EHU-700 Diagnostics

THE Series EHU-700 has built in diagnostics to detect system problems early, before they become severe. If possible, the diagnostic routine performs corrective measures. If necessary, the unit is shut- down and a dry contact is closed to enable a remote alarm.

The diagnostic messages that result in the unit being shutdown are displayed automatically. The other messages are displayed when the diagnostic display mode is selected with the mode switch. If the dis- play mode selection is left in the diagnostic mode for 10 seconds, the Input/Output circuit diagnostic check will begin.

DIAGNOSTIC DISPLAY MESSAGES

C00 = NORMAL OPERATION

C01 = HIGH WATER

C02 = TANK NEEDS CLEANING*

C03 = INTERLOCK CIRCUIT

C04 = HIGH-LIMIT CIRCUIT

C05 = DRAIN SYSTEM FAILURE*

C06 = FILL SYSTEM FAILURE*

C07 = OVERCURRENT FAILURE*

C08 = MANUAL TANK SHUT-OFF

C09 = I/O DIAGNOSTICS

* Automatic shutdown and Alarm contact closure.

C00: NORMAL OPERATION

C01: HIGH WATER:

A high-water float switch prevents water carry-over into the duct due to too high a water level in the tank. When the high water limit is reached the HIGH WATER light comes on and the fill valve is blocked until some water is boiled away and the water level drops. This is not uncommon on startup. The diagnostic display mode will indicate C01.

NOTE: the high water light goes off as soon as the high water condition is cleared but the operation on the fill valve does not resume until after a fifteen second delay period. If C01 is displayed and the water level is in the lower half of the steam generator, high static pressure exists, contact the factory for assistance.

C02: TANK NEEDS CLEANING:

If the HIGH WATER lights is on continuously during normal service (i.e. after initial startup) and the current is not increasing, the tank probably needs cleaning (refer to the maintenance section of this manual). If this condition persists without being serviced, the display panel will display diagnostic message C02. The unit will shutdown and the dry contact will close to activate the remote alarm. NOTE: False C02 messages may occur if incoming water is very pure (< 100 μMhos/cm²). Please consult factory.

C03: INTERLOCK CIRCUIT:

The fan interlock circuit may be a sail switch or (preferably) a duct pressure switch. When air flow in the duct is not present, the interlock circuit should open and the microcontroller will de-energize the contactor. The diagnostic mode will display the message C03 and the fill solenoid is blocked.

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.

Armstrong World Industries EHU-700 Series manual EHU-700 Diagnostics, Diagnostic Display Messages

Models: EHU-701 EHU-700 Series EHU-704 EHU-703