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Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en
HVAC Products 1 Overview 07.11.2002
• Integrated DHW systems with specific algorithms for storage tank, stratification
storage tank, instantaneous and aquabooster systems
• Instantaneous DHW heating systems with optional comfort function
• DHW heating with charging pump / diverting valve
• Diverting valve control via stepper motor control, N.O. contact with continuous phase
or changeover contact
• DHW control with sensor or thermostat
• Control of DHW circulating pump with QAA73...-V1.4
• Integrated weather-compensated pump heating circuit
• PWM-controlled heating circuit pump with specific algorithms to ensure most effective
condensation, improved overall efficiency and enhanced room comfort (optional)
• Additional weather-compensated heating circuit for single-user applications via
modular clip-in add-on module AGU2.500 (pump or mixing heating circuit) with
independent minimum / maximum limitation and heating curve.
Independent time switch program in connection with the QAA73...
• Automatic summer / winter changeover
• Automatic 24-hour heating limit (with no RU connected)
• Quick setback (with no RU connected)
• Compensation variants with room thermostat / time switch (single- or dual-channel
time switch)
• Compensation variants with room controls via integrated interface based on
OpenTherm (QAA73... / QAA53...)
• Integrated interface on OpenTherm basis
• Communication capability via the Local Process Bus (LPB) by means of clip-in
module
• Consistent system architecture of RVA… controllers
• Optional remote supervision
• Connection via LPB clip-in module to
− RVA46... zone controllers
− RVA47... cascade controllers
− RVA63... boiler and heating circuit controllers
− RVA65... energy managers for solar, wood, etc.
− RVA66... boiler and heating circuit controllers
− OCI6... communication interface for remote supervision (in connection with
appropriate ACS… software)
1)
• Modular and flexible concept of operating units AGU2.3...; optionally with housings for
flush panel mounting, degree of protection IPX4D (splash-proof) and LCD model with
clock function and backlit display
• Chimney sweep function
• Controller stop function for output adjustment
• Error messages with lockout storage and fault history
• Display and interrogation of all relevant process parameters via operating units,
QAA73... and PC tool
• Counter for the number of startups and the number of operating hours
• Maintenance functions with service message
1)
• Automatic plant configuration (identification of RU, connected HMI, sensors, etc.)
1) Planned; on request
DHW
Heating circuit
System application
Operation / service
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