Bitzer HSK / HSN semi-hermetic screw compressor (HS.85 series)
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Two Frigo Indus water chillers with V-shaped condensers, installed under a shelter
Air-cooled water chiller, 20 to 1000 kW
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Bitzer HSK / HSN semi-hermetic screw compressor (HS.85 series)
Bitzer HSN semi-hermetic screw compressor

Bitzer HSK semi-hermetic screw compressor

Bitzer HSK semi-hermetic screw compressor for air conditioning, water chillers and medium temperature refrigeration. 13 models in the HS.53 to HS.85 series, from 65.7 to 433 kW with R407C (5 / 50 °C), i.e. 45 to 246 HP. Choose your model below to see its specifications.

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Description

Bitzer HSK semi-hermetic screw compressors are designed for air conditioning, water chillers, medium temperature refrigeration and heat pumps, in commercial, industrial and marine systems. With R407C, the range has 13 models in the HS.53, HS.64, HS.74 and HS.85 series, from 84 to 535 m³/h displacement at 50 Hz and 65.7 to 433 kW cooling capacity at 5 / 50 °C. They run alone or in parallel, up to 6 compressors per rack.

The 13 HSK models with R407C

Model Displacement 50 Hz R407C 5 / 50 °C Power input COP Steps Max. current HP Weight
HSK5343-30 84 m³/h 65.7 kW 24.3 kW 2.70 100/90/70% 52 A 45 170 kg
HSK5353-35 100 m³/h 79.2 kW 29 kW 2.73 100/85/60% 58 A 50 178 kg
HSK5363-40 118 m³/h 93.2 kW 32.9 kW 2.83 100/80/55% 66 A 57 183 kg
HSK6451-50 140 m³/h 116.3 kW 39.1 kW 2.98 100/85/60% 79 A 68 238 kg
HSK6461-60 165 m³/h 139.9 kW 47.7 kW 2.93 100/80/55% 98 A 88 246 kg
HSK7451-70 192 m³/h 167.2 kW 56.5 kW 2.96 100/75/45% 124 A 102 305 kg
HSK7461-80 220 m³/h 193.6 kW 62.9 kW 3.08 100/70/40% 144 A 116 314 kg
HSK7471-90 250 m³/h 212 kW 70 kW 3.03 100/60/40% 162 A 125 336 kg
HSK8551-110 315 m³/h 258 kW 84.3 kW 3.06 100–50% stepless or 100/75/50% 180 A 150 565 kg
HSK8561-125 359 m³/h 292 kW 92.3 kW 3.16 100–50% stepless or 100/75/50% 226 A 179 575 kg
HSK8571-140 410 m³/h 336 kW 108.2 kW 3.10 100–50% stepless or 100/75/50% 246 A 204 580 kg
HSK8581-160 470 m³/h 380 kW 122.2 kW 3.11 100–50% stepless or 100/75/50% 277 A 220 605 kg
HSK8591-180 535 m³/h 433 kW 137.8 kW 3.15 100–50% stepless or 100/75/50% 330 A 246 620 kg

Capacities calculated with BITZER Software (version 7.2.1.1, November 2026) with R407C: evaporating 5 °C and condensing 50 °C at dew point, 10 K suction gas superheat, no liquid subcooling (EN 12900), 50 Hz, full load, without economiser. At these conditions, Bitzer specifies additional oil cooling. Maximum current and power: Bitzer catalogue values at 400 V, for selecting contactors, cables and fuses. Effective capacity steps of HS.53 to HS.74 are given by Bitzer at −10 / 45 °C. Horsepower (HP) is calculated from the maximum power consumption given by Bitzer (1 HP = 0.736 kW).

Models available with R407C

With R407C, BITZER Software offers the 13 motor 1 HSK models of the HS.53 to HS.85 series. HS.95 HSK models, up to 1,015 m³/h, and motor 2 versions, optimised for low pressure refrigerants such as R134a and R1234yf, are available for other refrigerants: ask us for a selection.

Key benefits

  • Capacity control: by shifting the suction port in two steps on HS.53 to HS.74, by slider, stepless or in 3 steps, on HS.85. Automatic start unloading.
  • Frequency inverter: all HS compressors run from 20 to 60 Hz with a matching inverter, to follow the load closely.
  • Economiser (ECO): an economiser port increases cooling capacity and efficiency at high pressure ratios.
  • Robust design: rotors on roller bearings on both sides, check valve in the discharge chamber, integrated pressure relief valve to EN 12693, electronic compressor protection.
  • Simple oil circuit: no oil pump, oil is injected by the pressure difference; external oil separator and air-cooled, water-cooled or thermosyphon oil cooler.
  • Other refrigerants: R134a, R513A, R450A, R1234yf, R407A, R407F, R448A, R449A, R452A and R454C, on selection.

Applications

R407C screw water chillers, central air conditioning, screw compressor racks for cold stores and food industry, process cooling and heat pumps. For low temperature, see the Bitzer HSN compressors.

See also the Bitzer HSN (low temperature) and CSH compact (chillers) screw compressors.

Afric Froid and Bitzer screw compressors

Afric Froid supplies Bitzer screw compressors and builds them into its screw compressor racks, housed screw condensing units and screw water chillers. We provide installation, commissioning and after-sales service in Tunisia, Algeria, Senegal and Ivory Coast. Frigo Indus is ISO 9001:2015 certified by DQS for the design, manufacture, sale, installation and after-sales service of refrigeration machines. Tell us the refrigerant, the cooling capacity and the evaporating and condensing temperatures: we select the compressor with BITZER Software and send you a quote.

Additional information
ModelHSK5343-30 – 65.7 kW (R407C) – 45 HP, HSK5353-35 – 79.2 kW (R407C) – 50 HP, HSK5363-40 – 93.2 kW (R407C) – 57 HP, HSK6451-50 – 116.3 kW (R407C) – 68 HP, HSK6461-60 – 139.9 kW (R407C) – 88 HP, HSK7451-70 – 167.2 kW (R407C) – 102 HP, HSK7461-80 – 193.6 kW (R407C) – 116 HP, HSK7471-90 – 212 kW (R407C) – 125 HP, HSK8551-110 – 258 kW (R407C) – 150 HP, HSK8561-125 – 292 kW (R407C) – 179 HP, HSK8571-140 – 336 kW (R407C) – 204 HP, HSK8581-160 – 380 kW (R407C) – 220 HP, HSK8591-180 – 433 kW (R407C) – 246 HP
Documentation

Official Bitzer documents:

Bitzer publishes new editions on its HS series pages.