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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 removing 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 (directions 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
thermostat via the Dehumidification Equipment menu. De-
humidification 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 De-
humidification button is present, dehumidification 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
selecting 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.
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 NOT set to "OFF" through the
Installer Options menu and/or in the ComfortNet User
Menu (COOL SETUP).
- If except OFF, 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 STD and the cooling airflow
profile 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
Cool Airflow Trim.
- In addition, the system can have Enhanced
Dehumidification operation in setting "A", "B",
or "C" of "Dehum" based on dehumidification
demand.
- See the "Dehumidification Select" section of the
Installation Manual for more detail.
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