Ultra Boiler Manual
Part number 550-100-440/0122
112
(continued)
Figure 120 Burner assembly
e boiler contains ceramic ber materials.
Use care when handling these materials per
instructions on page109 of this manual. Fail-
ure to comply could result in severe personal
injury.
1. Inspect ame through observation window using the
procedure on page40.
2. If ame is unsatisfactory at either high re or low re,
turn o boiler and allow boiler to cool down. en re-
move 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 page125.
4. When replacing burner, ensure gasket is in good condi-
tion and correctly positioned. Aer tightening the three
retainer screws, bend up the retainer tabs as shown in
Figure120 to prevent screw rotation.
5. Reattach the cover plate using the method given in
Figure126,page126 or Figure128,page127.
6. Aer servicing, reinstall boiler components. Retest
boiler.
1. Navigate to Diagnostics/Inputs on the U-Control display (see
Figure115,page102). e ame signal value must be at least 20
above the Shutdown values given in Figure119.
Figure 119
Flame signal shutdown values
Model
Ultra –
Shutdown
Model
Ultra –
Shutdown
80 95 230 100
80 HA 95 230 HA 100
105 135 299 130
105 HA 135 299 HA 130
155 80 399 120
155 HA 80 399 HA 120
NOTE: “HA” means high altitude, 5500 feet or more above seal level.
2. If the ame signal drops to less than 20 above the Shutdown
values, the U-Control will attempt to correct by increasing the
boiler ring rate to increase ame signal.
3. A lower ame signal may indicate a fouled ignitor or damaged
ignitor insulation. If cleaning the ignitor does not improve, ground
wiring is in good condition, and ground continuity is satisfactory,
replace the ignitor.