SYSTEM OPERATION
11
SYSTEM STARTUP TEST
A system test is now required to check the equipment settings
and functionality. 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 and gas furnace. NOTE: If the unit is
attempting to run SYSTEM TEST in under 20° F ambient tempera-
ture, 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 temperature exceeds 20° F.
SET THERMOSTAT TO CHARGE MODE
If required additional charging amount cannot be charged to
the system without operation, then use this “CHARGE MODE".
When adjusting "Sub cooling", use this "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 thermostat opera-
tion.
Before starting the CHARGE MODE, turn off the electric heater.
HEAT PUMP WITH OUTDOOR TEMPERATURE LOCKOUTS
It is recommended to set the outdoor temperature lockouts
during the initial themostat set up. Heat pump (compressor)
lockout temperature will enable the compressor to be turned off
and switch heating source from refrigeration to auxiliary/
secondary heating under low outdoor ambient conditions.
Auxiliary (Backup) heat lockout temperature will enable
auxiliary/secondary heating to be turned on when outdoor
temperature is much higher than indoor temperature,
compressor might stop operating under this circumstance.
Line Set Length Range
(ft.)
Compressor Lockout Temperature
(F°)
0 to 100 15
100 to 200 20
BOOST MODE
BOOST MODE enables the system to operate at a higher com-
pressor 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 levels may
increase while the equipment is running in BOOST MODE.
Disabling BOOST MODE will provide the quietest and most
efficient operation.
N INITIAL POWER STAR UP THE OUTDOOR UNIT WILL DISPLAY CODE
SIGNALING THAT INITIAL TEST MUST BE RUN OLLOW
THE HERMOSTAT SETUP SCREEN TO ENTER APPLICATION UNIQUE
INFORMATION EE THERMOSTAT MANUAL FOR DETAILED
INFORMATION
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NOTICE
NOTE: BOOST MODE applies to DZ20VC0**1AB or later model
revisions. 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.
For detailed procedure to access the these functions, please
visit the Daikin One+ Smart Thermostat website at http://
www.daikinone.com. If using a CTK04 thermostat, please see
the addendum for further instructions.
DEHUMIDIFICATION
The thermostat reads the indoor humidity level 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 thermostat also
allows for an additional overcooling limit setting from 0°F to 3°F
setup. 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.
DEHUMIDIFICATION TIPS*
For effective dehumidification operation:
• Ensure "Dehumidification" is not set to "OFF"
- For detailed procedure to access this function, please
visit the DAIKIN ONE+ Smart Thermostat website at
http://www.daikinone.com. If using a CTK04 thermo-
stat, please see the addendum for further instructioins.
• Verify the cooling airflow profile (cool profiles) is set to
"Profile D".
- See the Cool Set-up section of the Installation Manual
for complete airflow profile details.
- By default, "Dehumidification" is standard and the
cooling airflow profile is set to "ProfileD"
• 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 Cool
Airflow Trim.
• In addition, the system can have Enhanced
Dehumidification operation in setting "A", "B", or "C" of
dehumidification based on dehumidification demand.
- See the Dehumidification Select section for more de-
tail. *The specification of DZ20VC0241BD, 0361BC,
0481BC, and 0601BC or earlier models are different
from this specification. For details, see the
Installation Manual or Service Manual that matches
the Major and Minor revision of the model name.
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