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Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en
HVAC Products 7 DHW control (BWR) 07.11.2002
User Heating engineer
Features Changing individual specific BMU parameters
Parameter types Non-safety-related parameter (refer to CC1B7494)
Parameter levels Heating engineer
Connection To LMU...-X30
For parameterization via QAA73... / AGU2.3..., refer to Operating Instructions
CC1B7494!
When setting the parameters with the help of the LMU... PC tool, a special programming
position is used. After setting the parameters, a reset must be made.
When setting the parameters via the RU, shutdown with a change to start prevention
takes place. After the parameters are set, operation can be resumed without having to
make a reset.
Before changed parameters are stored in EEPROM, the associated safeguarding values
(CRC, test values of transmission programs, plausibility of parameters) as well as the
permitted value range are checked.
The input for the air pressure switch (LP / X10-04) can also be used for other functions,
provided the burner control does not evaluate this input as an LP contact!
The LP contact is not evaluated by the burner control if «LPKon» = 1 («Input signal as
a programmable input») is set in parameter «FaEinstellFlags2».
Parameter «KonfigEingang» determines the function to be assigned to the
programmable input.
Using parameter «KonfigEingang», the following functions can be assigned to the
programmable input:
• 0 Default, programmable input function is not used
• 1 Modem function active when contact is closed
• 2 Modem function active when contact is open
• 3 Warm air curtain function
Using the modem function, the heating plant can be shut down from a central location or
be brought into the «Standby» mode. All protective functions (e.g. frost protection, pump
kicks) remain active.
RVA... controllers will automatically be switched to standby.
If the modem function is not active, that locking function will not be active either.
• When the modem function is active, frost protection for the room cannot be provided!
• When the modem function is active, the legionella function of the RU cannot be
provided!
The warm air curtain function raises the boiler temperature setpoint to the maximum
value «TkSmax». In addition, a heat demand signal for heating circuit 1 will be
delivered.
This function can be activated both in summer and winter operation.
• Modulation of burner output will be maintained
• DHW priority will be maintained
• The warm air curtain function is active when the contact is closed
• PWM pump control will not be affected
The limitation of HC1 is provided according to «TkSmin ≤ temperature demand HC1 ≤
TkSmax».
Note
Programmable input
of the LMU...
Modem function
Warm air curtain function
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