Commissioning; Calibrating The Display Of The Actual Temperature Value (Applies Only To Uta Devices); Offset Function (Scale Correction) - ABB 1795 500 Series Operating Instructions Manual

Operating Instructions
Temperaturregler
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8

Commissioning

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Notes on commissioning
After the installation the accuracy of the switching point is established only after an operating
period of 1 to 2 hours.
For faster heating and alignment of the room temperature to the setpoint temperature, it is
recommended to initially set the temperature higher than required.
8.1

Calibrating the display of the actual temperature value (applies only to UTA devices)

To properly control loads larger than 2 A, the heating system must be connected for calibrating the display. After
the connection, the heating system is switched on automatically for about 20 minutes. During this time, the "CA"
symbol will be displayed. After this, the display adjusts itself to the room temperature within a few minutes.
Before repeating the calibration procedure, the unit must be disconnected from the power supply for at least 8
minutes.
8.2 Offset function (scale correction)
Reaching the selected room temperature depends on the ambient conditions such as heating system capacity (at
least 5°K/h min.), room size, ambient temperature, insulation, etc. That is why the values in the scale are merely
guide values. To obtain a setting that is as accurate as possible, the adjusting knob can be offset in 4 stages by a
total of ±6°C as follows. Compare illustration 4:
1. Pull off the adjusting knob (3).
2. Cut the position lug (1) on the bottom side of the adjusting knob off with a suitable tool.
3. Re-attach the adjusting knob, which has been offset to the basic position with the desired correcting value.
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Operating Instructions | 1473-1-8290
Commissioning
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