LFL1.333 - Gas burner control, t1=31s, TSA=3s, t9=3s, AC230V
It is important to achieve practically disturbance- and loss-free signal transmission:
ï‚· Never run the detector cable together with other cables
– Line capacitance reduces the magnitude of the flame signal
– Use a separate cable
 Observe the maximum permissible detector cable lengths (refer to «Technical data»)
ï‚· 2 UV detectors QRA2 / QRA4 / QRA10 can be connected in parallel (observe the
warning note)
ï‚· In connection with the QRA2 / QRA4 / QRA10, earthing of terminal 22 is mandatory
ï‚· The ionization probe is not protected against electric shock hazard
ï‚· Locate the ignition electrode and the ionization probe so that the ignition spark
cannot arc over to the ionization probe (risk of electrical overloads) and that the
ignition sparks cannot adversely affect the supervision of ionization
ï‚· Supervision with both ionization probe and UV detector QRA2 / QRA4 / QRA10 is
possible, but for safety reasons – with the exception of the second safety time «t9»
– only 1 flame detector may be active at a time. At the end of the second safety
time, 1 of the detectors must be inactive, however, that is, the detected flame must
have extinguished, e.g. by switching off the ignition valve via terminal 17