A/R507*

LLZ018 6 4228 1443 0 3799 1.11 3.79 97. 6 20.5 1. 62 43

LLZ024 8 5278 18014 4 611 1.14 3.89 120.2 25.3 2. 51 46

LLZ034 10 740 4 25270 6157 1.20 4.10 168.7 35.4 2.51 51



Displacement at nominal speed: 2900 rpm at 50 Hz, 3500 rpm at 60 Hz

 Net weight with oil charge

TR: Ton of Refrigeration, Standard rating conditions: EN12900 Evaporating temperature: -35 °C Superheat: 10 K EER: Energy Eciency Ratio Refrigerant: R404A* Condensing temperature: 40 °C Subcooling: 0 K COP: Coecient Of Performance All of the compressor performance test after run-in 72h *R507 performance data are nearly identical to R404A performance data Subject to modication without prior notication. Data given for motor code 4 compressor, for full data details and capacity tables refer to Online Datasheet Generator: www.danfoss.com/odsg

Net weight



7FRCC.PC.039.A1.02

Technical specications

50-60 Hz data Model with activated economizer line only

Models

Refrigerant

Nominal

tons 60 Hz

TR W Btu/h W W/W Btu/h/W cm

Nominal cooling

capacity

Power

input

COP E.E.R.

Swept

volume

Displace-

ment 

/rev m3/h dm

Oil charge

LL Z013 4 4819 16447 3087 1.56 5. 32 6 7.4 11.7 1.62 42

LL Z015 5 5713 19498 3595 1.59 5.43 83.5 14.5 1.62 42

50 Hz

R404A

GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION

LLZ018 6 6806 23229 4137 1.64 5.60 97. 6 17 1.62 43

LLZ024 8 8548 29174 5113 1.67 5.70 120.2 20.9 2.51 46

LLZ034 10 11624 39672 6805 1.71 5.84 168.7 29.4 2.51 51

LL Z013 4 5776 19713 3573 1.62 5.53 67. 4 14.2 1.62 42

LL Z015 5 6821 23280 4266 1.60 5.46 83.5 17. 5 1.62 42

60 Hz

R404A

LLZ018 6 8152 27823 48 61 1.68 5.73 97. 6 20.5 1.62 43

LLZ024 8 10100 34471 5934 1.70 5.80 120. 2 25.3 2. 51 46

LLZ034 10 14028 47877 8055 1.74 5.94 168.7 35.4 2.51 51



Displacement at nominal speed: 2900 rpm at 50 Hz, 3500 rpm at 60 Hz

 Net weight with oil charge

TR: Ton of Refrigeration, Standard rating conditions: ARI Evaporating temperature: -31.7 °C Superheat: 50 K EER: Energy Eciency Ratio Refrigerant: R404A* Condensing temperature: 40.6 °C Subcooling: 5 K COP: Coecient Of Performance Economizer SH: 5 K Economizer ΔT: 5K All of the compressor performance test after run-in 72h *R507 performance data are nearly identical to R404A performance data Subject to modication without prior notication. Data given for motor code 4 compressor, for full data details and capacity tables refer to Online Datasheet Generator: www.danfoss.com/odsg

Model without activated economizer line, without liquid injection

Net weight



Models

Refrigerant

Nominal

tons 60 Hz

TR W Btu/h W W/W Btu/h/W cm

Nominal cooling

capacity

Power

input

COP E.E.R.

Swept

volume

Displace-

ment 

/rev m3/h dm

Oil charge

Net weight

LL Z013 4 3213 10966 2507 1.28 4.37 67. 4 11. 7 1.62 42

LL Z015 5 3898 133 04 2949 1.32 4. 51 83.5 14.5 1.62 42

50 Hz

R404A

LLZ018 6 4583 15642 3346 1.37 4.68 97.6 17 1.62 43

LLZ024 8 5854 19980 4204 1.39 4.74 120 .2 20.9 2. 51 46

LLZ034 10 7991 27273 5772 1.38 4.71 168 .7 29.4 2.51 51

LL Z013 4 3857 13164 2938 1. 31 4.47 67.4 14.2 1.62 42

LL Z015 5 4718 16102 3507 1.35 4. 61 83.5 17. 5 1.62 42

60 Hz

R404A

LLZ018 6 5616 19167 4028 1.39 4.74 97. 6 20.5 1.62 43

LLZ024 8 7 011 23928 4889 1.43 4.88 120. 2 25.3 2.51 46

LLZ034 10 9791 33416 6616 1.48 5.05 168.7 35.4 2.51 51



Displacement at nominal speed: 2900 rpm at 50 Hz, 3500 rpm at 60 Hz

 Net weight with oil charge

TR: Ton of Refrigeration, Standard rating conditions: ARI Evaporating temperature: -31.7 °C Superheat: 50 K EER: Energy Eciency Ratio Refrigerant: R404A* Condensing temperature: 40.6 °C Subcooling: 0 K COP: Coecient Of Performance All of the compressor performance test after run-in 72h *R507 performance data are nearly identical to R404A performance data Subject to modication without prior notication. Data given for motor code 4 compressor, for full data details and capacity tables refer to Online Datasheet Generator: www.danfoss.com/odsg



8 FRCC.PC.039.A1.02

Technical specications

50-60 Hz data Model with liquid injection only

Models

Refrigerant

Nominal

tons 60 Hz

TR W Btu/h W W/W Btu/h/W cm

Nominal cooling

capacity

Power

input

COP E.E.R.

Swept

volume

Displace-

ment 

/rev m3/h dm

Oil charge

Net weight

LL Z013 4 2255 7694 2285 0.99 3.38 6 7.4 11 .7 1.62 42

LL Z015 5 2 814 9601 2811 1.00 3.41 83.5 14.5 1.62 42

50 Hz

R404A/507*

LLZ018 6 3307 112 83 3247 1.02 3.48 9 7.6 17 1.62 43

LLZ024 8 4086 13941 4016 1.02 3.47 120. 2 20.9 2.51 46

LLZ034 10 5807 19 813 5619 1.03 3. 53 168.7 29.4 2.51 51

LL Z013 4 2754 9397 2750 1. 00 3.41 67.4 14.2 1.62 42

LL Z015 5 3407 116 25 3355 1.02 3.46 83.5 17.5 1.62 42

60 Hz

R404A/507*

LLZ018 6 4031 13754 3809 1. 06 3.61 97.6 20.5 1.62 43

LLZ024 8 5024 17142 4703 1.07 3.64 120. 2 25.3 2 .51 46

LLZ034 10 7154 24409 6383 1.12 3.82 168.7 35.4 2.51 51



Displacement at nominal speed: 2900 rpm at 50 Hz, 3500 rpm at 60 Hz

 Net weight with oil charge

TR: Ton of Refrigeration, Standard rating conditions: EN12900 Evaporating temperature: -35 °C Superheat: 10 K EER: Energy Eciency Ratio Refrigerant: R404A* Condensing temperature: 40 °C Subcooling: 0 K COP: Coecient Of Performance All of the compressor performance test after run-in 72h *R507 performance data are nearly identical to R404A performance data Subject to modication without prior notication. Data given for motor code 4 compressor, for full data details and capacity tables refer to Online Datasheet Generator: www.danfoss.com/odsg All of these performance data base on using the injection valve: Sporlan Y1037-1/2-230-3/8ODFX3/8ODF

Model with liquid injection only



GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION

Models

Refrigerant

Nominal

tons 60 Hz

TR W Btu/h W W/W Btu/h/W cm

Nominal cooling

capacity

Power

input

COP E.E.R.

Swept

volume

Displace-

ment 

/rev m3/h dm

Oil charge

Net weight

LL Z013 4 3027 10341 2403 1.26 4.30 6 7.4 11. 7 1.62 42

LL Z015 5 3777 12887 2957 1.28 4.36 83.5 14.5 1.62 42

50 Hz

R404A/507*

LLZ018 6 4439 15146 3 415 1.30 4.44 9 7.6 17 1.62 43

LLZ024 8 5450 18595 4225 1. 29 4.40 120.2 20.9 2.51 46

LLZ034 10 7 746 26429 5912 1. 31 4.47 168.7 29.4 2.51 51

LL Z013 4 3694 12604 2896 1.28 4.35 6 7.4 14. 2 1.62 42

LL Z015 5 4569 16688 3533 1.29 4.41 83.5 17.5 1.62 42

60 Hz

R404A/507*

LLZ018 6 5406 18445 4 011 1. 35 4.60 97.6 20.5 1. 62 43

LLZ024 8 6691 22830 4956 1.35 4.60 120.2 25.3 2.51 46

LLZ034 10 9528 32510 6727 1.41 4.83 168.7 35.4 2.51 51



Displacement at nominal speed: 2900 rpm at 50 Hz, 3500 rpm at 60 Hz

 Net weight with oil charge

TR: Ton of Refrigeration, Standard rating conditions: ARI Evaporating temperature: -31.7 °C Superheat: 50 K EER: Energy Eciency Ratio Refrigerant: R404A* Condensing temperature: 40.6 °C Subcooling: 0 K COP: Coecient Of Performance All of the compressor performance test after run-in 72h *R507 performance data are nearly identical to R404A performance data Subject to modication without prior notication. Data given for motor code 4 compressor, for full data details and capacity tables refer to Online Datasheet Generator: www.danfoss.com/odsg All of these performance data base on using the injection valve: Sporlan Y1037-1/2-230-3/8ODFX3/8ODF



9FRCC.PC.039.A1.02

Dimensions

231.9

451

7.2

Single compressors LLZ013-015-018

95.3

231.9

190.25 - 190.75

1°

Schrader valve

and cover

95.3

GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION

133

108.8

Schrader

119.3

78.5 - 80.5

Discharge line Ø1.00" - 14UN (2A)

92 - 94

34°

31°

45°±2°

124.9

suction

106.4

line

sight glass

190.25 - 190.75

Injection line Ø1.00" - 14UN (2A)

Suction line Ø1.25" - 12UN (2A)

478.2

238.4

T₁

T₃

Ring connect screw terminals

C terminal box type

Sight glass

86.4

374.5

302.2

Mounting grommetTerminal box

1.7

T₂

29.5

Ø 41

Recommended torque for mounting bolts: 11 Nm (±1 Nm)

Ø11

5/16" - 18 UNC self tapping

10 FRCC.PC.039.A1.02

Dimensions

Single compressors LLZ024

133

119.3

95.25

231.9

190.25-190.75

108.8 4x Ø19.0 - 20.0

106.4 sight

glass

14°±2°

124.9

suction

line

95.25

190.25-

190.75

231.9

GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION

Discharge line Ø1.25" - 12UN (2A)

92.0-94.0

505.5

278.4

78.5-80.5

34°

31°

45°±2°

Ø183.14-185.14

73°

Injection line Ø1.00" - 14UN (2A)

Suction line Ø1.75" - 12UN (2A)

Sight glass

Schrader valve and cover

7.2

48.4

532.7

414.5

342.2

126.4

T₁

T₃

Ring connect screw terminals

C terminal box type

Mounting grommetTerminal box

1.7

T₂

29.5

Ø 41

Recommended torque for mounting bolts: 11 Nm (±1 Nm)

Ø11

5/16" - 18 UNC self tapping

11FRCC.PC.039.A1.02

Dimensions

7.2

530.5

231.9

Single compressors LLZ034

GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION

133

95.25

190.25 - 190.75

108.8

Schrader

106.4 sight glass

4x Ø19 - 20

124.9

suction

line

95.25

231.9

190.25 - 190.75

119.3

78.5 - 80.5

Discharge line Ø1.25" - 14UN (2A)

92 - 94

303.4

34°

183.14 - 185.14

31°

45°±2°

14°±2°

73°

Injection line Ø1.00" - 14UN (2A)

Suction line Ø1.75" - 12UN (2A)

Sight glass

Schrader valve and cover

557.7

439.5

367.2

12 FRCC.PC.039.A1.02

T₁

T₃

Ring connect screw terminals

C terminal box type

126.4

48.4

Mounting grommetTerminal box

1.7

T₂

29.5

Ø 41

Recommended torque for mounting bolts: 11 Nm (±1 Nm)

Ø11

5/16" - 18 UNC self tapping

Dimensions

Oil sight glass

Schrader

Suction and discharge connections

LLZ scroll compressors come equipped with a threaded oil sight glass with 1"1/8 - 18 UNEF 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 operation.

The oil ll and drain connection and gauge port is a 1/4" male are connector incorporating a schrader valve.

LLZ scroll compressors are factory delivered with rotolock connections only.

Compressor Models

Suction Fitting (in) Discharge Fitting (in) Injection Fitting (in)

LZL013 1"1/4 1" 1"

LL Z015 1"1/4 1" 1"

LLZ018 1"1/4 1" 1"

LLZ024 1"3/4 1"1/4 1"

LLZ034 1"3/4 1"1/4 1"

Rotolock Sizes

Oil sight glass

Schrader valve and cap

GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION

13FRCC.PC.039.A1.02

Electrical data, connections and wiring

Danfoss scroll compressors LLZ are available in 3 dierent motor voltages as listed below.Motor voltage

GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION

Motor voltage code Code 2 Code 4 Code 9

Nominal voltage 200-220V-3 ph 380-415V - 3 ph -

50 Hz

Voltage range 180 -242V* 342-457 V

Nominal voltage 208-230V-3 ph 460V - 3 ph 380V -3 ph

60 Hz

Voltage range 187-253V* 414-5 06 V 342-418V

Wiring connections

The maximum allowable voltage imbalance is 2%. Voltage imbalance causes high amperage over one or several phases, which in turn leads to

% voltage

imbalance

Vavg = Mean voltage of phases 1, 2, 3.

V1-2 = Voltage between phases 1 and 2.

Danfoss scroll compressors LLZ will only

= x 100

compress gas while rotating counter-clockwise (when viewed from the compressor top). Three-phase motors 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 operates in the correct direction (see “Phase sequence and reverse rotation protection”).

The drawings hereafter 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 (start), and R (run).

overheating and possible motor damage. Voltage imbalance is given by the formula:

2 x Vavg

V1-3 = Voltage between phases 1 and 3.

V2-3 = Voltage between phases 2 and 3.

Ring connect screw terminals

C terminal box type

Terminal cover mounting

Terminal cover removal

14 FRCC.PC.039.A1.02

The terminal cover and gasket should be installed prior to operation of the compressor. Respect the "up" marking on gasket and cover and ensure

push

that the two outside tabs of the cover engage the terminal box.

push

Electrical data, connections and wiring

IP rating

Three phase electrical characteristics

The compressor terminal box IP rating according to CEI 529 is IP22 for all models. IP ratings is only valid when correctly sized cable glands of the IP rating is applied. First numeral, level of protection against contact and foreign objects

2 - Protection against object size over 12.5 mm (ngers of similar)

Second numeral, level of protection against water

2 - Protection against dripping water when tilted up to 15°

The IP rating can be upgraded to IP54 with an accessory kit (see section “Accessories”).

Max. operating

current with

economizer

Winding

resistance

Compressor model

Motor voltage code 2

200-220 V / 3 / 50Hz 208-230 V / 3 / 60Hz

Motor voltage code 4

380-415/3ph/50Hz

460V/3ph/60Hz

Motor voltage code 9

380V/3ph/60Hz

LRA MCC

A A A A Ω

LL Z013 123 .0 25.0 16.4 20.0 0.60 LL Z015 180.0 29.0 18.9 23.0 0.50 LLZ018 184. 0 31.0 24.1 29.4 0.43 LLZ024 190 .0 40.0 28.4 34.7 0.37 LLZ034 250.0 50.0 42.4 44.7 0.29 LL Z013 62.0 12.0 8.0 9.8 2.30 LL Z015 88.5 15. 0 9.8 12.0 1.69 LLZ018 90.0 15.0 11.8 14.4 1.61 LLZ024 95.0 21.0 15. 0 18 .3 1.4 8 LLZ034 150. 0 26.0 19.1 22.7 0.84 LL Z013 81.0 14.0 9.4 11.8 1.49 LL Z015 81.0 17.0 11. 3 14.2 1.49 LLZ018 106.0 20.0 13.7 16. 5 1.13 LLZ024 135 .0 21.0 17.1 19. 4 0.93 LLZ034 155.0 29.6 22.9 25.5 0.63

Max. operating

current

GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION

15FRCC.PC.039.A1.02

Electrical data, connections and wiring

LRA (Locked Rotor Amp)

MCC (Maximum Continuous Current)

GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION

Max. operating Current

Winding resistance

Locked Rotor Amp value is the higher average current as measured on mechanically blocked compressor tested under nominal voltage. The LRA value can be used as rough estimation for

The MCC is the current at which the motor protection trips under maximum load and low voltage conditions. This MCC value is the maximum at which the compressor can be operated in transient conditions and out of

The max. operating current is the current when the compressors operate at maximum load conditions and 10% below nominal voltage (+15°C evaporating temperature and +68°C

Winding resistance is the resistance between phases at 25°C (resistance value +/- 7%). Winding resistance is generally low and it requires adapted tools for precise measurement. Use a digital ohm-meter, a "4 wires" method and measure under stabilised ambient temperature. Winding resistance varies strongly with winding temperature. If the compressor is stabilised at a dierent value than 25°C, the measured resistance must be corrected using the following formula:

the starting current. However in most cases, the real starting current will be lower. A soft starter can be applied to reduce starting current.

the application envelope. Above this value, the overload or external electronic module will cutout the compressor to protect the motor.

condensing temperature). Max Oper. A can be used to select cables and contactors. In normal operation, the compressor current consumption is always less than the Max Oper. A. value.

a + t R

= R

tamb

25°C

a + t t

: reference temperature = 25°C

25°C

: temperature during measurement (°C)

amb

: winding resistance at 25°C

25°C

: winding resistance at tamb

amb

_______

25°C

Coecient a = 234.5

Motor protection

Phase sequence and reverse rotation protection

Danfoss scroll compressors LLZ 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

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 dierential between suction and discharge; and suction line warming rather than immediate cooling. A

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 60°C to reset. Depending on ambient temperature, this may take up to several hours.

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.

Phase monitors are required for LLZ compressors. The selected phase monitor should lock out the compressor from operation in reverse.

16 FRCC.PC.039.A1.02

Approval and certicates

Pressure equipment

directive 97/23/EC

Low voltage directive

2006/95/EC

Machines directive

2006/42/EC

LLZ scroll compressors comply with the following approvals and certicates.

CE 0062 or CE 0038 or CE0871 (European Directive)

UL (Underwriters Laboratories)

Other approvals / certicates Contact Danfoss

*LVD compliant without Annex AA

Products LLZ013-034

Refrigerating uids Group 2 Category PED I Evaluation module no scope

Products LLZ013-034

Declaration of conformity ref. Low voltage Directive 2006/95/EC

Products LLZ013-034

Manufacturer’s declaration of incorporation ref. Machines Directive 2006/42/EC

Certicates are listed on the product datasheets: http://www.danfoss.com/odsg

All LLZ models

Contact Danfoss

GENERAL INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION PRODUCT INFORMATION

Internal free volume

Products Internal free volume at LP side without oil (litre)

LLZ013-015-018 4.74 LLZ024-034 5.95

17FRCC.PC.039.A1.02

Design piping

U-trap, as short as possible

U-trap

General requirements Proper piping practices should be employed to:

1. Ensure adequate oil return, even under minimum load conditions (refrigerant speed, piping slopes…). For validation tests see section “Manage oil in the circuit”.

GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN

max. 4 m

g.1

0.5% slope, 4 m/s or more

U-trap, as short as possible

8 to 12 m/s

0.5% slope, 4 m/s or more

Evaporator

To condenser

U-trap

2. Avoid condensed liquid refrigerant from draining back to the compressor when stopped (discharge piping upper loop). For validation tests see section “Manage o cycle migration”.

General recommendations are described in the gures below:

g. 2

Upper loop

Condenser

3D exibility

3. Piping should be designed with adequate three-dimensional exibility to avoid excess vibration. It should not be in contact with the surrounding structure, unless a proper tubing

mount has been installed. For more information on noise and vibration, see section on: “Sound and vibration management”.

18 FRCC.PC.039.A1.02

Design compressor mounting

General requirements

Single compressor requirements

Compressors used in single application must be mounted with exible grommets

Compressors used in parallel application must be mounted with rigid mounting spacers onto rails

LLZ compressors are delivered with exible grommets, accessory mounting kit.

Mounting grommet

1.7

29.5

5/16" - 18 UNC

Ø11

Ø 41

Recommended torque for mounting bolts: 11 Nm (±1 Nm)

self tapping

and the manifold assembly must be mounted with exible grommets onto frame.

During operation, maximum inclination from the vertical plane must not exceed 3 degrees.

The grommets must be compressed until contact between the at washer and the steel mounting sleeve is established. The required bolt size for the LLZ013-034 compressors is M8*45mm. This bolt must be tightened to a torque of 11 Nm.

GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN

19FRCC.PC.039.A1.02

Manage sound and vibration

Compressor sound radiation

GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN

Typical sounds and vibrations in systems can be broken down into the following three categories:

• Sound radiation (through air)

• Mechanical vibrations (through parts and

• Gas pulsation (through refrigerant) The following sections focus on the causes and methods of mitigation for each of the above sources.

structure)

For sound radiating from the compressors, the emission path is air and the sound waves are travelling directly from the machine in all directions.

Sound levels are as follows:

• For compressors running alone:

50 Hz 60 Hz

Compressor model

LL Z013 78 8 80 8 12 0Z5052

LL Z015 80 8 83 8 120Z5052

LLZ018 83 10 84 10 120Z505 2

LLZ024 85 10 86 10 120Z5053

LLZ034 85 8 86 8 120Z5 055

Sound power and attenuation are given at ARI LBP conditions, measured in free space  Attenuation given with acoustic hood

Materials are UL approved and RoHS compliant

Sound power

dB(A)

Attenuation

dBA 

Sound power

dB(A)

Attenuation

dBA 

Acoustic hood

code number

LLZ scroll compressors have a unique discharge valve design that minimizes stopping noise. This results in very low shutdown sound. Note: During compressor shut down, a short reverse rotation sound is generated. The duration of this sound depends on pressure dierence at shut down and should be less than 3 seconds. This phenomenon has no impact on compressor reliability.

Mitigations methods: We can consider two means to reduce compressors sound radiations:

1. Acoustic hoods are quick and easy to install and do not increase the overall size of the compressors to a great extent. Acoustic hoods are available from Danfoss as accessories. Refer to table above for sound levels, attenuation and code numbers.

2. Use of sound-insulation materials on the inside of unit panels is also an eective means to reduce radiation.

20 FRCC.PC.039.A1.02

Manage sound and vibration

Mechanical vibrations

Gas pulsation

Vibration isolation constitutes the primary method for controlling structural vibration. LLZ scroll compressors are designed to produce minimal vibration during operations. The use of rubber isolators on the compressor base plate or on the frame of a manifolded unit is very eective in reducing vibration being transmitted from the compressor(s) to the unit. Rubber grommets are supplied with all LLZ scroll compressors.

Once the supplied rubber grommets have been properly mounted, vibration transmitted from the compressor base plate to the unit are held to a strict minimum. In addition, it is

The LLZ scroll compressors have been designed and tested to ensure that gas pulsation has been minimized for the most commonly encountered refrigeration pressure ratio. On installations where the pressure ratio lies beyond the typical range, testing should be conducted under all expected conditions and operating congurations to ensure that minimum gas pulsation is present.

extremely important that the frame supporting the mounted compressor be of sucient mass and stiness to help dampen any 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 vibration without incurring any damage. Tubing should also be designed for three-dimensional exibility. For more information on piping design, please see the section entitled “Essential piping design considerations”.

Mitigations methods: If an unacceptable level is identied, a discharge muer with the appropriate resonant volume and mass can be installed.

GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN

21FRCC.PC.039.A1.02

Manage operating envelope

Saturated discharge temperature (°C)

Saturated suction temperature (°C)

RGT 18.3°C

SH 20K

LLZ No Injection Operating Envelope (R404A/R507)

-45 -40 -35 -30 -25 -20 -15 -10 -5

Saturated discharge temperature (°C)

Saturated suction temperature (°C)

RGT 18.3°C

LLZ with economizer Operating Envelope (R404A/R507)

-45 -40 -35 -30 -25 -20 -15 -10 -5

Requirement

GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN

The operating envelope for LLZ scroll

compressors is given in the gures below and

Steady-state operation envelope is valid for a

suction superheat high than 5K guarantees reliable operations of the compressor for steady-state and operation.

LLZ compressor operating envelop are dierence with refrigerant and with/with out injection. The detail as following.

LLZ Compressor with R404A/R507, code2/4/9, Non Injection

LLZ Compressor with R404A/R507, code2/4/9, with economizer line

22 FRCC.PC.039.A1.02

Saturated discharge temperature (°C)

Saturated suction temperature (°C)

20°C RGT No LI

20°C RGT+LI

30K SH+LI

LLZ Liquid Injection Operating Envelope (R404A/R507)

-45 -40 -35 -30 -25 -20 -15 -10 -5

Manage operating envelope

LLZ Compressor with R404A/R507, code2/4/9, with liquid injection(LI)

GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN

Pressure settings R404A/R507

Working range high side bar(g) 5. 94 -27. 74

Working range low side bar(g) 0.33-3.34

Maximum high pressure safety switch setting bar(g) 29.7

Minimum low pressure safety switch setting bar(g) 0.15 Minimum low pressure pump-down switch setting bar(g) 0.33

LP and HP safety switches must never be bypassed nor delayed and must stop all the compressors.

HP safety switch must be manual reset

Depending on application operating envelope, you must dene HP and LP limits within operating envelope and pressure setting table above.

For LLZ compressors, the external Discharge Gas Temperature protection (DGT) is required if the high and low pressure switch settings do not protect the compressor against operations beyond its specic application envelope.

The discharge gas thermostat accessory kit (code

7750009) includes all components required for installation as shown on the right. DGT installation must respect below requirements:

When caused low by LP safety switch, limit the number of auto-restart to maximum 5 times within 12 hours.

• The thermostat must be attached to the discharge line within 150 mm from the compressor discharge port and must be thermally insulated and tightly xed on the pipe.

• The DGT should be set to open at a discharge gas temperature of 135°C.

Thermostat

Discharge line

Insulation

Bracket

23FRCC.PC.039.A1.02

Manage operating envelope

Evaluate the risk We consider two types of operating envelope

management:

GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN

Basic:

• HP and LP switch

• MOP (Max Operating Pressure) ensured by expansion device

• Condensing pressure control

• (DGT integrated)

HP switch setting

DGT (integrated)

MOP

LP switch setting

Condensing pressure control

Advanced:

• HP and LP sensor

• Operating envelope limits (permanent and transient) integrated into control logic

• (DGT integrated)

No additional test are required

24 FRCC.PC.039.A1.02

Theory of Injection cycle

Theory of Vapor injection cycle

Economizer system conguration

The below schematic shows a system conguration with a heat exchanger acting as an economizer for economized cycle (12345671).

The economizer is used to provide subcooling to the refrigerant leaving the condenser before it enters into the evaporator. This subcooling process provides an increased capacity gain for

the system. Meanwhile, another small amount of refrigerant leaving the condenser goes through the expansion device and is then evaporated and superheated. The superheated refrigerant is then injected into the mid-compression cycle of the compressor and compressed together with the suction ow. The injected vapour also provides cooling and therefore lowers the disch arge temperature.

Economizer cycle 12345671

m+i

GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN

Theory of liquid injection cycle

Liquid injection system conguration

The below schematic shows a system conguration with a liquid injection cycle(1234561). The liquid refrigerant is injected into scroll pocket, the injected liquid will ash and absorb heat from compressed gas and scroll set then cooling the discharge gas, keep discharge gas temperature within safe limits.

Liquid injection is achieved by utilization of a Discharge Temperature Responsive Expansion Valve. The same valve can be used for all LLZ models with R404A. The valve can regulates the injection mass ow according to discharge temperature.

An additional solenoid valve has to be installed in case of power shortage to prevent from liquid injection.

For the liquid injection system to be eective, a minimum of 5°K sub cooled liquid at the at the injection valve inlet is required. To prevent a partial or full blockage at the injection port caused through shavings, foreign bodies etc a lter should be installed in the liquid line prior to the injection valve inlet.

Liquid injection cycle 1234561

25FRCC.PC.039.A1.02

Theory of Injection cycle

TREV installation o Recommended TREV : Sporlan

Y1037-1/2-230-3/8ODFX3/8ODF

o Liquid injection special accessories:

• Thermal insulator 1pc

• Rotolock sleeve 1" to 3/8" injection connection 1pc

• Gasket o-ring 1pc

o Sleeve solder and valve location

GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN

Insert nut rst , solder sleeve with valve outlet pipe (Figure A) ; It is not necessary to disassemble the TREV when soldering to the connecting lines.

Figure A Rotolock tting

Any of the commonly used types of solders or brazing materials,e.g., 95-5, Sil-Fos, Easy-Flo, Phos-Copper, Stay Brite 8 or equivalents may be used for copper to copper connections. It is important, however, regardless of the solder used, to direct the ame away from the valve body. As an extra precaution, a wet cloth may be wrapped around the body during the soldering operation. Screw the nut with compressor injection tting (Figure A/gureB) ;Valve position should be 30°to 45°with compressor center axis ,the nut screw torque is 80±10NM.

Figure B Valve location

26 FRCC.PC.039.A1.02

Theory of Injection cycle

o Bulb location (Figure C)

• Good thermal contact between the bulb and discharge line is essential. Before assembly, make sure the pipe and bulb surface is clean, remove oil and impurities. We recommend to add thermal Conductive Adhesive or silver paint at the contact surface .

• Strapping the sensing bulb as close to the compressor discharge valve as possible, not to

Figure C Bulb location

exceed 20cm.Strap the center of the bulb with discharge pipe, the screw force should be taken care, otherwise the bulb will be deformed, the setting will be changed.

• The control temperature of the valve may be slightly higher due to the cooling eects of ambient temperature on the sensing bulb. Therefore, insulating the bulb with insulator is mandatory. Remove the paper surface, align the cut with clamp, wrap around bulb.

GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN

* Others refer to Sporlan SD-168 “Installation & eld service instructions” delivered with valve.

27FRCC.PC.039.A1.02

Manage superheat

Requirement

GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN

Evaluate the risk

During normal operation, refrigerant enters the compressor as a superheated vapor. Liquid ood back occurs when a part of the refrigerant entering the compressor is still in liquid state.

In steady state conditions,

• suction superheat must be higher than 5K

• Discharge superheat must be higher than 15K

• Oil superheat must be higher than 10K

Discharge temperature sensor must be placed onto the discharge tting and be insulated.

Oil temperature sensor must be placed between oil sight glass and compressor baseplate and be insulated.

Use the tables below in relation with the system charge and the application to quickly evaluate the risk and potential tests to perform.

BELOW charge limit ABOVE charge limit

No test or additional safeties required Liquid ood back test

Liquid ood back can cause oil dilution and, in extreme situations lead to liquid slugging that can damage compression parts.

In transient conditions,

• Discharge superheat must be higher than 5K

• Oil superheat must be higher than 10K

Charge limit is dened in table below:

Models Refrigerant charge limit (kg)

Single

LLZ013-015-018 4.54

LLZ024-034 7.26

Test, criteria and solutions

Tes t Purpose Test condition Pass criteria Solutions

Liquid ood back testing must be carried out under expansion valve threshold operating conditions: a high pressure ratio and minimum

Liquid ood back test

Defrost test

Steady-state

Transient

Check liquid oodback during defrost cycle

evaporator load (A).

Tests must be carried out with most unfavorable conditions :

• fan staging,

• compressor staging

• …

Defrost test must be carried out in the most unfavorable condition (at 0°C evaporating temperature)

Oil superheat>10K Steady-state discharge superheat>15K

Oil superheat>10K Transient discharge superheat >5K

1. Check expansion valve selection and setting

2. Add a suction accumulator*

1. Check expansion valve selection and setting.

-For Thermostatic expansion valve (TXV) check bulb position...

-For Electronic expansion valve (EXV) check measurement chain and

PID....

2. Add a suction accumulator*

In refrigeration system, there are dierent defrost method, such as electric method. (for more details see “Control Logic”).

*Suction accumulator oers protection by trapping the liquid refrigerant upstream from the compressor. The accumulator should be sized at least 50 % of the total system charge. Suction accumulator dimensions can impact oil return (gas velocity, oil return hole size…), therefore oil return has to be checked according to section “Manage oil in the circuit”.

28 FRCC.PC.039.A1.02

Manage o cycle migration

Requirement

Evaluate the risk

Test, criteria and solutions

O -cycle refrigerant migration happens:

• when the compressor is located at the coldest part of the installation, refrigerant vapor condenses in the compressor.

• or directly in liquid-phase by gravity.

Amount of liquid refrigerant in the compressors must not overpass the charge limit (refer to charge limit table in section “Manage superheat”)

Use the table below in relation with the system charge (refer to charge limit table in section “Manage superheat”) and the application to

BELOW cHargE Limit aBOV E cHargE Limit

Non split No test or additional safeties required

Since each installation is unique, no test can fully evaluate o-cycle migration, therefore

Split

the following safeties are required:

• Belt type crankcase heater *

• Liquid Line Solenoid Valve**+ pump-down cycle***

When the compressor starts running again, the refrigerant diluted in the oil generates poor lubrication conditions. In extreme situations, this leads to liquid slugging that can damage compression parts.

GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN

quickly dene necessary safeties to implement and test to perform:

• Belt type crank case heater *

• Migration test

• (External Non-Return Valve)

Tes t N° Purpose Test condition Pass criteria Solutions

Migration test

Check that there is no migration of refrigerant into the compressor (either liquid or vapour condensating)

Energize CCH*. Stabilize the non-running system at a pressure equivalent to 5°C . Raise the system pressure equivalent to 20°C. When saturated condensing temperature reaches 20°C then start the unit.

Oil temperature sensor must be placed between oil sight glass and compressor baseplate and be insulated.

*Crank case heater (CCH) The blet type sump heaters are designed to protect the compressor against o-cycle migration of refrigerant. Additional heater power or thermal insulation might be needed in case of ambient temperature below -5°C and a wind speed above 5m/second. The heater must be energized whenever all the

When all compressors are idle:

• Check in liquid line sight glass that there is no liquid refrigerant transfer

• Oil superheat must be >10K during o-cycle

After compressors has started:

• Oil superheat must remain >10K

It is recommended that the heater be turned on for a minimum of 12 hours prior to starting the compressor.

**Liquid line solenoid valve (LLSV) A LLSV is used to isolate the liquid charge on the condenser side, thereby preventing against charge transfer to the compressor during o -cycles. The quantity of refrigerant on the low-pressure side of the system can be further reduced by using a pump-down cycle in association with the LLSV.

1. Check bulb position, tightness of expansion device,

2. add LLSV**

3. add pump down cycle***

4. Check Crank case heater eciency

compressors are o. Crank case heater accessories are available from Danfoss (see section “Accessories”).

***Pump-down cycle By decreasing pressure in the sump, pump down:

• evacuates refrigerant from oil

• set the sump saturating pressure much lower than ambiance temperature and due

Optimum location area

to that, avoid refrigerant condensation in the compressor. Pump-down must be set heigher than 0.33Bar(g) for R404a.

For more details on pump-down cycle see section “Control Logic”.

29FRCC.PC.039.A1.02

Control logic

Safety control logic requirements

HP switch

LP safety switch

GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN

Electronic module (Motor

protection, DGT)

Tripping conditions Re-start conditions

Value Time Value Time

See Pressure settings table

from section “Manage

operating envelope”

Contact M1-M2 opened

Immediate, no delay.

No by- pass

Conditions back to normal.

Switch closed again

Manual reset

Maximum 5 auto reset during

a period of 12 hours, then

manual reset.

Maximum 5 auto reset during

a period of 12 hours, then

manual reset.

Cycle rate limit requirements

Oil management logic recommendations

Danfoss requires a minimum compressor running time of 2 minutes to ensure proper oil return and sucient motor cooling. Additionally, compressor service life is based on a maximum of 12 starts per hour.

T T

A2 A3A1

180 s

In some cases, oil management can be enhanced by control logic:

• If oil return test failed, a function can be integrated in control to run all compressors simultaneously during one minute every hour in order to boost oil return. Time and delay can be ne-tuned by oil return test N°1 in section “Manage oil in the circuit”. During oil boost, pay special attention to superheat management to avoid liquid ood back and foaming.

Therefore, to guarantee these 2 requirements, a three-minute (180- sec) time out is recommended.

• If after running long time in full load, oil unbalance appears, then a function can be in control to stop all compressors in manifold during one minute every two hours in order to balance oil between compressors. Time and delay can be ne-tuned by Oil balancing test N°2 in section “Manage oil in the circuit”.

Defrost logic recommendations

30 FRCC.PC.039.A1.02

In refrigeration system applications, there are dierent defrost methods, such as electric heating defrost, hot gas bypass defrost, reversible defrost etc. For the systems which use hot gas bypass or reversible defrost method, suction accumulator is necessary as a result of the possibility of a substantial quantity of liquid refrigerant remaining in the evaporator.

This liquid refrigerant can then return to the compressor, either ooding the sump or as a dynamic liquid slug when the cycle switch back to normal cooling operations. Sustained and repeated liquid slugging and ooding can seriously impair the oil’s ability to lubricate the compressor bearings. In such cases a suction accumulator is a must.

Control logic

Pump-down logic recommendations

Pump-down cycle: Once the system has reached its set point and is about to shut o, the LLSV on the liquid line closes. The compressor then pumps the majority of the refrigerant charge into the high pressure side before the system stops on the low pressure pump-down switch. This step reduces the amount of charge on the low side in order to prevent o-cycle migration. A pump-down cycle represents one of the most eective ways to protect against the o-cycle migration of refrigerant; however it is only convenient to apply on application with thermostatic control. Rack application with pressostatic control can use timer delay to empty the evaporators before the stop. Time should be carefully set to not interfere with the low safety pressure switch. For low pressure pump-down switch settings, refer to section “High and low pressure protection”. For suggested wiring diagrams, please see section “Wiring diagram”. Under certain conditions, the internal valve may not completely seal, and due to the refrigerant back ow the compressor might restart during pump-down applications. Repeated short cycling can result in a compressor breakdown. It is recommended to install an external magnetic

check valve (such as Danfoss Part No. 120Z5046) close to the compressor’s discharge connector so the discharge volume is minimized. A magnetic check valve is recommended for this as it oers the best solution regarding minimal required and maximal pressure drop over the wide application envelope of the LLZ scroll compressors. If a Danfoss NRV check valve is applied it has to be carefully selected for the specic operation conditions of the individual system.

Tests for pump down cycle approval:

• As the pump-down switch setting is inside the application envelope, tests should be carried out to check unexpected cut-out during transient conditions (i.e. defrost - cold starting). When unwanted cut-outs occur, the low pressure pump-down switch can be delayed. In this case a low pressure safety switch without any delay timer is mandatory.

• While the thermostat is o, the number of pressure switch resets should be limited to avoid short cycling of the compressor. Use dedicated wiring and an additional relay which allows for one shot pump-down.

GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN

31FRCC.PC.039.A1.02

Provide power supply and electrical protection

Wiring information

GENERAL INFORMATIONPRODUCT INFORMATIONINTEGRATION INTO SYSTEMORDERING INFORMATION SYSTEM DESIGN

Requirements:

• An additional external overload protection is still advisable for either alarm or manual reset. For overload setting, take the max current

• Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (e.g. seasonal shutdown).

you can face on the application and add 10%. Setting must always be lower than Max Operating Current (see table…)

The wiring diagrams below are examples for a safe and reliable compressor wiring:

• HP safety switch and DGT must be wired in the safety chain. Other safety devices such as LP can be either hardware or software managed.

The wiring diagrams below are examples for a safe and reliable compressor wiring:

Compressor model LLZ 013 - 015 - 018 - 024 - 034

CONTROL CIRCUIT

F1F1

KA KA

L1 L3 L2

Control device.............................................TH

Optional short cycle timer (3 mins) .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

180 s

LLSV KS

HPs

DGT

Wiring diagram with pump-down cycle

Note: For LLZ phase monitors are mandatory. The selected phase monitor should lock out the compressor from operation in reverse.

32 FRCC.PC.039.A1.02

Reduce moisture in the system

Requirements

Solutions

Excessive air and moisture

• can increase condensing pressure and cause excessively high discharge temperatures.

• can create acid giving rise to copper platting.

• can destroy the lubricating properties of the oil.

LLZ compressors are delivered with < 100 ppm moisture level.

To achieve this requirement, a properly sized and type of drier is required. Important selection criteria’s include:

• driers water content capacity,

• system refrigeration capacity,

• system refrigerant charge.

All these phenomena can reduce service life and cause mechanical and electrical compressor failure.

At the time of commissioning, system moisture content may be up to 100 ppm. During operation, the lter drier must reduce this to a level between 20 and 50 ppm.

For new installations with LLZ compressors with polyolester oil, Danfoss recommends using the Danfoss DML (100% molecular sieve) solid core lter drier.

GENERAL INFORMATIONPRODUCT INFORMATIONSYSTEM DESIGNORDERING INFORMATION INTEGRATION INTO SYSTEM

33FRCC.PC.039.A1.02

Assembly line procedure

Compressor storage

Compressor holding charge

GENERAL INFORMATIONPRODUCT INFORMATIONSYSTEM DESIGNORDERING INFORMATION INTEGRATION INTO SYSTEM

Handling

HEAVY

Store the compressor not exposed to rain, corrosive or ammable atmosphere between

-35°C and 70°C when charged with nitrogen.

Each compressor is shipped with a nominal dry nitrogen holding charge between 0.4 and 0.7 bar and is sealed with elastomer plugs.

Respect the following sequence:

• Remove the nitrogen holding charge via the

suction schrader valve to avoid an oil mist blow out.

Compressor handling

LLZ Compressors are provided with a lifting lug. This lug should always be used to lift the compressor. Once the compressor is installed, the lifting lug should never be used to lift the complete

• Remove the suction plug rst and the discharge plug afterwards to avoid discharge check valve gets stuck in open position. An opened compressor must not be exposed to air for more than 20 minutes to avoid moisture is captured by the PVE oil.

installation. The compressor must be handled with caution in the vertical position, with a maximum inclination of 15° from vertical.

do not lift manually

34 FRCC.PC.039.A1.02

Assembly line procedure

Piping assembly Good practices for piping assembly is a pre-requisite to ensure compressor service life.

System cleanliness

Circuit contamination possible cause: Requirement:

Brazing and welding oxides During brazing, ow nitrogen through the system

Filings and particles from the removal of burrs in pipe-work

Moisture and air

Remove any particles and burrs generated by tube cutting and hole drilling

Use only clean and dehydrated refrigeration grade copper tubing Opened compressor must not be exposed to air more than 20 minutes to avoid moisture captured by POE oil

GENERAL INFORMATIONPRODUCT INFORMATIONSYSTEM DESIGNORDERING INFORMATION INTEGRATION INTO SYSTEM

Brazing procedure:

• Brazing operations must be performed by qualied personnel.

• Make sure that no electrical wiring is connected to the compressor.

• To prevent compressor shell and electrical box overheating, use a heat shield and/or a heatabsorbent compound.

• Clean up connections with degreasing agent

• Flow nitrogen through the compressor.

• Use ux in paste or ux coated brazing rod.

Before eventual un-brazing of the compressor or any system component, the refrigerant charge must be removed.

• Use brazing rod with a minimum of 5% silver content.

• It is recommended to use double-tipped torch using acetylene to ensure a uniform heating of connection.

• For discharge connections brazing time should be less than 2 minutes to avoid NRVI damages if any.

• To enhance the resistance to rust, a varnish on the connection is recommended.

heat shield

System pressure test and leak detection

The compressor has been strength tested and leak proof tested (<3g/year) at the factory. For system tests:

• Pressurize the system on HP side rst then LP side.

• Do not exceed the following pressures:

• Always use an inert gas such as Nitrogen or Helium.

Maximum compressor test pressures

Maximum compressor test pressure high side (HP) 31.1 bar (g)

Maximum compressor test pressure low side (LP) 31.1 bar (g)

35FRCC.PC.039.A1.02

Assembly line procedure

Vacuum evacuation and moisture removal

Refrigerant charging

GENERAL INFORMATIONPRODUCT INFORMATIONSYSTEM DESIGNORDERING INFORMATION INTEGRATION INTO SYSTEM

Dielectric strength and insulation resistance tests

Requirements:

• Never use the compressor to evacuate the system.

• Connect a vacuum pump to both the LP and HP sides.

• Evacuate the system to a pressure of 500 μm Hg (0.67 mbar) absolute.

Initial charge:

• For the initial charge, the compressor must not run.

• Charge refrigerant as close as possible to the nominal system charge.

• This initial charging operation must be done in liquid phase between the condenser outlet and the lter drier.

The tests are performed on each compressor at the factory between each phase and ground.

• Dielectric strength test is done with a high potential voltage (hi-pot) of 2Un +1000V AC at least, and leakage current must be less than 5 mA. Additional tests of this type are not recommended as it may reduce motor lifetime. Nevertheless, if such a test is necessary, it must be performed at a lower voltage.

Recommendations:

• Energized heaters improve moisture removal.

• Alternate vacuum phases and break vacuum. with Nitrogen to improve moisture removal.

For more detailed information see “Vacuum pump-down and dehydration procedure” TI-026-0302.

If needed, a complement of charge can be done:

• In liquid phase while compressor is running by slowly throttling liquid in.

• On the low pressure side, as far away as possible from the compressor suction connection.

• Never bypass safety low pressure switch.

For more detailed information see “Recommended refrigerant system charging practice“ FRCC.EN.050.

• Insulation resistance is measured with a 500 V DC megohm tester and must be higher than 1 megohm.

• The presence of refrigerant around the motor windings will result in lower resistance values to ground and higher leakage current readings. Such readings do not indicate a faulty compressor. To prevent this, the system can be rst operated briey to distribute refrigerant.

Do not use a megohm meter nor apply

power to the compressor while it is under vacuum as this may cause internal damage.

36 FRCC.PC.039.A1.02

Commissioning

Preliminary check

Initial start-up

System monitoring

Check electrical power supply:

• Phase order: For LLZ compressors equipped with an electronic module, reverse rotation will be automatically detected. For more details refer to section “Motor protection”.

• Surface sump heaters must be energized at least 6 hours in advance to remove refrigerant.

• A quicker start-up is possible by “jogging” the compressor to evacuate refrigerant. Start the

The system must be monitored after initial startup for a minimum of 60 minutes to ensure proper operating characteristics such as:

• Correct superheat and subcooling.

• Current draw of individual compressors within acceptable values (max operating current).

• No abnormal vibrations and noise.

• Correct oil level.

• Voltage and voltage unbalance within tolerance: For more details refer to section “Motor voltage”.

compressor for 1 second, then wait for 1 to 2 minutes. After 3 or 4 jogs the compressor can be started. This operation must be repeated for each compressor individually.

If Oil Top-up is needed, it must be done while the compressor is idle. Use the schrader connector or any other accessible connector on the compressor suction line. Always use original Danfoss POE oil 160SZ from new cans. For more detailed information see “Lubricants lling in instructions for Danfoss Commercial Compressors” TI 2-025-0402.

GENERAL INFORMATIONPRODUCT INFORMATIONSYSTEM DESIGNORDERING INFORMATION INTEGRATION INTO SYSTEM

37FRCC.PC.039.A1.02

Dismantle and disposal

GENERAL INFORMATIONPRODUCT INFORMATIONSYSTEM DESIGNORDERING INFORMATION INTEGRATION INTO SYSTEM

Danfoss recommends that compressors and compressor oil should be recycled by a suitable company at its site.

38 FRCC.PC.039.A1.02

Packaging

Single pack

Industrial pack

Compressors are packed individually in a cardboard box. They can be ordered in any quantity. Minimum ordering quantity = 1.

Compressor model

LL Z013 116 9 965 730 460

LL Z015 1169 965 718 460

LLZ018 1169 965 718 468

LLZ024 116 9 965 775 495

LLZ034 1169 965 817 544

Note : Here including 9 single pack compressors

Length

(mm)

Compressors are not packed individually but are shipped all together on one pallet. They can be ordered in quantities of full pallets only,

Compressor model Nbr*

As far as possible, Danfoss will ship the boxes on full pallets of 9 compressors according below table.

Width

(mm)

Height

(mm)

multiples of 12 compressors, according below table.

Length

(mm)

Width

(mm)

Height

(mm)

Gross

weight

(kg)

Gross

weight

(kg)

Static

stacking

pallets

GENERAL INFORMATIONPRODUCT INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION

LL Z013 12 1170 815 665 538 4

LL Z015 12 1170 815 750 538 4

LLZ018 12 1170 815 750 550 4

LLZ024 12 1170 815 720 586 4

LLZ034 12 1170 815 817 651 4

39FRCC.PC.039.A1.02

Ordering codes

Compressor code numbers

Single pack

GENERAL INFORMATIONPRODUCT INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION

Compressor

model

LL Z013 T Q 9 121L9519 121L9517 121L9531

LL Z015 T Q 9 121L9515 121L9513 121L9529

LLZ018 T Q 9 121L9511 121L9509 121L9527

LLz024 T Q 9 121L9507 121L9505 121L9525

LLZ034 T Q 9 121L9523* 121L9521 121L9533*

Note: These codes are preliminary

Model

Variation

Danfoss scroll compressors LLZ can be ordered in either industrial packs or in single packs. Please

Connections Feature

200-230/3/50 208-230/3/60

use the code numbers from below tables for ordering.

Code no.

2 4 9

380-415/3/50

460/3/60

380-400/3/60

Industrial pack

Code no.

Compressor

model

LL Z013 T Q 9 121L9518 121L9516 121L9530

LL Z015 T Q 9 121L9514 121L9512 121L9528

LLZ018 T Q 9 121L9510 121L9508 121L9526

LLz024 T Q 9 121L9506 121L9504 121L9524

LLZ034 T Q 9 121L9522* 121L9520 121L9532*

Note: These codes are preliminary

Model

Variation

Connections Feature

2 4 9

200-230/3/50 208-230/3/60

380-415/3/50

460/3/60

380-400/3/60

40 FRCC.PC.039.A1.02

Accessories

Crankcase heater

Typ e Code No Description Application Packaging

120Z5040 Belt type crankcase heater, 70 W, 240 V, UL, CE mark

120Z5041 Belt type crankcase heater, 70 W, 400/460 V, UL, CE mark Multipack 4

120Z5042 Belt type crankcase heater, 70 W, 575 V, UL, CE mark Multipack 4

120Z0059 Belt type crankcase heater, 65 W, 230 V, UL, CE mark Multipack 6

120Z0060 Belt type crankcase heater, 65 W, 400 V, UL, CE mark Multipack 6

All models

Multipack 4

Discharge temperature protection

Typ e Code No Description Application Packaging

7750009 Discharge thermostat kit All models Multipack 10

7973008 Discharge thermostat kit All models Industry pack 50

Magnetic discharge non return valve

Pack

Size

GENERAL INFORMATIONPRODUCT INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION

Pack

Size

Typ e Code No Description Application Packaging

120Z5046 Magnetic discharge non return valve All models Multipack 6

Lubricant

Typ e Code No Description Application Packaging

120Z5035 PVE lubricant, (0.95 litre can) All models Multipack 1

Pack

Size

Pack

Size

41FRCC.PC.039.A1.02

Accessories

Mounting kit

Typ e Code No Description Application Packaging

Mounting kit for 1 scroll compressor including 4 grommets, 4 sleeves, 4 bolts, 4 washers, rotolock

GENERAL INFORMATIONPRODUCT INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION

120Z0629

120Z0630

connection kit for suction, discharge, economizer tting and Liquid injection tting for 1 scroll compressor including 3 Teon seals, 2 nuts, 3 sleeves, 1thermal insulator.

Mounting kit for 1 scroll compressor including 4 grommets, 4 sleeves, 4 bolts, 4 washers, rotolock connection kit for suction,discharge, economizer tting and Liquid injection tting for 1 scroll compressor including 3 Teon seals, 2 nuts, 3 sleeves, 1thermal insulator.

LLZ013/015/018 single 1

LLZ024/034 single 1

Mounting hardware

Typ e Code No Description Application Packaging

120 Z5 017 Mounting grommet All models Single Pack 1

120Z5014 Mounting sleeve All models Single Pack 1

120Z5031 Mounting kit, including 1 bolt, 1 sleeve, 1 washer All models Single Pack 1

120Z5064

Mounting kit for 1 scroll compressor including 4 grommets, 4 sleeves, 4 bolts, 4 washers

All models Single Pack 1

Pack

Size

Pack

Size

Acoustic hood

Typ e Code No Description Application Packaging

120Z5052 Acoustic hood for scroll compressor LL Z013-015- 018 Single pack 1

120Z5053 Acoustic hood for scroll compressor LLZ024 Single pack 1

120Z5055 Acoustic hood for scroll compressor LLZ034 Single pack 1

Pack

Size

42 FRCC.PC.039.A1.02

Accessories

Terminal box

Typ e Code No Description Application Packaging

120Z5018 Square terminal box (C & Q version) C and Q version Multipack 10

IP54 upgrade kit

Typ e Code No Description Application Packaging

118 U0 057 IP54 upgrade kit All models Multipack 6

Pack

Size

GENERAL INFORMATIONPRODUCT INFORMATIONSYSTEM DESIGNINTEGRATION INTO SYSTEMORDERING INFORMATION

Pack

Size

43FRCC.PC.039.A1.02

Danfoss Commercial Compressors

Danfoss Inverter Scrolls

is a worldwide manufacturer of compressors and condensing units for refrigeration and HVAC applications. With a wide range of high quality and innovative products we help your company to find the best possible energy efficient solution that respects the environment and reduces total life cycle costs.

We have 40 years of experience within the development of hermetic compressors which has brought us amongst the global leaders in our business, and positioned us as distinct variable speed technology specialists. Today we operate from engineering and manufacturing facilities spanning across three continents.

Danfoss Turbocor Compressors

Danfoss Scrolls

Danfoss Optyma Condensing Units

Danfoss Maneurop Reciprocating Compressors

Danfoss Light Commercial Refrigeration

Compressors

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.danfoss.com

Danfoss Commercial Compressors, BP 331, 01603 Trévoux Cedex, France | +334 74 00 28 29

Danfoss LLZ013 Application guide

Specifications and Main Features

Frequently Asked Questions

User Manual