Bitzer HSK / HSN semi-hermetic screw compressor (HS.85 series)

Bitzer HSN semi-hermetic screw compressor

Bitzer HSN semi-hermetic screw compressor for low temperature refrigeration, with economiser. 13 models in the HS.53 to HS.95 series, from 25.5 to 302 kW with R404A at −35 °C (39 to 241 HP). Choose your model below to see its specifications.

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SKU: N/A Category: COMPRESSORS

Description

Bitzer HSN semi-hermetic screw compressors are the low temperature version of the HS series: freezer rooms, freezing tunnels, cold stores and low temperature racks. Their discharge ports are adapted to the high pressure ratios of low temperature refrigeration, and they usually run with an economiser (ECO). With R404A, the range has 13 models, from HS.53 to HS.95, from 84 to 1,015 m³/h displacement and 25.5 to 302 kW at −35 °C evaporating.

The 13 HSN models with R404A

Model	Displacement 50 Hz	R404A −35 / 40 °C, ECO	Power input	COP	Steps	Max. current	HP	Weight
HSN5343-20	84 m³/h	25.5 kW	23.2 kW	1.09	100/90/55%	48 A	39	166 kg
HSN5353-25	100 m³/h	30.1 kW	26.3 kW	1.13	100/80/50%	52 A	45	169 kg
HSN5363-30	118 m³/h	34.9 kW	29.6 kW	1.16	100/75/45%	58 A	50	174 kg
HSN6451-40	140 m³/h	41.8 kW	33.2 kW	1.24	100/75/50%	65 A	57	234 kg
HSN6461-50	165 m³/h	48.3 kW	39 kW	1.22	100/75/45%	79 A	71	238 kg
HSN7451-60	192 m³/h	57.5 kW	48.9 kW	1.16	100/80/65%	98 A	88	297 kg
HSN7461-70	220 m³/h	65.9 kW	51.5 kW	1.27	100/75/60%	124 A	102	310 kg
HSN7471-75	250 m³/h	69.8 kW	55.5 kW	1.25	100/75/55%	144 A	116	326 kg
HSN8561-110	359 m³/h	95 kW	83.6 kW	1.12	100–50% stepless or 100/75/50%	217 A	171	565 kg
HSN8571-125	410 m³/h	114.4 kW	87.5 kW	1.29	100–50% stepless or 100/75/50%	226 A	179	575 kg
HSN8591-160	535 m³/h	142 kW	114.9 kW	1.22	100–50% stepless or 100/75/50%	305 A	241	610 kg
HSN9583-240	805 m³/h	247 kW	177.2 kW	1.35	100–25% stepless	on request	–	1,020 kg
HSN95103-280	1,015 m³/h	302 kW	216 kW	1.38	100–25% stepless	on request	–	1,100 kg

Capacities calculated with BITZER Software (version 7.2.1.1, November 2026) with R404A: evaporating −35 °C and condensing 40 °C at dew point, with economiser, 10 K suction gas superheat, no liquid subcooling (EN 12900), 50 Hz, full load. At these conditions, Bitzer specifies additional oil cooling. Maximum current and power: Bitzer catalogue values at 400 V, for selecting contactors, cables and fuses (HS.95: on request). Effective capacity steps of HS.53 to HS.74 are given by Bitzer at −35 / 40 °C without economiser. Horsepower (HP) is calculated from the maximum power consumption given by Bitzer (1 HP = 0.736 kW).

Key benefits

Economiser (ECO): part of the liquid is expanded in a heat exchanger and drawn in at intermediate pressure. The main liquid is subcooled: cooling capacity and COP rise markedly at low temperature.
Oil cooling by air, water or thermosyphon, or liquid injection (LI) with an adaptor, to control the discharge temperature.
Capacity control in steps on HS.53 to HS.74, by slider on HS.85, stepless from 100 to 25% on HS.95; automatic start unloading and frequency inverter from 20 to 60 Hz possible.
Parallel compounding up to 6 compressors (4 for HS.95), for large low temperature racks.
Other refrigerants: R507A and the lower-GWP R404A replacements, R448A, R449A, R452A, R407F, R454C or R455A, on selection.

Special versions

Bitzer also makes HSNP models for propane R290 and propene R1270, and HSKB booster compressors for the low stage of two-stage systems, down to −50 °C evaporating. Ask us for a selection.

Applications

Low temperature screw compressor racks, freezer rooms and freezing tunnels, frozen food stores, meat, fish and ice cream industry.

See also the Bitzer HSK (air conditioning, medium 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

Model	HSN5343-20 – 25.5 kW (R404A) – 39 HP, HSN5353-25 – 30.1 kW (R404A) – 45 HP, HSN5363-30 – 34.9 kW (R404A) – 50 HP, HSN6451-40 – 41.8 kW (R404A) – 57 HP, HSN6461-50 – 48.3 kW (R404A) – 71 HP, HSN7451-60 – 57.5 kW (R404A) – 88 HP, HSN7461-70 – 65.9 kW (R404A) – 102 HP, HSN7471-75 – 69.8 kW (R404A) – 116 HP, HSN8561-110 – 95 kW (R404A) – 171 HP, HSN8571-125 – 114.4 kW (R404A) – 179 HP, HSN8591-160 – 142 kW (R404A) – 241 HP, HSN9583-240 – 247 kW (R404A), HSN95103-280 – 302 kW (R404A)

Model

HSN5343-20 – 25.5 kW (R404A) – 39 HP, HSN5353-25 – 30.1 kW (R404A) – 45 HP, HSN5363-30 – 34.9 kW (R404A) – 50 HP, HSN6451-40 – 41.8 kW (R404A) – 57 HP, HSN6461-50 – 48.3 kW (R404A) – 71 HP, HSN7451-60 – 57.5 kW (R404A) – 88 HP, HSN7461-70 – 65.9 kW (R404A) – 102 HP, HSN7471-75 – 69.8 kW (R404A) – 116 HP, HSN8561-110 – 95 kW (R404A) – 171 HP, HSN8571-125 – 114.4 kW (R404A) – 179 HP, HSN8591-160 – 142 kW (R404A) – 241 HP, HSN9583-240 – 247 kW (R404A), HSN95103-280 – 302 kW (R404A)

Documentation

Official Bitzer documents:

Bitzer SP-100-6 brochure, HS.53 to HS.95 screw compressors (PDF, 10.7 MB): features, capacity control, application limits, technical data and dimensional drawings.
Bitzer SB-110-5 operating instructions (PDF in German, English and French, 8.3 MB): mounting, electrical connection, commissioning and maintenance of HS.53 to HS.95.

Bitzer publishes new editions on its HS series pages.