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S
4
®
ERIES
Annual startup
Check burner fl ame
The boiler contains ceramic fi ber materials.
Use care when handling these materials per
instructions on page 109 of this manual. Fail-
ure to comply could result in severe personal
injury.
1. Inspect fl ame through observation window using the
procedure on page 40 .
2. If fl ame is unsatisfactory at either high fi re or low fi re,
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 125 .
4. When replacing burner, ensure gasket is in good condi-
tion and correctly positioned. After tightening the three
retainer screws, bend up the retainer tabs as shown in
Figure 120 to prevent screw rotation.
5. Reattach the cover plate using the method given in
Figure 126, page 126 or Figure 128, page 127 .
6. After servicing, reinstall boiler components. Retest
boiler.
Burner assembly
112
-
GAS
FIRED WATER BOILER
(continued)
— Boiler Manual
Check fl ame signal
1. Navigate to Diagnostics/Inputs on the U-Control display (see
Figure 115, page 102 ). The fl ame signal value must be at least 20
above the Shutdown values given in Figure 119 .
Flame signal shutdown values
80
80
80
NOTE: "HA" means high altitude, 5500 feet or more above seal level.
2. If the fl ame signal drops to less than 20 above the Shutdown
values, the U-Control will attempt to correct by increasing the
boiler fi ring rate to increase fl ame signal.
3. A lower fl ame signal may indicate a fouled ignitor or damaged ig-
nitor insulation. If cleaning the ignitor does not improve, ground
wiring is in good condition, and ground continuity is satisfactory,
replace the ignitor.
Part number 550-100-400/0717
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