44
ซ.บรมราชชนนี
70
ถ.บรมราชชนนี ศาลาธรรมสพน์ ทวีวัฒนา กทม.
10170.
โทร:
02-888-3472
Line ID: @add11 Wechat ID: add0883001122
Function
Basic mode of operation of the flame safeguards in conjunction with control
unit LEC1.
When used with the LEC1, the flame safeguard feeds the flame signal into the burner
control
’s control program in essentially the same way as if the flame safeguard were a
component of the burner control (as in the case of an oil or gas burner control). In the
event of non-ignition, loss of flame during burner operation, or a faulty flame signal
during burner off or purging times, the burner will always be shut down and the burner
control will initiate lockout. The switching functions needed to feed the flame signal into
the burner control
’s control circuit are provided by the flame relay (FR) of the flame
safeguard and the 2 auxiliary relays (HR1 / HR2) of the control unit LEC1; refer to Data
Sheet N7761.
In conjunction with the flame safeguard LFS1, the control unit LEC1 provides the sequence
control for the flame simulation test and the flame detector test on the LFS1.
The test is controlled via the connecting line between terminal 15 of the control
unit LEC1 and terminal 6 of the flame safeguard LFS1.
Both tests
∂ start about 7 seconds after a controlled shutdown
∂ are continued during burner off periods
∂ are continued during the ensuing prepurge time
∂ end 3 seconds before the start of the safety time
The following flame signals during this test time lead to lockout with interlocking of
the control unit LEC1:
-
Extraneous light
-
Aging flame detectors
-
Other defects in the flame supervision equipment
In the flame safeguard, the switching functions required for testing are performed by
the auxiliary relay (HR).
Since it is not necessary to carry out a test in the case of flame supervision with an
ionization probe, the connecting line between terminal 15 of the burner control and
terminal 6 of the flame safeguard is not required here. Instead, terminal 6 must be
connected to the phase.
Example:
By making a connection to terminal 1 of the LEC1
Any flame signal
– be it a normal flame signal during operation or a faulty signal – is
indicated by the signal lamp (3-colored LED) in the housing of the flame safeguard;
refer to
Indication and diagnostics
chapter.
27/40
Building Technologies CC1N7782en 18.04.2018