Advertisement
Mounting notes
Upgrading existing plant
Start repetition in the
event of loss of flame
Installation notes
Electrical connection of ionization probe and flame detector
Siemens Building Technologies
HVAC Products
•
Ensure that the relevant national safety regulations are complied with
When changing plants to LOK16... or LGK16..., the existing LAL... or LFL... base must
be secured by a cylinder-shaped grooved pin, thus ensuring that only an LOK16... or
LGK16... type burner control can be fitted.
Part number of grooved pin: 4 166 8024 0
Location of grooved pin:
Between terminals 10 and 11 of the LAL... base, and between terminals 4 and 5 of the
LFL... base.
By removing link «B» on the underside of the unit, the LOK16... can be switched to start
repetition in the event of loss of flame during operation.
In that case, the wire link must be cut off completely.
But it must be checked whether this is in compliance with national standards and regu-
lations.
•
Always run the high-voltage ignition cables separately while observing the greatest
possible distance to the unit and to other cables
•
Neutral conductors may not be interchanged
It is important to achieve practically disturbance- and loss-free signal transmission:
•
Never run the detector cable together with other cables
– Line capacitance reduces the magnitude of the flame signal
– Use a separate cable
•
Observe the permissible detector cable lengths (refer to «Technical data»)
•
It is not permitted to connect 2 flame detectors QRA53... / QRA55... in parallel
•
When using the QRA53... / QRA55..., earthing of terminal 22 is mandatory
•
The ionization probe is not protected against electric shock hazard
•
Locate the ignition electrode and ionization probe such that the ignition spark can-
not arc over to the ionization probe (risk of electrical overloads)
•
Supervision with ionization probe and flame detector QRA... is possible but, for
safety reasons, both may not be active at the same time, with the exception of the
second safety time «t9». At the end of the second safety time, one of the detected
flames must extinguish, e.g. by shutting down the pilot gas valve connected to ter-
minal 17
3/20
CC1N7785en
15.10.2003
Advertisement
