SYSTEM OPERATION
15
6. Scroll down and select Dehumidification.
7. Once open select Dehumidification Equipment: None.
8. From the Dehumidification Menu select A/C with Low Speed
Fan and click the green Done button.
9. Additional Dehumidification operational options can be
selected in the resulting window.
10. Once satisfied with the selection, navigate to the HOME
screen by selecting the Done button and selecting Yes to
verify the changes.
11. Select Previous Menu, then the HOME to return to the main
menu.
DEHUMIDIFICATION TIPS
For effective dehumidification operation:
•
Ensure “Dehum” is ON through the Installer Options menu
and/or in the ComfortNet User Menu (COOL SETUP).
-
If ON, the Dehumidification menu should be visible in
the main menu.
•
Verify the cooling airflow profile is set to “Profile D”.
-
See the Cool Set-up section of the Installation Manual
for complete airflow profile details.
-
By default, “Dehum” is ON and the cooling airflow pro-
file is set to “Profile D”.
•
For additional dehumidification control, airflow settings
are field adjustable and can be fine-tuned to a value
that is comfortable for the application from a range of
+15% to -15%.
-
See the Heat Pump Advanced Feature Menu section of
the Installation Manual for more detail.
Liquid refrigerant at condensing pressure and temperatures leaves
the outdoor condensing coil through the drier and is metered into
the indoor coil through the metering device. As the cool, low pres-
sure, saturated refrigerant enters the tubes of the indoor coil, a
portion of the liquid immediately vaporizes. It continues to soak
9.
Once satisfied with BOOST MODE adjustments, navigate to
the HOME screen by selecting the Previous Menu button
three times then selecting HOME.
DEHUMIDIFICATION
The thermostat reads the indoor humidity level from the CTK04
and allows the user to set a dehumidification target based on
these settings. The thermostat controls the humidity level of the
conditioned space using the cooling system. Dehumidification is
engaged whenever a cooling demand is present and structural
humidity levels are above the target level. When this condition
exists, the circulating fan output is reduced, increasing system
run time, over cooling the evaporator coil and ultimately remov-
ing more humidity from the structure than if only in cooling mode.
The CTK04 also allows for an additional overcooling limit setting
from 0°F to 3°F setup through the Installer Option menu (direc-
tions following). This allows the cooling system to further reduce
humidity by lowering the temperature up to 3°F below the cooling
setpoint in an attempt to better achieve desired humidity levels.
By default, dehumidification needs to be turned ON at the thermo-
stat via the Dehumidification Equipment menu. Dehumidification
can be activated at the original equipment setup by selecting the
A/C with Low Speed Fan button in the Dehumidification Menu.
Availability can be verified by pressing MENU on the home screen.
Scroll down and if a Dehumidification button is present, dehu-
midification is activated.
If Dehumidification is not available in the menu then it must be
enabled through the Installer Options menu. Use the following
procedure to enable and disable dehumidification:
1. On the CTK04 HOME screen select MENU.
2. From the MENU screen, scroll down and select Installer
Options.
3. Enter installer password if known.
a.
The password is the thermostat date code and can be
obtained by selecting the red Cancel button and select-
ing the Dealer Information button.
b.
Once recorded, click the green OK button and return to
the previous step.
4. Select YES to continue.
5. Select View / Edit Current Setup.