ZEDO ZD-8240C Cleanroom Dehumidifier

Overview

The ZEDO ZD-8240C Cleanroom Dehumidifier is an industrial-grade, compressor-driven dehumidification system engineered for precision humidity control in ISO Class 5–8 cleanrooms and controlled-environment laboratories. It operates on the principle of refrigerant-based condensation: ambient air is drawn across a cooled evaporator coil where moisture condenses and is removed as liquid water, while the dry, re-heated air is returned to the space. This thermodynamic process delivers stable, repeatable dehumidification performance under variable load conditions—critical for environments where relative humidity (RH) must be maintained within tight tolerances (e.g., 40–50% RH ±5%) to prevent electrostatic discharge (ESD), microbial growth, corrosion, photoresist instability, and particulate adhesion. Designed specifically for semiconductor fabrication, pharmaceutical manufacturing, precision optics assembly, and archival storage, the ZD-8240C integrates robust mechanical architecture with calibrated sensing and closed-loop feedback control to ensure compliance with GMP, ISO 14644, and USP environmental monitoring guidelines.

Key Features

• High-capacity dehumidification: 240 L/day (240 kg/day) output at 30 °C / 80% RH, validated per AHAM DH-1 standard test conditions.
• Scroll-type hermetic compressor from a globally certified OEM supplier, paired with R-410A refrigerant—offering high COP, low oil carryover, and zero ozone depletion potential (ODP = 0).
• Dual-centrifugal external-rotor blower system with aerodynamically optimized impellers, delivering uniform airflow distribution and minimizing turbulence-induced particle resuspension.
• Microprocessor-based controller with Japanese Shinjo capacitive hygrothermograph (±1.5% RH, ±0.3 °C accuracy), supporting programmable setpoints, hysteresis adjustment, and real-time RH/temperature logging.
• Enhanced heat exchanger featuring internally grooved copper tubing and hydrophilic aluminum fins—achieving >85% sensible heat ratio (SHR) and reduced frosting frequency during low-temperature operation.
• Comprehensive electrical protection suite including high/low pressure switches, thermal overload relays, phase failure detection, undervoltage lockout, and 3-minute anti-short-cycle delay for compressor longevity.
• Structural modularity: independent refrigeration and air-handling sections facilitate field serviceability without system isolation or refrigerant recovery.

Sample Compatibility & Compliance

The ZD-8240C is compatible with non-corrosive, non-explosive ambient airstreams typical of cleanroom recirculation systems (HEPA-filtered, ≤0.5 µm particle retention). It meets CE marking requirements for electromagnetic compatibility (EMC Directive 2014/30/EU) and low-voltage safety (LVD Directive 2014/35/EU). While not intrinsically rated for hazardous locations, its construction conforms to ISO 14644-1 airborne particle limits when installed downstream of terminal filtration. The unit supports audit-ready operation under FDA 21 CFR Part 11-compliant data management systems when integrated with optional RS485 Modbus RTU or Ethernet/IP interfaces. Its humidity control stability (±2.5% RH over 24 h at steady state) aligns with ICH Q5C recommendations for biologics storage environments and ASTM E1910-22 guidance for cleanroom environmental qualification.

Software & Data Management

The embedded controller provides local setpoint configuration via tactile membrane keypad and LCD display with multilingual UI (English, Chinese, Korean). Optional communication modules enable integration into BMS platforms via Modbus RTU (RS485) or Modbus TCP (Ethernet). Logged parameters—including actual RH, dry-bulb temperature, runtime hours, fault codes, and compressor cycle count—are timestamped and exportable as CSV files. When connected to a validated server environment, historical data supports trend analysis, preventive maintenance scheduling, and electronic record generation compliant with ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available). Audit trails capture all parameter changes, user logins, and alarm acknowledgments—fully traceable for GLP/GMP inspections.

Applications

• Semiconductor photolithography bays requiring RH control between 35–45% to stabilize photoresist viscosity, minimize swelling post-bake, and optimize HMDS priming efficiency.
• Pharmaceutical aseptic filling suites where RH >55% risks condensate formation on isolator windows and vial stopper adhesion anomalies.
• Precision metrology labs housing coordinate measuring machines (CMMs), laser interferometers, and electron microscopes—where thermal drift from moisture-laden air compromises dimensional repeatability.
• Medical device packaging cleanrooms (ISO 13485) preventing oxidation of stainless steel components and delamination of sterile barrier systems.
• Archival repositories (e.g., national libraries, museum conservation centers) maintaining RH ≤50% to inhibit cellulose hydrolysis in paper-based media and silver halide degradation in photographic emulsions.
• Optical coating facilities where uncontrolled humidity causes thin-film stress variation and spectral shift in interference filters.

FAQ

What is the minimum ambient temperature at which the ZD-8240C maintains rated dehumidification capacity?
The unit sustains ≥90% of nominal capacity down to 10 °C dry-bulb; below this, automatic defrost cycling initiates to prevent evaporator icing.
Can the ZD-8240C operate continuously in recirculation mode without fresh air intake?
Yes—its design assumes 100% internal air recirculation typical of cleanroom HVAC configurations; external air infiltration must be compensated by upstream AHU pre-conditioning.
Does the unit include validation documentation for IQ/OQ protocols?
Factory-supplied DQ/IQ templates and calibration certificates for the Shinjo sensor are provided; OQ execution requires site-specific testing per ISO 14644-3 Annex B.
Is the activated carbon filter replaceable, and what is its service life?
Yes—the standard filter is field-replaceable every 6–12 months depending on VOC loading; MERV-8 equivalent particulate retention is retained throughout its lifecycle.
How is condensate managed during unattended operation?
Continuous gravity drainage via 16 mm ID PVC hose is supported up to 5 m horizontal run or 1.5 m vertical lift; pump-assisted drainage is available as an accessory kit.