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Siemens Building Technologies Basic Documentation RVA47.320 CE1P2379E
HVAC Products Description of the heating engineer settings 15.07.2002
4.46 Exemption from automatic changeover of
the boiler sequence
• Individual boilers can be exempted from automatic changeover
Use this function if you want to operate a certain boiler as the first and / or last boiler of
the switching on sequence.
1. Press the operating line selection buttons to select line 131.
2. Press the + / – button to enter the boiler(s) to be exempted from automatic
changeover.
Setting range Unit Factory setting
0...3 - 0
Setting this parameter has an effect only if, on operating line ”Changeover of boiler
sequence in a cascade” (line 130), setting ”Automatic changeover according to the
number of operating hours” (10...990 h) has been selected.
Depending on the selected setting, the respective boiler will be exempted from
automatic changeover of the boiler sequence.
Entry:
0 No exemption.
The switching on sequence of the boilers will change on completion of the number
of operating hours set (line 130).
1 The first boiler is exempted.
The first boiler in the addressing scheme always remains the lead boiler. With the
other boilers, the switching on sequence changes when the set number of
operating hours have elapsed (line 130).
2 The last boiler is exempted.
The last boiler in the addressing scheme always remains the last boiler. The other
boilers will be switched over on completion of the number of operating hours set
(line 130).
3 The first and the last boiler are exempted.
The first boiler in the addressing scheme always remains the lead boiler. the last
boiler in the addressing scheme always remains the last boiler. The boilers in
between will be switched over on completion of the number of operating hours set
(line 130).
The boiler sequence is to be determined on operating lines ”Device address” (line 140)
and ”Segment address” (line 141).
Benefit
Description
Setting
Important
Effect
Note
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