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Siemens Schweiz AG User Manual CE1U2354en
HVAC Products QAA75.. / QAA78… / AVS37.. 23. August 2007
A list of possible displays is given on page 150.
The reset function for meters and the resettable parameters appears on the bottom line
of the display, provided a reset is permitted on the current operating line (end user /
commissioning / heating engineer).
0
4 8 12 16 20 24
2359Z140
Reset ? yes
After activation with the OK button, the display will show a flashing “Yes“.
0
4 8 12 16 20 24
2359Z140
Reset ?
yes
After confirmation with the OK button, the relevant parameter or counter will be reset.
When manual operation is active, the relays are no longer energized and deenergized
according to the control state, but are set to a predefined manual operation state
depending on their function.
The burner relay energized in manual control can be deenergized by the electronic
temperature controller (TR).
After manual control has been activated, a change to the basic display must be made.
There, the maintenance / special mode symbol
appears.
Press the info button to switch to info display “Manual mode“, where the setpoint can be
adjusted.
The chimney sweep function is activated by a short press (maximum 3 seconds) on the
chimney sweep button. This function produces the operating state required to make
emission measurements (flue gas).
The SLT test (SLT = safety limit thermostat) is activated by a long press (longer than 3
seconds) on the chimney sweep button. The button must be kept depressed during the
entire test. If released, the test will be aborted. The SLT test is shown on the display.
The test may only be made by qualified staff since the boiler temperature will be raised
above the maximum limits.
Reset function
Manual operation
Setpoint adjustment in
manual control
Chimney sweep function
SLT test
40


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