Daikin DZ18VC Series Installation Instructions Manual page 41

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 Dehumidifi-
cation 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 ON through the Installer Options
menu and/or in the ComfortNet User Menu (COOL
SETUP).
- If ON, the Dehumidification menu should be visible
in
• Verify the cooling airflow profile is set to "Profile D".
- See the Cool Set-up section of the Installation
Manual
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 Heat Pump Advanced Feature Menu
for more detail.
ComfortNet™ System
Overview
A ComfortNet inverter heating and air conditioning system
uses an indoor unit, outdoor unit and thermostat which digitally
communicate with one another via a two-way communica-
tions path. The thermostat sends commands to the indoor
and outdoor units. The thermostat may request and receive
information from both the indoor and outdoor units. This in-
formation may be displayed on the CTK04 thermostat. The
indoor and outdoor units also interact with one another. The
outdoor unit may send commands to or request information
from the indoor unit. This two-way digital communications
between the thermostat and subsystems (indoor/outdoor unit)
41
the main menu.
for com comlete airflow profile
section of the Installation Manual