Danfoss VZH028-035-044 Application guide

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Application guidelines

Inverter scroll compressors

VZH028-035-044

single

R410A

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Application Guidelines

VZH028-035-044 - single compressors

VZH scroll speciﬁcities .........................................................................................................5

Inverter compressors ...........................................................................................................6

Compressor size ........................................................................................................................................................................................... 6

Frequency converter variants ................................................................................................................................................................. 6

Compressor and frequency converter combinations .................................................................................................................... 6

VLT Compressor Drives literatures .........................................................................................................................................................6

Nomenclature and speciﬁcations ........................................................................................ 7

Compressor nomenclature ...................................................................................................................................................................... 7

Frequency converter nomenclature .....................................................................................................................................................8

Label ................................................................................................................................................................................................................. 8

Serial number................................................................................................................................................................................................ 8

Technical speciﬁcations .......................................................................................................9

Compressor speciﬁcations ....................................................................................................................................................................... 9

Frequency converter speciﬁcations ...................................................................................................................................................... 9

Oil return management ............................................................................................................................................................................ 9

Bearings lubrication ................................................................................................................................................................................... 9

Capacity tables ...........................................................................................................................................................................................10

Dimensions .........................................................................................................................16

VZH028-035-044G/J/H OSG version ...................................................................................................................................................16

VZH028-035-044G/J .................................................................................................................................................................................16

OLS version ..................................................................................................................................................................................................16

Sight glass / Oil level sensor ..................................................................................................................................................................17

Schrader ........................................................................................................................................................................................................17

Suction & discharge connections ........................................................................................................................................................17

Frequency converter dimensions ........................................................................................................................................................17

CDS803 frequency converter ................................................................................................................................................................18

CDS303 frequency converter ................................................................................................................................................................18

Electrical data, connections and wiring ............................................................................19

Supply voltage ............................................................................................................................................................................................19

Compressor electrical speciﬁcations ..................................................................................................................................................19

Terminal cover mounting .......................................................................................................................................................................19

Terminal cover removal ...........................................................................................................................................................................19

Fuses ...............................................................................................................................................................................................................20

Wire sizes ......................................................................................................................................................................................................21

Wiring & EMC protection ........................................................................................................................................................................21

EMC correct installation of an IP20 frequency drive CDS803 ....................................................................................................22

Wiring diagram of CDS803 .....................................................................................................................................................................22

Wiring connections of CDS803 .............................................................................................................................................................23

EMC correct installation of an IP20 frequency drive CDS303 ....................................................................................................24

Wiring diagram of CDS303 .....................................................................................................................................................................24

Wiring connections of CDS303 .............................................................................................................................................................25

Electrical connections ..............................................................................................................................................................................25

Soft-start control ........................................................................................................................................................................................26

Phase sequency and reverse rotation protection ..........................................................................................................................26

IP rating .........................................................................................................................................................................................................26

Motor protection .......................................................................................................................................................................................26

Anti-reverse protection ...........................................................................................................................................................................26

Temperature protection ..........................................................................................................................................................................27

Voltage imbalance ....................................................................................................................................................................................27

Approvals and certiﬁcates .................................................................................................28

Low voltage directive 2014/35/EU ......................................................................................................................................................28

Internal free volume .................................................................................................................................................................................28

Approvals and certiﬁcates ......................................................................................................................................................................28

3AB225886435375en-001201

Application Guidelines

VZH028-035-044 - single compressors

Operating conditions .........................................................................................................29

Application envelopes .............................................................................................................................................................................29

Short cycle timer function ......................................................................................................................................................................30

Discharge gas thermostat ......................................................................................................................................................................31

Oil return management function (single compressor) ................................................................................................................32

High and low pressure protection.......................................................................................................................................................32

Essential piping design considerations .............................................................................................................................................34

System design recommendations .....................................................................................34

Oil management ........................................................................................................................................................................................35

Heat exchangers ........................................................................................................................................................................................36

Refrigerant charge limits ........................................................................................................................................................................36

Oﬀ-cycle migration ...................................................................................................................................................................................36

Liquid ﬂoodback during operation .....................................................................................................................................................37

Manage superheat ....................................................................................................................................................................................38

Speciﬁc application recommendations ............................................................................40

Low ambient compressor operations ................................................................................................................................................40

Brazed plate heat exchangers ...............................................................................................................................................................41

Reversible heat pump systems .............................................................................................................................................................41

Sound generation in a refrigeration or air conditioning system .................................... 43

Running sound level ................................................................................................................................................................................43

Sound and vibration management ....................................................................................................................................................43

Compressor sound radiation .................................................................................................................................................................43

Mechanical vibrations ..............................................................................................................................................................................43

Speed by-pass .............................................................................................................................................................................................43

Gas pulsation ..............................................................................................................................................................................................43

Installation ..........................................................................................................................44

Compressor handling ..............................................................................................................................................................................44

Mounting ......................................................................................................................................................................................................44

Removing connections shipping plugs ............................................................................................................................................44

System cleanliness ....................................................................................................................................................................................45

Tubing ............................................................................................................................................................................................................45

Filter driers ...................................................................................................................................................................................................45

Brazing and soldering ..............................................................................................................................................................................45

Compressor connection ..........................................................................................................................................................................45

High voltage test .......................................................................................................................................................................................46

System pressure test ................................................................................................................................................................................46

Leak detection ............................................................................................................................................................................................47

Vacuum pump down and moisture removal ..................................................................................................................................47

Refrigerant charging ................................................................................................................................................................................47

Commissioning ..........................................................................................................................................................................................47

Oil level checking and top-up ...............................................................................................................................................................48

Trouble shooting ................................................................................................................49

Ordering information .........................................................................................................52

Kit ordering and shipping ......................................................................................................................................................................52

Packaging .....................................................................................................................................................................................................52

Ordering information and packaging ................................................................................................................................................52

VZH converter order information ........................................................................................................................................................53

Accessories ..........................................................................................................................54

Valves, adapters, connectors & gaskets for use on suction and discharge connections .................................................54

Crankcase heaters & thermostats ........................................................................................................................................................54

Lubricant, acoustic hoods and spare parts ......................................................................................................................................54

Spare parts frequency converter .........................................................................................................................................................55

4 AB225886435375en-001201

Application Guidelines

Discharge sensor (dome sensor) for high discharge temperature monitoring, sensor is ﬁtted into top bracket. Discharge sensor is optional.

Intermediate discharge valves for better eﬃciency at low pressure-ratio

VZH scroll speciﬁcities

Single compressors

Scrolls with optimized volume ratio lead to better heat pump application

EMC (Electro-Magnetic Compatibility) bracket provided allows for grounding termination of shielded wire-harness, which reduces EMC emissions between drive and compressor

PVE 32 lubricant

New distributed IPM motor lead to higher power factor

Linear control oil pump

5AB225886435375en-001201

Application Guidelines

Inverter compressors

Single compressors

Compressor size

Frequency converter variants

Inverter technology oﬀers more ﬂexibility in compressor selection than ﬁxed-speed compressors. Selection of the right inverter compressor size can be made by diﬀerent methods:

1. Maximum cooling capacity: Select a compressor size which achieves the peak load system cooling capacity demand at its maximum speed.

2. Nominal cooling capacity: Select a compressor size which achieves the nominal system cooling capacity at a rotational speed of 3600 - 4500 rpm (60-75 rps).

Diﬀerent frequency converter variants are available according to: Frequency converter for VZH028-035-044 200V&400V: CDS803

1. Mains supply voltage:

- 200-240V/3ph/50-60Hz

- 380-480V/3ph/50-60Hz

2. IP class (CDS803 drives are available in IP20 or IP21 (requiring additional kit) housings)

3. Best Seasonal Eﬃciency Ratio: Select a compressor size which achieves the minimum system cooling demand at its minimum speed. Ensure that the compressor is able to cover the peak load system cooling capacity. This selection makes the compressor run for a maximum time at part load where the system eﬃciency is highest.

Performance tables at three speeds can be found in the following pages. Detailed performances can be found in datasheets and in selection programs.

3. RFI (Radio Frequency Interference) class H4

4. Printed Circuit Board (PCB) coated Frequency converter for VZH028-035-044 575V: CDS303

1. Mains supply voltage: 525-600V/3ph/50-60Hz

2. IP class: IP20

3. RFI class HX: No ﬁlter

4. PCB not coated

Compressor and frequency converter combinations

VLT Compressor Drives literatures

When the compressor size and mains voltage have been deﬁned in the above selection criteria, the code number tables from the “Ordering information and packaging” section provides the appropriate frequency converter sizes and up to eight corresponding code numbers for each compressor model.

VLT Compressor Drives User’s Manual (FRCC.ES.017.A1.02) introduces diﬀerent VLT

Note this compressor is equipped with a four-pole electrical motor so the applied frequency from the inverter will be 30 Hz for 15 rps (900 rpm) up to 200 Hz for 100 rps (6000 rpm).

Please refer to the table below

min max

Compressor speed

Drive output frequency Hz 30 200

Compressor Drives literatures: Operating instructions, MCT 10 set-up, Modbus RTU instructions, VLT drawings, etc..

rps 15 100

rpm 900 6000

6 AB225886435375en-001201

Application Guidelines

Compressor nomenclature

Nomenclature and speciﬁcations

Single compressors

BNAGC044ZHV

Variable speed

Family

VZH scroll

Lubricant

PVE 32 (160 HV) lubricant,

R410A refrigerant

Swept volume

in cm³/rev

Design pressure ratio

C: IDV and IEER

optimized

Evolution index:

B : Max. evaporating temperature 27(°C) on operation map

Motor protection type N: no internal motor protection

(protection by drive)

Equipement version A: brazed connections, OSG version B: brazed connections, OLS version

Oil level switch

None

Threaded

OSG (oil sight glass) version

OLS (oil level sensor) version

Oil sight glass

Threaded

None

Motor voltage code to CDS803/CDS303 * G: 380-480V/3~/50 & 60 Hz H: 525-600V/3~/50&60Hz J: 200-240V/3~/50 & 60 Hz

* main supply voltage to frequency converter

7AB225886435375en-001201

A 1234567825

Application Guidelines

Frequency converter nomenclature

Nomenclature and speciﬁcations

Single compressors

H4E20T4P7K5803CDS

Dedicated compressor

drive for VZH scroll

Serie 803/303

output power

P6K0/P7K5/P10K/P11K

Label

in kW

RFI clas

H4/HX

Enclosure protection

IP rating

Main supply voltage

T2: 200-240V/3 ph/50-60 Hz T4: 380-480V/3 ph/50-60 Hz T6: 525-600V/3ph/50-60 Hz

Serial number

Year code

Month code

Plant assembly line code

8 Digit serial number

8 AB225886435375en-001201

Application Guidelines

Technical speciﬁcations

Single compressors

Compressor speciﬁcations

Frequency converter speciﬁcations

Compressor model

VZH028 27. 8 1.5 5.0 6.0 10.0 1.3 26 VZH035 34.9 1.9 6.3 7.5 12.6 1.3 27 VZH044 44.5 2.4 8.0 9.6 16. 0 1.3 27

Mains supply voltage

Supply frequency 50 / 60 Hz

Output voltage 0 - 100 % of supply voltage

Standby power

Inputs

Programmable outputs

Protection functions Over-current protection, low / high current handling

Compressor functions

Swept

volume

(cm³/r ev)

15 rps (m³/h)

CDS803-T2: 200 - 240 V +/-10% (3-phase)

CDS803-T4: 380 - 480 V +/-10% (3-phase)

CDS303-T6: 525 - 600V +/-10% (3-phase)

T2: P6K0/P7K5: 23.17W P10K: 26.23W T4: P6K0/P7K5: 11.3W P10K: 25.5W T6: P7K5: 17W P11K: 29kW

CDS803: 4 digital (0 - 24 V), 2 analog (0 /±10 V or 4 - 20 mA, scalable) CDS303: 6 digital (0-24V), 2 analog (0/+-10V or 4-20mA, scalable)

CDS803: 2 digital (0- 24 V), 2 analog (0-24 V), 2 relay CDS303: 2 digital(0-24V), 1 analogue(0-24V), 2 relay

Pressostat / thermostat function (CDS303 only), short cycle protection, oil return management

Displacement

50 rps (m³/h)

60 rps (m³/h)

100 rps

(m³/h)

Oil charge

(Liters)

Net weight

(kg)

Oil return management

Bearings lubrication

Oil return management function only works under auto mode: After running at low rpm (less than 40 rps) for 120 minutes, the internal lubrication algorithm in the drive will accelerate the compressor speed to 60 rps or above for 60 seconds to ensure suﬃcient lubrication of compressor moving parts.

Warning:

This function is enabled by parameter 28-10 as default setting. Please notice when hands on mode is selected, oil return management will

A speciﬁc oil pump ensures optimal bearing lubrication at all compressor speeds. The speciﬁc oil pump provides suﬃcient bearing lubrication

not work even if parameter 28-10 (oil return management) is set to on. If compressors run below 40 rps for more than 120 minutes, oil return fault alarm (A208) will report on LCP and stop the compressor. Please select hands on mode carefully and only select hands on mode if the OEM has implemented oil return management in the system controller and qualiﬁed oil management. Under such conditions, the compressor could run below 40 rps continually and meanwhile disable drive oil return management 28-10.

at low speeds as well as to avoid excessive Oil Circulation Ratio (OCR) at high speeds.

9AB225886435375en-001201

Application Guidelines

Technical speciﬁcations

Capacity at EN12900 conditions - VZH028CJ-VZH035CJ-VZH044CJ

Te -30 -25 -20 -15 -10 -5 0 5 10 15 20 25

rps

rpm

Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe

Models

5 - - 185 0 0.538 2310 0.525 2860 0.491 3500 0.431 4240 0.340 5100 0. 213 - - - - - - - - - -

25 - - 14 60 0.773 1870 0.797 2350 0 .812 2910 0. 815 3550 0.799 4300 0.76 0 5140 0. 692 6100 0.591 718 0 0.452 8400 0.268 - -

180 0

45 - - - - - - 173 0 1.189 2180 1. 221 2710 1. 247 3310 1.262 4000 1.262 4790 1.241 5690 1.19 4 670 0 1.115 - -

65 - - - - - - - - - - - - - - - - - - - - - - - -

5 3010 1.038 3790 1.053 4730 1.039 5840 0.982 7150 0.867 8680 0.678 104 40 0.402 - - - - - - - - - -

25 2370 1.489 3050 1. 524 3860 1. 569 4820 1.60 9 5930 1.630 7230 1. 618 8730 1.557 10 450 1.433 12400 1.2 32 14600 0.938 1708 0 0.537 - -

3600

45 - - 2280 2.290 2940 2.287 3700 2.318 4600 2.369 5640 2 .426 6850 2.473 8240 2.496 9830 2.482 116 40 2. 414 1368 0 2.278 1598 0 2.060

VZH028CJ

65 - - - - - - - - - - 3760 3.558 4 620 3. 607 5630 3.671 6790 3.736 8130 3.786 9660 3.809 - -

5 5030 1.941 6300 1.9 86 7830 1.976 9650 1.898 117 80 1.739 142 60 1.484 17120 1.12 0 - - - - - - - - - -

25 4000 2.614 515 0 2.744 6500 2.858 8080 2 .942 9920 2.982 120 60 2.964 145 20 2. 876 173 40 2.702 20540 2.4 31 2415 0 2.048 28210 1. 539 - -

100

6000

45 - - 3860 3.806 4980 3.929 6280 4.059 7790 4.183 9540 4.288 11560 4.359 138 80 4.384 16530 4.349 1953 0 4.240 22930 4.043 26730 3.74 6

65 - - - - - - - - - - 6 430 6.008 7910 6.125 9640 6. 233 116 20 6 .319 13890 6.369 16480 6. 370 - -

5 - - 2340 0.655 2930 0.638 3620 0.597 4430 0.524 5370 0.414 6460 0. 261 - - - - - - - - - -

25 - - 1850 0.940 2370 0.969 2970 0.988 3680 0.990 4500 0.971 5440 0.924 6 510 0.8 42 7720 0.719 9090 0.550 10630 0. 329 -

180 0

45 - - - - - - 2190 1.4 46 2770 1.48 4 3430 1. 516 419 0 1. 534 5070 1.534 6070 1.508 7200 1.450 8480 1. 355

65 - - - - - - - - - - - - - - - - - - - - - - - -

5 3810 1.238 479 0 1.25 6 5980 1.240 7390 1.172 9050 1.034 10980 0.809 13210 0.480 - - - - - - - - - -

25 3000 1.776 3870 1. 818 4890 1.872 6100 1.92 0 7510 1.945 9160 1.930 11 050 1.858 13 220 1.710 15 690 1.4 69 1849 0 1.119 21620 0. 641 - -

3600

45 - - 2890 2.733 3720 2.728 4690 2.76 6 5820 2.827 714 0 2.894 8670 2.951 10 430 2.979 124 40 2 .961 1473 0 2.880 17320 2.718 20230 2.458

VZH035CJ

65 - - - - - - - - - - 4760 4.246 5850 4.304 712 0 4.380 8600 4.457 10290 4.518 122 30 4.544 - -

5 6360 2.320 7980 2 .374 9920 2. 363 12220 2.270 14920 2 .079 18060 1. 774 21670 1. 339 - - - - - - - - - -

25 5070 3.125 6520 3. 281 8220 3.417 10220 3 .517 12 560 3.565 152 60 3.54 4 18380 3.438 21950 3 .231 26000 2.907 30570 2.448 35710 1.8 40 - -

100

6000

45 - - 4890 4.551 6300 4.697 7950 4.853 9860 5. 001 120 80 5.127 14 630 5. 212 1757 0 5. 242 20920 5.200 24730 5.070 29020 4.835 3384 0 4. 479

65 - - - - - - - - - - 8140 7.18 4 10020 7.323 122 00 7.453 14710 7. 556 17580 7.615 20860 7. 616 - -

5 - - 3010 0.822 3760 0 .801 4650 0. 749 570 0 0.658 6910 0.520 8300 0.327 - - - - - - - - - -

25 - - 2380 1.180 3040 1.216 3820 1.24 0 4730 1.243 5780 1.219 6990 1.159 8370 1.057 9930 0.903 11 690 0.691 13670 0 .412 - -

180 0

45 - - - - - - 2820 1. 815 3560 1.863 4410 1.903 5390 1.926 6520 1.925 7810 1.893 9260 1. 820 10910 1.701

65 - - - - - - - - - - - - - - - - - - - - - - - -

5 4900 1.555 617 0 1. 578 7690 1.558 9510 1.472 11 64 0 1. 299 14120 1.016 16990 0.602 - - - - - - - - - -

25 3860 2. 231 4970 2.283 6290 2 .351 7840 2 .411 9660 2.4 43 11770 2.424 14210 2.333 17000 2.147 20180 1.845

3600

45 - - 3720 3.432 4780 3 .427 6030 3.473 7480 3.550 9180 3.635 1114 0 3.706 13410 3.741 16000 3 .719 18 940 3. 617 22270 3.414 26 020 3.087

VZH044CJ

65 - - - - - - - - - - 6120 5.332 753 0 5.405 9160 5. 501 11 050 5.598 13240 5. 674 15730 5.707 - -

5 8180 2.903 10260 2.970 1275 0 2.956 15710 2.839 19180 2.601 23220 2. 219 27870 1.675 - - - - - - - - - -

25 6520 3.910 8380 4.105 10570 4. 275 13150 4.400 16150 4.460 19 630 4.434 23640 4. 301 28220 4.0 42 33430 3.636 39320 3.063 45920 2.302 - -

100

6000

45 - - 6280 5.693 8100 5.876 10220 6.071 126 80 6.257 1553 0 6 .413 1882 0 6.520 2260 0 6.558 26910 6.505 31800 6.342 37320 6.048 43520 5.603

65 - - - - - - - - - - 10460 8.987 128 80 9.16 2 15680 9.323 18910 9.452 2 2610 9. 527 26830 9.527 - -

Single compressors

23770 1.405 27810 0.805 - -

To: Evaporating temperature in °C Superheat = 10 K Tc: Condensing temperature in °C Subcooling = 0 K Qo: Cooling capacity in W Pe: Power input in kW (with drive loss)

Note: All performance test data after run-in 72hr

10 AB225886435375en-001201

Application Guidelines

Technical speciﬁcations

Capacity at ARI conditions - VZH028CJ-VZH035CJ-VZH044CJ

Te -30 -25 -20 -15 -10 -5 0 5 10 15 20 25

rps

rpm

Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe

Models

5 - - 1960 0.538 2440 0.525 3020 0.491 3690 0. 431 4480 0. 340 5380 0.213 - - - - - - - - - -

25 - - 1570 0.773 2010 0.797 2520 0. 812 3110 0. 815 3800 0.799 4590 0.760 5490 0.692 6520 0. 591 7670 0.452 8950 0.268 - -

180 0

45 - - - - - - 1910 1.189 2410 1.221 2980 1.247 3640 1.262 4390 1.262 5250 1. 241 6230 1.19 4 7330 1.115 - -

65 - - - - - - - - - - - - - - - - - - - - - - - -

5 3180 1.03 8 4000 1. 053 4990 1.039 617 0 0.982 7550 0.867 9150 0.678 11000 0.402 - - - - - - - - - -

25 2550 1.489 3280 1.524 4150 1. 569 516 0 1.6 09 6360 1. 630 7740 1.618 93 40 1.557 1116 0 1.433 13240 1. 232 15580 0.938 18220 0.537 - -

3600

45 - - 2530 2.290 3240 2.287 4080 2. 318 5060 2.369 6200 2.426 7520 2.473 9030 2.496 10770 2.482 1274 0 2 .414 14960 2. 278 1746 0 2.060

VZH028CJ

65 - - - - - - - - - - 4510 3.558 5520 3.607 6700 3.671 8070 3.736 9640 3.786 1143 0 3.809 - -

5 5320 1.941 6660 1.98 6 8280 1.976 10190 1. 898 1244 0 1.739 15 040 1.484 18040 1.120 - - - - - - - - - -

25 4300 2.614 5530 2 .744 6970 2. 858 8660 2.942 10620 2.982 12900 2.964 1553 0 2. 876 18520 2.702 21930 2.4 31 25770 2.048 30080 1.539 - -

100

6000

45 - - 4270 3.806 5500 3.929 6920 4.059 8580 4.183 1049 0 4.288 1270 0 4.359 15 230 4. 384 18110 4. 349 21380 4. 240 25070 4.0 43 2 9210 3. 746

65 - - - - - - - - - - 7700 6.008 9450 6.12 5 11470 6.233 13 800 6.319 16470 6.369 1950 0 6.370 - -

5 - - 2480 0.655 3090 0.638 3820 0 .597 4680 0.524 5670 0.414 6800 0. 261 - - - - - - - - - -

25 - - 19 90 0.9 40 2540 0.969 319 0 0.988 3940 0.990 4810 0.971 5810 0.924 6950 0.842 8250 0. 719 9700 0.550 113 30 0.329 -

180 0

45 - - - - - - 2420 1. 446 3040 1.48 4 3770 1.516 4600 1.534 5560 1.534 6650 1.50 8 7880 1. 450 9270 1.355

65 - - - - - - - - - - - - - - - - - - - - - - - -

5 4030 1.2 38 5070 1.256 6320 1.240 7810 1.172 9550 1.034 1158 0 0.809 1392 0 0.480 - - - - - - - - - -

25 3230 1.776 4150 1.818 5250 1.872 6540 1.920 8050 1.945 9800 1.930 1182 0 1. 858 14130 1.710 16760 1.4 69 197 20 1. 119 23060 0.641 - -

3600

45 - - 3200 2 .733 4110 2.728 5170 2. 766 6 410 2.827 7850 2.894 9520 2.951 114 40 2.979 13 630 2.961 1612 0 2.880 18940 2.718 22110 2.458

VZH035CJ

65 - - - - - - - - - - 5700 4. 246 6990 4. 304 8480 4.380 10210 4.457 12200 4 .518 14 470 4.544 - -

5 6730 2.320 8430 2.374 104 80 2.363 1290 0 2.270 1574 0 2.079 190 40 1.774 22840 1. 339 - - - - - - - - - -

25 5450 3.125 7000 3.281 8820 3.417 10960 3 .517 13 450 3.565 16330 3.544 19 650 3.438 23450 3. 231 27 760 2.907 32620 2.448 38080 1.840 - -

100

6000

45 - - 5400 4 .551 6960 4.697 8760 4.853 108 60 5.0 01 13280 5 .127 16070 5 .212 19270 5.242 22930 5.20 0 27070 5.070 3174 0 4.835 36980 4.479

65 - - - - - - - - - - 9740 7.18 4 11960 7. 32 3 14 520 7.453 174 70 7. 556 20840 7. 615 246 80 7. 616 - -

5 - - 318 0 0.822 3980 0.801 4910 0.749 6010 0.658 7290 0. 520 8750 0.327 - - - - - - - - - -

25 - - 2550 1.180 3270 1.216 4100 1. 240 5070 1.243 6190 1.219 74 80 1.159 8940 1.057 10610 0.903 124 80 0 .691 145 80 0.412 - -

180 0

45 - - - - - - 3110 1.815 3920 1.863 4850 1.90 3 5920 1.926 715 0 1.925 8550 1. 893 10140 1. 820 11930 1.701

65 - - - - - - - - - - - - - - - - - - - - - - - -

5 5180 1.555 6520 1. 578 8130 1.558 100 40 1.472 12 280 1.2 99 14900 1.016 17 900 0.602 - - - - - - - - - -

25 4150 2.231 5340 2.283 6750 2. 351 8 410 2. 411 1035 0 2.443 1260 0 2.424 152 00 2.333 18170 2 .147 21550 1. 845

3600

45 - - 4110 3.432 5280 3.427 6650 3.473 8240 3.550 1009 0 3.635 12 240 3.706 14710 3. 741 17 530 3.719 20730 3 .617 2436 0 3.414 28430 3.087

VZH044CJ

65 - - - - - - - - - - 7330 5. 332 8990 5.405 10910 5. 501 13130 5.598 15690 5 .674 18610 5.707 - -

5 8650 2.903 10 850 2.970 13470 2.956 16590 2.839 20240 2.601 24490 2. 219 29370 1.675 - - - - - - - - - -

25 7010 3.910 9000 4.105 113 40 4.275 140 90 4.400 173 00 4.460 21010 4.434 25280 4.301 30160 4.042 35700 3.636 41950 3.063 48970 2.302 - -

100

6000

45 - - 6950 5.693 8950 5.876 11 270 6.071 13960 6.257 170 80 6.413 20670 6.520 24790 6.558 29480 6.505 34 810 6.342 40820 6.048 4756 0 5.603

65 - - - - - - - - - - 12530 8.987 1538 0 9.162 186 80 9.323 22470 9.452 26800 9. 527 3174 0 9. 527 - -

To: Evaporating temperature in °C Superheat = 11.1 K Tc: Condensing temperature in °C Subcooling = 8.3 K Qo: Cooling capacity in W Pe: Power input in kW (with drive loss) Rating point: ARI@60 rps To/Tc/SH/SC: 7.2°C/54.4°C/11.1K/8.3K@60rps

Single compressors

25370 1.40 5 29650 0.805 - -

Note: All performance test data after run-in 72hr

11AB225886435375en-001201

Application Guidelines

Technical speciﬁcations

Capacity at EN12900 conditions - VZH028CH-VZH035CH-VZH044CH

Te -30 -25 -20 -15 -10 -5 0 5 10 15 20 25

rps

rpm

Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe

Models

5 - - 185 0 0.557 2310 0.543 2860 0. 508 3500 0.446 4240 0.353 5100 0.223 - - - - - - - - - -

25 - - 14 60 0.799 1870 0.823 2350 0.839 2910 0. 842 3550 0.825 4300 0.785 5140 0.716 6100 0 .612 7180 0.469 8400 0 .281 - -

180 0

45 - - - - - - 173 0 1. 228 218 0 1. 261 2710 1. 288 3310 1.303 4000 1. 303 4790 1. 280 5690 1.232 670 0 1.151 - -

65 - - - - - - - - - - - - - - - - - - - - - - - -

5 3010 1.037 3790 1.053 473 0 1.039 5840 0.982 715 0 0.866 8680 0.678 104 40 0.402 - - - - - - - - - -

25 2370 1.488 3050 1. 523 3860 1. 568 4820 1.60 8 5930 1.630 7230 1 .617 8730 1. 556 10 450 1.432 12 400 1. 231 14 600 0.938 1708 0 0.537 - -

3600

45 - - 2280 2.289 2940 2.286 370 0 2.317 4600 2.368 5640 2. 425 6850 2. 472 8240 2.496 9830 2. 481 116 40 2. 413 13 680 2.277 15980 2.059

VZH028CH

65 - - - - - - - - - - 3760 3.557 4 620 3.606 5630 3.670 6790 3.734 8130 3.785 9660 3. 807 - -

5 5030 1.894 630 0 1.938 7830 1.928 9650 1.852 1178 0 1.697 1426 0 1.44 8 1712 0 1.093 - - - - - - - - - -

25 4000 2.551 5150 2.678 6500 2.789 8080 2. 871 9 920 2.910 1206 0 2.893 14 520 2.806 1734 0 2.637 20540 2.372 24150 1.998 28210 1. 502 - -

100

6000

45 - - 3860 3.714 4980 3.834 6280 3.961 7790 4.082 9540 4.184 115 60 4.254 13880 4.279 1653 0 4.244 1953 0 4 .138 22930 3.946 26730 3.656

65 - - - - - - - - - - 6 430 5.863 7910 5.977 9640 6.083 116 20 6.167 13890 6 .216 16 480 6 .216 - -

5 - - 2340 0. 651 2930 0.634 3620 0. 593 4430 0. 520 5370 0. 411 6460 0. 258 - - - - - - - - - -

25 - - 1850 0.935 2370 0.963 2970 0.982 3680 0.984 4500 0.965 5440 0.918 6510 0. 836 7720 0.714 9090 0.546 10 630 0.325 -

180 0

45 - - - - - - 2190 1.438 2770 1. 476 3430 1.507 419 0 1.526 5070 1.525 6070 1.4 99 7200 1. 442 8480 1. 347

65 - - - - - - - - - - - - - - - - - - - - - - - -

5 3810 1.242 4790 1.26 0 5980 1.244 7390 1.175 9050 1.037 109 80 0 .811 13210 0.4 81 - - - - - - - - - -

25 3000 1. 781 3870 1.823 4890 1. 877 6100 1.925 7510 1.951 916 0 1.93 6 1105 0 1. 863 1322 0 1. 715 1569 0 1.474 18 490 1.122 21620 0.6 43 - -

3600

45 - - 2890 2. 740 3720 2.736 4690 2.773 5820 2.835 7140 2.902 8 670 2.959 10430 2.987 124 40 2.969 1473 0 2.888 17320 2.726 20230 2.465

VZH035CH

65 - - - - - - - - - - 4760 4.258 5850 4.316 7120 4.392 8600 4.470 10290 4.531 12 230 4.557 - -

5 6360 2.378 7980 2.433 9920 2.421 12220 2.326 1492 0 2 .130 18060 1. 818 21670 1. 372 - - - - - - - - - -

25 5070 3. 203 6520 3.363 8220 3.502 102 20 3.605 12560 3.653 152 60 3.632 183 80 3.523 2195 0 3 .3 11 26000 2.979 30570 2.509 35710 1.886 - -

100

6000

45 - - 4890 4.664 6300 4. 814 7950 4.973 9860 5 .125 120 80 5.254 14630 5 .341 17 570 5.372 20920 5.329 24730 5 .195 29020 4.954 33840 4.590

65 - - - - - - - - - - 8140 7. 36 2 10020 7.50 5 1220 0 7. 638 14710 7. 743 17580 7. 80 4 20860 7. 80 5 - -

5 - - 3010 0. 855 3760 0.833 4650 0.779 570 0 0.685 6910 0.542 8300 0.344 - - - - - - - - - -

25 - - 2380 1.226 3040 1.26 4 3820 1.288 4730 1.292 5780 1. 266 6990 1.204 8370 1.098 9930 0.939 1169 0 0.720 13670 0.433 - -

180 0

45 - - - - - - 2820 1.8 85 3560 1.935 4410 1.976 5390 2.000 6520 1.999 7810 1.964 9260 1. 889 10 910 1.765

65 - - - - - - - - - - - - - - - - - - - - - - - -

5 4900 1.573 6170 1. 596 7690 1.576 9510 1.489 116 40 1. 314 14120 1. 028 169 90 0.609 - - - - - - - - - -

25 3860 2.257 4970 2 .310 6290 2.378 7840 2.439 9660 2.471 11770 2.452 14210 2.360 17000 2.172 20180 1.867

3600

45 - - 3720 3.472 4780 3.467 6030 3. 514 74 80 3.592 9180 3.677 1114 0 3 .749 13410 3.785 16000 3.762 18940 3.659 22270 3.453 26020 3.123

VZH044CH

65 - - - - - - - - - - 6120 5.395 7530 5.468 916 0 5.565 110 50 5.663 13240 5 .740 157 30 5.7 74 - -

5 8180 2.896 10260 2.963 12750 2.949 15710 2 .832 1918 0 2.594 23220 2. 214 27870 1.671 - - - - - - - - - -

25 6520 3.900 8380 4.095 10570 4.265 13150 4.390 16150 4.449 196 30 4.423 23640 4. 291 28220 4.032 33430 3.627 39320 3.056 45920 2.297 - -

100

6000

45 - - 6280 5.679 810 0 5.862 10220 6.056 126 80 6. 241 15530 6.398 1882 0 6.505 22600 6.542 26910 6.489 318 00 6.327 37320 6.033 43520 5.589

65 - - - - - - - - - - 10460 8.965 128 80 9.13 9 15680 9. 301 18910 9.429 22610 9.504 26830 9.504 - -

Single compressors

23770 1.422 27810 0. 815 - -

To: Evaporating temperature in °C Superheat = 10 K Tc: Condensing temperature in °C Subcooling = 0 K Qo: Cooling capacity in W Pe: Power input in kW (with drive loss)

Note: All performance test data after run-in 72hr

12 AB225886435375en-001201

Application Guidelines

Technical speciﬁcations

Capacity at ARI conditions - VZH028CH-VZH035CH-VZH044CH

Te -30 -25 -20 -15 -10 -5 0 5 10 15 20 25

rps

rpm

Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe

Models

5 - - 1960 0.557 2440 0.543 3020 0.508 3690 0.446 4480 0. 353 5380 0.223 - - - - - - - - - -

25 - - 1570 0.799 2010 0.823 2520 0.839 3110 0.842 3800 0.825 4590 0.785 5490 0.716 6520 0. 612 7670 0.469 8950 0. 281 - -

180 0

45 - - - - - - 1910 1.228 2410 1. 261 2980 1. 288 3640 1.30 3 4390 1. 303 5250 1.280 6230 1.232 7330 1.151 - -

65 - - - - - - - - - - - - - - - - - - - - - - - -

5 3180 1.037 4000 1.053 499 0 1. 039 6170 0.982 7550 0.866 9 150 0 .678 11000 0.402 - - - - - - - - - -

25 2550 1.488 3280 1.523 4150 1.568 5160 1.60 8 6360 1.630 7 740 1.617 9340 1. 556 1116 0 1.432 13240 1.231 15580 0.938 1822 0 0.537 - -

3600

45 - - 2530 2.289 3240 2.286 4080 2.317 5060 2.368 6200 2.42 5 7520 2 .472 9030 2.496 10770 2.481 1274 0 2. 413 14960 2.277 174 60 2.059

VZH028CH

65 - - - - - - - - - - 4510 3.557 5520 3.606 6700 3.670 8070 3.734 9640 3.785 1143 0 3. 807 - -

5 5320 1. 894 6660 1.938 8280 1.928 10190 1.852 12440 1.6 97 150 40 1.448 18040 1. 093 - - - - - - - - - -

25 4300 2 .551 553 0 2.678 6970 2.789 8660 2.871 10620 2 .910 1290 0 2.893 15530 2.806 18520 2.637 2193 0 2.372 25770 1.998 30080 1.5 02 - -

100

6000

45 - - 4270 3.714 5500 3.834 6920 3.9 61 8580 4.082 10 490 4 .184 12700 4.254 152 30 4.279 18 110 4.24 4 2138 0 4 .138 25070 3.94 6 2 9210 3.656

65 - - - - - - - - - - 7700 5.863 9450 5.977 11470 6.083 13 800 6 .167 16470 6.216 1950 0 6. 216 - -

5 - - 2480 0.651 3090 0.634 3820 0.593 4680 0.520 5670 0 .411 6800 0.258 - - - - - - - - - -

25 - - 19 90 0.935 2540 0.963 3190 0.982 3940 0.984 4810 0.965 5810 0.918 6950 0.836 8250 0.714 9700 0.546 113 30 0. 325 -

180 0

45 - - - - - - 2420 1.438 3040 1.476 3770 1.507 4600 1. 526 5560 1. 525 6650 1.499 7880 1.442 9270 1. 347

65 - - - - - - - - - - - - - - - - - - - - - - - -

5 4030 1.242 5070 1.2 60 6320 1.244 7810 1.175 9550 1.037 1158 0 0 .811 13920 0.4 81 - - - - - - - - - -

25 3230 1.781 4150 1. 823 5250 1.877 654 0 1.925 8050 1.951 9800 1.936 118 20 1. 863 14130 1.715 1676 0 1. 474 19 720 1.12 2 23060 0.6 43 - -

3600

45 - - 3200 2.74 0 4 110 2.736 5170 2.773 6 410 2. 835 7850 2.902 9520 2.959 11 44 0 2.987 136 30 2.969 1612 0 2.888 18940 2.726 2 2110 2.465

VZH035CH

65 - - - - - - - - - - 5700 4.258 6990 4. 316 8480 4.392 10210 4. 470 122 00 4 .531 14470 4.557 - -

5 6730 2 .378 8430 2.433 104 80 2.421 12 900 2.326 1574 0 2.13 0 190 40 1.818 22840 1. 372 - - - - - - - - - -

25 5450 3.203 7000 3.363 8820 3.502 10960 3.605 13450 3.653 16330 3.632 19650 3.523 23450 3 .311 27760 2.979 32620 2.509 38080 1.886 - -

100

6000

45 - - 5400 4.664 6960 4.814 8760 4.973 108 60 5 .125 13280 5.254 16 070 5.341 19270 5.372 22930 5. 329 27070 5.195 3174 0 4.954 36980 4.590

65 - - - - - - - - - - 9740 7.3 62 11960 7. 50 5 14 520 7.6 38 17470 7. 743 20840 7.80 4 24680 7. 80 5 - -

5 - - 318 0 0.855 3980 0.833 4910 0.779 6010 0.685 7290 0.542 8750 0.344 - - - - - - - - - -

25 - - 2550 1. 226 3270 1.26 4 410 0 1.2 88 5070 1.292 6190 1. 266 7480 1.20 4 8940 1.098 10610 0.939 12 480 0.720 14 580 0.433 - -

180 0

45 - - - - - - 3110 1.885 3920 1. 935 4850 1.976 5920 2.000 715 0 1.999 8550 1.964 1014 0 1.8 89 11 930 1.76 5

65 - - - - - - - - - - - - - - - - - - - - - - - -

5 5180 1.57 3 6520 1. 596 8130 1.576 10040 1.48 9 12280 1. 314 149 00 1. 028 17 900 0.609 - -

25 4150 2 .257 5340 2.310 6750 2.378 8410 2.439 10350 2. 471 12600 2.452 15200 2.360 1 8170 2 .172 21550 1. 867 25370 1.422 29650 0. 815 - -

3600

45 -

VZH044CH

65 - - - - - - - - - - 7330 5. 395 8990 5.468 10910 5.565 13130 5.663 15690 5 .740 18610 5.774 - -

5 8650 2.896 108 50 2.963 13470 2.949 1659 0 2.832 20240 2.594 24490 2.214 29370 1.671 - - - - - - - - - -

25 7010 3.900 9000 4.095 11 34 0 4.265 14090 4. 390 17 300 4.4 49 21010 4 .423 25280 4 .291 30160 4.032 35700 3.627 419 50 3.056 48970 2.297 - -

100

6000

45 - - 6950 5.679 8950 5.862 11270 6.056 13960 6. 241 1708 0 6.398 20670 6.505 24790 6.542 29480 6.489 34810 6.327 40820 6.033 47560 5.589

65 - - - - - - - - - - 12530 8.965 15 380 9.139 186 80 9. 301 22470 9.429 26800 9.504 31740 9.504 - -

- 4110 3.472 5280 3.467 6650 3.514 8240 3.592 10090 3.677 12240 3 .749 14710 3.785 175 30 3.762 20730 3. 659 24360 3.453 28430 3.12 3

Single compressors

Note: All performance test data after run-in 72hr

13AB225886435375en-001201

Application Guidelines

Technical speciﬁcations

Capacity at EN12900 conditions - VZH028CG-VZH035CG-VZH044CG

Te -30 -25 -20 -15 -10 -5 0 5 10 15 20 25

rps

rpm

Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe

Models

5 - - 185 0 0.533 2310 0. 519 2860 0.486 3500 0.426 424 0 0.336 510 0 0 .211 - - - - - - - - - -

25 - - 14 60 0 .766 18 70 0.789 2350 0.804 2 910 0.807 3550 0.791 4300 0.752 514 0 0.686 6100 0.586 7180 0.4 47 8400 0.265 - -

180 0

45 - - - - - - 173 0 1.177 2180 1.208 2710 1. 234 3310 1.249 4000 1. 249 479 0 1.22 8 5690 1.18 2 670 0 1.10 4 - -

65 - - - - - - - - - - - - - - - - - - - - - - - -

5 3010 1.027 3790 1.043 473 0 1.029 5840 0.972 7150 0.858 8680 0.671 10440 0.398 - - - - - - - - - -

25 2370 1.474 3050 1. 509 3860 1.553 4820 1.593 5930 1.614 7230 1.602 8730 1. 541 10450 1.419 124 00 1.219 14600 0.929 170 80 0.532 - -

3600

45 - - 2280 2.268 2940 2. 264 370 0 2.295 4600 2.346 5640 2.402 6850 2.449 8240 2.472 9830 2 .457 116 40 2.390 136 80 2.255 15980 2.040

VZH028CG

65 - - - - - - - - - - 3760 3.523 4620 3.571 5630 3.635 6790 3.699 813 0 3 .749 9660 3.771 - -

5 5030 1.92 2 6300 1.966 7830 1.956 9650 1.879 11780 1.722 14260 1.4 69 17120 1.10 9 - - - - - - - - - -

25 4000 2.588 5150 2.717 6500 2.830 8080 2.913 9920 2.952 120 60 2 .935 14520 2. 847 173 40 2.676 20540 2.407 24150 2.028 28210 1.524 - -

100

6000

45 - - 3860 3.768 4980 3.890 6280 4 .018 7790 4 .141 9540 4.245 115 60 4. 316 138 80 4 .341 1653 0 4. 306 19530 4 .198 22930 4.003 26730 3.709

65 - - - - - - - - - - 6 430 5.9 49 7910 6.064 9640 6.172 1162 0 6. 257 13890 6.306 16 480 6. 307 - -

5 - - 2340 0.648 2930 0.632 3620 0.591 4430 0.519 5370 0 .410 6460 0.258 - - - - - - - - - -

25 - - 1850 0.9 31 2370 0.959 2970 0.978 3680 0.981 4500 0.962 5440 0. 914 6 510 0.833 7720 0.712 9090 0. 545 10 630 0.325 -

180 0

45 - - - - - - 2190 1.432 2770 1. 470 3430 1.501 419 0 1. 519 5070 1. 519 6070 1.4 93 7200 1. 436 8480 1.342

65 - - - - - - - - - - - - - - - - - - - - - - - -

5 3810 1.226 479 0 1. 244 5980 1.228 7390 1.160 9050 1. 024 109 80 0.8 01 13210 0.475 - - - - - - - - - -

25 3000 1. 759 3870 1.80 0 4890 1.853 610 0 1.901 7510 1.926 916 0 1 .911 11 050 1.839 13 220 1.693 15 690 1.455 18 490 1.108 21620 0.635 - -

3600

45 - - 2890 2.706 3720 2 .701 4690 2.738 5820 2.799 7140 2.865 8670 2.921 10430 2.949 12 440 2.932 14730 2.851 17320 2.691 20230 2.434

VZH035CG

65 - - - - - - - - - - 4760 4.204 5850 4.261 712 0 4. 337 8600 4. 413 1029 0 4.473 12230 4.499 - -

5 6360 2.297 7980 2. 351 9920 2.339 12220 2. 247 14920 2.058 18060 1.757 21670 1.326 - - - - - - - - - -

25 5070 3.094 6520 3. 249 8220 3.384 102 20 3.483 12560 3. 530 1526 0 3.509 183 80 3.404 219 50 3.199 26000 2.878 30570 2.424 35710 1. 822 - -

100

6000

45 - - 4890 4.506 6300 4.651 7950 4.805 9860 4.952 120 80 5.076 14630 5 .161 17570 5.190 20920 5 .148 24730 5.019 29020 4.787 3384 0 4.434

65 - - - - - - - - - - 8140 7.112 1002 0 7. 251 12 200 7. 37 9 14710 7. 48 1 17 580 7. 54 0 20860 7. 54 0 - -

5 - - 3010 0 .812 3760 0.791 4650 0.74 0 5700 0.650 6910 0 .513 8300 0.32 3 - - - - - - - - - -

25 - - 2380 1.166 3040 1. 201 3820 1.224 4730 1.22 8 5780 1. 204 6990 1.145 8370 1.043 9930 0. 891 116 90 0.682 13670 0.407 - -

180 0

45 - - - - - - 2820 1.792 3560 1.8 40 4 410 1. 879 5390 1.9 02 6520 1.901 7810 1.869 9260 1.798 10910 1.6 80

65 - - - - - - - - - - - - - - - - - - - - - - - -

5 4900 1.5 40 6170 1.5 62 7690 1.542 9510 1.457 1164 0 1.28 6 1412 0 1.006 1699 0 0.596 - - - - - - - - - -

25 3860 2.209 4970 2. 261 6290 2.327 7840 2.387 9660 2 .419 117 70 2.400 14210 2.310 17000 2 .126 20180 1. 827

3600

45 - - 3720 3.398 478 0 3.393 6030 3.439 7480 3. 515 9180 3.599 1114 0 3.669 13410 3.704 16000 3.682 1894 0 3.581 22270 3.380 26020 3.056

VZH044CG

65 - - - - - - - - - - 6120 5. 280 7530 5.352 9160 5. 447 11 050 5.543 13240 5.618 1573 0 5.651 - -

5 8180 2.897 10260 2.964 12 750 2.950 15710 2.834 19180 2.596 23220 2.215 27870 1.672 - - - - - - - - - -

25 6520 3.902 8380 4.097 10570 4. 267 13150 4.392 16150 4.4 51 1963 0 4.425 23640 4.293 28220 4.034 33430 3.629 39320 3.057 45920 2.298 - -

100

6000

45 - - 6280 5.682 8100 5. 865 10220 6.059 126 80 6. 244 1553 0 6. 401 18820 6.508 2260 0 6.545 26910 6.492 3180 0 6.329 37320 6.036 43520 5.592

65 - - - - - - - - - - 10460 8.969 128 80 9.143 15680 9.305 18910 9. 433 22610 9.508 26830 9. 509 - -

Single compressors

23770 1.391 27810 0.797 - -

To: Evaporating temperature in °C Superheat = 10 K Tc: Condensing temperature in °C Subcooling = 0 K Qo: Cooling capacity in W Pe: Power input in kW (with drive loss)

Note: All performance test data after run-in 72hr

14 AB225886435375en-001201

Application Guidelines

Technical speciﬁcations

Capacity at ARI conditions - VZH028CG-VZH035CG-VZH044CG

Te -30 -25 -20 -15 -10 -5 0 5 10 15 20 25

rps

rpm

Models

VZH028CG

VZH035CG

VZH044CG

Tc Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe Qo Pe

5 - - 1960 0.533 2440 0 .519 3020 0.486 3690 0. 426 4480 0.336 5380 0. 211 - - - - - - - - - -

25 - - 1570 0.766 2010 0.789 2520 0.804 3110 0.807 3800 0.791 4590 0.752 5490 0.686 6520 0.586 7670 0.447 8950 0.265 - -

180 0

45 - - - - - - 1910 1.17 7 2410 1. 208 2980 1.234 3640 1.249 4390 1. 249 5250 1. 228 6230 1.182 7330 1.10 4 - -

65 - - - - - - - - - - - - - - - - - - - - - - - -

5 3180 1.027 4000 1.043 4990 1.029 6170 0.972 7550 0.858 9150 0.671 11000 0. 398 - - - - - - - - - -

25 2550 1.474 3280 1.509 415 0 1.553 516 0 1.593 6360 1. 614 774 0 1.602 9340 1. 541 1116 0 1. 419 13240 1.219 1558 0 0.929 182 20 0.532 - -

3600

45 - - 2530 2.268 3240 2.264 4080 2.295 5060 2.346 6200 2.4 02 7520 2.449 9030 2 .472 10770 2.457 12 740 2.390 14960 2.255 174 60 2.040

65 - - - - - - - - - 4510 3.523 5520 3.571 670 0 3.635 8 070 3.699 9640 3.749 11430 3.771 - -

5 5320 1.92 2 6660 1.96 6 8280 1.956 10190 1.879 124 40 1. 722 150 40 1.4 69 18 040 1.109 - - - - - - - - - -

25 4300 2.588 5530 2 .717 6970 2.830 8660 2 .913 10 620 2.952 129 00 2 .935 15530 2.8 47 18520 2.676 219 30 2.407 25770 2.028 30080 1. 524 - -

100

6000

45 - - 4270 3.768 550 0 3.890 6920 4 .018 8580 4 .141 10490 4.245 1270 0 4. 316 1523 0 4.341 18 110 4.306 21380 4.198 25070 4.003 29210 3.709

65 - - - - - - - - - - 7700 5.949 9450 6.064 11 470 6.17 2 138 00 6.257 16470 6.306 195 00 6.307 - -

5 - - 248 0 0.648 3090 0.632 3820 0.591 4680 0. 519 5670 0.410 6800 0.258 - - - - - - - - - -

25 - - 19 90 0 .931 2540 0.959 3190 0.978 3940 0.981 4810 0.962 5810 0.914 6950 0. 833 8250 0 .712 9700 0.545 113 30 0.325 - -

180 0

45 - - - - - - 2420 1.432 3040 1.470 3770 1.501 4600 1. 519 5560 1.519 6650 1.493 7880 1.436 9270 1.342

65 - - - - - - - - - - - - - - - - - - - - - - - -

5 4030 1. 226 5070 1. 244 6320 1. 228 7810 1.160 9550 1.024 1158 0 0. 801 13920 0 .475 - - - - - - - - - -

25 3230 1.759 4150 1. 800 5250 1.853 6540 1.901 8050 1.926 9800 1.911 1182 0 1.839 14130 1.693 16760 1. 455 19720 1.108 23060 0.635 - -

3600

45 - - 3200 2.706 4110 2 .701 517 0 2.738 6 410 2.799 7850 2.865 9520 2.921 114 40 2.949 13630 2.932 16120 2.851 18940 2.691 2 2110 2.434

65 - - - - - - - - - - 5700 4.20 4 6990 4 .261 8480 4.337 10210 4. 413 122 00 4. 473 14470 4.499 - -

5 6730 2.297 8430 2 .351 10480 2.339 1290 0 2 .247 1574 0 2.058 19 040 1.757 22840 1. 326 - - - - - - - - - -

25 5450 3.094 7000 3. 249 8820 3.384 10960 3.483 13450 3. 530 16330 3.509 19650 3.404 23450 3 .199 27760 2.878 32620 2. 424 38080 1.822 - -

100

6000

45 - - 5400 4.506 6960 4.651 8760 4.805 1086 0 4.952 1328 0 5.076 16070 5.161 19270 5.190 22930 5.14 8 27070 5 .019 31740 4.787 36980 4.434

65 - - - - - - - - - - 9740 7.112 11960 7.2 51 1452 0 7.379 1747 0 7. 481 20840 7. 54 0 24 680 7. 54 0 - -

5 - - 318 0 0.812 3980 0.791 4910 0.74 0 6010 0.650 7290 0 .513 8750 0.323 - - - - - - - - - -

25 - - 2550 1.16 6 3270 1.201 4100 1.224 5070 1.22 8 619 0 1.204 74 80 1.145 8940 1.043 10610 0.891 124 80 0.682 14580 0.407 - -

180 0

45 - - - - - - 3110 1.792 3920 1.840 4850 1.879 5920 1.902 7150 1.901 8550 1.869 10140 1.798 119 30 1.6 80

65 - - - - - - - - - - - - - - - - - - - - - - - -

5 5180 1. 540 6520 1. 562 8130 1.542 10 040 1.457 122 80 1. 286 1490 0 1. 006 179 00 0.596 - - - - - - - - - -

25 4150 2.209 5340 2 .261 6750 2.327 8410 2. 387 1035 0 2.419 126 00 2.400 15200 2 .310 18170 2.12 6 21550 1.827 25370

3600

45 - - 4110 3.398 5280 3. 393 6650 3.439 824 0 3 .515 10090 3. 599 12 240 3.669 14710 3.704 17 530 3.682 20730 3.581 24360 3.380 28430 3.056

65 - - - - - - - - - - 7330 5.280 8990 5.352 10910 5.447 13130 5.543 15 690 5.618 18 610 5.651 - -

5 8650 2. 897 10850 2.964 13 470 2.950 16590 2.834 20240 2. 596 24490 2. 215 29370 1.672 - - - - - - - - - -

25 7010 3.902 9000 4.097 1134 0 4. 267 14090 4.392 173 00 4 .451 21010 4.425 25280 4.293 3016 0 4.034 35700 3.629 41950 3.057 48970 2.298 - -

100

6000

45 - - 6950 5.682 8950 5.865 112 70 6.059 13960 6. 244 17 080 6.4 01 20670 6. 508 24790 6. 545 29480 6.492 34 810 6. 329 40820 6.036 47560 5.592

65 - - - - - - - - - - 12530 8.969 153 80 9.143 186 80 9. 305 22470 9.433 26800 9. 508 3174 0 9.509 - -

Single compressors

1.391 29650 0.797 - -

Note: All performance test data after run-in 72hr

15AB225886435375en-001201

Overall height:

op of sensor bracket

Application Guidelines

Dimensions

Single compressors

VZH028-035-044G/J/H OSG version

Ø164.5

Discharge line 1/2"

(95.25)

239

190.5

Top of sensor bracket

Suction 3/4"

Oil Sight Glass 1 1/8"

Schrader valve and cover

55.0

78.0

230.5

Ø19.5 4X

360.4

404.4

VZH028-035-044G/J OLS version

Discharge line 1/2"

Oil level sensor prism

42.5

(95.25)

Ø164.5

239

190.5

Suction line 3/4"

Organ pipe tting

Schrader valve and cover

55.0

78.0

Ø19.5 4X

404.4

360.4

230.5

129.5

111.3

70.6

(34°) (31°)

109.7

14°±2°

45°±2°

129.5

(60°)

Terminal box (quick connect spade terminals)

109.7

Suction line

(17°)

discharge line

(34°)

(31°)

14°±2°

45°±2°

Note: Manifolding drawing is preliminary version

Mounting Grommet

111.3

All dimensions in mm

16 AB225886435375en-001201

Earth grounding

EMC bracket to terminations of shielded wire

29.5

Ø11

Ø 41

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

Application Guidelines

Dimensions

Single compressors

Sight glass / Oil level sensor

VZH compressors OSG versions come equipped with a threaded oil sight glass with 1"1/8 – 18 UNEF connection. It can be used for a visual check of oil amount and condition.

Schrader

The oil ﬁll connection and gauge port is a 1/4" male ﬂare connector incorporating a schrader valve.

Suction & discharge connections

VZH compressors are all delivered with suction and discharge brazed connections only. They are copper-plated steel connections.

Rotolock adaptors are available, refer to the “Accessories” section.

Compressor models Brazed connection size

VZH028-044

Suction 3/4" 1-1/4" 3/4"

Discharge 1/2" 1" 1/2" 120Z0365

VZH oil level sensor version compressors come equipped with a screw-in optical part on oil level switch port located below the electrical box.

Suction Discharge

VZH028-035-044 3/4" 1/2"

   

Rotolock adaptor set

(adaptor, gasket, sleeve, nut)

Rotolock Solder sleeve ODF Code Number Code Number

120Z0126



Rotolock adaptor

( adaptor only)

120Z0366

Frequency converter dimensions

Drive supply voltage

T2: 200-240/3/50-60

T4: 380-480/3/50-60

T6: 525-600/3/50 -60

Frequency converter dimensions depend on supply voltage, IP rating and power. The table below gives an overview of the overall

Min 100 Clearance above for cooling

dimensions and diﬀerent drive enclosures (H3, H4, H5, A3 and B3). Details for each drive enclosure are on the following pages.

plate

Min 100 Clearance above for cooling

IP20

Drive power

7.5 VZH035 H4 29 6x135x241 359x135x241 100/4 10 VZH044 H5 334x150x255 402 x150x255 100/4

7.5 VZH035 H3 255x100x206 329x100x206 100/4 10 VZH044 H4 296x135x241 359x135x241 100/4

7.5 VZH028 A3 268x13 0x2 05 374x130x205 100/4 11 H VZH035 B3 399x165x249 420x165x249 100/4 11 VZH044 B3 399x165x249 420x165x249 100/4

Compressor

voltage code

Compressor

model

VZH028 H4 29 6x135x241 359x135x241 100/4

VZH028 H3 255x100x206 329x100x206 100/4

Drive enclosure

Overall drive size

(H x W x L) mm

Overall drive size

(H x W x L) mm

incl. decoupling

Clearance above/

below

(mm/inch)

17AB225886435375en-001201

Application Guidelines

CDS803 frequency converter

Dimensions

Single compressors

B b

99 99

Decoupling Plate

Decoupling Plate Illustration

Enclosure Height (mm) Width (mm) Depth (mm) Mounting hole (mm) Max. Weight

Frame IP Class A A

a B b C d e f kg

H3 IP20 255 329 240 10 0 74 206 11 5.5 8.1 4.5 H4 IP20 296 359 275 135 105 241 12.6 7 8.4 7.9 H5 IP20 334 402 314 150 12 0 255 12.6 7 8.5 9.5

Including decoupling plate.

The dimensions are only for the physical units, but when installing in an application it is necessary to add space for free air passage both above and below the units. The amount of space for free air passage is listed in “frequency converter dimensions - Clearance above/below (mm/inch)”.

CDS303 frequency converter

Enclosure Height (mm) Width (mm) Depth (mm) Mounting hole (mm) Max. Weight

Frame IP Class A A

a B b C d e f kg

A3 IP20 268 374 257 130 110 205 11 5.5 9 6.6

B3 IP20 399 420 380 165 140 249 12 6.8 7.9 12

Including decoupling plate.

18 AB225886435375en-001201

Application Guidelines

Electrical data, connections and wiring

Single compressors

Supply voltage

Compressor electrical speciﬁcations

RLA (Rated Load Amp)

MOC (Max Operating Current)

Because VZH compressors are powered by a frequency converter, the mains frequency, 50 or 60 Hz, is no longer an issue. Only the mains voltage is to be taken into account. With 3 motor voltage codes, the most common mains voltages and frequencies are covered. Never connect the VZH compressor directly to the mains power supply in the case motor burns out.

Compressor rated

voltage (V)

414 V max.

210 V max.

RW: Winding resistance per winding, measured at motor terminals RLA: Rated load Amp

Model

VZH044CG /VZH044CH

VZH035CG /VZH035CH 12. 4 14.3

VZH028CG /VZH028CH 10.3 11. 8

VZH044CJ VZH035CJ 26.6 30.6 VZH028CJ 22.0 25.3

RW(Ω) at 20°C line

Rated Load Amp value is the current value at maximum load, in the operating envelope, and

Max operating current is the maximum continuous current which is 115% (VZH044-J is

Voltage code Mains voltage range of drive

to line

0.708±7%

0.185±7 %

200-240 V / 3 ph / 50 Hz & 200-240 V / 3 ph / 60 Hz (±10%)

380-480 V / 3 ph / 50 Hz & 380-480 V / 3 ph / 60 Hz (±10%)

525-600 V / 3ph / 50Hz & 525-600 V /3ph / 60Hz (±10%)

RLA (A)

15. 5 17.8

33.3 36

Max Operating

Current (A)

at maximum speed and maximum drive input voltage.

108%) of RLA. This value is printed on compressor nameplate.

Wiring connections

VZH scroll compressors will only compress gas while rotating counter-clockwise (when viewed from the top of the compressor). The drawing shows electrical terminal labeling and should be used as a reference when wiring the compressor. U, V & W of the drive and the compressor must be connected accordingly. For use of EMC bracket with shielded cable, it is recommended to have a thread cutting screw (#10-32) having a torque of 3NM.

Terminal cover mounting The terminal cover and gasket should be installed

prior to operation of the compressor. The terminal cover has two outside tabs, 180 degrees apart,

Terminal cover removal

push

Earth grounding

EMC bracket to terminations of shielded wire

that engage the terminal fence. When installing the cover, check that it is not pinching the lead wires.

push

19AB225886435375en-001201

Application Guidelines

Electrical data, connections and wiring

Single compressors

Fuses

Danfoss recommends using the fuses listed below to protect service personnel and property in case of component break-down in the frequency converter.

For circuit breakers, Moeller types have been tested and are recommended. Other types of circuit breakers may be used provided they limit the energy to a level equal to or lower than the Moeller types.

UL Compliant fuses Recommended circuit breaker

CDS 803

3x200-240 V IP20

4 TR/VZH028 FRS-R-50 KTN-R50 JKS-50 JJN-50 50 PKZM4-50

5 TR/VZH035 FRS-R-50 KTN-R50 JKS-50 JJN-50 50 PKZM4-50

6.5 TR/VZH044 FRS-R-60 KTN-R60 JKS-60 JJN-60 60 PKZM4-63

3x380-480 V IP20

4 TR/VZH028 FRS-R-25 KTS-R25 JKS-25 JJS -25 25 PK ZM4-25

5 TR/VZH035 FRS-R-25 KTS-R25 JKS-25 JJS -25 25 PK ZM4-25

6.5 TR/VZH044 FRS-R-30 KTS-R30 JKS-30 JJS-30 30 PKZM4-36

CDS 303

525-600V

CDS 303-7.5k W 20A gG KTS-R20 JKS-20 JJS-20 5017906 -020 KLSR020 A6K-20R PKZM4-50

CDS 303-11k W 30A gG KTS-R30 JKS-30 JJS-30 50179 06 -030 KLSR030 A6K-30R PKZM4-50

Bussmann Bussmann Bussmann Bussmann Max fuse

Type RK5 Type RK1 Type J Type T Typ e G Moeller type

EN 50178

Compliant fuses

Size Ty pe Type RK1 Type J Typ e T Type RK1 Type RK1 Type RK1 Moeller type

UL Non UL IP20

UL Compliant fuses

Bussmann SIBA Little fuse

Recommended

circuit breaker

20 AB225886435375en-001201

Application Guidelines

Electrical data, connections and wiring

Single compressors

Wire sizes Below table lists recommended wiring sizes for the motor compressor power supply cables. These

wiring sizes are valid for a cable length up to 20m.

From network to frequency converter From frequency converter to compressor

Typ e mm² AWG Typ e mm² AWG

CDS803-6kW(IP20) 6 10 V ZH028 -J 6 10

200 - 240 V

380 - 400 V

525 - 600 V

Note: 1.The wire size here is the guideline but not the actual cable required. The required cable size should be speciﬁed by the OEM depending on the unit design, ambient temperature, the wire material, current, etc.

CDS803-7.5kW(IP20) 6 10 VZH035-J 6 10

CDS803-10kW(IP20) 6 10 V ZH04 4-J 6 10

CDS803-6kW(IP20) 4 10 VZH028-G 4 10 CDS803-7.5kW(IP20) 4 10 VZH035-G 4 10 CDS803-10kW(IP20) 4 10 VZH044-G 4 10 CDS303-7.5kW(IP20) 4 10 VZH028-H 6 10

CDS303-11kW(IP20) 4 10 VZH035-H 6 10 CDS303-11kW(IP20) 4 10 VZH044-H 6 10

Wiring & EMC protection The motor compressor power supply from

the CDS803/303 frequency converter to the VZH compressor must be done with a braided screened/shielded cable. This cable needs to have its screen/shielding conduit connected to earth on both ends. Avoid terminating this cable connection with twisting ends (pigtails) because that would result in an antenna phenomenon and decrease the eﬀectiveness of the cable.

Control cables to the CDS803/303 frequency converter must use the same installation principles as the motor power supply cable.

The motor compressor cable must be installed in a conduit separated from the control and mains cables.

Physical installation of the frequency converter on the mounting plate must ensure good electrical contact between the mounting plate and the metal chassis of the converter. Use starwashers and galvanically conductive installation plates to secure good electrical connections. Refer to instructions MG18N202/MG34M402 for tightening torques and screw sizes.

Note that the CDS803/303 must be mounted on a plain wall to ensure a good air ﬂow through its heat exchanger.

21AB225886435375en-001201

Application Guidelines

Electrical data, connections and wiring

EMC correct installation of an IP20 frequency drive CDS803

EMC qualiﬁcation reports are available upon request to Danfoss technical support.

Single compressors

Wiring diagram of CDS803

3 Phase power input

PLC etc.

PLC

Mains-supply

L1 L2 L3 PE

Reinforced protective earth

L1 L2 L3

Min. 16 mm

Equalizing cable

Control cables

Min. 200 mm between control cable, mains cable and between mains motor cable

Panel

Com.

Warn. Alarm

StatusQuick

Main

Auto

Hand

Reset

Output contactor etc.

Earthing rail

Cable insulation stripped

All cable entries in one side of panel

Motor cable

Motor, 3 phases and Protective earth

U V

Motor

22 AB225886435375en-001201

+10 V DC

0-10 V DC0/4-20 mA

50 (+10 V OUT)

53 (A IN)

54 (A IN)

55 (COM A IN/OUT)

42 0/4-20 mA A OUT / DIG OUT

45 0/4-20 mA A OUT / DIG OUT

12 (+24 V OUT)

18 (DIGI IN)

19 (DIGI IN)

20 (COM D IN)

27 (DIGI IN)

29 (DIGI IN)

24 V (NPN) O V (PNP)

Bus ter.

1 2

Bus ter.

RS-485 Interface

ON=Terminated

OFF=Unterminated

(Com RS-485 ) 61

UDC-

UDC+

relay2

relay1

(N RS-485) 69

(P RS-485) 68

Not present on all power sizes

240 V AC 3 A

RS-485

Do not connect shield to 61

(PNP)-Source (NPN)-Sink

RELAY

CDS803

Application Guidelines

Electrical data, connections and wiring

Wiring connections of CDS803

L1 91 L1 U 96 T1/U

L2 92 L2 V 97 T2/V

L3 93 L3 W 98 T3/W

95 PE PE 99

45 0/4-20 mA A OUT / DIG OUT

42 0/4-20 mA A OUT / DIG OUT

50 +10 V OUT NC

53 A IN NO 02

54 A IN COM 01

55 COM A IN/OUT

12 +24 V OUT CO M 04

18 DIGI IN

19 DIGI IN

27 DIGI IN

29 DIGI IN

20 COM D IN

N RS-485 69

P RS-485 68

Com RS-485 61

RELAY

NC 06

NO 05

Single compressors

Legends: A: Analog DIGI: Digital IN: Input OUT: Output COM: Common NC: Normally-closed NO: Normally-open

Open loop Process loop

91,92,93 3 phases mains input x x

95 Earth x x

42,45

0/4-20 mA Analague Output or Digital Output

- -

50 +10V DC Output - 53 0-10V or 4-20mA Analague Input x 54 0-10V or 4-20mA Analague Input - x 55 Com Analague In/Out x 12 +24V output - 18 External On/Oﬀ(NO) x x 19 Digital Input - 27 Safety Device e.g.: HP/LP switch x x 29 Digital Input - 20 Com Digital Input - 98 To Compressor T3 x x 97 To Compressor T2 x x 96 To Compressor T1 x x 99 Earth x x

03,02,01 Relay 1 - -

06,05,04 Relay 2 - -

69,68 RS485 Bus - -

61 RS485 Bus Com - -

-: Optional connection X: Mandatory connection

The CDS803 frequency converter is factory preset with parameters for the open loop control principle. The process loop control principle can be selected by changing parameters in the “Quick menu.” Open loop: preset on input 53 0 - 10 V control Frequency converter in slave mode Process loop: preset on input 54 4 - 20 mA control Frequency converter under own PID controller

23AB225886435375en-001201

Application Guidelines

Electrical data, connections and wiring

EMC correct installation of an IP20 frequency drive CDS303

EMC qualiﬁcation reports are available upon request to Danfoss technical support.

PLC etc. Panel

PLC

Min. 0.025 in ² (16 mm²) Equalizing cable

Control cables

Single compressors

Grounding rail

Cable insulation stripped

All cable entries in one side of panel

Wiring diagram of CDS303

Mains supply L1

L2 L3 PE

Reinforced protective ground

3 Phase power

input

DC bus

+10Vdc

-10Vdc +10Vdc

0/4-20 mA

-10Vdc +10Vdc 0/4-20 mA

91 (L1) 92 (L2) 93 (L3)

88 (-)

89 (+)

50 (+10 V OUT)

53 (A IN)

54 (A IN)

55 (COM A IN)

12 (+24V OUT)

13 (+24V OUT)

18 (D IN)

19 (D IN)

(COM D IN)

(D IN/OUT)

32 (D IN)

33 (D IN)

37 (D IN)

Min. 7.9 in (200 mm) between control cables, motor cable and mains cable

S201

1 2

ON/I=0-20mA

S202

OFF/U=0-10V

24V

Switch Mode

Power Supply

10Vdc

15mA 130/200mA

+ - + -

P 5-00

24V (NPN) 0V (PNP)

24Vdc

S801

RS-485

Interface

Motor cable

Motor, 3 phases and protective ground

(W) 98

(PE) 99

(R+) 82

(R-) 81

relay1

relay2

(COM A OUT) 39

(A OUT) 42

ON=Terminated

OFF=Open

S801

(P RS-485) 68

(N RS-485) 69

(COM RS-485) 61

(U) 96

(V) 97

Brake resistor

240Vac, 2A

400Vac, 2A

Analog Output

0/4-20 mA

(PNP) = Source (NPN) = Sink

130BA025.17

RS-485

24 AB225886435375en-001201

RELAY

CDS303

Application Guidelines

Electrical data, connections and wiring

Wiring connections of CDS303

L1 91 L1 U 96 T1/U

L2 92 L2 V 97 T2/V

L3 93 L3 W 98 T3/W

95 PE PE 99

39 Ana out COM

42 Ana out +

50 Ana out +10 V NC

53 Ana in 0 ± 10 V NO 02

54 Ana in 0 ± 10 V COM 01

55 Ana in COM

12 +24V COM 04

13 +24V

18 Dig in

19 Dig in

27 Dig in/out

29 Dig in/out

32 Dig in N- RS485 69

33 Dig in P+ RS485 68

20 Dig in COM COM RS485 61

37 Dig in

RELAY

NC 06

NO 05

230V or 24V

～

2 A max

Single compressors

Legends: Ana: Analogue Dig: Digital in: Input out: Output COM: Common NC: Normally-closed NO: Normally-open

Open loop Process loop

91, 92, 93 3 Phase mains input X X

95 Earth X X

39, 42 Analogue output - -

50 Analogue output - 53 PLC+ (0 to 10 V) X 54 Sensor - - X 55 PLC- X 12 HP/LP switch X X 12 External On/Oﬀ (NO) X X 13 Factory bridged to 37 X X 13 Sensor + - X 18 External On/Oﬀ (NO) X X 19 Digital input - 27 LP switch (NC) / safety devices X X 29 Digital input/output - -

32, 33 Digital input - -

20 Digital input Common - 37 Factory bridged to 13 / HP switch X X 98 To compressor terminal T3 X X 97 To compressor terminal T2 X X 96 To compressor terminal T1 X X 99 To compressor earth connection X X

02, 01 Relay 1 to oil solenoid valve X X

06, 05, 04 Relay 2 - -

69, 68 RS485 Bus - -

61 RS485 Bus Common - -

-: Optional connection X: Mandatory connection

Electrical connections

VZH028/035/044 scroll compressors are designed to operate without any assistance.

The CDS303 frequency converter is factory preset with parameters for the open loop control principle. The process loop control principle can be selected by changing parameters in the «Quick menu». Open loop: preset on input 53 0 - 10 V control Frequency converter in slave mode Process loop: preset on input 54 4 - 20 mA control Frequency converter under own PID controller

T37 is CE and UL approved for STO, Safety Torque Function

25AB225886435375en-001201

Application Guidelines

Electrical data, connections and wiring

Single compressors

Soft-start control

Phase sequency and reverse rotation protection

IP rating

The CDS803/CDS303 frequency converter generates by design a compressor soft start with an default initial ramp up of 7.5s to 50 rps.

Basically seen from the mains the inrush peak reach a level which is only a few percent more than the rated nominal current.

Current inrush will not exceed the frequency converter maximum current.

The compressor will only operate properly in a single direction. If electrical connections are done correctly between the drive and the compressor terminals (compressor and drive terminals U, V & W matching), the drive will provide correct phase supply to the compressor, and reverse rotation will be not possible:

discharge, and suction line warming rather than immediate cooling. The compressor can be rapidly damaged in these conditions. To protect compressors from reverse rotation, one of below actions is required:

- Use pressure sensors to monitor pressure diﬀerence between discharge and suction of the compressor, and for normal operation,

• CDS terminal U (96) to VZH terminal T1/U

• CDS terminal V (97) to VZH terminal T2/V

• CDS terminal W (98) to VZH terminal T3/W

If compressor and drive U, V & W terminals are not matching, the compressor can operate in a reverse rotation. This results in excessive noise, no pressure diﬀerential between suction and

discharge pressure should be at least 1 bar higher than suction pressure within 30 s running after compressor starting.

Mains connection to the CDS frequency converter order has no inﬂuence on the output phase sequence which is managed by the frequency converter.

The compressor terminal box IP rating according to IEC529 is IP22.

Motor protection

Element Numerals or letters Meaning for the protection of equipment

Against ingress of solid foreign objects

First characteristic

numeral

Second

characteristic

numeral

1 2 3 4 5 6

0 1 2 3 4 5 6 7 8

VZH scroll compressors are not equipped with an internal motor protector. Motor protection is provided by the variable speed drive. All parameters are factory preset in order to guaranty locked rotor or overload current

(non protected) ≥ 50 mm diameter ≥ 12.6 mm diameter ≥ 2.5 mm diameter ≥ 1.0 mm diameter dust protected dust tight

Agains ingress of water with harmful effects

(non protected vertically dripping dripping (15° tilted) spaying splashing jetting powerful jetting temporary immersion continuous immersion

When a warning situation is reached in the current control, the CDS frequency converter will automatically reduce the compressor speed in order to keep the motor current of the compressor below the maximum allowed.

protection.

Anti-reverse protection

26 AB225886435375en-001201

In some cases when compressors stop under low mass ﬂow low speed condition, discharge valve may not seal discharge port fast enough, thus compressors may run in a reverse rotation due to the residual pressure diﬀerence and generate a big noise. Running in the wrong direction will reduce the reliability and lifetime

of the compressor. The drive shall prevent the compressors scroll set from running the wrong way during stop with anti reverse protection.

To activate the function, the customer must be able to enable and disable the ANTI-REVERSE PROTECTION.

Application Guidelines

Electrical data, connections and wiring

Single compressors

Temperature protection

Voltage imbalance

If the temperature in the drive is too high, an alarm (CDS303: Alarm 29, Heatsink Temp. CDS803: Alarm 69, Pwr. Card Temp) will be seen to trip the drive. When the drive shows this alarm, it’s suggested that OEM controller has to

The maximum allowable voltage imbalance between each phase is 3%. Voltage imbalance causes high amperage over one or several phases, which in turn leads to overheating and possible drive damage.

Mains imbalance function in CDS frequency converter can be set to “[0] Trip” or “[1] Warning”

be programmed based on the reading of the heatsink temperature received from the drive to lower the load to avoid a trip-lock. Contact Danfoss for more details.

in 14.12 parameter. It is, by default, factory preset to “[1] Warning”.

Then the compressor electrical motor is never aﬀected by main voltage imbalance situations which are made completely transparent by the frequency converter.

27AB225886435375en-001201

Application Guidelines

certiﬁcates

Approvals and certiﬁcates

VZH compressors comply with the following approvals and certiﬁcates.Approvals and

(European Directive) UL

(Underwriters Laboratories)

EMC

2014/30/EU

CCC VZH code G

All VZH models

VZH code G & code J

Single compressors

Low voltage directive 2014/35/EU

Internal free volume

Products VZH028-035- 044

Declaration of conformity ref. Low voltage directive 2014/35/EU

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

VZH028 3.2

VZH035 3.2

VZH044 3.2

Contact Danfoss

28 AB225886435375en-001201

Application Guidelines

Operating conditions

Single compressors

Application envelopes

The operating envelopes for VZH scroll compressors are given in the ﬁgures below, where the condensing and evaporating temperatures represent the range for steady state operation. Under transient conditions, such as start-up and defrost, the compressor may operate outside this envelope for short periods. The ﬁgures below show the operating envelopes for VZH compressors with refrigerants R410A. Due to bearing loads and scroll stability, there will be speed restrictions on the envelops. The operating limits serve to deﬁne the envelope within which reliable operation of the compressor is guaranteed:

• Maximum discharge gas temperature: +135°C.

• Minimum suction superheat should be above 5 K and minimum sump superheat should refer to the “oﬀ-cycle migration” chapter due to the risk of liquid ﬂood back.

• Attention to suction line insulation to reduce useless superheat.

• Minimum and maximum evaporating and condensing temperatures as per the operating envelopes.

• VZH drive can only protect the compressor from over current. Customers need to have a high pressure, low pressure sensor and discharge temperature thermostat to fully protect the envelop. Since out of map running will threaten the reliability of compressor, customers must qualify map protection under all extreme conditions.

29AB225886435375en-001201

Application Guidelines

Application envelopes for index B

Single compressors

VZH59F Map with R410A (SH 6 K)

Condensing temperature (°C)

-35 -25 -15 -5 5 15 25-30 -20 -10 0 10 20 30

°C

60-100rps

30-100rps 20-100rps

Evaporating temperature (°C)

40-100rps

15-100rps

Voltage:400-460V/208-230V/525-600V

40-100rps

Short cycle timer function

VZH59F Map with R410A (SH 6 K)

Condensing temperature (°C)

-35 -25 -15 -5 5 15 25-30 -20 -10 0 10 20 30

°C

60-100rps

60-95rps

40-100rps

30-100rps

Evaporating temperature (°C)

Short cycle control is provided directly by the CDS frequency converter, when parameter 28-00 is enabled. The function is factory set to enabled, with minimum running time to 60 seconds and the interval between starts to 300 seconds.

Voltage:380V

40-95rps

20-100rps

40-100rps

15-100rps

Short cycle settings are accessible in the parameter 28.0x list, in the “compressor functions” menu. If system is fully controlled by an external main controller, it is recommended to limit the start/ stop frequency to 12 times per hour.

30 AB225886435375en-001201

Application Guidelines

Operating conditions

Single compressors

Discharge gas thermostat Discharge gas temperature (DGT) protection

is required if the high and low pressure switch settings do not protect the compressor against operations beyond its speciﬁc application envelope. Please refer to the examples below,

Condensing temperature (°C)

-35 -30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 35

Example 1 (R410A, SH = 6 K) LP switch setting: LP1 = 3.3 bar (g) (-15.5°C) HP switch setting: HP1 = 38 bar (g) (62°C) Risk of operation beyond the application envelope. DGT protection required.

DGT limit

LP1 LP2

Evaporating temperature (°C)

which illustrate where DGT protection is required (Ex. 1) and where it is not (Ex. 2). Please notice the envelope boundaries change based on diﬀerent speed limits.

HP1

Example 1

HP2

Example 2

R410A

Example 2 (R410A, SH = 6 K) LP switch setting: LP2 = 4.6 bar (g) (-10.5°C) HP switch setting: HP2 = 31 bar (g) (52°C) No risk of operation beyond the application envelope. No DGT protection required.

The discharge gas temperature must not exceed 135°C.

A discharge gas temperature protection device must be installed on all heat pumps. In reversible air-to-air and air-to-water heat pumps, the discharge temperature must be monitored during development test by the equipment manufacturer.

The compressor must not be allowed to cycle on the discharge gas thermostat. Continuous operations beyond the compressor’s operating range will cause serious damage to the compressor.

VZH028-044 can install a discharge sensor/ dome sensor at the top of shell through a bracket and the sensor has to been connected and

controlled by OEM controller. By installing it at the top of shell, the discharge sensor can monitor discharge temperature and work with OEM controller to limit discharge temperature within 135°C. A customer might select NTC thermistor, 10KOhm@25°C type from “TOD Company” and this type of sensor could be ﬁt into VZH top shell directly. The thermostat could also be attached to the discharge line within 150 mm from the compressor discharge port and must be thermally insulated and tightly ﬁxed to the pipe.

Bracket at the shell top

This side up

31AB225886435375en-001201

Application Guidelines

Operating conditions

Single compressors

Oil return management function (single compressor)

An insuﬃcient oil level can be the result of oil depositing itself in pipes and heat exchangers or low velocity of compressors. The oil return management could be achieved by increasing velocity for short periods, at regular time intervals.

CDS integrates oil return management function together with compressor internal lubrication protection.

Internal lubrication protection: If compressor runs below 40 rps (ORM Min Speed Limit, 28-15) for more than 120 minutes (low speed running time, 28-11), then CDS internal lubrication function will accelerate compressor speed to 60 rps (minimum ORM Boost Speed, 28-17) for 1 minute (minimum duration, includes ramp up time, 28-13) to guarantee compressor inner parts get lubricated. In case slow acceleration condition, please make sure compressor maintain minimum speed 40 rps (80Hz) for at least 1 minute running.

ID Name Factory setup Unit

2810 Oil return management ON 2811 Low speed running time 12 0 min 2812 Fixed boost interval 24 h 2813 Boost duration 60 s 2815 ORM min speed limit 80 Hz 2817 ORM boost speed (Hz) 120 Hz

Oil return function: To double ensure well lubrication, compressor speed will boost to 60 rps (minimum ORM Boost Speed, 28-17) at a ﬁxed time intervals (as programmed in parameter 2812, default 24 hrs) any way. OEM could set 28-17 to a higher speed, such as 70 rps to secure oil management

According to diﬀerent application requirements, OEM can either add oil separator (including to add more oil in the system) or adjust oil return parameters or might need both actions to keep oil safety for compressor.

Oil management related parameters, 28-11, 28-12, 28-13,28-15 (CDS303 only), 28-17 (CDS303 only) could also be programmed by OEM.

Considering oil return risk, a split system with more than 10 m piping length requires mandatory application approval by Danfoss application specialists.

High and low pressure protection

High pressure According to EN378-2, a high-pressure (HP) safety

switch is required to shut down the compressor. The high-pressure switch can be set to lower values depending on the application and ambient conditions. The HP switch must either be placed in a lockout circuit or consist of a manual reset device to prevent cycling around the highpressure limit. If a discharge valve is used, the HP switch must be connected to the service valve gauge port, which must not be isolated. The HP switch can be connected to the CDS803 input 27/ CDS303 input 37 or an external contactor which could be set before or after the drive.

Please note port 27 of CDS803 is not UL certiﬁcated and when connected with high pressure switch, no delay is permitted. OEM need to set port 27 to “coast reverse/coast and reset inverse” to get rid of minimum running time restriction.

For CDS303, port 37 is CE and UL approved for safety torque function.

If the contactor is placed between the drive and compressor, to make sure a proper start up, the contactor must be power on ahead of the drive gets fed at least 3 seconds earlier.

When the contactor acts as a high pressure switch, it has to be normally close switch. The contactor will only open when high pressure triggers or power oﬀ.

In case of HP cut out, the output contactor will open while compressor is running, thus a Motor Phase Loss alarm will occur.

32 AB225886435375en-001201

Application Guidelines

Operating conditions

Single compressors

Low pressure

Pressure settings

A low-pressure (LP) safety switch must be used. Deep vacuum operations of a scroll compressor can cause internal electrical arcing and scroll instability. VZH compressors exhibit high volumetric eﬃciency and may draw very low vacuum levels, which could induce such a problem. The minimum low-pressure safety switch (loss-of-charge safety switch) setting is given in the following table. For systems without pump-down, the LP safety switch must either be a manual lockout device or an automatic switch wired into an electrical lockout circuit. The LP

operations of the compressor. LP switch settings for pump-down cycles with automatic reset are also listed in the table below. The lock-out circuit or LP switch or series with other safety devices could be connected to CDS803/CDS303 input 27. The low pressure switch must have the highest priority that shall not be by passed. It means when low pressure switch is activated, compressor minimum running time should not work. OEM need to set port 27 to “coast reverse/ coast and reset inverse” to get rid of minimum running time restriction.

switch tolerance must not allow for vacuum

Pressure settings R410A

Working pressure range high side bar (g) 8.3 - 41.1 bar

Working pressure range low side bar (g) 1.5-13.9 bar / 1.5-16.6 bar***

Maximum high pressure safety switch setting bar (g) 43.75

Minimum low pressure safety switch setting * bar (g) 1.0

Minimum low pressure pump-down switch setting ** bar (g) 1.18

* LP safety switch shall never be bypassed. ** Recommended pump-down switch settings: 2.2 bar below nominal evaporating temperature with minimum of 1.18 ***Only for index B

Electronic expansion valve

Crankcase heating function

With variable capacity systems, an electronic expansion valve (EXV) is the strongly recommended solution to handle refrigerant mass ﬂow variations. Danfoss recommends the use of ETS products. Ramp-up and ramp-down settings, of both EXV and compressor, must be done with great care.

Ramp-up of the EXV must be shorter than the ramp-up of the compressor, to avoid any low pressure operation on suction side of the

There is no crankcase heating function in CDS drives for VZH028-035-044. An external crankcase

compressor. The EXV can also be opened, up to a certain degree, before the start up of the compressor.

Ramp-down of the EXV must be longer than the ramp-down of the compressor, also to avoid low pressure operation (except with pump-down).

EXV should be closed, and remain closed, when the compressor is oﬀ, to avoid any liquid refrigerant entering the compressor.

heater is required. Refer to accessory list for code numbers.

33AB225886435375en-001201

Application Guidelines

System design recommendations

Single compressors

Essential piping design considerations

The working pressure in systems with R410A is about 60% higher than in systems with R22 or R407C. Consequently, all system components and piping must be designed for this higher pressure level. Proper piping practices should be employed to ensure adequate oil return, even under minimum load conditions with special consideration given to the size and slope of the tubing coming from the evaporator. Tubing returns from the evaporator should be designed so as not to trap oil and to prevent oil and refrigerant migration back to the compressor during oﬀ-cycles. In systems with R410A, the refrigerant mass ﬂow will be lower compared to R22/R407C systems. To maintain acceptable pressure drops and acceptable minimum gas velocities,

Piping should be designed with adequate three-dimensional ﬂexibility. It should not be in contact with the surrounding structure, unless a proper tubing mount has been installed. This protection proves necessary to avoid excess vibration, which can ultimately result in connection or tube failure due to fatigue or wear

the refrigerant piping must be reduced in size compared to R22 / R407C systems. Take care also to not create overly high pressure drops as in R410A systems the negative impact of high pressure drops on the system eﬃciency is stronger than in R22/R407C systems. The design in this guideline is for short circuit application. However, for long circuit and split system application, an oil separator and an external non-return valve are recommended for use based on system qualiﬁcation status. CDS frequency converter integrates a special feature in the compressor functions in order to improve and secure the oil recovery from the system. Refer to “Oil Return Management” section.

from abrasion. Aside from tubing and connection damage, excess vibration may also transmitted to the surrounding structure and generate an unacceptable noise level within that structure. For more information on noise and vibration, see “Sound and Vibration Management” section.

Suction lines

Discharge lines

If the evaporator lies above the compressor, as is often the case in split or remote condenser systems, the addition of a pump-down cycle is strongly recommended. If a pump-down cycle were to be omitted, the suction line must have a loop at the evaporator outlet to prevent refrigerant from draining into the compressor during oﬀ-cycles. If the evaporator were situated below the compressor, the suction riser must be trapped so as to prevent liquid refrigerant from collecting at the outlet of the evaporator while the system is idle, which would mislead the expansion valve’s sensor (thermal bulb) at start-up.

When the condenser is mounted at a higher position than the compressor, a suitably sized U-shaped trap close to the compressor is necessary to prevent oil leaving the compressor from draining back to the discharge side of the compressor during oﬀ cycle. The upper loop also helps avoid condensed liquid refrigerant from draining back to the compressor when stopped. For inverter applications with long lines we recommend the use of an oil separator even if it is only the condenser which is far away from the unit. Piping must also be designed with care in order to make sure the remaining oil not trapped by the oil separator is properly carried over the system. Basic principal is shown here. Note that for the discharge line, following the same principle as for the suction line with a U-trap every 4 m

To condenser

U-trap

0.5% slope

4 m/s or more

max. 4 m

U-trap, as short as possible

8 to 12 m/s

max. 4 m

0.5% slope

4m/s or more

U trap, as short as possible

Evaporator

must be applied between discharge U-trap and upper U-trap where the condenser is above the compressor unit. We also recommend installing one check valve on the discharge line to the condenser next to the condenser to avoid the possibility of having the discharge tube full of liquid during oﬀ cycles; discharge lines ﬂooded by liquid which may create start-up issues by drive over-torque or HP switch trip.

Upper loop

U Trap

3D exibility

Condenser

34 AB225886435375en-001201

Application Guidelines

System design recommendations

Single compressors

Oil management

Especially for split systems using variable speed compressor, in which every installation is unique and qualiﬁcation of individual installations is not practical, Danfoss requires that OEMs install an oil separator (OS).

The requirement of an oil separator is also suitable for any other system with complex piping (long line set, U trap), multiple heat exchangers and elevation changes.

Many oil separator designs exist, the selection, requirements and recommendations of the oil Separator manufacturer should be followed.

Please note that Oil Separators are not 100% eﬃcient and the OS eﬃciency will vary with diﬀerent compressor running speeds. Customers should select the OS at the normal operating point at low speed.

When oil separators are installed, OEM customers need to evaluate the system performance eﬃciency at key rating speeds to consider the ﬂow loss impact with the selected OS.

Danfoss recommends customers to use cyclonic oil separators. The following principles are recommended:

- OEM should select a common low speed running point to evaluate OS max eﬃciency.

- Qualify oil management reliability at maximum

and minimum mass ﬂow conditions in the operating envelope with the OS selected

- Evaluate system eﬃciency at all rating conditions

to consider ﬂow loss impact from the OS

For VZH028-035-044, the Schrader valve connection is close to the internal oil pump. To avoid reliability risks, please connect the OS to the compressor suction tube. Never return oil to the Schrader valve in order to avoid a potential negative impact on reliability, such as oil turbulence to the oil pump, etc..

For an illustration for OS connections to the compressor, please refer as below:

Check valve

Oil separator

Capillary

Strainer

Solenoid valve

35AB225886435375en-001201

Application Guidelines

System design recommendations

Single compressors

Heat exchangers

Refrigerant charge limits

To obtain optimum eﬃciency of the complete refrigerant system, optimized R410A heat exchangers must be used. R410A refrigerant has good heat transfer properties: it is worthwhile designing speciﬁc heat exchangers to gain in size and eﬃciency.

An evaporator with an optimized R410A distributor and circuit will give correct superheat at outlet and optimal use of the exchange surface. This is critical for plate evaporators that generally have a shorter circuit and a lower volume than shell & tubes and air cooled coils.

For all evaporator types, special care is required for superheat control leaving the evaporator and oil return.

VZH compressors can tolerate liquid refrigerant up to a certain extend without major problems. However, excessive liquid refrigerant in the compressor is always unfavorable for service life. Besides, the installation cooling capacity may be reduced because of the evaporation taking place in the compressor and/or the suction line instead of the evaporator. System design must be such that the amount of liquid refrigerant in the compressor is limited. In this respect, follow the guidelines given in the section: “Essential piping design recommendations” as a priority.

A sub-cooler circuit in the condenser that creates high sub-cooling will increase eﬃciency at high condensing pressure. In R410A systems the positive eﬀect of sub-cooling on system eﬃciency will be signiﬁcantly larger than in R22/ R407C systems.

Furthermore, for good operation of the expansion device and to maintain good eﬃciency in the evaporator it is important to have an adequate liquid sub-cooling. Without adequate sub-cooling, ﬂash gas will be formed at the expansion device resulting in a high degree of vapor at the evaporator inlet leading to low eﬃciency.

If the refrigerant charge exceeds the values in table below, a suction line accumulator is strongly recommended.

Model Refrigerant charge limit (kg)

VZH028-044 3.6

More detailed information can be found in the paragraphs hereafter. Please contact Danfoss technical support for any deviation from these guidelines.

Oﬀ-cycle migration Liquid refrigerant can ﬁnd its way into the

compressor by means of oﬀ-cycle migration or liquid ﬂoodback during operation.

Oﬀ-cycle refrigerant migration is likely to occur when the compressor is located at the coldest part of the installation, when the system uses a bleed-type expansion device, or if liquid is allowed to migrate from the evaporator into the compressor sump by gravity. If too much liquid refrigerant accumulates in the sump it will saturate the oil and lead to a ﬂooded start: when the compressor starts running again, the refrigerant evaporates abruptly under the sudden decrease of the bottom shell pressure, causing the oil to foam. In extreme situations, this might result in liquid slugging (liquid entering the scroll

elements), which must be avoided as it causes irreversible damage to the compressor.

The presence of liquid in the crankcase can be easily detected by checking the sump level through the oil sight glass. Foam in the oil sump indicates a ﬂooded start.

VZH scroll compressors can tolerate occasional ﬂooded starts as long as the total system charge does not exceed the maximum compressor refrigerant charge limit.

Oﬀ-cycle migration can be prevented by implementing a crankcase heating or adding a pump-down cycle to the operation cycle and a liquid line solenoid valve.

36 AB225886435375en-001201

Application Guidelines

System design recommendations

Single compressors

Crankcase heater / sump heater: A crankcase heater is only eﬀective if capable of sustaining this level of temperature diﬀerence. Tests must be conducted to ensure that the appropriate oil temperature is maintained under all ambient conditions (temperature and wind).

Liquid line solenoid valve (LLSV): An LLSV may be used to isolate the liquid charge on the condenser side, thereby preventing against charge transfer or excessive migration to the compressor during oﬀ-cycles. When installed,

Pump-down cycle: A pump-down cycle represents one of the most eﬀective ways to protect against the oﬀ-cycle migration of liquid refrigerant. Once the system has reached its set point and is about to shut oﬀ, the LLSV on the condenser outlet closes. The compressor then pumps the majority of the refrigerant charge into the condenser and receiver before the system stops on the low pressure pump-down switch. This step reduces the amount of charge on the

Provide separate electrical supply for the heaters so that they remain energized even when the machine is out of service (eg. seasonal shut-down).

It’s recommended that the heater be turned on for a minimum of 8 hours prior to starting the compressor.

EXV also ensures this function. 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.

low side in order to prevent oﬀ-cycle migration. The recommended low-pressure pump-down switch setting is 1.5 bar below the nominal evaporating pressure. It shall not be set lower than 2.3 bar.

An external non return valve is recommended to avoid liquid ﬂood back from the high-pressure side.

Liquid ﬂoodback during operation

Liquid receiver: Refrigerant charge optimization

varies with compressor speed. To avoid ﬂash gas at low speed, a receiver may be necessary. Receiver dimensioning requires special attention.

Danfoss recommends the use of an electronic expansion valve for all air conditioning applications with VZH028-044 compressors. An EXV has two key beneﬁts: it provides modulating control of the system under varying load

The receiver shall be large enough to contain part of the system refrigerant charge, but shall not be too large, to avoid refrigerant overcharging during maintenance operations.

conditions, and it protects the compressors from ﬂood back during adverse running conditions. Exceptions to the use of EXV’s with Danfoss variable speed compressors must be approved by Danfoss application engineering.

37AB225886435375en-001201

Application Guidelines

System design recommendations

Single compressors

Manage superheat During normal operation, refrigerant enters

the compressor as a superheated vapor. Liquid ﬂood back occurs when a part of the refrigerant

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

entering the compressor is still in liquid state.

Requirement

In steady state conditions the expansion device must ensure a suction superheat within 5K to 30K (9 to 54°F).

System evaluation

Use the table in relation with the application to quickly evaluate the potential tests to perform.

Application Tests to perform

Non reversible Liquid ﬂood back test

Reversible

Liquid ﬂood back test

Test, criteria and solutions

Test N ° Purpose Test condition Pass criteria Solutions

Liquid ﬂood back testing must be carried out under expansion valve threshold operating conditions:

•Lowest foreseeable evaporation, and highest foreseeable condensation.

•Minimum speed running.

Liquid ﬂood back test

Steady-state

For reversible system, perform test in both heating and cooling mode

Suction superheat >5K

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*.

Defrost test

Tests must be carried out with most

Transient

Check liquid

Defrost test

*Suction accumulator oﬀers 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”.

ﬂoodback during defrost cycle

unfavorable conditions :

• fan staging,

• compressor staging

• …

Defrost test must be carried out in the most unfavorable condition at 0°C (32°F) evaporating temperature).

Oil superheat shall not be more than 30 sec below the safe limit deﬁned in the Dilution Chart. (see graph above)

Oil superheat shall not be more than 30 sec below the safe limit deﬁned in the Dilution Chart. (see graph ablve)

1.Check defrost logic.

In reversible systems, the defrost logic can be worked out to limit liquid ﬂoodback eﬀect. (for more details see “Control Logic”).

2. Add a suction accumulator*.

38 AB225886435375en-001201

System design recommendationsApplication Guidelines

Dilution chart

(reference at 20°C / 68°F ambient temperature)

-25.6 -13 -4 514230 32 50 59

Oil Superheat (K)

-32 -25 -20 -15 -10 -5 0510 15 20 25

Oil temperature sensor must be placed between oil sight glass and compressor baseplate. Some thermal paste shall be used to improve the conductivity. The sensor must also be correctly thermally insulated from the ambiance.

Evaporating Temperature °F

Unacceptable

Evaporating Temperature °C

Acceptable

68 772780.6

Single compressors

Oil Superheat (°F)

The Oil superheat is deﬁned as: (Oil temperature - Evaporating temperature)

39AB225886435375en-001201

Application Guidelines

Low ambient compressor operations

Speciﬁc application recommendations

Single compressors

Low ambient start-up

Head pressure control under low ambient conditions

Under cold ambient conditions, upon start-up the pressure in the condenser may be so low that a suﬃcient pressure diﬀerential across the expansion device cannot be developed to properly feed the evaporator. As a result, the compressor may go into abnormal low suction pressure, which can lead to compressor failure. Under no circumstances should the compressor be allowed to operate under vacuum. The lowpressure control must be set in accordance with

Several possible solutions are available to prevent the compressor from drawing down to a vacuum upon start-up under low ambient conditions. In air-cooled machines, cycling the fans with a head pressure controller will ensure that the fans remain oﬀ until the condensing pressure has reached a satisfactory level. In water-cooled units, the same can be performed using a water regulator valve that is also operated by head pressure, thereby ensuring that the water valve does not open until the condensing pressure reaches a satisfactory level.

Note: The minimum condensing pressure must be set at the minimum saturated condensing temperature shown in the application envelopes.

the table section “Pressure settings” in order to prevent this from happening.

Low pressure diﬀerentials can also cause the expansion device to “hunt” erratically, which might cause surging conditions within the evaporator, with liquid spillover into the compressor. This eﬀect is most pronounced during low load conditions, which frequently occur during low ambient conditions.

Under very low ambient conditions, in which testing has revealed that the above procedures might not ensure satisfactory condensing and suction pressures, the use of a liquid receiver with condenser and receiver pressure regulators would be possible.

Condensing pressure control is also strongly recommended to improve any system eﬃciency. The most accurate value is to control the condensing temperature at 12 K above the ambient temperature for air cooled condensers.

For further information, please contact Danfoss Technical support.

Crankcase heaters

Low load operations It is recommended that the unit is tested and

A crankcase heating will minimize refrigerant migration caused by the large temperature gradient between the compressor and the remainder of the system.

monitored at minimum load and, if possible, during low ambient conditions as well. During conditions of low load on the system, the following considerations should be taken into account to ensure proper system operating characteristics.

Belt type crankcase heaters can be used, see section "Accessory". They can be connected to CDS relay 1 or 2.

• The superheat setting of the expansion device should be suﬃcient to ensure proper superheat levels during low loading periods. 6 K stable superheat is required. In addition, the refrigerant charge should be suﬃcient to ensure proper sub-cooling within the condenser so as to avoid the risk of ﬂashing in the liquid line before the expansion device. The expansion device should be sized to ensure proper control of the refrigerant ﬂow into the evaporator.

40 AB225886435375en-001201

Application Guidelines

Speciﬁc application recommendations

Single compressors

Brazed plate heat exchangers

An oversized valve may result in erratic control. This can lead to liquid refrigerant entering the compressor if the expansion valve does not provide stable refrigerant super-heat control under varying loads.

• Condenser fans should be cycled in such a way that the minimum pressure diﬀerential is maintained between the suction and discharge pressures. Inverter fans can also be used to control the amount of heat to be removed from the condenser.

A brazed plate heat exchanger needs very little internal volume to satisfy the set of heat transfer requirements. Consequently, the heat exchanger oﬀers very little internal volume for the compressor to draw vapor from on the suction side. The compressor can then quickly enter into a vacuum condition. It is therefore important that the expansion device be sized correctly and that a suﬃcient pressure diﬀerential across the expansion device be available to ensure adequate refrigerant feed into the evaporator. This aspect is of special concern when operating the unit under low ambient and load conditions. For further information on these conditions, please refer to the previous sections.

• The compressors should be run for a minimum period in order to ensure that the oil has suﬃcient time to properly return to the compressor sump and that the motor has suﬃcient time to cool under conditions of lowest refrigerant mass ﬂows.

Refer to section “Oil return management function”.

The suction line running from the heat exchanger to the compressor must be trapped to avoid refrigerant migration to the compressor.

When using a brazed plate condenser heat exchanger, a suﬃcient free volume for the discharge gas to accumulate is required in order to avoid excess pressure build-up. At least 1 meter of discharge line is necessary to generate this volume. To help reduce the gas volume immediately after start-up even further, the supply of cooling water to the heat exchanger may be opened before the compressor starts up so as to remove superheat and condense the incoming discharge gas more quickly.

Reversible heat pump systems

Discharge temperature monitoring

Due to the small volume of the brazed plate heat exchanger, no pump-down cycle is normally required.

Transients are likely to occur in reversible heat pump systems, i.e. a changeover cycle from cooling to heating, defrost or low-load short cycles. These transient modes of operation may lead to liquid refrigerant carry-over (or ﬂood-back) or excessively wet refrigerant return conditions. As such, reversible cycle applications require speciﬁc precautions in order to ensure a long compressor life and satisfactory operational function. Compressors need to run at least

Heat pumps frequently utilize high condensing temperatures in order to achieve a suﬃcient temperature rise in the medium being heated. At the same time, they often require low evaporating pressures to obtain suﬃcient temperature diﬀerentials between the evaporator and the outside temperature. This situation may result in high discharge temperature; as such, it is mandatory that a discharge gas safety control is included to protect the compressor

Because of the large compressor capacity variation and VZH capability to run at low condensing temperature an EXV (electronic expansion valve) is mandatory.

1 minute at 50 rps each time after reverse. Regardless of the refrigerant charge in the system, speciﬁc tests for repetitive ﬂood-back are required to conﬁrm whether or not a suction accumulator needs to be installed. The following considerations cover the most important issues when dealing with common applications. Each application design however should be thoroughly tested to ensure acceptable operating characteristics.

from excessive temperatures. Operating the compressor at too high discharge temperatures can result in mechanical damage to the compressor as well as thermal degradation of the compressor lubricating oil and a lack of suﬃcient lubrication.

Refer to the “Discharge gas thermostat” section for frequency converter settings and accessories availability.

41AB225886435375en-001201

Application Guidelines

Speciﬁc application recommendations

Single compressors

Discharge line and reversing valve

Defrost and reverse cycle

Suction line accumulator

The VZH scroll compressor is a high volumetric machine and, as such, can rapidly build up pressure in the discharge line if gas in the line becomes obstructed even for a very short period of time which situation may occur with slowacting, reversing valves in heat pumps. Discharge pressures exceeding the operating envelope may result in nuisance high-pressure switch cutouts and can generate excessive load on bearings and motor.

To prevent such occurrences, it is important that a 1-meter minimum discharge line length be allowed between the compressor discharge port and the reversing valve or any other restriction. This gives suﬃcient free volume for the discharge

After the 4-way valve is moved to defrost position, and in order to shorten the defrost period, the compressor speed can be maintained at 70 rps or higher speed during the defrost period.

The use of a suction line accumulator is strongly recommended in reversible-cycle applications. This because of the possibility of a substantial quantity of liquid refrigerant remaining in the evaporator, which acts as a condenser during the heating cycle.

This liquid refrigerant can then return to the compressor, either ﬂooding the sump with refrigerant or as a dynamic liquid slug when

gas to collect and to reduce the pressure peak during the time it takes for the valve to change position. At the same time, it is important that the selection and sizing of the reversing or 4-way valve ensure that the valve switches quickly enough to prevent against too high discharge pressure and nuisance high-pressure cutouts.

Check with the valve manufacturer for optimal sizing and recommended mounting positions.

It is strongly recommended to reduce the compressor speed to 25/30 rps before the 4-way valve is moved from a position to another.

Refer also to high and low pressure protection.

When the compressor is started again each time, compressor will run at 50 rps for at least 1 minute. Thus to avoid excessive liquid refrigerant to come back to the compressor sump.

the cycle switches back to a defrost cycle or to normal cooling operations.

Sustained and repeated liquid slugging and ﬂoodback can seriously impair the oil’s ability to lubricate the compressor bearings. This situation can be observed in wet climates where it is necessary to frequently defrost the outdoor coil in an air source heat pump. In such cases a suction accumulator becomes mandatory.

Water utilizing systems

Apart from residual moisture in the system after commissioning, water could also enter the refrigeration circuit during operation. Water in the system should always be avoided. Not only because it can quickly lead to electrical failure, sludge in sump and corrosion but in particular because it can cause serious safety risks.

Common causes for water leaks are corrosion and freezing.

Corrosion: Materials in the system shall be safe to use with water and protected against corrosion.

Freezing: When water freezes into ice its volume expands which can damage heat exchanger walls and cause leaks. During oﬀ periods water inside heat exchangers could start freezing when ambient temperature is lower than 0°C. During on periods ice banking could occur when the circuit is running continuously at too low load. Both situations should be avoided by connecting a pressure and thermostat switch in the safety line.

42 AB225886435375en-001201

Application Guidelines

Sound and vibration management

Single compressors

Running sound level

Model Frequency RPS

VZH028-044

Average sound power for reference at ARI A/C conditions measured in free space. Please notice below two phenomenon is also normal for variable speed compressor:

1. At light load and low speed condition the compressor may produce certain discharge pulsation.

2. In some situations when the compressor stops working, there may still be some noise which lasts around 2 seconds. The electromagnetic noise is caused by drive anti-reverse protection.

60 77 70 77 70 77 70

100 86 79 86 79 86 79

Sound generation in a refrigeration or air conditioning system

For all VZH models, noise level given in table does not include bottom hood attenuation.

200 V 400 V 575 V

Without accoustic

hood (dBA)

Typical sound and vibration in refrigeration and air conditioning systems encountered by design and service engineers may be broken down into the following three source categories.

With accoustic

hood (dBA)

Without accoustic

hood (dBA)

With accoustic

hood (dBA)

Without accoustic

hood (dBA)

Mechanical vibrations: These generally extend along the parts of the unit and structure. Gas pulsation: This tends to travel through the cooling medium, i.e. the refrigerant.

With accoustic

hood (dBA)

Sound radiation: This generally takes an airborne path.

The following sections focus on the causes and methods of mitigation for each of the above sources.

Compressor sound radiation

For sound radiating from the compressor, the emission path is airborne and the sound waves travel directly from the machine in all directions.

outside. Ensure that no components capable of transmitting sound/vibration within the unit come into direct contact with any non insulated

parts on the walls of the unit. The VZH scroll compressor is designed to be quiet and the frequency of the sound generated is pushed into the higher ranges, which not only are easier to reduce but also do not generate the penetrating power of lower-frequency sound.

Because of the VZH unique design of a full-

suction gas-cooled motor, compressor body

insulation across its entire operating range is

possible. Acoustic hoods are available from

Danfoss as accessories. These hoods are quick Use of sound-insulation materials on the inside of unit panels is an eﬀective means of substantially

and easy to install and do not increase the overall

size of the compressors to a great extent. reducing the sound being transmitted to the

Mechanical vibrations

Speed by-pass

Gas pulsation

Vibration isolation constitutes the primary method for controlling structural vibration. VZH 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 eﬀective in reducing vibration being transmitted from the compressor(s) to the unit. Once the supplied rubber grommets have been properly mounted, vibrations transmitted from the compressor base

If vibrations occurs at some typical frequencies of the VZH variable speed compressor system, design must be checked: frame, piping, pipes using cushioned clamps. But if some frequencies continue to produce unacceptable

The VZH scroll compressor has been designed and tested to ensure that gas pulsation has been optimized for the most commonly encountered air conditioning pressure ratios. On heat pump installations and other installations where the pressure ratio lies beyond the typical range, testing should be conducted under all expected

plate to the unit are held to a strict minimum.

In addition, it is extremely important that the

frame supporting the mounted compressor be of

suﬃcient mass and stiﬀness to help dampen any

residual vibration potentially transmitted to the

frame.

For further information on mounting

requirements, please refer to the section on

mounting assembly.

vibration levels, speed by-pass is adjustable

in the frequency converter, in order to avoid

some frequency ranges. Four by-pass ranges

are adjustable, and settings can be made in

parameter group 4-6.

conditions and operating conﬁgurations to

ensure that minimum gas pulsation is present. If

an unacceptable level is identiﬁed, a discharge

muﬄer with the appropriate resonant volume

and mass should be installed. This information

can be obtained from the component

manufacturer.

43AB225886435375en-001201

Application Guidelines

Installation

Single compressors

Compressor handling

Mounting

Each compressor is shipped with printed instructions for installation. These instructions can also be downloaded from:

Each VZH scroll compressor is equipped with one lift ring on the top shell. Always use the ring when lifting the compressor. Use lifting equipment rated and certiﬁed for the weight of the compressor. A spreader bar rated for the weight of the compressor is highly recommended to ensure a better load distribution. The use of lifting hooks closed with a clasp certiﬁed to lift the weight of the compressor is also highly recommended. Always respect the appropriate rules concerning lifting objects of the type and weight of these compressors. Maintain the compressor in an upright position during all handling operations.

When the compressor is mounted as part of an installation, never use the lift rings on the compressor to lift the installation. The risk is that the lugs could separate from the compressor

Maximum inclination from the vertical plane, while operating must not exceed 7 degrees. All compressors are delivered with four rubber grommets and metal sleeves. Compressors must always be mounted with these grommets. Recommended torque for mounting bolts: 11 Nm (±1 Nm).

http://instructions.cc.danfoss.com

or that the compressor could separate from the base frame with extensive damage and possible personal injury as a result.

Never apply force to the terminal box with the intention of moving the compressor, as the force placed upon the terminal box can cause

HEAVY

do not lift manually

extensive damage to both the box and the components contained inside.

29.5

Ø11

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

Ø 41

Removing connections shipping plugs

Before the suction and discharge plugs are removed, the nitrogen holding charge must be released via the suction schrader valve to avoid an oil mist blowout. Remove the suction plug ﬁrst and the discharge plug afterwards. The plugs should be removed only just before connecting

the compressor to the installation in order to avoid moisture from entering the compressor. When the plugs are removed, it is essential to keep the compressor in an upright position so as to avoid oil spillage.

44 AB225886435375en-001201

Application Guidelines

Installation

Single compressors

System cleanliness The refrigerant compression system, regardless

of the type of compressor used, will only provide high eﬃciency and good reliability, along with a long operating life, if the system contains solely the refrigerant and oil it was designed for. Any other substances within the system will not improve performance and, in most cases, will be highly detrimental to a system’s

The use of highly hygroscopic polyolester oil in R410A compressors requires that the oil be exposed to the atmosphere as little as possible. System contamination is one of main factors aﬀecting equipment reliability and compressor service life. It is important therefore to take system cleanliness into account when assembling a refrigeration system. During the manufacturing process, circuit contamination may be caused by:

Tubing

Only use clean and dehydrated refrigeration grade copper tubing. Tube-cutting must be carried out so as not to deform the tubing roundness and to ensure that no foreign debris remains within the tubing. Only refrigerant grade ﬁttings should be used and these must be of

operation. The presence of non-condensable

substances and system contaminants such as

metal shavings, solder and ﬂux, have a negative

impact on compressor service life. Many of these

contaminants are small enough to pass through a

mesh screen and can cause considerable damage

within a bearing assembly.

• Brazing and welding oxides,

• Filings and particles from the removal of burrs in

pipe-work,

• Brazing ﬂux,

• Moisture and air.

Consequently, when building equipment

and assemblies, the precautions listed in the

following paragraphs must be taken.

both a design and size to allow for a minimum

pressure drop through the completed assembly.

Follow the brazing instructions bellow. Never drill

holes into parts of the pipe-work where ﬁlings

and particles can not be removed.

Filter driers

Brazing and soldering

Copper to copper connections

Dissimilar metals connections

Compressor connection

For new installations with VZH compressors with polyolester oil, Danfoss recommends using the Danfoss DML 100% molecular sieve, solid core ﬁlter drier. Molecular sieve ﬁlter driers with loose beads from third party suppliers shall be avoided. For servicing of existing installations where acid formation is present the Danfoss DCL solid core ﬁlter driers containing activated alumina are recommended.

When brazing copper-to-copper connections, the use of copper/phosphorus brazing alloy containing 5% silver or higher with a melting

When manipulating dissimilar metals such as copper and brass or steel, the use of silver solder and anti-oxidant ﬂux is required.

When brazing the compressor ﬁttings, do not overheat the compressor shell, which could severely damage certain internal components due to excessive heating. Use of a heat shield and/or a heat-absorbent compound is highly recommended. Due to the relatively sizable tubing and ﬁtting diameters a double-tipped torch using acetylene is recommended for brazing operation on VZH compressors.

The drier is to be oversized rather than

undersized. When selecting a drier, always take

into account its capacity (water content capacity),

the system refrigeration capacity and the system

refrigerant charge.

temperature of below 800°C is recommended. No

ﬂux is required during brazing.

heat shield

45AB225886435375en-001201

Application Guidelines

Installation

Single compressors

For brazing the suction and discharge connections, the following procedure is advised:

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

• Protect painted surfaces on the terminal box and compressor from torch heat damage (see diagram).

• Remove the Teﬂon gaskets when brazing rotolock connectors with solder sleeves.

• Use only clean, refrigeration-grade copper tubing and clean all connections.

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

• Purge nitrogen or CO

through the compressor

in order to prevent against oxidation and ﬂammable conditions. The compressor should not be exposed to the open air for extended periods.

• Use of a double-tipped torch is recommended.

• Apply heat evenly to area A until the brazing temperature is reached. Move the torch to area B and apply heat evenly until the brazing temperature has been reached there as well, and then begin adding the brazing material. Move the torch evenly around the joint, in applying only enough brazing material to ﬂow the full circumference of the joint.

• Move the torch to area C only long enough to draw the brazing material into the joint, but not into the compressor.

• Remove all remaining ﬂux “once the joint has been soldered” with a wire brush or a wet cloth. Remaining ﬂux would cause corrosion of the tubing.

Ensure that no ﬂux is allowed to enter into the tubing or compressor. Flux is acidic and can cause substantial damage to the internal parts of the system and compressor.

The polyolester oil used in VZH compressors is highly hygroscopic and will rapidly absorb moisture from the air. The compressor must therefore not be left open to the atmosphere for a long period of time. The compressor ﬁtting plugs shall be removed just before brazing the compressor. The compressor should always be the last component brazed into the system

Before eventual unbrazing the compressor or any system component, the refrigerant charge must be removed from both the high- and low-pressure sides. Failure to do so may result in serious personal injury. Pressure gauges must be used to ensure all pressures are at atmospheric level.

For more detailed information on the appropriate materials required for brazing or soldering, please contact the product manufacturer or distributor. For speciﬁc applications not covered herein, please contact Danfoss for further information.

High voltage test

System pressure test

Carry out a high voltage test by short-circuiting terminals U, V, W, L1, L2 and L3. Energize by max. 1920 V DC for code G compressors and 1460 V DC for code J compressors for one second between this short-circuit and the chassis. When running high voltage tests of the entire installation, frequency converter and compressor electrical

Always use an inert gas such as nitrogen for pressure testing. Never use other gases such as

motor compressor test can be conducted together. When conducting a high voltage test make sure the system is not under vacuum: this may cause electrical motor compressor failure. Please note, it is note recommended that a highvoltage test be carried out too often as it may damage the motor.

an inﬂammable mixture. Do not exceed the following pressures:

oxygen, dry air or acetylene as these may form

Maximum compressor test pressure (Low side) 30 bar

Maximum compressor test pressure (High side) 41.1 b ar Maximum pressure diﬀerence between high side and

low side of the compressor

Pressurize the system on HP side ﬁrst then LP side to prevent rotation of the scroll. Never let the

pressure on LP side exceed the pressure on HP side with more than 5 bar.

36 bar

46 AB225886435375en-001201

Application Guidelines

Installation

Single compressors

Leak detection Leak detection must be carried out using a

mixture of nitrogen and refrigerant or nitrogen and helium, as indicated in the table below. Never use other gasses such as oxygen, dry air or acetylene as these may form an inﬂammable mixture.

Pressurize the system on HP side ﬁrst then LP side.

Vacuum pump down and moisture removal

Refrigerant charging

Moisture obstructs the proper functioning of both the compressor and the refrigeration system. Air and moisture reduce service life and increase condensation pressure, which causes abnormally high discharge temperatures that are then capable of degrading the lubricating properties of the oil. The risk of acid formation is also increased by air and moisture, and this condition can also lead to copper plating. All

For the initial charge, the compressor must not run and eventual service valves must be closed. Charge refrigerant as close as possible to the nominal system charge before starting the compressor. This initial charging operation must be done in liquid phase as far away as possible from the compressor. The best location is on the liquid line between the condenser outlet and the ﬁlter drier. Then during commissioning, when needed, a complement of charge can be done

Leak detection

with refrigerant

Nitrogen & R410A Nitrogen & Helium

these phenomena may cause both mechanical and electrical compressor failures. The typical method for avoiding such problems is a vacuum pump-down executed with a vacuum pump, thus creating a minimum vacuum of 500 microns (0.67 mbar). Please refer to News bulletin Tl1-026-0302 “Vacuum pump down and dehydration procedure”.

in liquid phase: slowly throttling liquid in on the low pressure side as far away as possible from the compressor suction connection. The refrigerant charge quantity must be suitable for both summer and winter operations.

Refer to news bulletin FRCC.EN.050 “Danfoss Commercial Compressors recommended refrigerant system charging practice” for more details.

Leak detection

with a mass spectrometer

Commissioning

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

• Proper metering device operation and desired superheat readings

• Suction and discharge pressure are within acceptable levels

• Correct oil level in compressor sump indicating proper oil return

• Low foaming in sight glass and compressor sump temperature 10K above saturation temperature to show that there is no refrigerant migration taking place

• Acceptable cycling rate of compressors, including duration of run times.

Note this compressor is equipped with a four-pole electrical motor so the applied frequency from the inverter will be 30 Hz for

A short cycling protection is provided in the CDS frequency converter. It is factory preset “enabled” with the following parameters in:

28.01 - interval between 2 starts: 300 secondes

28.02 - minimum run time: 60 seconds.

This minimum run time is set to guaranty long enough running time at start up in order to create enough refrigerant ﬂow velocity in the system to recover the oil to the compressor sump.

• Current draw of compressor within acceptable values (RLA ratings)

• No abnormal vibrations and noise.

15 rps(900 rpm) up to 200 Hz for 100 rps (6000 rpm).

47AB225886435375en-001201

Application Guidelines

Installation

Single compressors

Oil level checking and top-up

In installations with good oil return and line runs up to 15 m, no additional oil is required. If installation lines exceed 15 m, additional oil may be needed. 1 or 2% of the total system refrigerant charge (in kg) can be used to roughly deﬁne the required oil top-up quantity (in liters) but in any case the oil charge has to be adjusted based on the oil level in the compressor sight glass.

When the compressor is running under stabilized conditions, the oil level must be visible in the sight glass.

The presence of foam ﬁlling in the sight glass indicates large concentration of refrigerant in the oil and / or presence of liquid returning to the compressor.

The oil level can also be checked a few minutes after the compressor stops, the level must be between ¼ and ¾ of sight glass.

When the compressor is oﬀ, the level in the sight glass can be inﬂuenced by the presence of refrigerant in the oil.

VZH028-035-044 are factory charged with PVE32(160HV), when topping up the compressor, customer could also use PVE68(320HV) lubricant. Danfoss supply PVE68 as accessory.

There will be no reliability risks even VZH is with 100% PVE68, but the mixture of PVE32 and PVE68 will cause performance drop.

Top-up the oil while the compressor is idle. Use the schrader connector or any other accessible connector on the compressor suction line and a suitable pump. See news bulletin “Lubricants ﬁlling in instructions for Danfoss Commercial Compressors.”

48 AB225886435375en-001201

Application Guidelines





a

Trouble shooting

c





 

 





Single compressors

















s







f o





O



&



















 

s & w

c

w

ms



















Smains









Check HP/LP

switch

Reset & start

e

c





b

s

a



l

49AB225886435375en-001201

Application Guidelines





Trouble shooting

Single compressors





heating



t 





 



 o





m 



r





overheating

50 AB225886435375en-001201

Application Guidelines

Trouble shooting





Single compressors





  

  















 

 

  

    





51AB225886435375en-001201

Depth

Height

Width

CD803 packaging

Application Guidelines

Ordering information and packaging

Single compressors

Kit ordering and shipping

Packaging

Compressor single pack

Compressor Industrial pack

Frequency converter single pack

The tables on the following pages give code numbers for ordering purposes for the VZH

Compressor model

VZH028/035/044 464 292 286 30

Height

(mm)

Compressors are not packed individually but are shipped all together on one pallet. They can be

Compressor

model

VZH028 12 1170 815 625 430 3

VZH035 12 1170 815 625 450 3

VZH044 12 1170 815 625 450 3

Drive supply

voltage

T2: Code J

T4: Code G

T6: Code H

Nbr*

Compressor

VZH028/035 H4 380 250 375 7.9

VZH044 H5 420 290 375 9.5

VZH028/035 H3 255 100 206 4.5

VZH044 H4 380 250 375 7.9

VZH028 A3 390 196 301 6.6

VZH035/044 B3 349 500 330 13

Length

(mm)

enclosure

Drive

compressor and CDS frequency converter kit packed and shipped separately.

Width (mm)

Depth

(mm)

ordered in quantities of full pallets only, multiples of 12 compressors, according below table.

Width (mm)

Height (mm)

Height

(mm)

Width

(mm)

Gross Weight

(kg)

IP20

Depth

(mm)

Weight

(kg)

Static

stacking

pallets

Weight

(kg)

Ordering information

Compressors single pack

Compressor

model

VZH028

VZH035

VZH044

Equipment

version

OSG VZH028CGANB 120G0188 VZH028CJANB 120 G018 6 VZH028CHANB 120G0187

OLS VZH028CGBNB 120G 0263 VZH028CJBNB 12 0G026 4 VZH028CHBNB 120G0 301

OSG VZH035CGANB 120G0185 VZH035CJANB 120G0183 VZH035CHANB 120G0184

OLS VZH035CGBNB 120G0247 VZH035CJBNB 120G0246 VZH035CHBNB 120G 0302

OSG VZH044CGANB 12 0G0182 VZH044CJANB 120G0180 VZH044CHANB 120 G0181

OLS VZH044CGBNB 120 G0245 VZH044CJBNB 120G 0244 VZH044CHBNB 12 0G0243

VZH scroll compressors can be ordered in single packs and industrial packs. Drive can be ordered

in single packs. Please use the code numbers from below tables for ordering.

G J H

Compressor Name Code No Compressor Name Code No Compressor Name Code No

52 AB225886435375en-001201

Application Guidelines

Compressor Industrial pack

Ordering information and packaging

Single compressors

Compressor

model

VZH028

VZH035

VZH044

Equipment

version

OSG VZH028CGANB/I 120 G0179 VZH028CJANB/I 120G 0259 VZH028CHANB/I 120G0178

OLS VZH028CGBNB/I 120G0303 VZH028CJBNB/I 120 G03 04 - -

OSG VZH035CGANB/I 120G0258 VZH035CJANB/I 12 0G025 6 VZH035CHANB/I 120 G0257

OLS VZH035CGBNB/I 120G0252 VZH035CJBNB/I 120G 0251 - -

OSG VZH044CGANB/I 120G0255 VZH044CJANB/I 120G0253 VZH044CHANB/I 120G 0254

OLS VZH044CGBNB/I 120G0250 VZH044CJBNB/I 120G 0249 - -

Compressor Name Code No Compressor Name Code No Compressor Name Code No

VZH converter order information

Voltage Compressor Description Code NO

200-24 0V/3ph/50&6 0Hz

380-480V/3ph/50&60Hz

LCP: user interface 120Z0581 (accessory)

G J H

CDS803 drive

VZH028 CDS803P6K0T2E20H4 13 4N4260

VZH035 CDS803P7K5T2E20H4 134 N4261

VZH044 CDS803P10KT2E20H4 134 L9470

VZH028 CDS803P6K0T4E20H4 134N 4262

VZH035 CDS 803P7K 5T4E 20H4 134 N4263

VZH044 CDS803P10KT4E20H4 134L9473

Voltage Compressor Description Code NO

525-600V/3ph/50&60Hz

LCP: user interface 120Z0326 (accessory)

CDS303 drive

VZH028 CDS303P7K5T6E20HX 13 4X8358

VZH035 CDS 303P 11KT6 E20HX 135N3582

VZH044 C DS30 3P11K T6E2 0H X 135N3582

53AB225886435375en-001201

Application Guidelines

Accessories

Single compressors

Rotolock adaptor

Typ e Code n° Description Application Packaging Pack size

120Z0366 Rotolock adaptor (1-1/4" ~ 3/4") VZH028-044 suction Multipack 10

120Z0365 Rotolock adaptor (1" ~ 1/2") VZH028-044 discharge Multipack 10

Valves, adapters, connectors & gaskets for use on suction and discharge connections

Solder sleeve adapter sets

Typ e Code n° Description Application Packaging Pack size

120Z0126

Solder sleeve adapter set (1"1/4 Rotolock, 3/4" ODF), (1" Rotolock, 1/2" ODF)

VZH028-044 Multipack 6

Crankcase heaters & thermostats

Crankcase heaters

Typ e Code n° Description Application Packaging Pack size

120Z5040 Belt type crankcase heater,65W,230V,CE mark,UL(wire length: 1270mm)

120Z5041 Belt type crankcase heater,55/70W,400/460V,CE mark,UL(wire length: 1270mm) Multipack 4

VZH028-044

Multipack 4

Lubricant, acoustic hoods and spare parts

Acoustic hoods

Typ e Code n° Description Application Packaging Pack size

120Z5083 Acoustic hood VZH028-044 Single pack 1

Oil level switch

Typ e Code n° Description Application Packaging Pack size

120Z0561 Oil level switch - electrical part (24V AC/DC) All models Single pack 1

120Z0562 Oil level switch - electrical part (230V AC) All models Single pack 1

54 AB225886435375en-001201

Application Guidelines

Accessories

Single compressors

Mounting kits

Typ e Code n° Description Application Packaging Pack size

120Z0622

Mounting kit for 1 scroll compressor including 4 grommets, 4 sleeves, 4 bolts, 4 washers, 2 grounding screws

VZH028-044 Single pack 1

Terminal boxes, covers & T-block connectors

Typ e Code n° Description Application Packaging Pack size

120Z5015 Terminal box cover VZH028-044 Multipack 10

Lubricant

Typ e Code n° Description Application Packaging Pack size

320HV 120 Z5034 PVE68 Lubricant, 2 liter can VZH028-044 Multipack 12

Spare parts frequency converter

LCP ’s

Typ e Code n° Description Application Packaging Pack size

120Z0581 LCP

120Z0 617

120Z0326 LCP

LCP kit for remote mounting contains rubber sealing, 3m cable, bracket and screws

Frequency converter 803 / VZH028-044 code G & code J

Frequency converter CDS803 / VZH028044 code G & code J

Frequency converter CDS303/ VZH028044 code H

Single pack 1

Decoupling Plate

Compressor

Frame

200-24 0V 380-480V

H3 - VZH028/035 120Z0582 Single pack 1

H4 VZH028/035 VZH044 120Z0583 Single pack 1

H5 VZH044 - 120Z0583 Single pack 1

Note: use the decoupling plate for EMC correct installation

Decoupling plate Packaging Pack size

55AB225886435375en-001201

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 VZH028-035-044 Application guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Compressor size

Frequency converter variants

Compressor and frequency converter combinations

VLT Compressor Drives literatures

Frequency converter nomenclature

Label

Serial number

Capacity at EN12900 conditions - VZH028CJ-VZH035CJ-VZH044CJ

Dimensions

Sight glass / Oil level sensor

Schrader

Suction & discharge connections

Frequency converter dimensions

CDS803 frequency converter

CDS303 frequency converter

Supply voltage

Terminal cover mounting The terminal cover and gasket should be installed

Terminal cover removal

Fuses

Wire sizes Below table lists recommended wiring sizes for the motor compressor power supply cables. These

Wiring & EMC protection The motor compressor power supply from

EMC correct installation of an IP20 frequency drive CDS803

Wiring diagram of CDS803

Wiring connections of CDS803

EMC correct installation of an IP20 frequency drive CDS303

Wiring diagram of CDS303

Wiring connections of CDS303

Electrical connections

Soft-start control

Phase sequency and reverse rotation protection

IP rating

Motor protection

Anti-reverse protection

Temperature protection

Voltage imbalance

Low voltage directive 2014/35/EU

Internal free volume

Operating conditions

Short cycle timer function

Discharge gas thermostat Discharge gas temperature (DGT) protection

Oil return management function (single compressor)

High and low pressure protection

System design recommendations

Essential piping design considerations

Oil management

Heat exchangers

Refrigerant charge limits

Manage superheat During normal operation, refrigerant enters

Brazed plate heat exchangers

Reversible heat pump systems

Sound generation in a refrigeration or air conditioning system

Compressor sound radiation

Mechanical vibrations

Speed by-pass

Gas pulsation

Compressor handling

Mounting

Removing connections shipping plugs

System cleanliness The refrigerant compression system, regardless

Tubing

Filter driers

Brazing and soldering

Compressor connection

High voltage test

System pressure test

Vacuum pump down and moisture removal

Refrigerant charging

Leak detection

Commissioning

Oil level checking and top-up

Trouble shooting

Ordering information and packaging

Kit ordering and shipping

Packaging

VZH converter order information

Valves, adapters, connectors & gaskets for use on suction and discharge connections