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USING THE INDEPENDENT HUMIDITY SETTING
Use the Independent Humidity setting with the outdoor sensor for dew-point adjustment so moisture
will not condense or freeze on windows.
The bypass humidifier can be used, and is recommended, with the Independent Humidity setting.
This will allow additional moisture to be added and distributed throughout the house without a call for
heat. The added humidity would increase the comfort levels of the dwelling.
The mist humidifier generates more water directly than the other two types of humidifiers. The
Independent Humidity setting SHOULD NOT be used.
If a power (fan-style) humidifier is used, (one equipped with a separate transformer) it will be
necessary to use an isolation relay.
Application Example:
A bypass humidifier is installed with a down-flow furnace. The house temperature (setpoint is 73°F) is
75°F (The graph above shows that the automatic setpoint for RH is 30%, when the outdoor temperature
is 10°F). The thermostat is user selected to the Auto humidity setting.
The humidifier and fan activate adding moisture to the dwelling as needed to reach 32%RH. The
humidifier and fan will reactivate when the humidity drops below 28%RH. The setpoint is ±2%RH.
Condensation – If humidity levels cause condensation on windows, then this control needs to be adjusted.
This adjustment must be made over a 12-hour period to allow the humidity levels to stabilize.
For instance, by selecting –5% RH on the adjustment, the humidity will maintain 25% ± 2%RH with an
outdoor temperature of 10°F. If -5% is not enough to avoid condensation, then lower the Auto Humidity
Setting to -10%RH. The controlling RH will be 20%+ -2RH with an outdoor temperature of 10°F.
Auto Humidity Setting (AHS) +/- Dew Point Adjustment
AHS + 15%
AHS + 10%
AHS + 5%
Auto Humidity Setting
AHS - 5%
AHS - 10%
AHS - 15%
-40 -30 -20 -10 0 10 20 30 40 50 60 70
Outside Temperature °F
Auto Humidity Setting
10
15
20
25
30
35
40
45
50
Recommended Settings