Daikin MICROTECH DPSA Operation Manual page 5

QUICK START GUIDE
1 . Supply Fan Operation and Supply Fan
Start / Stop Input
The field provided controller shall send supply fan control signals
to the MicroTech unit controller. The field controller must supply a
0-10 VDC signal to the appropriate input terminal depending on
the specific unit type. The signal type can be changed to 4-20 mA
in the MicroTech unit controller.
An input of 0 V (4 mA) is no fan movement, an input of 10 V (20
mA) is maximum fan output. The signal will control the speed of
all supply fans simultaneously.
Figure 2: Supply Fan Capacity Input Schematic
CAUTION
The supply fan must have unobstructed airflow before sending a signal to
command the fan speed to avoid damage. For 100% outside air (OA) units, the
OA dampers must be fully actuated to the Open position by the field supplied
controller. Not opening the dampers for unobstructed airflow will cause damage
to the unit by over pressurizing the cabinet.
NOTICE
Daikin Applied is not responsible for damage to the unit due to improper control
of the dampers.
2 . Outside Air Damper Operation (Non-
DOAS)
The field provided controller shall send an Outside Air Damper
control signal to the MicroTech unit controller. The field controller
must supply a 2-10 VDC signal to the appropriate input terminal
depending on the specific unit type. The signal type can be
changed to 4-20 mA in the MicroTech unit controller. See page 5
of unit wiring diagram for details.
An input of 0 VDC (4 mA) sets the outside air damper to the
CLOSED position, and an input of 10VDC (20 mA) sets the
outside air damper to the 100% OPEN position.
Figure 3: Outside Air Damper Operation (Non- DOAS)
Schematic
OM 1401
3 . Return or Exhaust Fan Operation and
Stop / Start Input
The field provided controller shall send return/exhaust fan control
signals to the MicroTech unit controller. The field controller
must supply a 0-10VDC signal to the appropriate input terminal
depending on the specific unit type. The signal type can be
changed to 4-20 mA in the MicroTech unit controller.
An input of 0 VDC (4 mA) is no fan movement, an input of 10
VDC (20 mA) is maximum fan output. See page 5 of unit wiring
diagram for details.
Figure 4: Return or Exhaust Fan Capacity Schematic
4 . Cooling System Interlock Input
This input can be used to prevent compressor operation based
on external system safeties (an airflow proving switch for
example). When this input is Open, compressor operation is
disabled.
Figure 5: Return or Exhaust Fan Capacity Schematic
5 . Heat Pump Models Only - Compressor
Cooling or Heating Selection Input
The digital input can be used to open or close the heat pump
reversing valve. The normally open contact can be closed by
a field digital output to reverse the four way valve and enable
compressorized heating. The digital input will be ignored if the
unit has entered defrost.
Figure 6: Heat/Cool Mode Input Schematic
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