System Protection | 15Heat Pump Controller
8733819577 (2019/02)Heat Pump Controller Subject to change without prior notice
Fig. 2 Condensate Overflow Sensor Location
Discharge Air Temperature (DAT) Sensor
The DAT sensor is installed at the inlet attached to
a motor mount (leg) and connected to the HPC. It
reads the supplied air temperature to determine
whether the unit is operating in the correct state
(Heating or Cooling) per the thermostat demand.
The DAT works together with the Return Air
Temperature (RAT) sensor to determine if there is
a heating/cooling fault. These faults will appear on
the monitor interface when paired with the Bosch
EasyStart app. Location of the DAT Sensor is
shown in Fig. 3.
Fig. 3 DAT Sensor Location
Return Air Temperature (RAT) Sensor
The RAT sensor is installed in front of the filter
(bottom-right corner) and connected to the HPC. It
reads the RAT to determine whether the unit is
operating in the correct state according to the
thermostat demand. The RAT works together with
the DAT sensor to determine if there is a fault
either Not Cooling, Heating with Cooling Demand,
Not Heating, or Cooling with Heating Demand. This
information will appear on the monitor interface
when paired with the Bosch EasyStart app.
Fig. 4 RAT Sensor Factory Location
Proper operation of the unit requires field
modification the RAT sensor location by removing
the sensor from the provided clip, drilling a ~1/4"
hole 12"–18" from the evaporator coil in the
ductwork, and securing the RAT sensor in this hole
for the most accurate RAT readings as shown
below in Fig. 5.
Fig. 5 RAT Sensor Field Location
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