Nortec RH2+ - Manual (Page 35)

Operation| 32
LED Status Lights
The RH2 user interface includes 2 LED’s which provide information about the humidifier status.
Figure 27: LED Status Indicator Lights
Selecting a Relative Humidity Setpoint
The optimum humidity setpoint depends on the reasons that a space is being humidified. The
“ASHRAE Handbook HVAC Applications” recommends specific design relative humidity 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
conditioned environment 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.