Installation Notes - Siemens LMV37.4 Series Basic Documentation

12/267
Building Technologies
1.3

Installation notes


Always run the high-voltage ignition cables separate from the unit and other cables
while observing the greatest possible distances

Ensure that the electrical wiring inside the boiler is in compliance with national and
local safety regulations

Mains power must always be supplied via L and N. This means that no potential
differential must exist between the neutral conductor N and protective conductor PE

Phase and neutral conductor must not be interchanged (dangerous malfunctions,
loss of protection against electric shock hazard, etc.)

Make certain that strain relief of the connected cables is in compliance with the
relevant standards (e.g. as per DIN EN 60730 and DIN EN 60335)

Ensure that spliced wires cannot get into contact with neighboring terminals. Use
adequate ferrules

The burner manufacturer must protect unused terminals of the LMV37.4 by fitting
dummy plugs (exception: X64 (reserve) and X74)

When making the wiring, the AC 120 V or AC 230 V section must be strictly
separated from other voltage sections, thus ensuring protection against electric
shock hazard. For more detailed information, refer to chapter Electrical connection
of the LMV37.4

The connectors of the connecting cables for the LMV37.4 may only be removed or
exchanged when the plant is turned off (all-polar disconnection), since the BCI
interface does not provide safe separation from mains voltage

AGV50 signal cable between LMV37.4 and AZL2
Since the BCI carries FELV (refer to chapter Electrical connection of the LMV37.4),
the connection between LMV37.4 and AZL2 must be established via the AGV50
signal cable, or by ensuring compliance with the specification. The signal cable is
specified for use under the burner hood. When using other types of signal cable that
do not meet the specification requirements, safety against electric shock hazard is
not necessarily ensured

Do not lay signal cable AGV50 from the LMV37.4 to the AZL2 together with other
cables

Service operation with a longer signal cable from the LMV37.4:
If a longer signal cable is required for service work for example (short-time usage,
<24 hours), note that the above application under the burner hood no longer applies
and, for this reason, the signal cable can be subjected to increased mechanical
stress. In that case, use a reinforced signal cable

Both the AGV50 signal cable and the AZL2 must be shipped and stored so that no
damage due to dust and water can occur when the products are used in the plant

To ensure protection against electric shock hazard, make certain that, prior to
switching on power, the AGV50 signal cable is correctly connected to the AZL2

The AZL2 must be used in a dry and clean environment

The mechanical coupling between the actuators and the controlling elements for
fuel and air, or any other controlling elements, must be rigid

Once the LMV37.4 has been installed in the equipment, a check must be carried out
to ensure compliance with the EMC emission requirements!

When grounded PELV signals are connected to the SELV terminals of the burner
control, they also become PELV voltages (according to EN 60730-1, chapter 11.2.7,
EN 298 chapter 9.2.d)

An isolating transformer grounded on one side must be used if the wiring takes
place with a mains circuit without a grounded conductor or the mains supply
between the phases (in accordance with EN 298-1, chapter 9.2.d)

To prevent high-energy couplings due to magnetic induction or capacitive coupling,
the cable lengths must be >10 m on the detector cables and communication lines
with a shielded cable, grounded on both sides (based on requirements from EN
13611)

Testing torque of the screws RAST5 connector: 0.5 Nm

Testing torque of the screws RAST3.5 connector: 0.25 Nm
Basic documentation LMV37.4...
1 Safety notes
CC1P7546en
17.12.2018