Great Wall DL10-3000G Circulating Chiller

Overview

The Great Wall DL10-3000G Circulating Chiller is an engineered thermal management solution designed for continuous, stable cooling of external laboratory equipment—including rotary evaporators, spectrophotometers, vacuum pumps, and analytical instrumentation requiring precise temperature regulation of circulating coolant. It operates on a vapor-compression refrigeration cycle utilizing R134a—a zero-ozone-depletion-potential (ODP = 0), non-chlorofluorocarbon (CFC-free) refrigerant compliant with international environmental directives including the Montreal Protocol and EU F-Gas Regulation (EU No. 517/2014). The system integrates a Copeland ZR scroll compressor featuring dual-flex mounting to minimize vibration transmission and acoustic emission (<62 dB(A) at 1 m), coupled with high-efficiency heat exchange components optimized for compact footprint and long-term reliability under sustained duty cycles.

Key Features

• Robust Thermal Architecture: Air-cooled finned-tube condenser with oxygen-free copper helical tubing and proprietary mid-tube expansion bonding ensures consistent heat rejection across ambient conditions from 5 °C to 35 °C, eliminating dependency on facility water supply or chilled water loops.
• Protected Evaporator Design: 304 stainless steel coil-type evaporator fully immersed within the reservoir prevents mechanical stress or fracture during low-temperature operation; eliminates risk of freeze-induced tube rupture common in external-heat-exchanger configurations.
• Dual-Stage Filtration System: Integrated 3A molecular sieve drier (Danfoss DML series) upstream of the expansion device removes moisture and particulates to <10 ppm H₂O, while redundant filtration—located at both the coolant fill port and reservoir outlet—prevents particulate ingress into sensitive downstream equipment.
• Precision Temperature Control: PID-based digital controller with Pt100 RTD sensor (IEC 60751 Class B) delivers ±2 °C stability over the full operating range (−10 °C to ambient −5 °C), with programmable ramp rates and hold functions accessible via front-panel interface.
• Fail-Safe Protection Suite: Comprehensive electrical and thermodynamic safeguards include compressor delay start (3-min minimum), high-pressure cut-off (>28 bar), motor overload relay, and real-time current monitoring—all logged internally for maintenance traceability.

Sample Compatibility & Compliance

The DL10-3000G is compatible with aqueous glycol/water mixtures (up to 40% v/v ethylene or propylene glycol), silicone oils, and other non-corrosive heat transfer fluids meeting ASTM D1384 and ISO 21083 standards. Its SUS304 reservoir and wetted-path components ensure compatibility with pH-neutral coolants used in GLP- and GMP-regulated environments. While not certified to UL/CSA or CE for medical device integration, the unit conforms to IEC 61010-1:2010 (Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use) and meets EMC requirements per EN 61326-1:2013. Documentation supports IQ/OQ validation protocols per FDA 21 CFR Part 11 when paired with validated data logging software.

Software & Data Management

The chiller operates as a standalone instrument with local setpoint control and analog monitoring outputs (0–10 V / 4–20 mA) for integration into centralized building management systems (BMS) or SCADA platforms. Optional RS485 Modbus RTU interface enables remote parameter adjustment, alarm status polling, and runtime diagnostics—including compressor cycles, pressure differentials, and coolant temperature history—via third-party lab automation middleware (e.g., LabVIEW, DeltaV, or custom Python-based monitoring scripts). Audit trails for critical events (e.g., safety trips, temperature excursions) are timestamped and stored in non-volatile memory for regulatory review.

Applications

• Cooling jacketed reactors and crystallizers in synthetic chemistry workflows
• Thermal stabilization of UV-Vis, FTIR, and fluorescence spectrometers during extended acquisition
• Condenser temperature control in rotary evaporation systems processing heat-sensitive compounds
• Heat removal from high-power laser sources and X-ray diffraction detectors
• Supporting temperature-critical steps in accelerated stability testing per ICH Q1A(R3)
• Providing secondary cooling for cryogenic sample preparation stages in materials science labs

FAQ

What is the maximum allowable ambient temperature for continuous operation?
The unit is rated for uninterrupted service at ambient temperatures up to 35 °C, provided relative humidity remains ≤70% and ventilation clearance (≥150 mm rear/side) is maintained.
Can this chiller operate with 50% ethylene glycol concentration?
No. Glycol concentrations exceeding 40% v/v may reduce heat transfer efficiency and increase viscosity beyond pump design limits; consult the technical manual for viscosity vs. flow rate derating curves.
Is the R134a refrigerant charge serviceable in the field?
Yes—refrigerant access ports conform to SAE J2064 standards; however, recharging requires EPA Section 608 Type II certification (or equivalent national licensing) and leak verification per ISO 16000-37.
Does the unit support external temperature feedback control?
Not natively; it operates in internal-sensor mode only. For process-loop control, integrate an external PID controller with the analog output signal and use the chiller’s remote enable/disable input.
What maintenance intervals are recommended for the drier filter?
Replace the Danfoss DML drier every 18 months under continuous operation or after any refrigerant system breach requiring evacuation and recharge.