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 buttons.
•
Setting the System verification test menu of mode
display screen-4 to ON through the outdoor unit con-
trol 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 fol-
lowing 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.
DEHUMIDIFICATION
NOTE:
For regions with high humidity, it is strongly recom-
mend to use a thermostat with humidity sensor and dehu-
midification terminal.
Without this type of thermostat, dehumidification operation
does not work.
Dehumidification requires a thermostat capable of reading
the indoor humidity level and allowing the user to set a
dehumidification target.
The thermostat controls the humidity level of the condi-
tioned space using the cooling system. Dehumidification
is engaged whenever a cooling demand is present and
humidity levels are above the target level.
When this condition exists, the circulating fan output is re-
duced, increasing system run time, over cooling the evap-
orator coil and ultimately removing more humidity from the
structure than if only in cooling mode.
The thermostat may also allow for an additional overcool-
ing limit setting depending on the thermostat utilized. This
allows the cooling system to further reduce humidity by
lowering the temperature below the cooling setpoint in an
attempt to better achieve desired humidity levels.
DEHUMIDIFICATION TIPS
For effective dehumidification operation:
•
Ensure “Dehumidification selection” is NOT set to
“OFF”.
•
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, “Dehumidification selection” is standard
and the cooling airflow profile is set to “Profile D”.
•
For additional dehumidification control, airflow set
-
tings are field adjustable and can be fine-tuned to a
value that is comfortable for the application from a
range of Cool Airflow Trim.
COMFORTBRIDGE™ SYSTEM
OVERVIEW
The ComfortBridge based inverter heating and air condi-
tioning system uses an indoor unit and outdoor unit digitally
communicating with one another via a two-way communi-
cations path. ComfortBridge is compatible with any 24 VAC
single stage thermostat which send inputs to the indoor unit.
