GVZC20 Installation Manual

51
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 dehumidication target
based on these settings. The thermostat controls the
humidity level of the conditioned space using the cooling
system. Dehumidi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, 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, dehumidication needs to be turned ON at the
thermostat via the Dehumidication Equipment menu. De-
humidication can be activated at the original equipment
setup by selecting the A/C with Low Speed Fan button in
the Dehumidication Menu. Availability can be veried by
pressing MENU on the home screen. Scroll down and if a De-
humidication button is present, dehumidication is activated.
If Dehumidication is not available in the menu then it must
be enabled through the Installer Options menu. Use the
following procedure to enable and disable dehumidication:
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 Dehumidication.
7. Once open select Dehumidication Equipment: None.
8. From the Dehumidication Menu select A/C with Low
Speed Fan and click the green Done button.
9. Additional Dehumidication operational options can be
selected in the resulting window.
10. Once satised 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 e󰀨ective dehumidication 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 Dehumidication menu should
be visible in the main menu.
• Verify the cooling airow prole is set to “Prole D”.
• See the Cool Set-up section of the Installation
Manual for complete airow prole details.
• By default, “Dehum” is STD and the cooling airow
prole is set to “Prole D”.
• For additional dehumidication control, airow settings
are eld adjustable and can be ne-tuned to a value
that is comfortable for the application from a range of
Cool Airow Trim.
- In addition, the system can have Enhanced
Dehumidication operation in setting “A”, “B”,
or “C” of “Dehum” based on dehumidication
demand.
 See the “Dehumidication Select” section of the
Installation Manual for more detail.