User Manual

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Building Technologies Division CC1N7491en
18.07.2018
Technical data (cont´d)
Ionization current DC switching threshold 0.45 µA (typically)
Possible ionization current Max. 11 µA
Short-circuit current Max. 51 µA
Response time in the event of loss of
flame
<1 s
Safety time «TSA» ′5 s
Repetition Max. 3
Connection PELV
Type Stocko: MKS1852-6-0-202
2 poles, coded
Connections are interchangeable and
short-circuit-proof
short-circuit might lead to activation of
special LMU34… functions
Lumberg: 2.5 MSF02(3114)
2 poles
Loads Connected to LMU34… PELV
Siemens AG system-internal connection
Function Interface (OpenTherm) for QAA73…
for more detailed information, refer to
OpenTherm specification and Basic
Documentation QAA73… (P2284)
Connection HT mains voltage connection (potential-
free)
Type Molex: 1008-5031
3 poles, coded
Loads AC 230 V
2 A, cosι 0.8 Imax
fusing max. T3.15H250 to IEC 60127
Assignment Pin 1: Relay NC contact
Pin 2: Relay NO contact
Pin 3: Relay COM contact
Function Changeover contact for control of heating
circuit zone pump / alarm message
NO contact closed when there is a heat
request from QAA73… / alarm
NC contact closed when there is no heat
request from QAA73… / alarm
External system components
External system components are devices such as
∂ Ignition equipment
∂ Fan
∂ Gas valve
∂ Flow switch Hall sensor DHW
∂ Heating circuit pump
The external system components used must be approved by Siemens AG!
Flame supervision with
ionization probe
Connector X800
Connector X301
(depending on the type
of LMU34)