Danfoss PSH019 Instruction Manual

Danfoss scroll compressors
PSH019 to PSH039
50 - 60 Hz - R410A
Application guidelines
http://cc.danfoss.com

Content
Scroll compressor principle ............................. 4
Nomenclature and specications.................... 5
Compressor model designation...................................... 5
Nomenclature........................................................................ 5
Technical specication ....................................................... 5
Performance data - 50 Hz................................. 6
Performance data - 60 Hz................................. 7
Dimensions ....................................................... 8
PSH019 ..................................................................................... 8
PSH023-026-030-034 .......................................................... 9
PSH039 ...................................................................................10
Electrical data, connections and wiring .......11
Connection Details ............................................................11
Suction and discharge connections ............................11
Oil sight glass.......................................................................11
Oil equalisation connection............................................11
Schrader.................................................................................11
Liquid injection valve........................................................11
Motor voltage ......................................................................12
Voltage imbalance .............................................................12
Electrical data.......................................................................12
LRA (Locked Rotor Amp)..................................................13
MCC (Maximum Continuous Current).........................13
Max. operating Current....................................................13
Winding resistance.............................................................13
General wiring information ............................................13
Wiring Connections...........................................................14
IP Rating.................................................................................14
Terminal box temperature ..............................................15
Terminal box knock-out dimensions...........................15
Compressor protection ....................................................15
Approvals and certicates .............................16
Approvals and certicates...............................................16
Pressure Equipment ..........................................................16
Low voltage directive........................................................16
Machines directive.............................................................16
Internal free volume..........................................................16
Operating conditions .....................................17
Refrigerant and lubricants...............................................17
Motor supply........................................................................17
Compressor ambient temperature ..............................17
Application envelope........................................................18
Discharge temperature protection..............................18
High and low pressure protection................................18
Liquid Injection ...................................................................19
Cycle rate limit.....................................................................20
System design recommendations.................21
General...................................................................................21
Essential piping design considerations......................21
O-cycle migration............................................................22
Liquid ood back................................................................24
Specic application recommendations ........25
Low ambient application.................................................25
Low load operation............................................................26
Brazed plate heat exchangers........................................26
Electronic expansion valve .............................................26
Reversible heat pump systems......................................26
Water utilizing systems.....................................................27
Sound and vibration management...............28
Starting sound level...........................................................28
Running sound level .........................................................28
Stopping sound level........................................................28
Installation ......................................................29
Compressor handling and storage...............................29
Compressor mounting .....................................................29
Parallel Installation.............................................................29
Tandem Kits..........................................................................30
Tandem Conguration......................................................31
Compressor holding charge...........................................31
System cleanliness .............................................................31
Tubing.....................................................................................32
Brazing and soldering.......................................................32
System pressure test .........................................................33
Leak detection.....................................................................33
Vacuum evacuation and moisture removal..............34
Filter driers ...........................................................................34
Refrigerant charging .........................................................34
Refrigerant charge limit ...................................................35
Insulation resistance and dielectric strength...........35
Commissioning ...................................................................35
Oil level checking and top-up........................................35
Ordering information and packaging...........36
Packaging..............................................................................36
Ordering information........................................................37
Accessories......................................................38
3FRCC.PC.022.A4.02
Application Guidelines

Scroll compressor principle
In a Danfoss heat pump scroll compressor, the
compression is performed by two scroll elements
located in the upper part of the compressor.
Suction gas enters the compressor at the suction
connection. As all of the gas ows around and
through the electrical motor, thus ensuring
complete motor cooling in all applications, oil
droplets separate and fall into the oil sump.
After exiting the electrical motor, the gas enters
the scroll elements where compression takes
place. Ultimately, the discharge gas leaves the
compressor at the discharge connection.
The gure below illustrates the entire
compression process. The centre of the orbiting
scroll (in grey) traces a circular path around
the centre of the xed scroll (in black). This
movement creates symmetrical compression
pockets between the two scroll elements.
Low-pressure suction gas is trapped within
each crescent-shaped pocket as it gets formed;
continuous motion of the orbiting scroll serves
to seal the pocket, which decreases in volume
as the pocket moves towards the centre of the
scroll set increasing the gas pressure. Maximum
compression is achieved once a pocket reaches
the centre where the discharge port is located;
this stage occurs after three complete orbits.
Compression is a continuous process: the scroll
movement is suction, compression and discharge
all at the same time.
4FRCC.PC.022.A4.02
Application Guidelines

Nomenclature and specications
Compressor model
designation
Nomenclature
Technical specication
Danfoss PSH scroll compressors for R410A are
available as single and manifolding compressors.
The example below presents the compressor
nomenclature which equals to the technical
reference as shown on the compressor
nameplate. Code numbers for ordering are listed
in section “Ordering information and packaging”.
Model
Nominal
Heating
capacity Power Input COP Swept
volume Displacement Oil charge Net weight 
WkW W/W cm3/rev m3/h dm3kg
50Hz
PSH019 19 600 6.62 2.96 88.40 15.40 3.0 58.5
PSH023 23 000 7.47 3.07 103.50 18.00 3.3 64.5
PSH026 26 000 8.65 3.00 116.90 20.30 3.3 64.5
PSH030 30 000 9.60 3.13 133.00 23.12 3.3 67.5
PSH034 34 200 10.95 3.12 151.17 26.40 3.3 69.5
PSH039 38 900 12.19 3.19 170. 30 29.60 3.6 72.0
60Hz
PSH019 23 600 7.97 2.96 88.40 18.60 3.0 58.5
PSH023 28 000 8.84 3.17 103.50 21.80 3.3 64.5
PSH026 31 400 10.19 3.08 116.90 24.60 3.3 64.5
PSH030 35 700 11.35 3.15 133.00 27.90 3.3 67.5
PSH034 40 500 12.72 3.18 151.17 31.90 3.3 69.5
PSH039 46 500 14.49 3.21 170.30 35.80 3.6 72.0
Evaporating temperature: -7°C Condensing temperature:50°C Superheat: 5K Subcooling:4K
Refrigerant: R410A
Displacement at nominal speed: 2900rpm at 50Hz. 3500rpm at 60Hz
Net weight with oil charge
CLC4A039SHP
Heat pump
application
Scroll (commercial /
large commercial)
Lubricant
R410A, POE
Heating capacity
in kW at 50Hz
-7°C/50°C/SH5K/SC4K
UL index
Evolution index
Motor protection type
L: Internal overload protector
Connections
A: bare compressor
C: full package (including injection valve)
Motor voltage code
3: 200-230V/3~/60Hz
4: 380-400V/3~/50Hz - 460V/3~/60Hz
9: 380V/3~/60Hz - 342-418V/3~/60Hz
5FRCC.PC.022.A4.02
Application Guidelines

Performance data - 50 Hz
Cooling
Heating
Te -30 -20 -15 -10 -5 0 5 10 15
Tc Cooling
(W)
Pe
(kW)
Cooling
(W)
Pe
(kW)
Cooling
(W)
Pe
(kW)
Cooling
(W)
Pe
(kW)
Cooling
(W)
Pe
(kW)
Cooling
(W)
Pe
(kW)
Cooling
(W)
Pe
(kW)
Cooling
(W)
Pe
(kW)
Cooling
(W)
Pe
(kW)
PSH019-4
20 7 040 3.48 11 140 3.59 13 810 3.66 16 930 3.75 20 570 3.87 24 740 4.03 29 510 4.23 ----
30 6 170 4.26 10 070 4.36 12 560 4.41 15 470 4.48 18 840 4.57 22 710 4.68 27 130 4.83 32 130 5.02 37 760 5.27
40 5 230 5.25 8 820 5.36 11 10 0 5.40 13 750 5.44 16 810 5.50 20 330 5.58 24 340 5.68 28 900 5.81 34 040 5.99
50 4 230 6.52 7 430 6.65 9 430 6.68 11 770 6.72 14 470 6.75 17 590 6.79 21 160 6.86 25 220 6.94 29 820 7.0 6
60 - - 5 890 8.31 7 580 8.35 9 550 8.37 11 8 40 8.39 14 510 8.41 17 580 8.44 21 100 8.48 25 110 8.55
68 - - - - - - 7 600 10.03 9 530 10.04 11 800 10.04 14 440 10.04 17 490 10.06 20 990 10.09
PSH023-4
20 8 570 4.08 13 310 4.38 16 360 4.52 19 940 4.61 24 100 4.64 28 880 4.58 34 340 4.42 ----
30 7 470 4.91 11 980 5.13 14 860 5.29 18 220 5.44 22 100 5.57 26 560 5.66 31 650 5.67 37 420 5.60 43 920 5.41
40 6 310 6.15 10 500 6.14 13 140 6.25 16 220 6.39 19 780 6.55 23 870 6.70 28 540 6.83 33 840 6.90 39 830 6.90
50 5 080 8.01 8 830 7.63 11 190 7. 61 13 940 7.67 17 120 7.78 20 780 7.93 24 990 8.09 29 770 8.24 35 200 8.36
60 - - 6 990 9.82 9 010 9.60 11 370 9.50 14 120 9.50 17 310 9.57 20 980 9.69 25 200 9.84 30 010 10.00
68 ------9 100 11. 50 11 4 60 11.35 14 230 11.31 17 450 11.35 21 180 11. 45 25 450 11.59
PSH026-4
20 9 490 4.47 15 160 4.64 18 860 4.76 23 220 4.93 28 290 5.14 34 130 5.41 40 800 5.74 ----
30 8 350 5.49 13 720 5.61 17 160 5.69 21 200 5.81 25 880 5.97 31 260 6.17 37 410 6.44 44 370 6.77 52 210 7.18
40 7 140 6.82 12 060 6.90 15 190 6.95 18 840 7.02 23 070 7.13 27 930 7.28 33 490 7.47 39 800 7.73 46 910 8.05
50 5 840 8.55 10 210 8.60 12 950 8.63 16 160 8.67 19 870 8.73 24 150 8.82 29 050 8.95 34 640 9.14 40 980 9.38
60 - - 8 150 10.82 10 450 10.82 13 140 10.83 16 270 10.85 19 910 10.90 24 100 10.97 28 910 11.09 34 390 11.26
68 - - - - - - 10 490 13.01 13 120 13.00 16 190 13.01 19 770 13.05 23 910 13.12 28 670 13.23
PSH030-4
20 11 280 5.02 17 620 5.23 21 730 5.34 26 560 5.49 32 160 5.67 38 600 5.90 45 950 6.19 ----
30 9 960 6.05 15 940 6.28 19 760 6.38 24 220 6.50 29 380 6.64 35 320 6.81 42 080 7. 03 49 750 7. 32 58 370 7.69
40 8 580 7.35 14 070 7.63 17 530 7.74 21 570 7.85 26 240 7.96 31 600 8.10 37 720 8.27 44 670 8.49 52 500 8.77
50 7 130 8.98 12 000 9.36 15 050 9.50 18 590 9.61 22 690 9.72 27 420 9.84 32 840 9.98 39 000 10.15 45 990 10.37
60 - - 9 710 11. 56 12 280 11.74 15 270 11.8 8 18 740 12.00 22 770 12.12 27 420 12.24 32 740 12.38 38 810 12.56
68 ------12 350 14.11 15 280 14.26 18 710 14.39 22 690 14.51 27 290 14.64 32 580 14.80
PSH034-4
20 12 690 5.57 20 070 5.82 24 860 5.97 30 460 6.14 36 960 6.33 44 430 6.52 52 940 6.72 ----
30 11 14 0 6.83 18 060 6.99 22 470 7.12 27 620 7. 28 33 580 7.45 40 410 7.65 48 200 7. 86 57 020 8.08 66 940 8.30
40 9 560 8.55 15 910 8.59 19 900 8.67 24 530 8.78 29 880 8.93 36 020 9.10 43 030 9.30 50 970 9.52 59 930 9.76
50 7 930 10.91 13 580 10.77 17 080 10.78 21 140 10.83 25 830 10.92 31 220 11.05 37 380 11.22 44 400 11.42 52 330 11.6 4
60 - - 11 030 13.70 14 000 13.61 17 430 13.58 21 390 13.60 25 970 13.66 31 230 13.77 37 250 13.92 44 110 14 .11
68 ------14 190 16.39 17 540 16.34 21 420 16.33 25 920 16.38 31 110 16.48 37 060 16.62
PSH039-4
20 14 480 6.13 22 290 6.48 27 420 6.70 33 450 6.95 40 450 7. 26 48 500 7.63 57 660 8.07 ----
30 12 950 7.46 20 350 7.81 25 110 8.01 30 690 8.24 37 140 8.51 44 530 8.83 52 930 9.21 62 420 9.66 73 050 10.20
40 11 290 9.13 18 110 9.48 22 440 9.67 27 480 9.87 33 300 10.10 39 960 10.38 47 530 10.70 56 090 11.08 65 690 11.54
50 9 450 11.31 15 540 11.69 19 350 11. 86 23 780 12.04 28 880 12.24 34 730 12.47 41 400 12.73 48 940 13.05 57 440 13.43
60 - - 12 560 14.60 15 790 14.77 19 520 14.93 23 830 15.10 28 790 15.28 34 470 15.50 40 920 15.75 48 230 16.05
68 ------15 680 17. 89 19 300 18.03 23 490 18.19 28 320 18.36 33 850 18.56 40 150 18.80
Te -30 -20 -15 -10 -5 0 5 10 15
Tc Heating
(W)
Pe
(kW)
Heating
(W)
Pe
(kW)
Heating
(W)
Pe
(kW)
Heating
(W)
Pe
(kW)
Heating
(W)
Pe
(kW)
Heating
(W)
Pe
(kW)
Heating
(W)
Pe
(kW)
Heating
(W)
Pe
(kW)
Heating
(W)
Pe
(kW)
PSH019-4
20 10 370 3.48 14 580 3.59 17 310 3.66 20 520 3.75 24 270 3.87 28 600 4.03 33 560 4.23 ----
30 10 240 4.26 14 240 4.36 16 790 4.41 19 760 4.48 23 210 4.57 27 190 4.68 31 750 4.83 36 940 5.02 42 800 5.27
40 10 250 5.25 13 950 5.36 16 270 5.40 18 960 5.44 22 070 5.50 25 660 5.58 29 780 5.68 34 470 5.81 39 780 5.99
50 10 470 6.52 13 790 6.65 15 830 6.68 18 200 6.72 20 930 6.75 24 090 6.79 27 720 6.86 31 870 6.94 36 580 7.0 6
60 - - 13 840 8.31 15 570 8.35 17 560 8.37 19 880 8.39 22 560 8.41 25 650 8.44 29 220 8.48 33 290 8.55
68 ------17 200 10.03 19 140 10.04 21 410 10.04 24 050 10.04 27 120 10.06 30 650 10.09
PSH023-4
20 12 500 4.08 17 520 4.38 20 710 4.52 24 380 4.61 28 570 4.64 33 300 4.58 38 590 4.42 ----
30 12 200 4.91 16 920 5.13 19 950 5.29 23 450 5.44 27 460 5.57 32 010 5.66 37 120 5.67 42 810 5.60 49 130 5.41
40 12 230 6.15 16 410 6.14 19 150 6.25 22 370 6.39 26 080 6.55 30 320 6.70 35 110 6.83 40 490 6.90 46 470 6.90
50 12 790 8.01 16 180 7.63 18 520 7. 61 21 320 7.67 24 610 7.78 28 420 7.93 32 780 8.09 37 710 8.24 43 250 8.36
60 - - 16 440 9.82 18 250 9.60 20 510 9.50 23 260 9.50 26 520 9.57 30 310 9.69 34 680 9.84 39 640 10.00
68 ------20 170 11.50 22 390 11.35 25 120 11. 31 28 380 11.35 32 210 11.45 36 620 11.59
PSH026-4
20 13 880 4.47 19 720 4.64 23 540 4.76 28 060 4.93 33 340 5.14 39 450 5.41 46 450 5.74 ----
30 13 750 5.49 19 230 5.61 22 760 5.69 26 910 5.81 31 740 5.97 37 330 6.17 43 730 6.44 51 020 6.77 59 260 7.18
40 13 840 6.82 18 840 6.90 22 020 6.95 25 750 7.02 30 080 7.13 35 080 7. 28 40 830 7.47 47 390 7.73 54 830 8.05
50 14 250 8.55 18 660 8.60 21 430 8.63 24 670 8.67 28 440 8.73 32 810 8.82 37 850 8.95 43 620 9.14 50 190 9.38
60 - - 18 780 10.82 21 090 10.82 23 790 10.83 26 940 10.85 30 620 10.90 34 880 10.97 39 810 11.09 45 460 11.26
68 - - - - - - 23 280 13.01 25 900 13.00 28 980 13.01 32 590 13.05 36 800 13.12 41 670 13.23
PSH030-4
20 16 270 5.02 22 820 5.23 27 050 5.34 32 010 5.49 37 790 5.67 44 460 5.90 52 110 6.19 ----
30 15 980 6.05 22 190 6.28 26 110 6.38 30 680 6.50 35 980 6.64 42 090 6.81 49 080 7. 03 57 030 7.32 66 020 7.69
40 15 890 7.35 21 660 7.63 25 230 7.74 29 370 7.85 34 150 7.96 39 650 8.10 45 940 8.27 53 110 8.49 61 230 8.77
50 16 060 8.98 21 310 9.36 24 490 9.50 28 150 9.61 32 360 9.72 37 210 9.84 42 760 9.98 49 100 10.15 56 300 10.37
60 - - 21 200 11.56 23 950 11.74 27 080 11.8 8 30 680 12.00 34 830 12.12 39 600 12.24 45 060 12.38 51 300 12.56
68 - - - - - - 26 380 14.11 29 460 14.26 33 020 14.39 37 120 14.51 41 860 14.64 47 300 14.80
PSH034-4
20 17 960 5.57 25 580 5.82 30 500 5.97 36 270 6.14 42 950 6.33 50 600 6.52 59 300 6.72 ----
30 17 600 6.83 24 670 6.99 29 210 7.12 34 510 7.28 40 630 7.45 47 650 7.65 55 630 7.8 6 64 660 8.08 74 790 8.30
40 17 660 8.55 24 030 8.59 28 090 8.67 32 840 8.78 38 330 8.93 44 630 9.10 51 830 9.30 59 980 9.52 69 160 9.76
50 18 250 10.91 23 760 10.77 27 280 10.78 31 390 10.83 36 160 10.92 41 680 11.05 48 000 11.22 55 200 11.42 63 340 11. 64
60 - - 23 990 13.70 26 870 13.61 30 270 13.58 34 250 13.60 38 900 13.66 44 260 13.77 50 430 13.92 57 460 14 .11
68 ------29 700 16.39 32 990 16.34 36 880 16.33 41 420 16.38 46 700 16.48 52 780 16.62
PSH039-4
20 20 570 6.13 28 720 6.48 34 060 6.70 40 340 6.95 47 650 7.26 56 060 7. 63 65 660 8.07 ----
30 20 350 7.46 28 090 7. 81 33 060 8.01 38 860 8.24 45 570 8.51 53 280 8.83 62 070 9.21 72 000 9.66 83 170 10.20
40 20 340 9.13 27 520 9.48 32 030 9.67 37 280 9.87 43 320 10.10 50 250 10.38 58 150 10.70 67 080 11. 08 77 140 11. 54
50 20 670 11.31 27 130 11. 69 31 120 11.86 35 720 12.04 41 020 12.24 47 100 12.47 54 030 12.73 61 880 13.05 70 750 13.43
60 - - 27 040 14.60 30 440 14.77 34 330 14.93 38 810 15.10 43 950 15.28 49 840 15.50 56 540 15.75 64 150 16.05
68 ------33 420 17.89 37 190 18.03 41 530 18.19 46 520 18.36 52 250 18.56 58 790 18.80
Refrigerant: R410A Frequency 50 Hz Subcooling: 4K Superheat: 5K
Subject to modication without prior notication. For full data details and capacity table, refer to Online Datasheet Generator: www.danfoss.com/odsg
6FRCC.PC.022.A4.02
Application Guidelines

Performance data - 60 Hz
Cooling
Heating
Te -30 -20 -15 -10 -5 0 5 10 15
Tc Cooling
(W)
Pe
(kW)
Cooling
(W)
Pe
(kW)
Cooling
(W)
Pe
(kW)
Cooling
(W)
Pe
(kW)
Cooling
(W)
Pe
(kW)
Cooling
(W)
Pe
(kW)
Cooling
(W)
Pe
(kW)
Cooling
(W)
Pe
(kW)
Cooling
(W)
Pe
(kW)
PSH019-4
20 8 700 4.00 13 620 4.35 16 810 4.49 20 550 4.62 24 900 4.74 29 910 4.85 35 620 4.98 - - - -
30 7 720 4.89 12 350 5.29 15 320 5.46 18 780 5.61 22 790 5.74 27 400 5.88 32 650 6.02 38 610 6.17 45 310 6.34
40 6 700 5.82 10 950 6.26 13 640 6.44 16 770 6.61 20 390 6.76 24 550 6.91 29 310 7.06 34 700 7. 22 40 780 7. 39
50 5 620 7.00 9 400 7.46 11 760 7.65 14 510 7. 83 17 700 7.99 21 360 8.14 25 560 8.30 30 350 8.46 35 760 8.63
60 - - 7 670 9.09 9 660 9.29 11 980 9.47 14 680 9.63 17 800 9.78 21 410 9.94 25 530 10.10 30 230 10.27
68 ------9 750 11.22 12 020 11.3 8 14 680 11.53 17 770 11.68 21 330 11. 83 25 430 11.99
PSH023-4
20 10 290 4.81 16 020 5.02 19 740 5.16 24 110 5.33 29 180 5.54 35 020 5.79 41 670 6.10 ----
30 9 210 5.80 14 640 6.00 18 110 6.12 22 160 6.27 26 850 6.45 32 230 6.67 38 370 6.92 45 330 7. 23 53 160 7.59
40 8 080 7.02 13 090 7.23 16 250 7. 35 19 930 7.4 8 24 170 7.6 4 29 050 7.82 34 620 8.04 40 930 8.31 48 060 8.62
50 6 860 8.54 11 34 0 8.78 14 130 8.90 17 370 9.03 21 120 9.18 25 430 9.34 30 370 9.54 35 990 9.76 42 350 10.03
60 - - 9 350 10.72 11 720 10.86 14 470 11.00 17 660 11.14 21 350 11. 30 25 600 11.48 30 460 11. 68 36 000 11.91
68 ------11 8 80 12.92 14 580 13.07 17 730 13.23 21 390 13.40 25 600 13.59 30 450 13.81
PSH026-4
20 11 670 5.40 18 260 5.67 22 560 5.83 27 620 6.03 33 510 6.27 40 300 6.57 48 050 6.94 - - - -
30 10 400 6.52 16 610 6.75 20 610 6.88 25 290 7.0 4 30 730 7.23 36 980 7.47 4 4 120 7.76 52 210 8.13 61 330 8.57
40 9 050 7.95 14 750 8.17 18 370 8.28 22 610 8.40 27 510 8.55 33 160 8.73 39 620 8.95 46 960 9.24 55 240 9.59
50 7 600 9.80 12 650 10.02 15 830 10.11 19 540 10.20 23 850 10.31 28 830 10.44 34 540 10.61 41 050 10.82 48 420 11. 09
60 - - 10 290 12.38 12 960 12.46 16 090 12.54 19 730 12.61 23 960 12.70 28 850 12.81 34 460 12.96 40 860 13.16
68 ------13 030 14.84 16 090 14.90 19 670 14.96 23 860 15.03 28 700 15.14 34 270 15.28
PSH030-4
20 13 780 5.98 21 300 6.25 26 190 6.44 31 920 6.71 38 570 7.06 46 210 7. 51 54 930 8.08 ----
30 12 240 7.26 19 280 7.48 23 780 7.63 29 040 7. 83 35 130 8.09 42 120 8.44 50 090 8.89 59 120 9.45 69 270 10.15
40 10 670 8.85 17 110 9.06 21 170 9.18 25 910 9.34 31 380 9.54 37 670 9.81 44 840 10.16 52 980 10.61 62 160 11.17
50 8 990 10.84 14 720 11.09 18 300 11.21 22 460 11.3 4 27 260 11. 50 32 790 11.71 39 120 11.99 46 320 12.35 54 460 12.80
60 - - 12 070 13.65 15 110 13.79 18 630 13.92 22 710 14.07 27 430 14.24 32 850 14.47 39 050 14.75 46 120 15.12
68 ------15 250 16.46 18 710 16.61 22 740 16.78 27 400 16.97 32 770 17.22 38 930 17.53
PSH034-4
20 15 400 6.67 23 950 6.99 29 530 7. 24 36 080 7.57 43 680 7.99 52 430 8.53 62 400 9.20 ----
30 13 590 8.16 21 680 8.39 26 860 8.57 32 900 8.81 39 900 9.14 47 920 9.56 57 060 10.09 67 400 10.76 79 020 11.57
40 11 80 0 10.03 19 260 10.21 23 960 10.34 29 420 10.51 35 720 10.75 42 950 11.07 51 180 11.49 60 500 12.02 70 990 12.68
50 9 910 12.43 16 590 12.60 20 730 12.69 25 530 12.81 31 060 12.98 37 410 13.22 44 650 13.54 52 870 13.95 62 160 14.48
60 - - 13 580 15.70 17 090 15.77 21 140 15.86 25 820 15.98 31 210 16.15 37 380 16.38 44 430 16.69 52 440 17.10
68 ------17 220 18.94 21 160 19.03 25 720 19.15 30 980 19.33 37 030 19.57 43 950 19.90
PSH039-4
20 17 880 7.41 27 450 7.90 33 630 8.20 40 880 8.54 49 280 8.94 58 930 9.41 69 930 9.97 ----
30 15 910 8.92 24 920 9.39 30 660 9.66 37 350 9.96 45 080 10.31 53 950 10.71 64 060 11.19 75 500 11.75 88 360 12.41
40 13 830 10.84 22 120 11. 31 27 330 11.56 33 370 11.84 40 350 12.14 48 360 12.49 57 490 12.90 67 840 13.39 79 510 13.95
50 11 60 0 13.27 18 990 13.78 23 580 14.02 28 900 14.28 35 040 14.56 42 100 14.87 50 160 15.23 59 340 15.64 69 720 16.12
60 - - 15 480 16.89 19 370 17.15 23 880 17.40 29 100 17.67 35 120 17.95 42 040 18.27 49 960 18.63 58 970 19.04
68 ------19 440 20.47 23 850 20.73 28 980 21.00 34 930 21.29 41 780 21.62 49 630 21.99
Te -30 -20 -15 -10 -5 0 5 10 15
Tc Heating
(W)
Pe
(kW)
Heating
(W)
Pe
(kW)
Heating
(W)
Pe
(kW)
Heating
(W)
Pe
(kW)
Heating
(W)
Pe
(kW)
Heating
(W)
Pe
(kW)
Heating
(W)
Pe
(kW)
Heating
(W)
Pe
(kW)
Heating
(W)
Pe
(kW)
PSH019-4
20 12 490 4.00 17 740 4.35 21 070 4.49 24 930 4.62 29 400 4.74 34 520 4.85 40 340 4.98 - - - -
30 12 360 4.89 17 370 5.29 20 490 5.46 24 100 5.61 28 240 5.74 32 980 5.88 38 360 6.02 44 460 6.17 51 320 6.34
40 12 230 5.82 16 890 6.26 19 760 6.44 23 040 6.61 26 810 6.76 31 110 6.91 36 000 7.0 6 41 550 7. 22 47 790 7.39
50 12 260 7.0 0 16 480 7.4 6 19 020 7.65 21 940 7. 83 25 270 7.99 29 090 8.14 33 430 8.30 38 370 8.46 43 950 8.63
60 - - 16 290 9.09 18 470 9.29 20 960 9.47 23 820 9.63 27 090 9.78 30 830 9.94 35 110 10.10 39 980 10.27
68 ------20 390 11.22 22 820 11.38 25 620 11.53 28 850 11. 68 32 560 11.83 36 810 11.99
PSH023-4
20 14 880 4.81 20 810 5.02 24 660 5.16 29 190 5.33 34 460 5.54 40 540 5.79 47 480 6.10 ----
30 14 740 5.80 20 360 6.00 23 950 6.12 28 140 6.27 33 000 6.45 38 590 6.67 44 970 6.92 52 220 7. 23 60 400 7. 59
40 14 770 7. 02 19 980 7. 23 23 260 7.35 27 060 7.4 8 31 450 7.6 4 36 510 7.82 42 290 8.04 48 850 8.31 56 270 8.62
50 15 000 8.54 19 710 8.78 22 620 8.90 25 980 9.03 29 870 9.18 34 340 9.34 39 460 9.54 45 300 9.76 51 910 10.03
60 - - 19 580 10.72 22 070 10.86 24 960 11.00 28 280 11.14 32 120 11.30 36 540 11.48 41 600 11.68 47 360 11.91
68 ------24 190 12.92 27 040 13.07 30 340 13.23 34 160 13.40 38 560 13.59 43 610 13.81
PSH026-4
20 16 920 5.40 23 770 5.67 28 230 5.83 33 480 6.03 39 610 6.27 46 690 6.57 54 810 6.94 - - - -
30 16 730 6.52 23 180 6.75 27 310 6.88 32 140 7.04 37 760 7.23 44 240 7.47 51 670 7.76 60 120 8.13 69 670 8.57
40 16 780 7.95 22 700 8.17 26 430 8.28 30 780 8.40 35 830 8.55 41 650 8.73 48 330 8.95 55 940 9.24 64 570 9.59
50 17 130 9.80 22 400 10.02 25 670 10.11 29 470 10.20 33 880 10.31 38 980 10.44 44 850 10.61 51 570 10.82 59 210 11.09
60 - - 22 340 12.38 25 090 12.46 28 280 12.54 32 000 12.61 36 320 12.70 41 310 12.81 47 070 12.96 53 660 13.16
68 ------27 460 14.84 30 580 14.90 34 220 14.96 38 480 15.03 43 420 15.14 49 130 15.28
PSH030-4
20 19 410 5.98 27 180 6.25 32 250 6.44 38 240 6.71 45 220 7. 06 53 290 7. 51 62 540 8.08 ----
30 19 080 7. 26 26 320 7.4 8 30 960 7.63 36 410 7.83 42 750 8.09 50 070 8.44 58 460 8.89 68 020 9.45 78 830 10.15
40 19 000 8.85 25 640 9.06 29 820 9.18 34 700 9.34 40 370 9.54 46 910 9.81 54 410 10.16 62 970 10.61 72 680 11.17
50 19 190 10.84 25 170 11.09 28 860 11.21 33 140 11.34 38 100 11. 50 43 820 11.71 50 410 11.99 57 940 12.35 66 520 12.80
60 - - 24 920 13.65 28 090 13.79 31 740 13.92 35 960 14.07 40 840 14.24 46 470 14.47 52 950 14.75 60 350 15.12
68 ------30 750 16.46 34 360 16.61 38 540 16.78 43 390 16.97 48 990 17.22 55 440 17. 53
PSH034-4
20 21 570 6.67 30 420 6.99 36 220 7.24 43 070 7.57 51 070 7.99 60 320 8.53 70 910 9.20 ----
30 21 140 8.16 29 440 8.39 34 780 8.57 41 050 8.81 48 350 9.14 56 760 9.56 66 400 10.09 77 350 10.76 89 720 11. 57
40 21 070 10.03 28 700 10.21 33 520 10.34 39 140 10.51 45 660 10.75 53 180 11.07 61 800 11.49 71 610 12.02 82 720 12.68
50 21 410 12.43 28 230 12.60 32 470 12.69 37 380 12.81 43 070 12.98 49 630 13. 22 57 170 13.54 65 770 13.95 75 550 14.48
60 - - 28 090 15.70 31 680 15.77 35 810 15.86 40 600 15.98 46 140 16.15 52 530 16.38 59 870 16.69 68 250 17.10
68 - - - - - - 34 730 18.94 38 760 19.03 43 430 19.15 48 860 19.33 55 130 19.57 62 350 19.90
PSH039-4
20 25 070 7. 41 35 120 7.90 41 590 8.20 49 160 8.54 57 950 8.94 68 060 9.41 79 600 9.97 ----
30 24 560 8.92 34 040 9.39 40 030 9.66 47 010 9.96 55 080 10.31 64 350 10.71 74 920 11.19 86 900 11.75 100 400 12.41
40 24 340 10.84 33 100 11.31 38 550 11.56 44 850 11.8 4 52 130 12.14 60 480 12.49 70 010 12.90 80 830 13. 39 93 040 13.95
50 24 470 13.27 32 360 13.78 37 190 14.02 42 750 14.28 49 160 14.56 56 520 14.87 64 940 15.23 74 520 15.64 85 370 16.12
60 - - 31 870 16.89 36 010 17.15 40 770 17.40 46 240 17.67 52 530 17.95 59 760 18.27 68 030 18.63 77 450 19.04
68 ------39 290 20.47 43 960 20.73 49 360 21.00 55 580 21.29 62 750 21.62 70 970 21.99
Refrigerant: R410A Frequency 60 Hz Subcooling: 4K Superheat: 5K
Subject to modication without prior notication. For full data details and capacity table, refer to Online Datasheet Generator: www.danfoss.com/odsg
7FRCC.PC.022.A4.02
Application Guidelines

Dimensions
PSH019
15 mm
HM 8 bolt
L
ock washer
F
lat washer
S
teel mounting
slee
ve
Rubber
grommet
Nut
Mounting grommet
Ø224
Ø245
4 hole
Ø19.05
Ø32 oil equalisation
1.75”-12 UN-2A
230 (2x)
230
(2x)
190.5 (2x)
190.5
(2x)
121
206
154
158
30°±1°
30°±0.5°
60°±1°
Ø220.8
Discharge 7/8”
Suction
1”1/8
Ø32 oil
equalisation
Liquid injection
Ø8
41
436
377
469.7
±3
190
219.5
Without compression
15.25
101
78.7
8FRCC.PC.022.A4.02
Application Guidelines

Dimensions
PSH023-026-030-034
15 mm
HM 8 bolt
Lock washer
F
lat washer
Steel mounting
sleeve
Rubber grommet
Nut
Mounting grommet
Ø224
Ø221
493.5
Ø243
4 x hole Ø19.05
Ø245
Ø32 oil equalisation
1.75” - 12 UN - 2A
230 (x2)
230
(x2)
190.5 (x2)
190.5
(x2)
Suction 1”3/8
Discharge 7/8”
41
190
435
148
86
121
207
154
173
527.2
±3
30°±0.5°
30°±1°
60°±1°
262.5
15.25
(Without compression)
Liquid injection Ø8
9FRCC.PC.022.A4.02
Application Guidelines

Dimensions
PSH039
15 mm
HM 8 bolt
L
ock washer
F
lat washer
S
teel mounting
slee
ve
Rubber
grommet
Nut
Mounting grommet
Ø 234
Liquid injection Ø8
Discharge 7/8”
509
Ø 232.1
Ø 243
Ø 245
Ø 32 Oil equalisation
1.75” - 12 UN - 2A
15.25
(without compression)
Suction 1”3/8
42
190
450
542.7
±3
284
230 (2x)
230
(2x)
190.5 (2x)
190.5
(2x)
127
206
159
173
30° ±1°
30° ±0.5°
60° ±1°
163
92.5
10 FRCC.PC.022.A4.02
Application Guidelines

Electrical data, connections and wiring
All Danfoss PSH scroll compressors come
equipped with a sight glass (1”1/8 - 18 UNF)
which may be used to determine the amount and
condition of the oil contained within the sump.
Connection Details PSH019-023-026-030-034-039
Bare compressor version Full package version
Suction and discharge connections Brazed Brazed
Oil sight glass Threaded Threaded
Oil equalization connection Rotolock 1”3/4 Rotolock 1”3/4
Oil drain connection none none
Low pressure gauge port (shrader) ¼” are ¼” are
Liquid Injection valve connection none 5/16”ODF
Brazed version
Tube ODF
PSH019 Suction 1”1/8
Discharge 7/8”
PSH023-026-030-034-039 Suction 1”3/8
Discharge 7/8”
Suction and discharge
connections
Oil sight glass
Oil equalisation
connection
PSH019-023-026-030-034-039 are equipped
with a 1”3/4 rotolock connector allowing the
use of 1”3/4 - 7/8” or 1”3/4 - 1”1/8 sleeve. This
connection must be used to mount the oil
equalisation line when two or more compressors
are mounted in parallel.
The oil ll connection and gauge port is a 1/4”
male are connector incorporating a Schrader
valve.
Schrader
Liquid injection valve The liquid injection valve comes equipped
with process tube, maintained by a bracket,
assembled on compressor shell. This process tube
is to be connected with a 5/16”piping.
Danfoss PSH scroll compressor is optimized
for heat pump applications. Scroll elements
pressure ratio optimization and liquid injection
management system is developed for extreme
conditions running.
PSH Scroll compressor is also equipped
with several pre-wired devices that enhance
compressor reliability.
Liquid injection is controlled by discharge gas
temperature sensor plugged to the control board
placed in the terminal box.
Note: PSH bare compressor version is not
equipped with liquid injection valve.
Coil
Support brackets
Pipe OD
diameter 5/16”
Liquid Injection
Valve (LIV)
Process tube
Terminal box with
control board
Liquid injection
auto control
11FRCC.PC.022.A4.02
Application Guidelines

Electrical data, connections and wiring
The operating voltage limits are shown in the
table section “Motor voltage”. The voltage applied
to the motor terminals must lie within these
table limits during both start-up and normal
operations. The maximum allowable voltage
imbalance is 2%. Voltage imbalance causes high
amperage over one or several phases, which in
turn leads to overheating and possible motor
damage. Voltage imbalance is given by the
formula:
Motor voltage
Voltage imbalance
Electrical data
Compressor models LRA MCC Maximum Operating
Current Winding resistance
A A A Ω
Motor code 3
PSH019 203 43 38 0.39
PSH023 267 46 45 0.27
PSH026 267 61 48 0.27
PSH030 304 64 56 0.24
PSH034 315 69 64 0.22
PSH039 351 75 71 0.22
Motor code 4
PSH019 98 20 19 1.47
PSH023 142 23 22 1.05
PSH026 142 29 24 1.05
PSH030 147 30 28 0.92
PSH034 158 33 31 0.83
PSH039 197 38.6 36 0.83
Motor code 9
PSH019 124 26 23 1.05
PSH023 160 30 26 0.72
PSH026 160 35 29 0.72
PSH030 168 37 33 0.62
PSH034 177 41 37 0.57
PSH039 239 51 44 0.57
| Vavg - V1-2 | + | Vavg - V1-3 | + | Vavg - V2-3 |
% voltage imbalance= __________________________________________________ x100
2 x Vavg
Motor voltage code Code 3 Code 4 Code 9
50 Hz
Nominal voltage - 380-400V - 3 ph -
Voltage range -340-440 V -
60 Hz
Nominal voltage 200-230V - 3 ph 460V - 3 ph 380V- 3 ph
Voltage range 180-253 V 414-506 V 342-418 V
Vavg = Mean voltage of phases 1, 2, 3
V1-2 = Voltage between phases 1 & 2
V1-3 = Voltage between phases 1 & 3
V2-3 = Voltage between phases 2 & 3
12 FRCC.PC.022.A4.02
Application Guidelines

Electrical data, connections and wiring
CC
L1 L2 L3
KM
Q1
A1
A2
DGT
HP
KS
KSKA KA
KA
LPS
LPS
KA
KS
KM
A3
180s
OCS
M
T3
T1 T2
F1F1
Locked Rotor Amp value is the highest average
current as measured on mechanically blocked
compressor tested under nominal voltage. The
LRA value can be used as rough estimation for
the starting current. However in most cases, the
real starting current will be lower. A soft starter
can be applied to reduce starting current.
The MCC is the current at which the motor
protection trips under maximum load and
low voltage conditions. This MCC value is the
maximum at which the compressor can be
operated in transient conditions and out of the
application envelope.
The wiring diagram below is example for a
safe and reliable compressor wiring. In case
an alternative wiring logic is chosen, it is
imperative to respect the following rules: when
a safety switch trips, the compressor must stop
immediately and must not re-start until tripping
condition is back to normal and the safety switch
is closed again. This applies to the LP safety
switch, the HP safety switch, the discharge gas
thermostat and the motor safety thermostat.
Winding resistance is the resistance between
phases at 25°C (resistance value +/- 7%).
Winding resistance is generally low and it
requires adapted tools for precise measurement.
Use a digital ohm-meter, a “4 wires” method and
measure under stabilised ambient temperature.
Winding resistance varies strongly with winding
temperature; if the compressor is stabilised
at a dierent value than 25°C, the measured
resistance must be corrected with following
formula:
a + tamb
Ramb = R25°C _____________
a + t25°C
t25°C : reference temperature = 25°C
tamb: temperature during measurement (°C)
R25°C: winding resistance at 25°C
Ramb: winding resistance at tamb
Coecient a = 234.5
The max. operating current is the current when
the compressors operates at maximum load
conditions and 10% below nominal voltage
(+15°C evaporating temperature and +68°C
condensing temperature). Max Oper. Current can
be used to select cables and contactors.
In normal operation, the compressor current
consumption is always less than the Max Oper.
A.value.
LRA (Locked Rotor Amp)
MCC (Maximum
Continuous Current)
Max. operating Current
Winding resistance
General wiring
information
Legend:
Fuses .................................................................... F1
Compressor contactor .................................. KM
Control relay ..................................................... KA
Safety lock out relay ........................................KS
Optional short cycle timer (3 min) ......... 180 s
High pressure safety switch.......................... HP
Fused disconnect............................................. Q1
Compressor motor............................................M
Discharge gas temperature....................... DGT
Safety pressure switch...................................LPS
Control circuit ...................................................CC
Operating Control System ..........................OCS
13FRCC.PC.022.A4.02
Application Guidelines

Electrical data, connections and wiring
Wiring Connections Electrical supply is connected to the compressor
terminals by Ø 4.8 mm (3/16”) screws. The
maximum tightening torque is 3 Nm. Use a ¼”
ring terminal on the power leads. The compressor
must be connected to earth with the 5mm earth
terminal screw.
The control board comes pre-installed within
the terminal box of full package compressor.
The control board comes with pre-wired liquid
injection valve connection, is used to provide
control of liquid injection valve according to
feedback of discharge temperature sensor.
The discharge gas temperature cable must be
plugged to the discharge temperature sensor
installed on discharge tube by customer.
The control board must be connected to:
• a power supply of the appropriate voltage
(230VAC) with a 2 poles 7.62 mm pitch
terminal block (an independent power
supply is recommended).
• a 1/4” fasten earth connection for 230V
supply models.
Plug and unplug connector on board with
electricity is forbidden. Never touch board with
electricity by hand or tool. Cable connected to
control board can not be short circuit or connect
to high voltage.
IP Rating The compressor terminal box according to IEC529 is IP54 for all models when correctly sized IP54 rated
cable glands are used.
First numeral, level of protection against contact and foreign object
5- Dust protected
Second numeral, level of protection against water
4- Protection against water splashing
control board power
supply
liquid injection valve
control (pre-wired)
discharge temperature
sensor PT1000
main power supply Liquid injection valve
control
14 FRCC.PC.022.A4.02
Application Guidelines

Electrical data, connections and wiring
The temperature inside the terminal box may not
exceed 70°C. Consequently, if the compressor is
installed in an enclosure, precautions must be
taken to avoid that the temperature around the
compressor and in the terminal box would rise
too much. The installation of ventilation on the
enclosure panels may be necessary. If not, the
control board may not operate properly. Any
compressor damaged related to this will not
be covered by Danfoss warranty. In the same
manner, cables must be selected in a way to
insure that terminal box temperature does not
exceed 70°C.
The compressors models PSH019-023-026-030-
034-039 have been provided with an internal
overload protection to prevent against excessive
current and temperature caused by overloading,
low refrigerant ow or phase loss. The cutout
current is the MCC value listed before.
The protector is located in the star point of the
motor and, should it be activated, will cut out all
three phases. It will be reset automatically. While
not compulsory, an additional external overload
is still advisable for either alarm or manual reset.
Then it must be set below MCC value:
• When the motor temperature is too high, then
the internal protector will trip.
• When the current is too high the external
overload protection will trip before the internal
protection therefore oering possibility of
manual reset.
Use a phase meter to establish the phase
orders and connect line phased L1, L2 and L3
to terminals T1, T2 and T3, respectively. The
compressor will only operate properly in a single
direction, and the motor is wound so that if the
connection is correct, the rotation will also be
correct.
The compressor models PSH019-023-026-
030-034-039 incorporate an internal reverse
vent valve which will react in the presence of
reverse rotation and will allow refrigerant to
circulate through a by-pass from the suction
to the discharge. Although reverse rotation is
not destructive for these models, it should be
corrected as soon as possible. Reverse rotation
will be obvious to the user as soon as power
is turned on, the compressor will not build up
pressure, the sound level will be abnormally
high and power consumption will be minimal.
If reverse rotation symptoms occur, shut the
compressor down and connect the phases to
their proper terminals. If reverse rotation is not
halted, the compressor will cycle o on the motor
protection.
Terminal box
temperature
Terminal box knock-out
dimensions
Compressor protection
The terminal box is provided with a Ø 25.5 mm
knockout for main power supply and a sealed
hole for other wirings to control board.
Motor protection
Compressor model Overheating protection Over current protection Locked rotor protection Phase reversal protection
PSH019-023-026-030-034-039 Internal motor protection Internal reverse vent valve
Phase sequence and reverse
rotation protection
15FRCC.PC.022.A4.02
Application Guidelines

Approvals and certicates
PSH scroll compressors comply with the
following approvals and certicates.
Certicates are listed on the product datasheets:
http://www.danfoss.com/odsg
Approvals and
certicates
Pressure Equipment
Machines directive
2006/42/EC
Low voltage directive
Internal free volume
Directive 97/23/EC
2006/95/EC
CE 0062 or CE 0038 or CE0871
(European Directive) All PSH models
UL
(Underwriters Laboratories) All 60 Hz PSH models
Other approvals / certicates Contact Danfoss
Products PSH019 to 039
Manufacturer's declaration of incorporation
ref. Machines Directive 2006/42/EC Contact Danfoss
Products PSH019 to 039
Declaration of conformity
ref. Low voltage Directive 2006/95/EC Contact Danfoss
Products Internal free volume without oil (litre)
PSH019 12.4
PSH023-026-030-034 14.3
PSH039 14.6
Products PSH019 to 039
Refrigerating uids Group 2
Category PED II
Evaluation module D1
Service temperature - Ts -35°C < Ts < 55°C
Service pressure - Ps 33.3 bar(g)
Declaration of conformity contact Danfoss
16 FRCC.PC.022.A4.02
Application Guidelines

Operating conditions
PSH compressors are to be used with R410A refrigerant,with polyolester oil.
• R410A’s superior thermodynamical properties
compared to R22 and R407C refrigerants allow for
today’s massive – and necessary – switch to high
eciency systems.
• Zero Ozone Depletion Potential (ODP): R410A
doesn’t harm the ozone layer.
• Global warming potential (GWP): R410A shows
a relatively high warming potential. However, the
GWP index denotes direct warming eect,which
is relevant only in case of release to the
atmosphere.
A more accurate index is T.E.W.I., for Total
Equivalent Warming Impact, which takes into
account indirect contributions due to running
energy costs.
• Because of the higher system eciency it
allows to achieve, R410A is in this regard the best
refrigerant.
• As a near-azeotropic mixture, refrigerant R410A
behaves like an homogeneous substance,
whereas other zeotropic mixtures such as
R407C and other blends suer a temperature
glide during phase change that lessens thermal
eciency and makes them dicult to transfer
from a container to another.
• Reduced refrigerant mass ow, permitted by a
higher heat capacity, induce a lower sound level
of the installation as well as more compact and
lighter systems.
Polyolester oil (POE) is miscible with HFC’s (while
mineral oil is not), but has to be evaluated
regarding lubrication ability in compressors. POE
oil has better thermal stability than refrigerant
mineral oil.
POE is more hygroscopic and also holds moisture
tighter than mineral oil. It also chemically reacts
with water leading to acid and alcohol formation.
PSH scroll compressors can be operated at
nominal voltages as indicated in the section
“Motor voltage”. Under-voltage and over-voltage
operation is allowed within the indicated voltage
ranges. In case of risk of under-voltage operation,
special attention must be paid to current draw.
PSH compressors can be applied from -35°C
to 51°C ambient temperature, when charged
with refrigerant. The compressors are designed
as 100% suction gas cooled without need for
additional fan cooling. Ambient temperature has
very little eect on the compressor performance.
In case of enclosed tting and high ambient
temperature it’s recommend to check the
temperature of power wires and conformity
to their insulation specication. In case of safe
tripping by the internal compressor overload
protection the compressor must cool down
before the overload will reset. A high ambient
temperature can strongly delay this cool-down
process.
Although the compressor itself can withstand
low ambient temperature, the system may
require specic design features to ensure safe
and reliable operation. See section ‘Specic
application recommendations’.
Refrigerant and
lubricants
R410A
POE oil
Motor supply
Compressor ambient
temperature
High ambient temperature
Low ambient temperature
17FRCC.PC.022.A4.02
Application Guidelines

Operating conditions
Continuous operations beyond the compressor’s
operating envelope will cause serious damage
to the compressor. In this case, an additional
discharge gas temperature protection device is
required for compressor protection.
The discharge gas temperature protection device
must be attached to the discharge line within
150mm from the compressor discharge port and
must be thermally insulated and tightly xed on
the discharge pipe.
The protection setting value should be 135°C, to
shut down the compressor when the measured
temperature reach this value.
Discharge temperature
protection
The operating envelope for PSH scroll
compressors is given in the gure below, where
the condensing and evaporating temperatures
represent the range for steady-state operation.
The operating limits serve to dene the
envelope within which reliable operations of the
compressor are guaranteed:
• Maximum discharge gas temperature: +135°C
• A suction superheat below 5 K is not allowed
due to the risk of liquid ood back,
• Maximum suction superheat of 20K
• A subcooling below 4K is not recommended to
ensure proper liquid injection,
• Minimum and maximum evaporating and
condensing temperatures as per the operating
envelopes.
Application envelope
10
20
30
40
50
60
70
Condensing temperature (°C)
Heating
SH5K
-35 -30 -20 -10 0 10 20-25 -15 -5 5 15 25
Evaporating temperature (°C)
High and low pressure
protection
A high pressure (HP) safety switch is required to
shut down the compressor should the discharge
pressure exceed the values shown in the table
below. 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 high-
pressure limit. If a discharge valve is used, the HP
switch must be connected to the service valve
gauge port, which must not be isolated.
High pressure
18 FRCC.PC.022.A4.02
Application Guidelines

Operating conditions
Note that these two dierent low pressure
switches require dierent setting. The low
pressure pump down switch setting must
always be within the operating envelope, for
example 2.3 bar for R410A. The compressor can
be operated full time under such condition. The
minimum low pressure safety switch setting
may be outside the normal operating envelope
and should only be reached in exceptional
(emergency) situations, for example 1.5 bar for
R410A.
A low-pressure (LP) safety switch must be used.
Deep vacuum operation of a scroll compressor
can cause internal electrical arcing and scroll
instability. Danfoss PSH scroll compressor exhibit
high volumetric eciency and may draw very
low vacuum levels, which could induce such
a problem. The minimum low pressure 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 switch tolerance must not
allow for vacuum operations of the compressors.
LP switch setting for pump down cycles with
automatic reset are also listed in the table below.
Low pressure
Pressure settings bar(g) R410A
Working pressure range high side 13.5-44.5
Working pressure range low side 1.7-15.5
Maximum high pressure safety switch setting 45
Minimum low pressure safety switch setting* 1.5
Minimum low pressure pump-down switch setting** 1.7
*LP safety switch shall never be bypassed and shall have no time delay.
**Recommended pump-down switch setting: 1.5 bar below nominal evaporating pressure with minimum of 2.3 bar(g).
Danfoss PSH requires liquid injection to maintain
suciently low discharge gas temperature in the
operating envelope. The PSH compressors are
provided with a liquid injection connection.
Refrigerant in liquid phase is directly injected
in the scroll set. The Liquid Injection Valve
is activated according to the discharge
temperature.
Liquid injection is active for when discharge
temperature exceed 121°C and will regulate to
keep constant this discharge temperature.
The discharge temperature sensor must use
PT1000. The discharge temperature sensor
must have a quick response, be attached on the
surface of discharge pipe within 40mm away
from compressor discharge tting, the sensor
should be xed by a metallic collar, have a good
thermal contact by adding thermal paste and be
insulated from ambient disturbance by thermal
wrap.
A minimum 5K subcooling is necessary to ensure
correct liquid injection.
Liquid Injection
In(P)
Pc
Pi
Po
h (kJ/kg)
LIV
Sol V
Discharge T sensor
Control
Condenser
Filter drier
EXV
Evaporator
19FRCC.PC.022.A4.02
Application Guidelines

Operating conditions
Cycle rate limit Danfoss recommends a restart delay timer to
limit compressor cycling. The timer prevents
reverse compressor rotation, which may occur
during brief power interruptions. The system
must be designed in a way that guarantees
a minimum compressor running time of 2
minutes so as to provide for sucient motor
cooling after start-up along with proper oil
return. Note that the oil return may vary since it
depends upon system design. There must be no
more than 12starts per hour, a number higher
than 12reduces the service life of the motor-
compressor unit. A three-minute (180-sec) time
out is recommended.
T T
TH
T
H
KA
A1 A2 A3A1
180 s
A2 KA
~
~
Please contact Danfoss Technical Support for any deviation from this guideline.
The Liquid Injection Valve (LIV) is a UKV stepper
valve. This valve is closed when the compressors
is idle. An additional solenoid valve has to be
installed in case of power shortage to prevent
liquid entry to compressor when compressor is
o. Only one solenoid valve per unit is required.
Injection pick-up has to be done at the bottom
side of the liquid line piping and downstream the
lter dryer.
A lter is required before liquid injection pipe in
order to avoid debris blocking liquid injection
pipe.
A minimum 4k subcooling is necessary to ensure
good liquid injection.
20 FRCC.PC.022.A4.02
Application Guidelines