SYSTEM OPERATION
6
SYSTEM STARTUP TEST
A system verification test is now required to check the
equipment settings and functionality.
18 SEER Inverter units are tested by any of the following
methods:
• Setting the “SUt” menu (System verification test) to
ON through the indoor unit control board push but-
tons.
• Setting the System verification test menu of mode dis
-
play screen-4 to ON through the outdoor unit control
board push buttons.
Once selected, it checks the equipment for approximately 5
- 15 minutes. System test may exceed 15 minutes if there is
an error. Refer to the Troubleshooting section, if error code
appears.
Before starting the SYSTEM TEST, turn off the electric
heater (if applicable)
NOTE: If the unit is attempting to run SYSTEM TEST in
under 20°F ambient temperature, the unit may not be able
to complete the test due to low suction pressure. In such a
case, re-run the SYSTEM TEST when the ambient tem-
perature exceeds 20° F.
CHARGE MODE
CHARGE mode allows for charging of the system.
System operates for a duration of approximately one hour
while the equipment runs at full capacity.
After one hour, the CHARGE MODE ends and the system
resumes normal operation.
Before starting the CHARGE MODE, turn off the Cool or
Heat mode and electric heat (if applicable).
a. 18 SEER Inverter units are charged by any of the follow-
ing methods:
• setting the “CR9” menu (Charge Mode) to ON through
the indoor unit control board push buttons.
• setting the Charge mode menu of mode display
screen-4 to ON through the outdoor unit control board
push buttons.
• Through the CoolCloud HVAC phone application.
b. The System will remain in charge mode (high speed) for
60 minutes before timing out.
c. Manually shut off.
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 temperature sensor located in the outdoor unit.
Please note that outdoor equipment operational sound lev-
els 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 adjust-
ed 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 but-
ton and selecting the Dealer Information button.
b. Once recorded, click the green OK button and
return to the revious 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 avail-
able to permanently engage BOOST MODE. Factory
default is 105°.
9. Once satisfied with BOOST MODE adjustments, nav
-
igate 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 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.
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 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:
