User Manual

27/33
Building Technologies CC1N7491.1en
03.04.2018
Connectors list LMU34 (cont´d)
No.
Connector
type
Pin code
print on
PCB
Description LMU34.2 LMU34.3
X400
Lumberg
MSF 9 poles
PELV: Cable length ′ 1 m Cable length ′ 1 m
1 DHW temperature sensor
NTC 10 kς at 25 °C
beta = 3977
DC 5 V
NTC 10 kς at 25 °C
beta = 3977
DC 5 V
2 Outside temperature sensor
NTC 1 kς at 25 °C
beta = 3528
cable length ′ 40 m
NTC 1 kς at 25 °C
beta = 3528
cable lengths ′ 40 m
3
LMU34 type "A":
DHW temperature sensor 2
LMU34 type "B":
DHW Hall sensor / DHW flow switch IN
LMU34 type "A":
NTC 10 kς at 25 °C
Beta = 3977
LMU34 type "B":
Open-circuit condition:
Vout = DC 7.5 V
Closed-circuit condition:
Iout < 1 mA
Uin < 0.5 V
Open-circuit condition:
Vout = DC 7.5 V
Closed-circuit condition:
Iout < 1 mA
Uin < 0.5 V
4 DHW temperature sensor NTC 10 kς at 25 °C
beta = 3977
max. DC 5 V
NTC 10 kς at 25 °C
beta = 3977
max. DC 5 V
5 Outside temperature sensor NTC 1 kς at 25 °C
beta = 3528
cable length ′ 40 m
NTC 1 kς at 25 °C
beta = 3528
cable length ′ 40 m
6 DHW Hall sensor / DHW flow switch GND GND GND
7
DHW Hall sensor / CH primary flow switch
supply
DC 7.5 V
(max. 24 mA)
DC 7.5 V
(max. 24 mA)
8
CH primary flow switch / water pressure
switch / bridge
DC 7.5 V
< 2 mA
DC 7.5 V
< 2 mA
9
CH primary flow switch / water pressure
switch / bridge
GND GND
PELV: Protective Extra Low Voltage – Low voltage connection
The unit is supplied with the temperature setpoint potentiometer in the OFF position.
¹) Only use components approved by Siemens AG!
²) A special conversion list (hard copy) must be used to retrieve correct measurement
values and to set correct threshold values to related functions
³) The fan must meet the requirements of specification
LMU5x_TrafoFan_en_V1.2.doc, chapter 3 “Specification for fans with mains voltage
operated DC motor”