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Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en
HVAC Products 1 Overview 07.11.2002
• Via PC tool ACS420
• Via room unit QAA73...
• Via operating units AGU2.3...
• Via specific final production test tool ACS421
• Mains transformer integrated in the unit
An additional external transformer is not absolutely required (only when using a fan
operating on DC 24 V, or in the case of stepper motor control).
• Multifunctional housing with mechanical attachment facility for maximum 2 clip-in
modules
− Integrated exchangeable main fuse AC 230 V
− Integrated installer interface via RAST5 connector
• Optional extensions with up to 2 flexible clip-in modules that can be matched to
individual customer needs
• Programmable relay output (AC 230 V) for specific functions
• Programmable digital input for specific functions
• Housing / clip-in modules of advanced design made of recyclable plastic
1.3 Product range
Refer to chapter 2, «Product range overview».
1.4 Field of use
The LMU... are designed for use by OEMs. They are supplied directly to the boiler
manufacturer and enhance both the functionality and the level of outfit of gas-fired
boilers.
Suited for all types of standard heating systems such as radiator or underfloor heating
systems in the residential sector (one-family houses or blocks of flats).
Primarily for use with:
• Premixing or condensing gas-fired appliances with modulating burners using PWM
DC fans and pneumatic fuel / air ratio control, in intermittent operation and with direct
ignition of the main flame
• Capacity ranges < 70 kW, 70...120 kW, or > 120 kW
• Heating boilers or combi boilers with DHW storage tanks or instantaneous DHW
heaters
Parameterization
Mains transformer
Other features
Target market
Heating plants
Heat generating
equipment
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