Armstrong World Industries EHU-704 Duct Mounted Control Humidistat, High Limit Duct Humidistat

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Figure 11-1

1.9 - 3.9 Vdc

Voltage Source

17

Black

Part No.

White

C1471

Ground

2

Green

Stat In

1

or

 

N/C

20

 

C1472

Set BJ4 Stat Input Selector to 1.9 - 3.9 Vdc

Set BJ5 Voltage Source to 12 Vac

 

 

On-Off Humidistat

Switch Opens on RH Rise

Voltage Source

17

 

Brown

Part No.

 

 

A8581

Ground

2

 

Orange

Stat In

1

 

or

 

 

N/C

20

 

 

A8581A

Set BJ4 Stat Input Selector to On/Off Set BJ5 Voltage Source to +5 Vdc

4-20 mA & 0-10 Vdc Setting*

Voltage Source

17

-

Ground

2

+

Stat In

1

 

N/C

20

 

Set BJ4 Stat Input Selector to 0-10 Vdc or 4-20 mA

0-135 Ω Ohm Potentiometer

 

 

 

Part No.

Voltage Source

17

 

A6707A

Ground

2

 

or

Stat In

1

 

A18611

 

N/C

20

 

Humidity

 

 

 

Increase

Set BJ4 Stat Input Selector to 0-135 Ohm

Set BJ5 Voltage Source to +5 Vdc

*See Figure 10-1 for Armstrong 0-10 Vdc Humidistat Connections

Duct Mounted Control Humidistat:

Duct-mounted control humidistats are also available for installation where sensing and control of return air or exhaust air ducts is preferable. (Figure 10-1)

Please refer to manufacturer's recommendations for further information on the location, mounting, and operation of the various control humidistats.

10)HIGH LIMIT DUCT HUMIDISTAT

Remove the jumpers tab from terminals 10 & 14 and wire the high limit stat between these terminals. Refer to Figure 10-1 and Figure 11-1 (the overall wiring diagram) for more information. A duct mounted high limit humidistat is recommended to prevent over-saturation of the duct air. Use an on-off controller that opens on fault (high humidity). Humidistat should be set for a maximum of 90% RH. Alternately, a modulation high limit humidistat may be used on applications such as variable air volume (VAV). Locate the high limit humidistat approximately 10' (3m) downstream of the dispersion manifold. If 10' (3m) is not available, consult the factory.

11)AIRFLOW SWITCH

An airflow switch is recommended to deactivate the humidifier when there is insufficient air flow in a duct system. A duct pressure switch is preferred as an airflow sensor. The pressure switch should open on insufficient airflow (opens on fault). Airflow switch should be mounted in supply air duct upstream of humidifier dispersion. Remove the jumper tabs between terminals 9 & 15 and wire the airflow sensor between these terminals. See Figure 11-1 and Figure 12-1 (the overall wiring diagram) for more information. Complete installation and wiring instructions are contained in the duct pressure switch package.

NOTE: LIMIT SWITCHES (HIGH LIMIT AND AIRFLOW SWITCHES) OPEN ON FAULT.

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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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