Armstrong World Industries EHU-704, EHU-700 Series Steam Generator Chemical Cleaning Procedure

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STEAM GENERATOR CHEMICAL CLEANING PROCEDURE

This procedure is intended as a guide only for the chemical cleaning of the generator in all EHU mod- els. Read and follow label directions on any cleaning product. Check local codes before disposing of chemicals.

Caution: Muriatic acid can cause severe chemical burns if not handled properly. Wear rubber gloves and eye protection when using. Read and follow carefully the safety procedures on the package.

1)Obtain several gallons of muriatic acid. Muriatic acid is the name for commercial hydrochloric acid. It is available in most hardware, pool chemical, or farm supply outlets.

2)Remove the tank, following the "Tank Removal" directions in this manual.

3)Let the steam generator tank cool after removal from the EHU unit.

4)Split the tank, referring to the directions on page 33 of this manual, and examine the inside of the tank and the electrodes.

a.If the tank is black or dark brown, the electrodes may have disintegrated and chemical cleaning may not be effective. The tank can be cleaned with the following process, but the electrodes may need to be replaced.

b.If tank and electrodes have a white/tan/grey mineral accumulations and/or the tank is partially filled with loose lime accumulations, proceed with chemical cleaning.

5)Empty any loose deposits from the bottom tank half. Both tank halves and the barrier assembly, if present, can be cleaned using a scraper, a stiff bristle brush, and water spray as required. Refer to the directions on page 33 of this manual for details on removing the drain screen for further cleaning, if necessary.

6)Remove the electrodes from the upper tank half, following the directions on page 33 of this manual. Loose and/or soft deposits should be scraped from the exterior of the electrodes before chemical cleaning.

7)Prepare the chemical cleaning solution as per manufacturer's recommendations and fill a plastic bucket to a sufficient level to soak the electrodes. Be certain not to submerge the electrodes beyond the level of the screen.

8)Let the cleaning action take place for 15 minutes. Remove the electrodes from the bucket and rinse them thoroughly with a clean water spray.

9)Observe the electrodes to determine if another treatment is necessary.

10)It is not necessary for the electrodes to be cleaned down to bare metal. Removal of major accumulations is the only requirement.

11)Helpful Hints:

*Check the drain valve for proper operation & good flow when the tank is drained prior to removal.

*With the tank removed, inspect the drain adaptor and hose from adaptor to drain valve to ensure that it is free from deposits which may interfere with proper drainage.

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Contents Installation and Maintenance Metal Tools Away from These Areas Table of Contents Site Selection PRE-INSTALLATIONCheck Shipment Check Local CodesWater Total Important Please observe the following InstallationElectrical Service Wiring Mounting the HumidifierConnect Drain Water Fill SupplyPressure in duct is high, see Figure Control Humidistat Control WiringWall Mounted Control Humidistat 10 FtDuct Mounted Control Humidistat Airflow SwitchHigh Limit Duct Humidistat Generator a Audible AlarmInstrument Panel Before Turning on the Power START-UP Procedure for Armstrong Series EHU-700 HumidifiersTurn on Power AT the Circuit Breaker Page Page Troubleshooting Guide Tank Contactor Operation Operational GuidelinesMonitoring Stat Demand Automatic Drain Operation Monitoring % PowerManual Drain Mode Monitoring CurrentC00 Normal Operation C01 High Water EHU-700 DiagnosticsDiagnostic Display Messages C02 Tank Needs CleaningC07 Overcurrent Failure C04 High Limit CircuitC05 Drain System Failure C06 Fill System FailureC09 I/O Diagnostics Water Quality and Treatment for EHU Series Humidifiers When Water Conductivity is TOO LOWGeneral Remedies When Water Conductivity is TOO HighResults RemedySteam Generator Parts Valves and Mechanical Parts Electrical Parts EHU-700 Parts List Month to 1 Year MaintenanceRecommended Maintenance Schedule To 2 Days After Start UP Steam Generator MaintenanceTank Removal and Replacement ALL Models Steam Generator Chemical Cleaning Procedure Page Models EHU-703 and 704, Single and Three Phase Tank DISASSEMBLY, CLEANING, and Electrode ReplacementFill and Drain System Repair Model EHU-701, Single and Three PhaseDrain System Failure Fill System Failure Sensor Failure Protection Autocal ProcedureSpecifications Humidistat DataSensor Characteristics DimensionsAIR Supply High Limit Humidity Sensor Humidity SET Point Reset by Outside TemperatureHumidistat model number H270-69-13-10-31 Application ExampleDimensional Information

EHU-701, EHU-700 Series, EHU-704, EHU-703 specifications

Armstrong World Industries has long been a leader in the ceiling and wall solutions industry, and its EHU-700 Series exemplifies the commitment to innovation and quality. The EHU-700 Series, which includes models such as the EHU-703, EHU-704, and EHU-701, is designed for a variety of commercial applications, combining aesthetic appeal with superior performance characteristics.

One of the key features of the EHU-700 Series is its exceptional acoustic control. The panels are crafted using advanced sound-absorbing materials that effectively reduce noise levels in busy environments. This makes them ideal for areas such as offices, schools, and healthcare facilities, where quietness can significantly enhance productivity and comfort. The EHU-700 Series has been rigorously tested and certified to meet stringent industry standards, ensuring its effectiveness in noise reduction.

Additionally, these ceiling panels are designed with durability in mind. Made from high-quality components, the EHU-700 Series is resistant to moisture and staining, making them suitable for spaces exposed to humidity, such as kitchens and restrooms. This resilience ensures that the panels maintain their aesthetic appeal over time, reducing maintenance costs for facility managers.

The EHU-700 Series also incorporates Armstrong's innovative technologies to enhance ease of installation and flexibility. The panels feature a lightweight design, allowing for straightforward handling and installation. Compatibility with various grid systems ensures that the EHU-700 Series can be easily integrated into existing architectural designs, providing a seamless finish.

Another significant aspect of the EHU-700 Series is its commitment to sustainability. Armstrong World Industries emphasizes eco-friendly manufacturing processes and materials, allowing architects and builders to achieve green building certifications, such as LEED. The use of recyclable materials in the panel composition reflects a commitment to reducing the environmental footprint.

In summary, the EHU-700 Series, including the EHU-703, EHU-704, and EHU-701 models, showcases Armstrong World Industries' dedication to quality and innovation. With unparalleled acoustic performance, durability, installation convenience, and sustainability, these ceiling panels are ideal for a wide array of commercial environments, proving to be a valuable investment for modern architectural needs. Their combination of functionality and design ensures that they meet the demands of today's dynamic spaces.
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