Electronic Steam Humidifier

Product catalog summary

Overview of Series EHU-700 Electronic Steam Humidifier
The Armstrong Series EHU-700 is an advanced electronic steam humidifier designed for precise humidity control with minimal manual intervention. It features full modulation and a patented self-regulating maximum output, ensuring stable and simplified humidity management.

Specifications and Features

Accurate humidity control with automatic adjustments, eliminating the need for manual maintenance.
Self-diagnostic capabilities that monitor operations and display conditions for easy troubleshooting.
Available in various models, with the largest providing up to 240 lb/hr steam output.
Designed to protect materials and equipment by maintaining optimal humidity levels, preventing static electricity buildup and material deterioration.

Operation and Mechanism

The EHU-700 converts tap water into steam, which is then distributed to achieve the desired humidity level.
A microprocessor interprets humidity demand and adjusts the water level in the tank to modulate steam output.
Features include a high-water float switch, automatic drain cycle, and overcurrent protection to ensure safe and efficient operation.

Self-Regulation and Modulation

The unit's full modulation feature allows continuous adjustment of steam output to match humidity requirements.
Patented self-regulating maximum output prevents "hunting" by adjusting output based on demand history.

Maintenance and Diagnostics

Built-in diagnostics detect operational issues early, minimizing repair costs.
The steam generating tank is cleanable and replaceable, with indicators for when maintenance is needed.
Compatible with various control signals and includes advanced controls for specific applications.

Steam Distribution Methods

Steam can be distributed through existing air ducts or directly into areas using Armstrong EHF fan packages.
Different models of steam dispersion tubes are available to suit various duct sizes and configurations.

Conclusion
The Armstrong Series EHU-700 is a reliable and efficient solution for maintaining optimal humidity levels in various environments, offering ease of use, minimal maintenance, and advanced control features.

Steam Dispersion Tube Selection
The document provides a table listing various steam dispersion tube models (D-1 to D-10) with specifications such as tube length, duct width, and weight. The selection of the proper tube depends on the duct width requirements.

Selection and Ordering Procedures
Key factors include determining the required capacity, specifying electric characteristics, and selecting the appropriate humidistat. The document advises using insulated copper tubing for connections and recommends purchasing a spare steam generator for continuous service.

Series EHU-700 Capacities and Electrical Ratings
The document includes a detailed table of capacities and electrical ratings for different models (EHU-701, EHU-703, EHU-704) under various voltage conditions. It highlights the importance of selecting the correct model based on the humidification load and power supply.

Suggested Specifications
The humidifier should be self-contained, electrically controlled, and capable of generating steam from tap water. It should include features like modulating control, self-regulating capacity, and diagnostic displays. The document specifies the need for a high-water float switch and a digital display for monitoring.

Installation and Physical Data
The document provides guidelines for installation, emphasizing accessibility for maintenance and the use of high-limit humidistats and air proving switches. It includes dimensional drawings and physical data for different models, specifying materials and weights.

Catalog excerpts

Chart 138-1. This chart represents the patented self-regulatingmaximum output of the EHU Series from start-up. To avoid hunting, the unit gradually increases capacity from 40% of maximum to 60% to 80%. In this case, the output satisfies the humidistat demand at a level below 80% of maximum capacity. The modulating feature then takes over and controls the unit output. The self-regulating maximum output can then adjust up (to 100% in this example) or down (to 60%) as demand history warrants. The feature intermittently resizesӔ the humidifiers maximum capacity to avoid hunting and to provide humidity...

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Table 137-1. Diagnostic Display DisplayInterpretationUnit Response C00Normal operation C01High-water conditionStop water fill C02Tank needs cleaningAlarm C03Interlock circuit openPower off to tank C04High-limit stat openPower off to tank C05Drain system malfunctionAlarm and shutdown C06Fill system malfunctionAlarm and shutdown C07Overcurrent malfunctionAlarm and shutdown C08Manual tank shutoffPower off to tankC09I/O diagnosticsPerform I/O display Armstrong Humidification Group, 816 Maple St., Three Rivers, MI 49093 Ԗ USA Phone: (269) 273-1415 Fax: (269) 273-9500 > www. armstrong international.com...

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Table 144-1. Materials and Weights Table 144-2. Physical Data MaterialsEHU-701EHU-703EHU-704 EHU-701EHU-703EHU-704 Generator TankPolypropylene inmminmminmm Cabinet Material16 ga Steel16 ga Top & Bottom; "A" Width18457 19-1/249533-1/2851 18 ga Sides; Steel "B" Height23584 3178731787 Cabinet FinishBaked-On Epoxy Enamel CoatingElectrodesType 430Galvanized Carbon Steel "C" Depth11-1/22921435614356 "D" Tank Drain (Side)6-5/8168 3-1/4833-1/483 Stainless "E" Tank Drain (Front)10-5/16262 14-3/437514-3/4375 Hose CuffsEPDM (Ethylene Propylene) Rubber "G" Tank #2 DrainN/AN/AN/AN/A28-3/4730 Dispersion TubeType...

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Figure 145-1. Model EHU-701with EHF-2 Fan Package Front ViewFigure 145-2. Model EHU-701with EHF-2 Fan Package חSide ViewFigure 145-3. Model EHU-703 Front View Figure 145-4. Model EHU-704 ח Front ViewFigure 145-5. Model EHU-703and 704 Side ViewNote: AH B MEConnectionFor 1" ID HoseK AHNBMEK C > 1 2 "ID Hose ConnectionFor 1"ID Hose ConnectionFor 1 D L J > The EHF-3 is a remote mounted direct discharge unit. AIH B MKEGConnectionFor 1" ID Hose C LDJ > All dimensions and weights are approximate. Use certified print for exact dimensions. Design and materials are subject to change without notice. Armstrong...

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