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Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en
HVAC Products 3 Functions 07.11.2002
Under certain conditions, the fan parameters for ignition load, partial load and full load
can also be set via the QAA73... (parameter «FaEinstellFlags3»).
Since these fan parameters are safety-related and – as a general rule – safety-related
values cannot be readjusted via the QAA73..., following applies:
• The relevant parameters will be copied and the new parameters filed in the non-
safety-related range
• Changeover between the 2 parameter groups can be parameterized via a safety-
related flag (FaEinstellFlags3)
Changeover to the QAA fan parameters is only permitted under certain preconditions:
1. Capacity range < 70 kW.
2. Changeover only possible on the OEM level or higher.
For the new parameters, the usual fan parameter checks are made (same as with the
previous parameter group).
Listing of both parameter groups:
Parameters on QAA Safety-related parameters
LmodZL_QAA LmodZL
LmodTL_QAA LmodTL
LmodVL_QAA LmodVL
N_ZL_QAA N_ZL
N_TL_QAA N_TL
N_VL_QAA N_VL
When setting these parameters, the following general conditions must be observed:
QAA parameters: CRC-protected parameter:
LmodZL_QAA ≤ LmodZL
LmodVL_QAA ≤ LmodVL
LmodTL_QAA ≥ LmodTL
N_ZL_QAA ≤ N_ZL
N_VL_QAA ≤ N_VL
N_TL_QAA ≥ N_TL
When, in the following, reference is made to one of the safety-related parameters, it is
also possible that the corresponding QAA parameter is meant (depending on the
parameterization).
Fan parameters
accessible via QAA
Note
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