I n s t a l l a t i o n , O p e r a t i o n , & M a i n t e n a n c e M a n u a l
14
www.herrmidifier-hvac.com
Herrtronic
®
Model 6500
Unit Detected Faults (Red Service Light is ON)
Problem / Symptom
Probable Cause
Reason - Correction
Overcurrent (Solid Light)
The alarm condition occurs when an
overcurrent situation (>138% of rated
current) has occurred and the humidifier
has shut down to prevent any damage.
This alarm indicates that there has been
a significant reduction in resistance
between the main legs of the supply
power and the humidifier has been shut
down to prevent damage and should be
serviced before it is restarted. Fault LED
R33 will be illuminated (solid - no flash).
Dead short between electrodes.
Replace the steam cylinder. Check
resistance between electrodes with power
OFF.
Restricted or blocked drain.
Clean and inspect drain system.
Restricted fill system.
Clean and inspect the fill system. Check
for restriction or loss of supply pressure.
Incoming water conductivity is outside the
range of normal circuit board settings.
Consult the factory for options.
Check amp draw to unit during start-up.
If amp draw greatly exceeds rated amp
draw, the drain threshold pot, labeled “Low
Drain Threshold Pot”, must be increased
2% to increase the frequency and duration
of drains to reduce the conductivity inside
the cylinder.
Manually drain the unit and restart.
End of Cylinder (Fast Blink)
This alarm condition occurs if the
humidifier is unable to reach full output
over a 24 hour timeframe. This alarm
indicates a need to change the cylinder,
that the water supply is low in conductivity,
or that a foaming condition exists.
End of cylinder life – Cylinder life is
typically between 500 and 2000 hours,
depending on incoming water supply.
For emergency use, you may restart the
humidifier with the Capacity Adjustment
Pot, at a lower level to allow operation
until a replacement steam cylinder can
be obtained. To clear the fault, turn the
main disconnect to the unit “off” and then
back ON.
If incoming water supply is less than 125
micromho, the unit may not be able to
pass the rated current through the water.
See NON-FAULT ACTIVATED
PROBLEMS GUIDE – “Unit fills to the
cylinder full condition and remains cold.”
Foaming condition exists.
Flush and fill the steam cylinder several
times and restart. If it persists, you must
filter or treat the water to remove the
foaming agent. See circuit board settings
on previous page if supply water is
softened. See NON-FAULT ACTIVATED
PROBLEMS GUIDE – “Water foaming
inside the cylinder.”
Fill System Fault (Slow Blink)
This alarm condition occurs when the fill
valve has been energized for a 24 minute
timeframe. The humidifier has been
shutdown to prevent any damage.
Loss of or restricted water supply.
Check fill system.
Leaking drain system.
Check drain system.
Defective drain valve.
Repair and replace as required.
Defective fill valve.
Repair and replace as required.
NOTE: The three fault conditions outlined above will cause the humidifier to shut down and the fault light on the front of
the unit to illuminate. To clear these faults, the main power must be turned OFF and back ON again.
