Operating Modes; Shut Down Procedure - Aprilaire 800 Installation & Maintenance Instructions Manual

oPeRaTInG MoDeS

When the humidifier is powered and turned on, the "On/Off" light is illuminated green .
During fill cycles, the "Fill" light illuminates green .
When the humidifier is turned on, any time the ADHC sends a call for humidity, the Steam light illuminates green .
Any time the drain valve is activated, the "Drain" light illuminates green .
During initial start up with a new canister, the humidifier may run through a series of fill/drain cycles until the conductivity of the water is in
a range that allows the humidifier to generate steam at the rated capacity . If the conductivity of the water is low, it may take several days for
the humidifier to generate steam at the rated capacity . The rated capacity is achieved when the humidifier is detecting 11 .5 amps of current
between the electrodes . If the humidifier has not reached capacity after 168 hours of operation, the Steam light will illuminate yellow on a call
for humidity . The humidifier will continue to operate with a yellow Steam light, and may satisfy the humidity requirements . Once rated capacity
is reached, the Steam light will illuminate green .
The internal controller adjusts water level in the canister to maintain a nominal current of 11 .5 amps between the electrodes . As minerals build
up on the electrodes, their effectiveness decreases, so the controller will increase the water level to submerge more of the electrode surface .
When the water has reached the high level probe in the canister and the internal controller no longer detects nominal current, the Service light
will flash red indicating that the canister needs to be replaced .
If the humidifier attempts to drain the canister and cannot, the drain and fill valves will pulse on & off for four seconds to dislodge minerals
which may be blocking the drain valve ports . The Drain and Fill lights will flash on & off when this occurs .
Any time power is disconnected or humidifier is turned off, the internal timer for start-up and drain cycles is reset .
If the humidifier has operated 168 hours without a drain cycle, the drain valve will open and drain the canister . Normal operation will continue .
If the humidifier is operating and a power failure occurs, once power is restored, the "On/Off" light will flash green for one minute, then the
humidifier will turn on .
enD of SeaSon /PeRIoD of InaCTIVITy SHUT-Down
The humidifier does not need to be turned off at the end of the humidification season . If 72 hours elapses without receiving a call for humidity,
the canister will automatically drain . The Drain light will remain lit for 24 hours . This may also occur during periods of inactivity during the
humidification season . The humidifier will resume normal operation when a call for humidity is made .

SHUT Down PRoCeDURe

To turn humidifier off, push ON/OFF button once . Humidifier will enter four-minute drain cycle . Fill valve will open to temper drain water . The
Drain light will flash green for 15 seconds then turn green for four minutes while the canister drains . Once the Drain light turns off, the drain
cycle is complete and the humidifier is off .
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