Armstrong World Industries EHU-700 Series User Manual

The Mode select button is depressed for 

approximately ½ second to switch both the

"display mode selected" indicator and the 3

digit display between:

% of humidistat control range.

actual current in amps.

ratio of current draw to the 

nominal rating of the unit.
-DIAGNOSTIC MODE-

readout of diagnostic

codes.

Leaving the display in the diagnostic mode for 10 seconds initiates
the input/output diagnostic routine (see Diagnostics pg. 20).

The 3 digit display also exhibits a diagnostic code in the event that  
the unit has shut down automatically.

Indicates  when the fill valve is energized to add water to the steam 
generator.

Indicates when the drain valve is energized to drain water from the 
steam generator.

Indicates that the water level in the generator has risen to the high
water level.

Indicates when power to the generator has been interrupted (tank 
contactor open).

Depressing the tank on/off button for ½ second will open the tank
contactor. The tank off light and the diagnostic light will be on and the
display will show the message CO8. The unit will stay in this mode
until the button is pressed again.

Depressing the manual drain button for ½ second will open the drain 

valve. The tank will continue to drain until the button is pressed again.

13

DEMAND

CURRENT

% POWER

DIAGNOSTIC

FILL

DRAIN

HIGH WATER

TANK OFF

MODE SELECT

TANK ON/OFF

DRAIN ON/OFF