Cooling Set-Up - Daikin DPS Installation And Maintenance Manual

Cooling Set-Up

(See page 106 for more information)
Table 25: Cooling Set-up Menu
Item Display Default
Name Setting
Clg Stage Time= 5min
Clg DB= 2 .0°F
Clg Lo OAT Lk= 55°F
OAT Diff= 2°F
Clg Reset= None
Min Clg Spt= 65 .0°F
Min Clg Spt @= 0/NA
Max Clg Spt= 65 .0°F
Max Clg Spt @= 100/NA
Unocc Diff= 3°F
Clg Stage Time is an adjustable item used to set a minimum
time period between compressor stage changes .
Clg DB is an adjustable item which sets a dead band around
the discharge cooling set point parameter . For example, if the
discharge cooling set point parameter is set to 55ºF and the
Clg Db parameter is set to 2ºF the dead band around the set
point would be from 56 .0ºF to 54 .0ºF .
Clg Lo OAT Lk is an adjustable item which sets the low
outdoor air temperature mechanical cooling lockout point .
Mechanical cooling operation is disabled when the outdoor air
temperature sensor input falls below this set point .
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Range
Level
5–60min 4
1 .0–10 .0°F 4
0–100°F 4
0–10°F 4
None
Ntwrk
Space
Return
6
OAT
ExtmA
ExtV
Airflow
40 .0–100 .0°F 6
0–100/
NA
°F
6
°C
mA
%
40 .0–100 .0°F 6
0–100/
NA
°F
6
°C
mA
%
0–10°F 2
OATDiff is an adjustable item which sets a differential above
the OAT Clg Lock parameter . Mechanical cooling operation is
re-enabled when the outdoor air temperature sensor input rises
above the OAT Clg Lock value by more than this differential .
Clg Reset is an adjustable item that is used to set the type of
cooling reset to be used .
Min Clg Spt is an adjustable item which sets the minimum
cooling discharge set point for use with a cooling discharge air
temperature set point reset schedule .
Min Clg Spt @ is an adjustable item which sets the value of
the sensor input, selected with the Cooling Reset parameter,
at which the DAT cooling set point parameter is reset to the
minimum DAT cooling set point value .
Max Clg Spt is an adjustable item which sets the maximum
cooling discharge set point for use with a cooling discharge air
temperature set point reset schedule .
Max Clg Spt @ is an adjustable item which sets the value of
the sensor input, selected with the Cooling Reset parameter,
at which the DAT cooling set point parameter is reset to the
maximum DAT cooling set point value .
Figure 13 graphically shows the cooling reset operation . The
normal DAT cooling set point is 55 .0 F . The cooling reset
scheme is set to airflow. The unit is to adjust the DAT from 55.0
F to 65.0 F. When the unit is at 35% of the design airflow the
discharge temperature is to be 65 .0 F . When the unit is at 80%
of its airflow the DAT is to be 55.0F. This example would give
the following inputs:
• Min Clg Spt= 55 .0 F
• Min Clg Spt @= 80%
• Max Clg Spt= 65 .0 F
• Max Clg Spt @= 35%
Based on the above, the unit will have a discharge air
temperature set point of 55 .0 F from 80% to 100% of the
airflow.
Unocc Diff is an adjustable item that sets the unoccupied
cooling differential .
Figure 13: Cooling Set Point
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