19
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. Dehumidifi-
cation 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, increas-
ing system run time, over cooling the evaporator coil and ulti-
mately 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 tem-
perature 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 ther-
mostat via the Dehumidification Equipment menu. Dehumidi-
fication can be activated at the original equipment setup by
selecting the A/C with Low Speed Fan button in the Dehumidi-
fication Menu. Availability can be verified by pressing MENU
on the home screen. Scroll down and if a Dehumidification
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 fol-
lowing 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 re-
turn 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 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.
