Siemens LMU64 Series - 8 Basic diagram; 8.1 LMU...

110/171
Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en
HVAC Products 8 Basic diagram 07.11.2002
8 Basic diagram
8.1 LMU...
Lockout
(STB, TB)
Safety
shutdown (GP)
Boiler flow sensor
(tested)
Boiler return
sensor (tested)
DHW sensor 1 or
thermostat
Outdoor sensor
Room thermostat
or time switch
BV2
BV1
Ignition module
AC 230 V
Heating circuit pump
DHW pump 1
or diverting valve
4
Variable speed
PWM fan
AC 230 V or DC 24 V
ϑ
LMU...
Water pressure
sensor
Heating circuit
pressure monitor
Progr. digital input
for air pressure
monitor, for example
Ignition module
(integrated)
PWM / Hall
6
Stepper motor control
(combustion
optimization)
M
AC 230 V
PWM modulated
AC 230 V
Room unit QAA73
QAA53
Operating section
FEFlame supervision
(continuously)
Programmable
output
ϑ
Flue gas sensor /
DHW sensor 2
Fuel valves
AC 230 V or
RAC 230 V
Stepper motor control
(diverting valve)
M
ϑ
ϑ
ϑ
ϑ
RAC 26 V
AC 230 V
RAC 26 V
RAC 26 V
RAC 26 V
RAC 26 V
DHW flow switch
or thermostat
2
HMI
AGU2.3xx
7494a01E/1201
AC 230 V
The diagram shows the maximum functionality of the LMU... system. For the specific scope
of functions,
refer to the relevant version / configuration !