Unigas R91 VS Series, Manual Of Installation - Use - Maintenance, Page: 35 / 60

PART III: MAINTENANCE
35
Matching the combustion heads and the control boxes
The combustion head is modae of four heads: one is provided with Siemens QRA detection probe connected to the Siemens LFL
control box (Fig. 57-Fig. 59-A); the other three heads are provided with Krom-Schroeder UVS5 probes, connected to the Krom-
Schroeder IFW15 flame detectors (Fig. 57-Fig. 59-B-C-D).
Checking the detection current
To check the detection current follow the diagram on the following pictures. If the signal is less than the quoted value, check the posi-
tion of the detector, the electrical contacts and, if necessary, replace the detector.
Fig. 11
Fig. 12
Fig. 13
Fig. 14
Minimum detection current: DC 6

(Flame intensity on AZL display: 50%)
Minimum detection current: DC 85

(Flame intensity on AZL display: 100%)
Fig. 15
Fig. 16
B
A
D
C
A
D
C
B
LMV5x IFW15
B C
D
27A
MC TERMINAL
BOARD
µA DC
Control box Minimum detection signal
Krom Schroeder IFW15 1µA
27B / 27C / 27D MC TERMINAL
BOARD
µA DC