C09: I/O DIAGNOSTICS

If the display mode selection is left in the diagnostic mode for 10 seconds, the Input/Output circuit diagnostic check will begin. The display will show the message C09, the tank will be off, and the diagnostics mode light will remain on.

Output Circuits: The diagnostics will first check all the output circuits: fill valve, drain valve, and tank contactor to make sure they are working. When a light comes on, you will hear the corresponding valve or contactor circuit energize for about 2 seconds. Each circuit is checked twice before proceeding to the next circuit.

Input Circuits: Next the microcontroller checks the status of all input circuits, beginning with the control stat. the 3 digit display will show 0% Demand, then the actual stat demand. It will do this twice. The input diagnostics continues by checking the fan interlock switch, high limit duct humidistat, and high water switch. The display will now show C09 followed by any additional messages that indicate problems with the input circuits.

When the I/O diagnostic check is finished, the demand mode light will be on, the display will show the control stat demand and the unit will return to normal operation. The complete I/O diagnostic check lasts less than 2 minutes.

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Armstrong World Industries EHU-701, EHU-700 Series, EHU-703, EHU-704 manual C09 I/O Diagnostics
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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.

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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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