Therma-Stor Products Group UA-150H - Manual (Page 13)

13 Ultra-Aire 150H Installer’s & Owner’s Manual
5.3E Setting Relative Humidity Set point
The relative humidity Set point operates the dehumidifier function of
the Ultra-Aire. It has no effect on any other function of the unit. The
control senses the ambient relative humidity of the space in which
it is located. The ambient condition is displayed on the right in the
relative humidity display sequence, under the word “HUMIDITY”. The
current Set point is displayed on the left, under the word “SET”.
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. Therma-Stor LLC recommends relative
humidity levels of 45% in the summer,and lower levels in the
winter. It 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.
FOR HVAC INSTALLER ONLY AND HOMEOWNER