Armstrong World Industries EHU-703, EHU-701 Tank DISASSEMBLY, CLEANING, and Electrode Replacement

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Figure 34-1.

TANK DISASSEMBLY, CLEANING, AND ELECTRODE REPLACEMENT

MODELS EHU-703 AND 704, SINGLE AND THREE PHASE

1)Using a 7/16" wrench, disconnect the jumper wires from the steam generator.

2)Remove 24 metal clips by pushing gently on top of each clip with a screwdriver while cupping the clip with the other hand.

3)Lift the top half of the tank free of the bottom half and rest it on the electrodes. Use a ¾" wrench to loosen and remove the nuts from the six electrode studs.

4)Lift the top tank half from the electrodes. Remove the o-ring from the lower tank half o-ring channel and put it aside for re-use. On high voltage units, lift the barrier assembly out of the bottom tank half.

5)Clean the tank halves and the barrier assembly (Figure 35-1), if applicable, using a scraper, stiff bristle brush, and/or water spray. Rinse the unit with clear water. If necessary, the drain screen may be removed for cleaning by removing three screws and pushing up through the bottom tank connection with a screwdriver handle or other blunt object. The drain screen snaps back into place and is SECURED BY THE 3 SCREWS after cleaning. BOTH THE BARRIER ASSEMBLY AND

THE DRAIN SCREEN SHOULD BE REPLACED WITH NEW PARTS IF THEY ARE UNSERVICEABLE.

6)Install one electrode in the top tank half. Make sure the small o-ring is located at the bottom of the electrode stud. Push the electrode through one of the holes in the upper tank half. Slowly turn the electrode until it locks in place. Thread a nut, finger tight, onto the electrode stud. Repeat this process with the other five electrodes.

7)Turn the tank top half upright and rest it on the electrodes. Tighten the nuts on all the electrode

studs with a ¾" wrench, so they are just snug.

8)Install the electrode jumper wires to the studs at the top of the tank. Fasten one end of the jumper wire with a washer and a 1/4" hex nut, using a 7/16" wrench. There are three jumpers on a three-phase unit, and four jumpers on a single phase unit. On a single phase unit you should have only two loose ends ( Figure 34-1).

9)Install the o-ring in the bottom tank half o-ring channel.

A third hand or weight may be needed to hold one end of the o-ring in place while the other end is being installed.

10)Install the barrier assembly in the bottom tank half.

11)Lower the top tank half onto the bottom tank half. Line up the marks on the rim of the top and bottom tank halves to properly center the electrodes.

12)Look trough the top connection to make sure the o-ring is still in place.

13)Snap a metal clip over the flanges of the tank halves, midway between two alignment marks. Position another clip on the opposite side of the tank. Install all 24 clips in this manner.

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Contents Installation and Maintenance Metal Tools Away from These Areas Table of Contents Check Shipment PRE-INSTALLATIONCheck Local Codes Site SelectionWater Total Electrical Service Wiring InstallationMounting the Humidifier Important Please observe the followingConnect Drain Water Fill SupplyPressure in duct is high, see Figure Control Humidistat Control WiringWall Mounted Control Humidistat 10 FtAirflow Switch Duct Mounted Control HumidistatHigh Limit Duct Humidistat Generator a Audible AlarmInstrument Panel START-UP Procedure for Armstrong Series EHU-700 Humidifiers Before Turning on the PowerTurn on Power AT the Circuit Breaker Page Page Troubleshooting Guide Operational Guidelines Tank Contactor OperationMonitoring Stat Demand Manual Drain Mode Monitoring % PowerMonitoring Current Automatic Drain OperationDiagnostic Display Messages EHU-700 DiagnosticsC02 Tank Needs Cleaning C00 Normal Operation C01 High WaterC05 Drain System Failure C04 High Limit CircuitC06 Fill System Failure C07 Overcurrent FailureC09 I/O Diagnostics When Water Conductivity is TOO LOW Water Quality and Treatment for EHU Series HumidifiersGeneral Results When Water Conductivity is TOO HighRemedy RemediesSteam Generator Parts Valves and Mechanical Parts Electrical Parts EHU-700 Parts List Recommended Maintenance Schedule To 2 Days After Start UP MaintenanceSteam Generator Maintenance Month to 1 YearTank 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 ReplacementModel EHU-701, Single and Three Phase Fill and Drain System RepairDrain System Failure Fill System Failure Specifications Autocal ProcedureHumidistat Data Sensor Failure ProtectionSensor 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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