Boost Mode - Daikin DX17VSS Series Installation Instructions Manual

compressor reduction Mode: The compressor is running
at a speed lower than what is requested, based on the cool-
ing load.
requested and Actual % demand: Compares the requested
cooling demand to what the equipment is providing. For steady
state operation, these number should match.
requested and reported id cfM: Compares the requested
indoor airflow to what the indoor equipment has reported.
outdoor Air temperature and outdoor fan rPM: Displays
the outdoor air temperature as well as the outdoor fan speed
(rPM).
discharge temperature and outdoor coil temperature:
Displays the discharge temperature and outdoor coil tem-
perature sensor readings.
outdoor liquid temperature: Displays Outdoor liquid tem-
perature sensor readings.
Pressure Sensor and outdoor Suction temperature: Dis-
plays the pressure sensor and outdoor suction temperature
sensor reading.
note: oil return Mode: In order to properly return oil to the
compressor, compressor speed may periodically be adjusted
to assist oil circulation.
S S (SyS Set up1 and SyS Set
yStem etup
up2)
This menu allows for the setting of BOOST MODE and NIGHT
MODE. BOOST MODE enables the system to operate at a
higher compressor speed than maximum compressor speed.
NIGHT MODE enables the system to operate at decreased
compressor and fan speeds.
BOOST MODE temperature can be adjusted in "BOOST
TEMP" menu. When ambient temperature gets higher than
BOOST MODE temperature, the system will operate in

BOOST MODE.

CHARGE MODE can be enabled within this menu.
e t (equIp teSt)
quIpment eSt
The mandatory system verification test is enabled from this
menu, which enables a functional check of the equipment, in
addition to ensuring proper stop valve position.
c S -
ool et up
This menu allows for the adjustment of several cooling per-
formance variables. "Cool Airflow Trim" (range from -15% to
+15% in 3% increments), "Cool Airflow Profiles", "Cool Fan
ON Delay", "Cool Fan OFF Delay" and "Dehumidification
Select" (enable or disable dehumidification) can be adjusted
in this menu. You can also reset this entire menu to factory
default settings. See the following images showing the four
cooling airflow profiles.
• Profile A provides only an OFF delay of one (1) minute
at 100% of the cooling demand airflow.
100% CFM
OFF
Cooling Demand
• Profile B ramps up to full cooling demand airflow
by first stepping up to 50% of the full demand for
30 seconds. The motor then ramps to 100% of the
required airflow. A one (1) minute OFF delay at 100%
of the cooling airflow.
50% CFM
OFF
1/2 min
Cooling Demand
• Profile C ramps up to 82% of the full cooling demand
airflow and operates there for approximately 7 1/2 minutes.
The motor then steps up to the full demand airflow. Profile
C also has a one (1) minute 100% OFF delay.
82% CFM
OFF
7 1/2 min
Cooling Demand
Profile D (default) ramps up to 50% of the demand
•
for 1/2 minute, then ramps to 82% of the full cooling
demand airflow and operates there for approximately
7 1/2 minutes. The motor then steps up to the full
demand airflow. Profile D has a 1/2 minute at 50%
airflow OFF delay.
82% CFM
OFF
50% CFM
1/2 min 7 1/2 min
Cooling Demand
See service manual for more detailed information.
c r v
ool un alueS
Depending on the system configuration, adjusting the maxi-
mum compressor RPS (revolutions per second) may be re-
quired. Necessary adjustments to the maximum compressor
RPS are made through the following sub-menus.
c rpS r
ool ange
→ m c
axImum ompreSSor
Select the range that your maximum compressor RPS
falls within.
c rpS S
ool elect
→ m c
axImum ompreSSor
Within the selected range, choose the specific maximum
compressor RPS for the system configuration.
note: Under high ambient, the unit may ramp down com-
pressor RPS by protection, even max RPS is changed higher
by this menu.
It may be under Compressor Reduction Mode.
29
100% CFM
1 min
100% CFM 100% CFM
1 min
100% CFM 100% CFM
1 min
100% CFM
50% CFM
1/2 min
Airflow Tables
rpS r c
ange for oolIng
rpS S c
electIon for oolIng
OFF
OFF
OFF
OFF