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Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 1 Safety notes 01.12.2009
1 Safety notes
1.1 Warning notes
To avoid injury to persons, damage to property or the environment, the following
warning notes must be observed!
LMV37.4... are safety devices! Do not open, interfere with or modify the units. Sie-
mens does not assume responsibility for damage resulting from unauthorized in-
terference!
The chapters covering the LMV37.4... contain additional warning notes which
should also be observed when using the different unit versions!
After commissioning and after each service visit, check the flue gas values
across the entire output range!
The present Basic Documentation describes a wide choice of applications and functions
and shall serve as a guideline. The correct functioning of the units is to be checked and
proven by function checks on a test rig or on the plant itself!
• All activities (mounting, installation and service work, etc.) must be performed by
qualified staff
• Degree of protection IP40 as per DIN EN 60 529 for the basic unit must be ensured
through adequate mounting by the burner or boiler manufacturer
• Before making any wiring changes in the connection area, completely isolate the
plant from mains supply (all-polar disconnection). Ensure that the plant cannot be
inadvertently switched on again and that it is indeed dead. If not disconnected, there
is a risk of electric shock hazard
• Protection against electric shock hazard on the LMV37.4... and on all connected
electrical components must be ensured through adequate mounting. In terms of de-
sign, stability and protection, the cover must conform to EN 60730
• After each activity (mounting, installation and service work, etc.), check to ensure
that wiring is in an orderly state and that the parameters are correctly set
• Fall or shock can adversely affect the safety functions. Such units must not be put
into operation even if they do not exhibit any damage
• When programming the air-fuel ratio control curves, the commissioning engineer is
obliged to constantly watch the quality of the combustion process (e.g. by means of
a flue gas analyzer) and, in the event of poor combustion values or dangerous con-
ditions, take appropriate actions, e.g. by shutting down the system manually
• The following plug-on terminations carry FELV (Functional Extra Low Voltage) (also
refer to section Electrical connection of the LMV37.4...) which means that they do not
provide safe separation from mains voltage:
- The BCI (X56) for the connecting cable of the AZL2... or the PC tool ACS410
- COM (X92) for accessories, such as the OCI410...
These plug-on terminations may be removed or replaced only when the plant is dead
(all-polar disconnection)
• The connectors of the connecting cables for the LMV37.4... or other accessories,
such as the OCI410... (plugged into the BCI), may only be removed or exchanged
when the plant is shut down (all-polar disconnection), since the BCI interface does
not provide safe separation from mains voltage
• The connections for the SQM3… or SQN1... actuators do not provide safe separa-
tion from mains voltage. Prior to connecting or changing one of these actuators, the
plant must be shut down (all-polar disconnection)
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