Installation and Maintenance
EHU-600 Series Humidifiers
30
2.
Input Circuits
After the output circuits have been checked, the Tank Full light will
begin blinking continuously, signaling the start of the input test. Each
light corresponds to an input circuit. Chart 30-1 shows the input circuits
tested. All are tested simultaneously.
Chart 30-1
Light Not On
Check Input Circuit
Fill
(a) High water probe
Drain
(b) Fan interlock switch
Tank Full
Blinking indicates input testing
Tank Off
(c) High limit humidistat
Demand Meter
(d) Control humidistat
NOTE: The Tank full light will continue to flash during the input test.
a.
If light is off, circuit is complete. Check for water in tank or
dirty tank.
b.
If light is off, check that fan interlock switch is wired properly.
c.
If light is off, check that high limit stat is wired properly.
d.
If no demand signal, room is either over-humidified, or stat is
mis-wired, or malfunctioning.
If All the lights are on, then all controls are allowing the humidifier to fill.
In case of component malfunction, consult your Armstrong Represen-
tative or the factory for further assistance.
Note: To end the diagnostic routine, push and release the Tank On/
Off switch once. If left in the diagnostic routine for more than 3 minutes,
the DRAIN light will begin to cycle 1 minute off, 3 minutes on.
If the unit is functioning normally, turn the water supply back on. Push
and release the Tank On/Off switch again to start the unit.
During normal operation, if the drain is open (Drain light on) for more
than 3 minutes, the contactors will trip out the unit and turn the Tank
Off light on. This indicates some form of drain system failure (clogged
drain, failed valve, etc.) The unit may be reset only by turning the
main power on and off.
For additional troubleshooting information, please request
Form 903 from factory or call HVAC Application Engineering
at (269) 273-1415 or Fax (269) 273-9500. Visit our web site
www.armstrong-intl.com.
