Daikin DPS Installation And Maintenance Manual page 37

SAF Ctrl is an adjustable parameter used to select how the
supply fan is to be controlled . The supply fan can normally be
controlled by duct pressure, space temperature (single zone
VAV or 1ZnVAV) or by a percentage of supply air fan speed
from 33% to 100% . On 100% OA unit applications the fan can
be controlled to maintain building static pressure, space carbon
dioxide level or and airflow based on a field supply airflow
station . The speed option is typically used with a building
automation system . When single zone VAV control is selected,
the supply fan is controlled with a PI_Loop to maintain the
Control Temperature input at the Occupied Cooling Set Point
or Occupied Heating Set Point . When BSP is selected the
supply fan is controlled with a PI_Loop to maintain the building
static pressure at a building static pressure Set Point . When
CO is selected the supply fan is controlled to maintain the
2
CO ppm between adjustable limits by varying the supply fan
2
speed between an adjustable range . When CFM is selected
the supply fan is controlled with a PI_Loop to maintain the
measured CFM at a CFM set point .
AplyInputChgs is an adjustable item for applying changes
to the CO Input=, CFM Input= and BSP Input= parameters .
2
Applying the changes causes the controller to reset before the
changes can take effect .
CO Input is an adjustable item used to select the type of
2
input for a field installed CO
controller ignores any CO
2
or monitoring is desired this parameter is set to VDC or mA to
match the input type of the field supplied CO
This parameter applies only to 100% OA unit configurations.
CFM Input is an adjustable item used to select the type of
input for a field installed airflow station. If this is set to None the
controller ignores any field airflow station input. If CFM control
and/or monitoring is desired this parameter is set to VDC or mA
to match the input type of the field supplied airflow input. This
parameter applies only to 100% OA unit configurations.
BSP Input is an adjustable item used to select whether on
not a building static pressure sensor is connected to the unit
controller . If this is set to No the controller ignores any building
static pressure input . If BSP control of the supply fan is desired
this parameter must be set to Yes . This parameter applies only
to 100% OA unit configurations.
Remote SF Cap is an adjustable item for setting the supply fan
speed by the keypad or by a network control signal .
DSP DB is an adjustable item which sets a dead band around
the DuctSP Spt= parameter . No duct static pressure control
action is taken when the current duct static pressure input is
within this dead band .
SAF Ramp Time is an adjustable item that sets the amount
of time it will take for the variable speed fan to drive from
its minimum to maximum speed as well as its maximum to
minimum speed . The SAF Ramp Time= value on the keypad
must be changed whenever the ramp time of the variable
speed fan is changed . The ramp up time must equal the ramp
down time, and both must equal the SAF RampTime value to
provide stable operation .
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sensor . If this is set to None the
2
sensor input . If CO control and/
2
sensor input .
2
Min Period is an adjustable item that sets the duration of the
sample time between speed changes . The sample time must
be long enough to allow the static pressure to get very close to
its steady state value before another calculation is made .
Max Spd Chg is an adjustable item that sets the maximum
value for a speed increase or decrease . This speed change
(either a positive or negative value) is added to the current
fan speed whenever the duct static pressure is outside of the
deadband, and the Min Period time has passed since the
previous speed change .
DuctPress1 is a status only item that indicates the current
value for the duct status pressure sensor .
Min Clg Spd is an adjustable item that sets the minimum
supply fan speed used for cooling operation when 1ZnVAV is
selected as the method of supply fan control .
Max Clg Spd is an adjustable item that sets the maximum
supply fan speed used for cooling operation when 1ZnVAV is
selected as the method of supply fan control .
Min Htg Spd is an adjustable item that sets the minimum
supply fan speed used for heating operation when 1ZnVAV is
selected as the method of supply fan control .
Max Htg Spd is an adjustable item that sets the maximum
supply fan speed used for heating operation when 1ZnVAV is
selected as the method of supply fan control .
Space Period is an adjustable item that sets the "sampling
time" used in the PI control function to vary the supply fan
speed when 1ZnVAV supply fan control is selected .
Space Gain is an adjustable item that sets the "gain" used
in the PI control function to vary the supply fan speed when
1ZnVAV supply fan control is selected .
Space PAT is an adjustable item that sets the "project ahead
time" used in the PI control function to vary the supply fan
speed when 1ZnVAV supply fan control is selected .
Space Max Chg is an adjustable item that sets the maximum
value of increase or decrease of the supply fan speed each
period used in the PI control function to vary the supply fan
speed when 1ZnVAV supply fan control is selected .
37 OM 1141-3 • MICROTECH UNIT CONTROLLER
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