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Building Technologies
CC1N7719en
17.07.2018
Installation notes
Locate the detector such that, if possible, only the flickering peripheral range of the
flame will be detected. The view at hot boiler walls or other hot boiler or burner
components must be restricted as much as possible. This can be attained by clearly
confined viewing conditions behind narrow baffle plates. If this is not possible, a viewing
tube should be used to restrict the viewing range to a smaller area of the flame. Length,
diameter and alignment of the viewing tube must be determined through testing,
depending on the size of burner and boiler
The viewing range should be reduced to such an extent that:
a) the minimum detector output signal required is attained over the burner’s entire
output range (for details, refer to the Basic Documentation of the LMV5... (P7550)
b) after loss of flame, the valve’s operating voltage is switched off by the burner
control as required by the standards (see
Commissioning notes
).
Electrical connection of the flame detectors
It is important to achieve practically disturbance- and loss-free signal transmission:
·
Never run the detector cable together will other cables
- Line capacitance reduces the magnitude of the flame signal
- Use a separate cable
·
Observe the permissible length of the detector cables (see
Technical data
)
·
Always run the ignition cable separate while observing the greatest possible
distance to other cables (min. 3 cm)
·
Test the flame detector on all applications. When used in connection with the
LMV5..., the test is to be made with a test routine (for details, see the Basic
Documentation P7550)
·
Make certain that the detector’s cable does not get into contact with hot burner or
boiler surfaces
·
Use an AC voltmeter (Ri = 10 M
W
) to ensure that there is no voltage across the
reference line (blue wire =
N
of the LMV5...) and the burner housing (
PE
)
Commissioning notes
·
When commissioning the plant or when doing maintenance work, make the
following safety checks:
Safety check
Anticipated response
a)
Burner startup with flame detector darkened
Lockout at the end of
safety time (TSA)
b)
Burner startup with flame detector exposed to
extraneous light (e.g. light from an incandescent
lamp interrupted at about 20 Hz)
Lockout at the end of
the prepurge time
c)
Simulation of flame failure during operation. For
that purpose, darken the flame detector during
operation and maintain this state
Lockout or restart,
depending on the
burner control’s
configuration
d)
Check the safety time in operation in the event of
loss of flame; for that purpose, disconnect
manually the fuel valves from power and check
the time the burner control requires from this
manual disconnection until the valves’ power
supply is turned off
Burner control
disconnects power
supply to the valves
within the period of time
allowed for the relevant
plant
·
Make a loss-of-flame test with the AZL5... of the LMV5... burner control
