Thermolec ACU-STEAM, User Manual

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Page 4
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4. How to Control the Humidity
4.1 Humidity level and comfort are personal matters but it is generally acknowledged that a Relative
Humidity of 35-45% is desirable. However, you should take the outside temperature into consideration
before setting the humidity level in order to avoid condensation on the windows. Usually, a narrow strip of
condensation around or at the bottom of the window is considered as normal.
4.2 If you installed an ACU-STEAM humidistat and an outdoor sensor, this adjustment will be done
automatically through a function called outdoor reset. The outdoor sensor automatically reduces the humidistat
setting according to the outdoor temperature during cold days; it does the opposite during mild days. Please
see Fig. 4b for the percentage of relative humidity on the electronic humidistat label. The middle of the scale
corresponds to the middle of the comfort zone, approximately 35% RH (Relative Humidity).
Note: There are no numbers printed on the Humidistat itself.
4.3 If you are using a humidistat by others, the humidity adjustment according to the outside temperature
might have to be done manually. For your information, the following table shows the recommended setting of
the humidistat according to the outside temperature. Please see Fig. 4a.
.
4.4 No matter which humidifi cation system you are using, please do not forget that the humidity level
cannot adjust quickly. It may take some time to build up the humidity to your comfort level. Depending on the
dryness of the house, carpets, furniture, drapes and wood will absorb moisture before you can feel the change.
4.5 If the house remains unoccupied during the winter season, set the humidistat to the minimum set point
in order to prevent condensation.
Fig. 4b
!
35
30
20
40
50
Outside Temprature Recommended Setting
-22ºF (-30ºC) 15%
-13ºF (-25ºC) 20%
-4ºF (-20ºC) 25%
+5ºF (-15ºC) 30%
+14ºF (-10ºC) 35%
above
23ºF
(-5ºC) 40%
Fig. 4a