10
BOOST MODE
BOOST MODE enables the system to operate at a higher
compressor speed than rated maximum compressor speed and
satisfy the structural load more effectively during higher ambient
outdoor conditions. BOOST MODE is initiated by an outdoor tem-
perature sensor located in the outdoor unit. Please note that out-
door equipment operational sound levels may increase while the
equipment is running in BOOST MODE. Disabling BOOST MODE
will provide the quietest and most efficient operation.
NOTE: BOOST MODE performance is most effective when paired
with an electronic expansion valve enabled indoor unit.
BOOST MODE is ON by default and is activated when the outdoor
temperature reaches 105°F. BOOST MODE can be disabled and
enabled and the activation temperature adjusted in BOOST TEMP
menu using the following procedure:
1. On the HOME screen, select MENU.
2. From the MENU screen, select COMFORTNET™ USER MENU.
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 HEAT PUMP.
6. Select SYS SETUP.
7. BOOST MD turns BOOST MODE OFF or ON. BOOST MODE is
ON by default.
8. BOOST TEMP adjusts the activation temperature from 70°F
to 105°F. "Always ON" option is also available to perma-
nently engage BOOST MODE. Factory default is 105°.
9. Once satisfied with BOOST MODE adjustments, navigate to
the HOME screen by selecting the Previous Menu button
three times and 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 remov
ing 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 (direc-
tion below). This allows the cooling system to further reduce hu-
midity 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 thermo-
stat via the Dehumidification Equipment menu. Dehumidification
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 Dehumidification button is present dehu-
midification 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
the main menu.
• Verify the cooling airflow profile is set to “Profile D”.
- See the Cool Set-up section of the Installation Manual
for com comlete 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 Heat Pump Advanced Feature Menu
section of the Installation Manual for more detail.
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