Operation | 30
LED Status Lights
The RH user interface includes 2 LED’s which provide information about the humidifier’s current
status.
Figure 26: LED Status Lights
Selecting an RH Setpoint
The optimum humidity setpoint depends on the reasons that a space is being humidified. The
“ASHRAE Handbook. HVAC Applications” recommends specific design relative humidities for
specific applications. See also Nortec publication “When You Need Humidity” (Form 124A) for
more information on humidity settings.
Health and Comfort - The benefit of humidity is most pronounced for health and comfort in the
40-60% range. A humidity setting of 45-50% is recommended for this purpose to prevent over
humidifying.
Temperature Setback - In cold climates it is often necessary to reduce the humidity level in a
space to prevent build up of condensation on the inside of exterior walls, windows, and trim. It
is highly recommended that the temperature setback function of the Nortec Digital controls be
used under these conditions to prevent damage from condensation. The digital control with an
outdoor temperature sensor installed will automatically setback the humidity setpoint to
correspond with outdoor temperature.
Duct High Limit – The duct high limit is intended to prevent saturation and wetting in duct work
at high load conditions. Nortec recommends a setting of 85% for the duct high limit. It may be
necessary to reduce this setting If the duct work is very cold or in contact with exterior cold
surfaces.
Yellow LED Steady On
When the yellow LED is steady on (not flashing) it indicates that the high water sensor
has interrupted filling of the cylinder. The LED is on for information only and unless it
persists for an extended period of time it does not require any action.
Green LED On
Green LED Blinking
Indicates steam is being produced
Indicates humidifier is on but there is
no requirement for humidity..
Yellow LED On
Yellow LED Flashing
Indicates that water level is high
Indicates the controller has detected
a fault and he humidifier has shut
down. (See table 7 on page47
for meaning of flashes)
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