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Building Technologies Division User Manual LMS14... CC1U7471en
3 Mounting and installation 28.01.2015
3.2 Boiler management unit LMS14…
When mounting the PCB on a metal plate, the clearance between the lower edge
of the PCB and the metal plate must be a minimum of 12 mm (as per DIN EN
60335 minimum 8 mm air and creepage path to the end of the wires or the
solder fillets).
- Spacers must be made of electrically non-conductive material!
- When using metal screws for fixing, the head diameter must be 7.5 mm!
- If 2 metal screws are screwed into a spacer from both sides, an air path of 8 mm
must be observed or solid insulation of 2 mm must be provided (as per
DIN EN 60335)!
Caution!
Mounting (general information)
Currently valid national safety regulations must be complied with!
Inside the boiler, the unit must be fitted in a housing ensuring degree of
protection IP40 as a minimum requirement
Depending on the location and environmental conditions, higher degrees of
protection may be required
When mounted, the maximum permissible ambient temperature must never be
exceeded
Condensation water must not drip on the LMS14… or enter the unit, neither in
operation nor when service work is carried out
Ignition equipment
Note!
In terms of switching performance, any type of external ignition module used must be
approved by Siemens!
Electric ignition sparks generate high-frequency energy which can adversely affects
radio and television reception. The high-voltage cable running to the ignition electrode
acts as a transmit antenna. For this reason, application-specific tests must be made to
confirm that adequate distances are observed. High-frequency energy is also of
capacitive and inductive nature, that is, not wire-bound. This must be taken into
consideration when laying the cables.
The ignition cable used must satisfy the technical requirements of the ignition
module and should be run to the ignition electrode as directly as possible, with
no loops in between.
It must never be laid parallel or very close to other electrical cables.
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