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VIII. Service
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A.
General. Inspection and service should be conducted
annually. Turn off electrical power and gas supply
while conducting service or maintenance. Follow
instructions TO TURN OFF GAS TO APPLIANCE. See
Figure 15 for Intermittent Ignition (EI) or Figure 16 for
Continuous Ignition (standing pilot).
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B.
Low Water Cutoff (if so equipped). Follow instructions
provided with low water cutoff.
C.
Inspect Vent System. See Figure 21.
1. Remove obstructions in vent pipe and chimney.
2. Remove soot accumulations with wire brush and
vacuum.
3. Repair or replace deteriorated vent pipe and vent
accessories.
4. Provide proper support. Repair sags, particularly in
horizontal sections.
5. Repair leaking joints.
D.
Inspect Boiler Flue Passages for blockage or soot
accumulation. See Figure 21.
1. Remove vent pipe, vent damper, blocked vent switch
and draft hood.
2. Remove sheet metal screws securing Jacket Top Panel.
Lift panel and rotate about safety relief valve piping
until top of boiler is exposed. If piping or wall prevent
full rotation of top panel for access to canopy, cut slot
into safety relief valve opening and remove top panel.
3. Remove carriage bolts securing Canopy to Section
Assembly. For high efficiency models (CG--Ah)
remove flue baffles.
4. Using flashlight, examine all flue passageways.
a. If passageways are free of soot and obstruction,
replace canopy, secure and seal.
b. If passageways need cleaning, remove burners as
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5. Install flue baffles (if used).
6. Install new gasket material (See Section IX: Repair
Parts). Install canopy. Secure with carriage bolts.
7. Install Jacket Top Panel, Draft Hood, Blocked Vent
Switch, Vent Damper, and vent pipe.
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E.
Clean Main Burners and Firebox.
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1. To remove burners for cleaning, changing orifices, or
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repairs:
a. Remove Jacket Front Panel.
b. Disconnect pilot tubing at gas valve.
c. For Continuous Ignition (Standing Pilot),
d. Disconnect Flame Rollout Switch wires.
e. Remove Burner Access Panel.
f. Mark Pilot Main Burner location on Manifold.
g. Hold burner on throat. Lift slightly to clear orifice.
2. Brush top of burners with a soft bristle brush. See
Figure 21. Vacuum burners.
Table 6: Pilot Burner Location
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described in Paragraph E below. Using long
handle wire or bristle flue brush and vacuum,
brush flueways thoroughly from top of boiler as
illustrated in Figure 21. Replace canopy and seal.
disconnect thermocouple at gas valve. For
Intermittent Ignition (EI), disconnect igniter
cable, sensor cable and ground wire at Ignition
Module.
Pull burner from combustion chamber. Pilot Main
Burner can only be removed by lifting at 45°
angle after adjacent burner to right is removed.
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