Maintenance
5-8
750-382
CBT
5.6 — UV scanner (full modulation only)
Maintenance of the UV scanner consists of periodic inspection and cleaning. To inspect, unscrew the UV flame
detector from the bracket. Check to ensure that the flame viewing lens is clear and free of dust or debris. Wipe
with a clean rag if necessary.
To function properly, the scanner needs a clear line of sight to the burner canister. Welding slag or other debris,
an out-of-place gasket, or the boiler refractory dry oven can all potentially obstruct the scanner. To verify a line
of sight, unscrew the UV scanner from the mounting bracket and ensure that it is possible to sight through the
bracket to the burner can without obstruction (Figure 5-7).
Figure 5-8 shows the UV scanner wiring connections.
ELECTRODE
BAFFLE PLATE
ORIFICE PLATE
COVER
ORIFICE PLATE
BAFFLE PLATE
FLAME ROD
.16
ELECTRODE
ORIFICE PLATE
BAFFLE PLATE
FLAME ROD
0.25 - 0.125
ELECTRODE
(TIP IS FLUSH WITH
FACE OF BAFFLE PLATE)
FIGURE 5-6. Ignition electrode and flame rod, on/off burners
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