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Siemens Building Technologies
HVAC Products
8
Basic diagram
8.1 LMU...
AC 230 V
Lockout
(STB, TB)
RAC 26 V
Safety
shutdown (GP)
RAC 26 V
Room thermostat
or time switch
RAC 26 V
Heating circuit
pressure monitor
RAC 26 V
DHW flow switch
or thermostat
RAC 26 V
Progr. digital input
for air pressure
monitor, for example
Boiler flow sensor
ϑ
(tested)
Boiler return
ϑ
sensor (tested)
DHW sensor 1 or
ϑ
thermostat
Water pressure
ϑ
sensor
ϑ
Outdoor sensor
Flue gas sensor /
ϑ
DHW sensor 2
Flame supervision
FE
(continuously)
The diagram shows the maximum functionality of the LMU... system. For the specific scope
of functions, refer to the relevant version / configuration !
Basic Documentation LMU54... / LMU64...
8 Basic diagram
PWM / Hall
4
6
AC 230 V
LMU...
PWM modulated
AC 230 V
AC 230 V
2
BV1
Fuel valves
AC 230 V or
RAC 230 V
BV2
Ignition module
(integrated)
Ignition module
AC 230 V
Variable speed
PWM fan
AC 230 V or DC 24 V
Stepper motor control
M
(combustion
optimization)
Heating circuit pump
DHW pump 1
or diverting valve
Stepper motor control
M
(diverting valve)
Programmable
output
Room unit QAA73
QAA53
HMI
Operating section
AGU2.3xx
CC1P7494en
07.11.2002
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