Armstrong World Industries EHU-704 manual Water Quality and Treatment for EHU Series Humidifiers

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WATER QUALITY AND TREATMENT FOR EHU SERIES HUMIDIFIERS

GENERAL

Series EHU 700 electronic humidifiers use ordinary tap water in their operation. The quality of this water affects both the operation and the maintenance of the humidifier.

How the EHU works:

The EHU is an electrode boiler. When no water is present, the electrodes are separated by air, an insulator, so no current flows. When tap water contacts the electrodes it conducts current between the electrodes, heating the water.

How much current passes between the electrodes is dependent on the conductivity of the water, which is measured in micromhos/cm (μMhos/cm). EHUs can operate effectively with water conductivity in the range of 50 (low) to 800 (high) μMhos. For conductivity greater than 800 μMhos, please consult facto- ry. The optimum incoming water conductivity level is 200-400 μMhos/cm. the greater the conductivity of the water, the lower its level will be in the tank in order to draw a given current. In general, the EHU- 700 Series will adjust its drain cycle to maintain the water level around 1/3-1/2 full in the tank.

What affects conductivity?

The minerals (mainly calcium) dissolved in the water. Pure water is NOT conductive and can't be used exclusively in an EHU without special procedures. This includes distilled, de-ionized and reverse osmosis diffusion treated water. Most tap water is conductive however, so it will work in an EHU. If tap water is not available, consult with the factory.

How does this affect maintenance?

Figure 23-1. Tank filled with mineral buildup.

Generally, the more conductive the water is, the more

 

 

minerals there are dissolved or suspended in it. As the

 

water is boiled away these minerals can be left as a

 

deposit on the electrodes, tank, and fittings. Any

 

deposits that build up can block valves, diminish the

 

internal volume of the tank, and form an insulating barrier

 

on the electrodes (Figure 23-1).

 

The EHU automatic drain cycle:

All Series EHU humidifiers have a built in blow down

circuit to intermittently purge excess mineral accumulations from the water. The drain cycle should automatically adjust for variations in water quality. Eventually, however, minerals will accumulate in the steam generator, and have to be removed (see tank cleaning in the maintenance section of this manual).

Water treatment guidelines for the EHU:

Generally, the EHU will work with any potable water source. If you are experiencing problems with your installation, however, the following suggestions may be helpful in identifying and rectifying your difficulty.

WHEN WATER CONDUCTIVITY IS TOO LOW

Indicators:

-Unable to reach humidity set point in space. -High water level in tank

-Low current draw and low % power reading even though the stat demand remains at 100%. -Consistent drain cycles of two seconds or less.

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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 FtHigh Limit Duct Humidistat Airflow SwitchDuct Mounted Control Humidistat Generator a Audible AlarmInstrument Panel Turn on Power AT the Circuit Breaker START-UP Procedure for Armstrong Series EHU-700 HumidifiersBefore Turning on the Power Page Page Troubleshooting Guide Monitoring Stat Demand Operational GuidelinesTank Contactor Operation 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 General When Water Conductivity is TOO LOWWater Quality and Treatment for EHU Series Humidifiers 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 ReplacementDrain System Failure Model EHU-701, Single and Three PhaseFill and Drain System Repair 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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