Aprilaire 1150 Installation, Operation And Maintenance Manual page 11

TAblE 4 – Display Panel light Indications
Indicator light(s) Status
All Blinking sequentially
On
On/Off (switch) Slow blinking (1/sec .)
Fast blinking (10/sec .)
On
Drain
Blinking
On
Fill
Blinking
On
Steam
Blinking
Note:
See the Troubleshooting section in this manual for more information .
AUTODRAIN SEQUENCE
The humidifier drains and flushes automatically at regular intervals to remove minerals from the chamber .
After the humidifier has run for a preprogrammed amount of time, and if there is no demand for humidity, the humidifier sits idle
until the chamber cools and then it drains .
If the humidifier has not completed an autodrain sequence due to continual demand signal interruptions, after an additional
amount of run time the humidifier begins a cool-down period and then it drains .
IMPORTANT: The humidifier attempts to complete an autodrain sequence when there is no demand for humidity . However,
if an autodrain sequence is not completed within a defined period of time, the humidifier ignores the demand signal until
completing an autodrain sequence . This could cause the relative humidity level in the humidified space to drop until the autodrain
sequence completes .
Description
The humidifier is in a forced cool-down period prior to a required automatic drain sequence .
Normal operation .
Power is on . Normal operation .
The electronic water level probe needs cleaning .
Probe logic fault . See Troubleshooting section .
The humidifier is draining . Normal operation .
The allowed amount of time for draining has been exceeded . Fault in drain operation .
Humidifier will continue to operate . See Troubleshooting section .
The humidifier is filling . Normal operation .
The allowed amount of time for filling has been exceeded . Fault in fill operation .
Humidifier will not operate . See Troubleshooting section .
The humidifier is making steam . Normal operation .
The humidifier has received a demand signal but cannot make steam because:
• There is not enough water in the chamber, or
• An enable/safety switch is open
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