Check Burner Flame; Check Flame Signal - Weil-McLain Ultra Manual

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gas fired water boiler
Annual startup

Check burner flame

The boiler contains ceramic fiber materials. Use care
when handling these materials per instructions on
page 79 of this manual. Failure to comply could
result in severe personal injury.
1. Inspect flame through observation window using the proce-
dure on page 74.
2. If flame is unsatisfactory at either high fire or low fire, turn
off boiler and allow boiler to cool down. Then remove burner
and clean it thoroughly using a vacuum cleaner or compressed
air. Do not use compressed air to clean burner if performed
inside a building.
3. To access the burner, remove the heat exchanger cover plate
following the procedure beginning on page 89.
4. When replacing burner, ensure gasket is in good condition
and correctly positioned. After tightening the three retainer
screws, bend up the retainer tabs as shown in Figure 93 to
prevent screw rotation.
5. Reattach the cover plate using the method given in
ure 97, page 90 or Figure 99, page 91.
6. After servicing, reinstall boiler components. Retest boiler.
Figure 93
Burner assembly
82
— Boiler Manual
(continued)
Fig-

Check flame signal

1. Navigate to Diagnostics/Inputs on the U-Control display (see
Figure 85, page 64). The flame signal value must be at least
20 above the Shutdown values given in Figure 92, page 82.
Figure 92
Flame signal shutdown values
Model Shutdown
Ultra – flame signal
80 95
80 HA 95
105 135
105 HA 135
155 80
2. If the flame signal drops to less than 20 above the Shutdown
values, the U-Control will attempt to correct by increasing
the boiler firing rate to increase flame signal.
3. A lower flame signal may indicate a fouled ignitor or dam-
aged ignitor insulation. If cleaning the ignitor does not
improve, ground wiring is in good condition, and ground
continuity is satisfactory, replace the ignitor.
Model Shutdown
Ultra – flame signal
155 HA 80
230 100
230 HA 100
310 130
310 HA
130
Part number 550-100-066/0608