Unigas R91, Installation Manual

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Ionisation current: > 1 µA
Output signal:
Potential-free contacts (1 normally closed, 1 normally open)
Contact load: max. 2 A
Connection terminals: 2 x 1.5 mm2
Flame detection: Lamp in the device
Ambient temperature: 20 °C to +60 °C
Fitting position: Arbitrary
Weight: 370 g
Construction: Housing made of impact-resistant plastic.
Plug-in upper housing with amplifying stage and green lamp for flame
detection.
Plug socket with terminals, earthing strip and neutral bar 5 openings for
Pg 9 cable gland provided.
Project planning information
Multi-flame control:
No more than 5 flame detectors should be used per
flame control unit since it must be guaranteed that all burners are ignited
within the flame control unit’s safety period (3 s, 5 s or 10 s).
Very long gas pipes may possibly lead to delayed ignition of a burner and
to switchoff of the entire system. This is why the pilot gas valves should
be installed directly on the burners. In the case of ionisation control, one
of the burners can be monitored by the flame control unit.
In the case of UV control, one IFW 15 flame detector must be used per
burner. A diode of type EM 513 must be fitted as shown on the wiring dia-
gram (Fig. 4).
Load of the flame control unit per output: 1A, total current: 2 A.
Decoupling relays must be provided if the currents exceed these values.
Ionisation line: Max. 50 m; condition: well away from mains cable and
sources of radiated noise - no electrical interference.
Several ionisation lines may be laid together in one plastic conduit. Avoid
metal conduits wherever possible. Use high-voltage cables, non-scree-
ned.
Fig. 1
Fig. 2