Jianhu JH Constant Temperature and Humidity Control Unit

Overview

The Jianhu JH Constant Temperature and Humidity Control Unit is an engineered environmental control system designed for precision conditioning of indoor air in mission-critical technical spaces. It operates on the principle of integrated refrigeration-based dehumidification, electric resistance heating, and electrode-type steam humidification—coordinated via a microprocessor-based PID control algorithm. Unlike standalone HVAC units, the JH series delivers closed-loop regulation of both dry-bulb temperature and relative humidity (RH) under defined nominal operating conditions: 23°C dry-bulb / 17°C wet-bulb at the indoor air inlet, and 35°C dry-bulb / 24°C wet-bulb at the outdoor condenser side. This specification ensures stable thermal and moisture load management across variable ambient conditions, making it suitable for environments where drift beyond ±1°C temperature tolerance or ±5% RH deviation may compromise process integrity, material stability, or measurement repeatability.

Key Features

• Integrated tri-functional operation: simultaneous cooling, heating, and humidification/dehumidification within a single compact chassis
• Electrode-type steam humidifier as standard—provides rapid, controllable moisture delivery with low maintenance and no mineral carryover; optional ultrasonic or high-pressure mist systems available upon request
• Dual-stage refrigeration circuit with scroll compressor and microchannel condenser for enhanced efficiency and reliability under continuous duty cycles
• Intelligent PID controller with programmable setpoints, hysteresis adjustment, and real-time trend logging of temperature and RH values
• Modular design supporting ducted or free-blow configurations; compatible with external static pressure up to 300 Pa
• Internal auxiliary electric heater (1.5–3 kW range, model-dependent) for precise sub-ambient temperature compensation and frost protection during low-load operation

Sample Compatibility & Compliance

The JH unit is engineered for integration into controlled environments requiring long-term environmental stability—including cleanrooms (ISO Class 5–8), telecom equipment shelters, metrology laboratories, paper storage vaults, textile testing chambers, and semiconductor fabrication support zones. While not certified to UL 61010-1 or EN 60335-1 out-of-the-box, all electrical components comply with GB/T 19001 (equivalent to ISO 9001) manufacturing protocols. The control logic architecture supports audit-ready data logging when paired with optional RS485/Modbus RTU or BACnet MS/TP interfaces—enabling alignment with GLP-compliant facility monitoring systems and facilitating traceability per FDA 21 CFR Part 11 requirements when deployed in regulated pharmaceutical or medical device manufacturing settings.

Software & Data Management

The embedded controller features a 4.3-inch TFT LCD touchscreen interface with multilingual support (English, Chinese, Spanish). All operational parameters—including current setpoints, sensor readings, alarm history (with timestamps), and compressor/humidifier runtime—are stored locally for ≥30 days. Optional Ethernet connectivity enables remote monitoring via HTTP/HTTPS web server mode or integration into centralized building management systems (BMS). Data export is supported in CSV format via USB flash drive; no proprietary software installation is required. Firmware updates are performed offline using signed binary files to ensure system integrity and prevent unauthorized modification.

Applications

• Environmental conditioning of precision instrument rooms housing coordinate measuring machines (CMMs), interferometers, and electron microscopes
• Stabilization of humidity-sensitive production lines in cigarette manufacturing and tobacco leaf aging facilities
• Climate control for archival storage of hygroscopic documents, photographic film, and museum-grade artifacts
• Support infrastructure for EMC test chambers and RF anechoic rooms where condensation must be avoided
• Backup environmental assurance for pharmaceutical stability chambers (ICH Q1A–Q1E compliant storage validation)

FAQ

Is the JH unit suitable for unattended 24/7 operation?
Yes—the system includes dual redundant safety cutoffs (high-temperature limit switch and high-humidity shutoff), automatic defrost logic, and self-diagnostic routines that trigger audible/visual alarms prior to fault escalation.
Can the unit be integrated into an existing BMS network?
Yes—standard Modbus RTU over RS485 is provided; optional BACnet IP or LonWorks modules are available for seamless integration with Schneider EcoStruxure, Siemens Desigo, or Honeywell Enterprise Buildings Integrator platforms.
What maintenance intervals are recommended?
Compressor oil and refrigerant charge require verification every 24 months; electrode humidifier cartridges should be replaced annually or after 8,000 hours of cumulative runtime; air filters must be inspected quarterly and cleaned or replaced based on particulate loading.
Does the unit meet any international energy efficiency standards?
It complies with China’s GB 21455-2019 minimum energy performance standard (MEPS) for room air conditioners; full seasonal COP and EER metrics are available in the technical datasheet upon request.