Dehumidification - Daikin DX17VSS181AA Installation Instructions Manual

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 humid-
ity 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 (direction below).
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.
Sun
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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 "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
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
+15% to -15%.
- See the Air Conditioner Advanced Feature Menu
section of the Installation Manual for more detail.
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