Selecting An Rh Setpoint - Nortec SE Series Installation And Operation Manual

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 Condair 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 40-50 % is recommended for this purpose to prevent over
humidifying.
Note: The job site design may have specified a setpoint chosen specifically for the
site. Refer to site documentation and where possible use setpoints specifically
determined for the site.
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 Condair 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. Condair 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.
Insulated copper
steam line. Support
so weight is not on
steam outlet.
47 | Operation
Figure 43: Nortec SAM-e Manifold
SAMe Manifold
Condensate line
'P' Trap