4
LED Indicators:
Front Panel Display:
SEASONAL DRAIN (RED) (Optional): When illuminated indicates that the system shutdown has
occurred (End-of-Use mode). Drain valve is in open position. Humidifier will return to normal operation
automatically when a call for humidity is detected.
SAFETY CIRCUIT OPEN (RED): When illuminated indicates that the humidifier has detected an open
circuit in the safety loop. The safety loop circuit consists of any device (such as airflow switch, high-limit
RH switch, etc.) that is connected across user terminals 7 and 8, or the reservoir Over-Temperature
Switch. If the reservoir Over-Temperature Switch has opened, this will also illuminate the red LED on
the main control board tagged as “Over Temp”.
POWER (GREEN): When illuminated indicates that 24 vac power is being supplied to the control board
and that MAIN POWER EXISTS in the control cabinet.
FILL VALVE OPEN (AMBER): When illuminated indicates that the 24 vac fill valve is energized.
WATER LEVEL FULL (GREEN): When illuminated indicates that the water level is between the top and
middle probes of the Tri-Probe assembly. Heaters will be energized on demand if the safety loop circuits
are also satisfied.
COOL DOWN CYCLE (AMBER): When illuminated indicates that the humidifier has automatically gone
into an auto drain cycle. Cool down cycle allows water temperature to drop before the drain valve
opens.
DRAIN VALVE OPEN (AMBER): When illuminated indicates that the 24 vac drain valve is energized.
HEATER ENERGIZED (GREEN): When illuminated indicates that power IS being supplied to the
heating elements.
Control Board LED Indicators:
LOW DEMAND (AMBER) (Optional): When illuminated indicates that the humidifier is in low demand
and the seasonal drain time (End-of-Use) is operating. After the present time of 40, 80, or 120 hours
humidifier will shut down and the reservoir will drain. NOTE: Timer resets every time humidity demand
occurs.
RH INPUT SELECTOR “PRI” (GREEN) (Optional): When illuminated indicates that the humidifier is
operating off of the primary input signal (example: room humidistat).
RH INPUT SELECTOR “HIGH-LIMIT” (RED) (Optional): When illuminated indicates that the humidifier
is operating off of the secondary input signal (example: high-limit duct humidistat).
CONTROL “CTR” (GREEN) (Optional): When illuminated indicates that the SCR control function is
operating normally. NOTE: Does not indicate power to the heating elements unless all safety loop
circuits are closed and water level is satisfied.
OVER TEMP (RED): When illuminated indicates that the reservoir Over-Temp switch has opened
indicating a failed condition. This switch must be manually reset before the humidifier will re-energize.
NOTE: Before resetting switch, make every effort to find the cause of the Over-Temperature condition.
Visually check water level and water supply. Check operation of the fill cycle.
OPEN FUSE (RED): When illuminated indicates the control fuse has opened. Find cause of overload
and replace with no larger than a 2 amp fuse. CAUTION: MAIN POWER STILL EXISTS in the control
cabinet.
To Next Page
Loading...
Need help?
General
