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BITZER 2nd generation 2-stage tandem

Bitzer Semi hermetic 2-stage tandem S66H-40.2(Y)

Semi hermetic 2-stage tandem S66H-40.2(Y)

Tandem compressors are the simplest way of connecting two compressors in parallel. Turning on and shutting off one compressor allows for a particularly effective graduation of output. Particularly for applications with load fluctuations, this allows for cost-effective and energy-efficient operation under full- and part-load with all conventional refrigerants.

  • Displacement at 1450 min-1 : 2 x 73,6 (LP) 2 x 36,9 (HP)
  • Number of cylinders : 2x6
  • Oilcharge : 9,5 dm3

With liquid subcooling 50Hz (R404A/R507A)

Compressor type Cond.temp. Qo / Pe Evaporating temperature °C
[°C] -25 -30 -35 -40 -45 -50 -55 -60 -65 -70
S66H-40.2(Y) 30 Qo 63700 54900 46600 38900 31800 25500 20050 15390 11550 8470
Pe 32,85 30,04 27,29 24,60 22,01 19,51 17,13 14,87 12,79 10,80
35 Qo 62600 53900 45700 38050 31100 24950 18370 15110 11350 8280
Pe 34,94 31,90 28,94 26,08 23,32 20,66 18,13 15,72 13,45 11,32
40 Qo 61200 52700 44700 37200 30450 24450 19280 14840 11090
Pe 37,07 33,79 30,63 27,58 24,65 21,84 19,14 16,58 14,14
45 Qo 59800 51500 43650 36400 29850 24000 18940 14520
Pe 39,19 35,70 32,33 29,10 25,99 23,00 20,14 17,41
50 Qo 58700 50400 42700 35600 29250 23600 18560
Pe 41,26 37,57 34,02 30,59 27,30 24,14 21,10
55 Qo 49450 41800 34900 28700 23150
Pe 39,38 35,66 32,05 28,57 25,22

Qo - Cooling capacity [Watt], Pe - Power consumption [kW]

Without liquid subcooling 50Hz (R404A/R507A)

Compressor type Cond.temp. Qo / Pe Evaporating temperature °C
[°C] -25 -30 -35 -40 -45 -50 -55 -60 -65 -70
S66H-40.2(Y) 30 Qo 55400 46200 37900 30600 24200 18770 14250 10590 7700 5470
Pe 30,71 27,38 24,30 21,46 18,88 16,55 14,47 12,64 11,05 9,72
35 Qo 52400 43600 35700 28700 22700 17590 13370 9950 7240 5110
Pe 32,08 28,65 25,46 22,51 19,80 17,34 15,12 13,14 11,41 9,93
40 Qo 49200 40800 33350 26800 21200 16430 12510 9310 6730
Pe 33,40 29,91 26,64 23,58 20,75 18,15 15,78 13,64 11,74
45 Qo 45800 37950 31000 24900 19690 15300 11650 8620
Pe 34,70 31,17 27,83 24,69 21,75 19,01 16,49 14,16
50 Qo 42250 34950 28550 23000 18190 14150 10730
Pe 36,00 32,43 29,04 25,84 22,81 19,95 17,27
55 Qo 38500 31900 26100 21000 16660 12930
Pe 37,32 33,70 30,28 27,04 23,95 21,00

Qo - Cooling capacity [Watt], Pe - Power consumption [kW]

Compressor type Displacement at 1450 min-1 Number of cylinders Oil charge Weight Pipe connections Motor Max. operating current Max. power consumption Starting current(lockedrotor)
LP HP DL SL
dm3 Kg mm pouce mm pouce Amp kW Amp. Y/YY
S66H-40.2(Y) 2 x 73,6 2 x 36,9 2 x 6 9,5 433 2 x 35 13/8 2 x 42 15/8 380 ..420YY/3/50
440 ..480 YY/3/60		 2 x 37 2 x 21,5 2 x 97/158