Armstrong Electric Steam Humidifiers - EHU 800 Series

EHU-800
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The Armstrong Electric Steam Humidifiers EHU 800 Series is the smartest choice for your indoor air quality needs. With its 24VAC main PC board and onboard controller, you'll have easy control and monitoring capabilities. Plus, with standard Modbus communications and native Modbus Controls, you'll have access to your information from anywhere with a Building Management System.

Armstrong has been producing an EHU series for over 35 years with over six different series upgrades. We can truly say the 800 series is the smartest of them all. The brains of this unit is the 24VAC main PC board with an on board controller. The PC board is connected to the digital display and keypad, making the unit user friendly as well as making a plethora of information visible on the display. Taking it one step further, this unit also comes standard with native Modbus Controls, which creates a gateway for the information to be visible on your desktop. See below for some of the Features & Benefits that can be found in the EHU-800 series.

Water enters the bottom of the steam generator tank and rises until it reaches the electrodes. Upon contact, electrical current flows through the water, causing it to boil and produce steam (Figure 1).

When the water level rises, as shown in Figure 2, increased electrical current flows through the water, producing more steam. This increase will continue until the required output of steam (i.e. amperage requirement) is reached.

At this point, the fill valve will cycle to maintain the required amperage. When the transmitter senses the added moisture in the air, the demand for humidity begins to drop. As the demand falls, the output of the unit modulates down by decreasing amperage, and therefore steam flow. The fill valve can then cycle at the lower steam output (amperage) requirement.

Figure 3 shows what happens when the humidistat demand signal drops below a minimum demand: The contactor is de-energized, and steam output stops.

Digital Display w/ Keypad: Digital display that has the capability to see 50 different screens from current amp draw to when the unit will drain again, etc.

Self Diagnostics: The unit continuously monitors the operation through self diagnostics. If it sees an issue the unit first tries to fix it itself and then if the problem persist it will display one of eight messages to indicate the condition.

Adjustable Output: The EHU-800 series units are fully modulating, but the unit also has the ability to limit the maximum output. If anything in your system is to change such as the CFM, temp, etc., the output of the unit can be capped to accommodate each application.

Cleanable Tank: The tank provided with the EHU-800 series combines economical maintenance and convenience. You can easily disassemble and inspect the steam generator tank. The digital display will also alert when maintenance is needed. The onboard controller will analyze the amount of run time based on demand. When it is necessary, you have the option to clean the tank or replace it entirely.

Standard Communications: As mentioned above, all EHU-800 series units come standard with Modbus communications (RS485 connection). This allows the user to communicate with the humidifier through the Building Management System (BMS). The humidifier can be controlled and monitored from a remote location. Everything that is accessible through the front display of the humidifier, will be visible through the BMS. With being native Modbus, the unit can be easily converted to BACnet or Lon works with the use of a protocol translator.

Onboard Controller: This series also features an onboard controller, which gives the user the capability to install sensors instead of a standard humidistat or modulating high limit. This makes wiring easier as the sensors that are used to monitor the space conditions with the BMS can also be used to control the humidifier.

External connections: The water and drain connections are easily accessible points on the bottom of the unit to make installation much simpler and easier. This also eliminates some connection points inside the cabinet to help reduce the risk of electric failure due to moisture in the cabinet.

Smaller footprint: Over the years the EHU series has been the smallest of all the atmospheric steam generators. The width of the EHU-800 is slightly smaller than its predecessors, making it even easier to install.


General Features
Brand Name
Armstrong
Model Part Number
EHU-800
Product Series
EHU-800
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