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Smart Infrastructure
Basic Documentation LME7...
CC1P7105enr
1 Safety notes
24.07.2020
1.5 Commissioning
notes
Prior to commissioning the system, the following points must be checked:
The correct assignment of the fuel valves to the fuel valve outputs on the LME7
Correct setting of the time parameters, especially the safety and prepurge times
Correct functioning of the flame detector in the event of loss of flame during
operation (including the response time), with extraneous light, during the prepurge
time and, when there is no establishment of flame, at the end of the ignition safety
time
During
commissioning,
check
all safety functions
There is no absolute protection against incorrect use of the RASTx connectors.
For this reason, prior to commissioning the plant, check the correct assignment of
all connectors
Electromagnetic emissions must be checked on an application-specific basis
For display of the flame on the AZL2, following general conditions apply:
- Display is subject to various component tolerances so that deviations of
10% can occur
- Note that for physical reasons there is no linear relationship between flame
display and detector signal values
The functions of the following available or required input state signals must be checked:
Air
pressure
Minimum gas pressure and maximum gas pressure or POC
Safety loop (e.g. safety limit thermostat)
Duties of the expert when making the approval tests
Action
Check / response
a)
Burner startup with flame detector disconnected
Non-alterable lockout at the end of the first safety time
b)
Burner startup with flame detector exposed to
extraneous light, e.g. to incandescent light with
detectors for visible radiation, quartz-halogen bulb
or cigarette lighter flame with detectors for UV
radiation
Non-alterable lockout during the prepurge time
c)
Simulation of loss of flame during operation. For
that, disconnect the flame detector in the operating
position and maintain that state
Non-volatile lockout or restart depending on the
configuration of the LME7
d)
Check the plant response time with loss of flame
during operation, which involves manually
disconnecting the fuel valves from the power and
checking the time from this moment to the time
required by the LME7 to turn off power to the fuel
valve
Turning off power to the fuel valves by the LME7 within
the period of time permitted for the respective plant
Further checks may be required, depending on the field of use and the relevant
standards.
After installation and commissioning of a plant, the parameterized values and settings
must be
documented
by the person / heating engineer responsible for the plant. This
data can be printed out with the help of the ACS410, for example, or else must be
written down. This document must be kept in a safe place and checked by an expert.
Warning!
On the OEM access level of the LME7, it is possible to make parameter settings
that differ from application standards. When setting the parameters, it must be
made certain that the application will run safely in accordance with legal
requirements. If not observed, there is a risk that safety functions will be
impaired.
