A vertical ultra-low temperature freezer from the TwinCool Frequency Conversion series, designed for the storage of high-value biological samples — viruses, blood cells, bacteria, tissue, genetic material —, electronics, and other special materials. Combining frequency conversion (inverter) compressors, hydrocarbon (HC) refrigerant, and dual independent refrigeration system technology, the series delivers maximum sample security, world-leading energy efficiency, and environmental sustainability across three models with capacities of 578 L, 728 L, and 828 L — all certified CE, UL, and ENERGY STAR.

The dual independent refrigeration system is the series' primary safety differentiator: two HC systems operate independently and alternately, each individually capable of maintaining −80°C. If one system fails, the other automatically takes over temperature maintenance — fully protecting stored samples without requiring immediate intervention. The DW-86L728BPST achieves pull-down to −80°C in just 240 minutes from a 25°C ambient, with rapid temperature recovery to −75°C within 30 minutes after a 1-minute door opening.

Intelligent frequency conversion technology combined with the HC refrigeration system delivers a 50% reduction in energy consumption compared to traditional HFC systems — positioning the series among the most energy-efficient in the category, with consumption values of 7.0 kWh/day (578 L), 8.4 kWh/day (728 L), and 10.4 kWh/day (828 L). Temperature uniformity is ±3°C across the full −40°C to −86°C range, with a maximum storage capacity of 600 boxes (10×10 configuration, 2-inch boxes) — equivalent to 60,000 samples in the largest model.

The sealing structure is multi-layered: a triple gasket system distributed across the main door and inner doors minimizes heat ingress and guarantees excellent holdover time during power failure events. The 10.1-inch front touchscreen with high-precision interface displays temperature at 0.1°C resolution and features a complete alarm system — high temperature, low temperature, sensor error, hot condenser, power failure, low battery, door ajar, and high ambient temperature. The standard RS485 interface enables multi-freezer network connectivity, and the optional IoT system monitors operational status in real time via mobile app. HC refrigerant and LBA foam make the series completely free of high-GWP fluorinated compounds.

Technical Specifications

Key Features

• Dual independent HC refrigeration systems: each maintains −80°C individually with automatic switchover on failure

• 50% energy reduction versus traditional HFC refrigeration systems

• Pull-down to −80°C in 240 minutes from 25°C ambient (DW-86L728BPST); recovery to −75°C in 30 min after 1-min door opening

• Temperature uniformity ±3°C across the full −40°C to −86°C range

• Maximum capacity of 60,000 samples (600 × 2" boxes, 10×10 config, 828 L model)

• Full-voltage power supply 100–230 V / 50–60 Hz for global use

• Triple-layer gasket sealing for maximum thermal retention

• 10.1" touchscreen at 0.1°C resolution with 8-type complete alarm system

• Standard RS485 interface for multi-freezer network connectivity

• Optional IoT for real-time remote monitoring via mobile app

• Standard mechanical lock; optional electromagnetic lock, fingerprint, and NFC

• HC refrigerant + LBA foam: zero high-GWP fluorinated compounds

• CE / UL / ENERGY STAR certified across all three models

Applications

The TwinCool Frequency Conversion series is designed for hospitals, disease control centers, life sciences laboratories, medical research institutes, bioengineering centers, pharmaceutical companies, and other scientific laboratories requiring continuous, secure storage of high-value biological samples at −80°C. The dual refrigeration system redundancy makes the series especially suited for environments where sample loss due to equipment failure is unacceptable — such as biobanks, PCR laboratories, immunobiological production centers, and research facilities handling irreplaceable materials.

The three models (578 L, 728 L, and 828 L) allow scalability by sample volume, with RS485 network connectivity for centralized supervision of multiple units — ideal for large laboratories and R&D departments operating fleets of ULT freezers requiring unified monitoring.