FOR HVAC INSTALLER AND HOMEOWNER
5.3E Setting Relative Humidity Set point
The relative humidity Set point operates the dehumidifier function of the
If the Set point is equal to or greater than the current ambient condition, the space does not need to be dried, sothe dehumidifier function will be off. Example: Set point: 50%RH Current condition 45% RH = Dehumidifier off, red “DEHU”indicator not lit.
If the Set point is less than the ambient condition, thedehumidifier will be on, and the red “DEHU” indicator will be lit. The space is more humid than the Set point, so the controller operates the dehumidifier to dry the space.Example: Set point: 50% RH Current condition: 55% RH =Dehumidifier on, red “DEHU” indicator lit.
To set the relative humidity Set point, press the “HUM”button. The display will show the “HUMIDITY” display, and theword “SET” will flash. Use the “SET” + or – buttons to adjustthe relative humidity Set point as desired.
is not recommended thehumidity Set point be set below 35%. In order to dry thehome in the winter in a cold climate, use the ventilationfunction of the system rather than the dehumidifier function.
5.3F Fan Setting and Operation
Use the “FAN” button to adjust the fan operation. There are 3 choices for fan operation: “on”, “off” (denoted by “OF”), or program (denoted by “Pr”). To set operation,
1.Press the “FAN” button. The display will indicate the current fan setting.
2.Use the “SET” + or – buttons to adjust fan operation (“on”, “OF”’ or “Pr”). Press the “FAN” button again or leave the unit alone for 10 seconds to return to home state.
5.3G Fan On Fan Off Fan Program
The fan display reading in the normal display sequence does not indicate the current fan setting, it indicates the current fan status, and will always read either on or off. With the fan in the
“on” mode, the fan will run continuously. This does not effect the dehumidification functions of the system. The system may or may not be ventilating or dehumidifying while the fan is running. Common reasons for operating the fan continuously are continuous filtration and air recirculation. With the fan in the “off” or “program” mode, the fan will operate only when needed by other functions of the system. The fan will remain off unless the system is dehumidifying and/or ventilating. The fan always runs during dehumidification, it also always runs during ventilation. To completely turn the system off, use the “ON/OFF” button as described earlier.
5.3H Damper Operation and Setting (Ventilation)
The damper setting controls the ventilation function of the system. It has no control over the dehumidification function. In order to provide ventilation, the damper must be open (“on”) and the fan must be running. The controller takes care of these two functions automatically, so whenever the damper is open (“on”), the fan is running.
This is true even if the fan has been set to the “off” mode. The ventilation indicator will be lit whenever the unit is ventilating.
There are three damper operation modes, “on”, “off” (denoted by “OF”), and program (denoted by “Pr”). With the damper in the “on” mode, the damper will be open and the fan of the system will be operating in order to introduce fresh air into the space. Use this mode for continuous fresh air ventilation. The fan is always on when the damper is open. When in “off” mode, the damper will not open and the system will not ventilate.
When in the “program” mode, the control will operate the damper and fan (ventilate) according to the programmed ventilation schedule (see the section referring to programming the ventilation schedule).
To select damper operation:
1.Press the “DAMPER” button. The letter “d” will appear on the display, along with the current mode setting.
2.Use the “SET” + or – buttons to adjust the fan setting to the desired mode (“on”, “OF”, or “Pr”).
3.Press the “DAMPER” button again or leave the control alone for 10 seconds to select the indicated damper mode and return to the home state.
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