Daikin ARQ Installation And Maintenance Manual page 24

9 . Outdoor Air/Return Air Damper Actuator (A1): Proportional,
direct coupled actuator that spring returns the outdoor air
damper to the closed position upon a loss of power.
10 . Low Refrigerant Temperature Sensor (ICT): This sensor is
provided on all units with a direct expansion (DX) cooling coil.
It is located on the right hand side of the air coil "u-bend".
11 . Room Temperature Sensor (RAT): The unit mounted
sensor is located in the sampling chamber (front, center
section) where room air is continuously drawn through for
prompt response to temperature changes in the room. A
Remote Wall Mounted Temperature Sensor is also available
for remote room temperature sensing. (optional accessory).
12 . Discharge Air Temperature Sensor (DAT): The sensor
is located on the second fan from the right to sense
discharge air temperatures.
Figure 40: MicroTech Unit Ventilator Controller (UVC)
Figure 41: Top view - Local User Interface (LUI)
compartment
13 Outdoor Air Temperature Sensor (OAT): The sensor
is located in the outdoor air section of the unit before the
outdoor air damper. With network applications, the unit
mounted sensor can be overridden by a remote sensor
through the network.
14 . Outdoor Air Humidity Sensor (OH) (optional): Unit
mounted humidity sensor for units using Expanded
outdoor enthalpy economizer or Leading Edge indoor/
outdoor, true enthalpy comparison economizer. The
sensor is located in the outdoor air section of the unit
before the outdoor air damper. With network applications,
the unit mounted sensor can be overridden by a remote
sensor through the network.
IM 1083-3
15 . Room Humidity Sensor (IH) (optional): Unit
mounted humidity sensor for units capable of active
dehumidification or with units using Leading Edge indoor/
outdoor, true enthalpy comparison economizer. The
sensor is located in the sampling chamber (front, center
panel) where room air is continuously drawn through
for fast response to humidity changes in the room. With
network applications, the unit mounted sensor can be
overridden by a remote sensor through the network.
16 . CO Sensor (CO2) (optional): Unit mounted, single beam
2
absorption infrared gas sensor with a sensing range of
0 – 2000 ppm and voltage output of 0 to 10 VDC (100
ohm output impedance). The Pitot Tube sensing device
is located in the unit ventilator's return air stream. The
optional CO sensor is used with the UVC's Demand
2
Control Ventilation feature to vary the amount of outside
air based on actual room occupancy. With network
applications, the unit mounted sensor can be overridden
by a remote sensor through the network.
17 . Water Out Temperature Sensor (LWT): The water out
temperature sensor is factory wired. The sensor must be
field-installed and insulated (by others) and located on the
return connection of the plate heat exchanger.
18 . Water Coil DX Temperature Sensor (OCT): This sensor
is factory wired, installed and insulated. It is located on
the lower left refrigerant line of the plate heat exchanger
leading to the expansion valve.
NOTICE
Not all external signal options can be used simultaneously and
may not be available on all software models.
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