P.W. KEY rt-208gt, Operating Manual

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When the T1 sensor works as the outside temperature sensor, the value measured
is also shown in the top row of the display and marked with a house with a
thermometer outside.
When the additional sensor operates as the boiler temperature sensor, its symbol
and the value measured are shown in the bottom row of the display.
Tout from RK – the parameter allows the user to define whether the outside
temperature measured with the outside temperature sensor connected to the boiler
driver should be displayed by the room controller.
Tout to RK – the parameter allows the user to define whether the outside
temperature measured with the sensor connected to the room controller should be
read by the boiler driver.
Tb from RK – the parameter allows the user to define whether the boiler
temperature measured with the temperature sensor connected to the boiler driver
should be displayed by the room controller
14. Correction of sensors .
Long connecting cables might be the reason for faulty temperature measurements.
The parameter allows the user to make corrections to this malfunction. Select the
"Sensors correction" function in the user's menu and make any necessary changes
in the inside, outside and boiler temperature sensors. Turn the multifunctional knob
in each backlit indicator to select desired values.