Flame Signal Measurement; Inadequate Flame Signal - Riello RL 190/M Installation, Use And Maintenance Instructions

5.5.4

Flame signal measurement

Flame signal can be measured at the Flame Signal Test Jacks, see
Fig. 40, and at the Keyboard Display Module.
Equipment Damage Hazard.
Improper wiring can destroy ultraviolet sensing tube
WARNING
Negative (-)
meter lead
Flame simulator
test jack
S8157
5.5.5

Inadequate flame signal

If a satisfactory flame signal cannot be obtained while adjusting the
sighting position of the detector, perform the procedures indicated
in steps 1 through 7.
Bother difficulties are encountered in the system, refer to Trouble-
shooting in the Instructionsfor the appropriate Honeywell Flame
Safeguard Control.
➤ Check for proper line voltage. Make sure the master switch is
closed, connections are correct, and power supply is the cor-
rect voltage and frequency.
➤ Check the detector wiring for defects, including:
– incorrect connections.
– wiring type or size of wire.
– deteriorated wire.
– open circuits.
– short circuits.
– leakage paths caused by moisture, soot, or dirt.
➤ With the burner running, check the temperature at the detec-
tor. When it exceeds 215' F [ 102' C]:
– use a heat block if using a Flame Detector.
– add the additional insulation between the wall of the com-
bustion chamber and the detector.
– add a shield or screen to reflect radiated heat away from the
detector, or
– add cooling (refer to Sight Pipe Ventilation.
➤ Remove the detector and clean the viewing window with a
soft, clean cloth.
➤ Clean the inside of the sight pipe (if one is used) before rein-
stalling the detector.
➤ If the flame signal continues to be too low, replace the plug-in
20051197
Start-up, calibration and operation of the burner
Positive (+) meter lead
One megohm/voltmeter
Fig. 40
28
amplifier (if the control has one).
➤ If you still cannot obtain a proper flame signal, replace flame
detector or UV radiation sensing tube.
GB