Armstrong World Industries EHU-703 Instrument Panel, MODE BUTTON, INDICATOR, and DISPLAY, Button

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.

The Mode select button is depressed for approximately ½ second to switch both the "display mode selected" indicator and the 3 digit display between:

-DEMAND-% of humidistat control range. -CURRENT-actual current in amps.

-% POWER- ratio of current draw to the nominal rating of the unit.

-DIAGNOSTIC MODE- readout of diagnostic

INSTRUMENT PANEL

MODE BUTTON, INDICATOR, and DISPLAY

DEMAND

CURRENT % POWER DIAGNOSTIC

FILL

DRAIN

HIGH WATER

TANK OFF

MODE SELECT

TANK ON/OFF

DRAIN ON/OFF

FILL LIGHT

DRAIN LIGHT

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

TANK OFF LIGHT	Indicates when power to the generator has been interrupted (tank
	contactor open).
TANK ON/OFF	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.
MANUAL DRAIN	Depressing the manual drain button for ½ second will open the drain
BUTTON	valve. The tank will continue to drain until the button is pressed again.

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