Install Instructions
Part number 550-100-131/0715
– 96 –
™
GAS-FIRED WATER BOILER — Boiler Manual
Annual startup (continued)
&IGURE Accessing burner, ignition electrode, flame
sense rod and inspection glass assembly
(EVG 220 shown)
,%'%.$&IGURE0!243!AND"
! Boiler interior assembled view (Model EVG 220 shown;
component locations vary with other models)
" Boiler interior exploded view, showing heat exchanger
cover plate (item 6) blower, burner assembly, burner access
cover seal (item 13), ignitor, flame sense rod, and sight
glass.
Inlet air silencer
Blower assembly
Gas valve
Burner access cover
Venturi assembly
Heat exchanger cover plate
Ignition electrode assembly
Flame sense rod
Heat exchanger cover plate retainer nuts (6) M6 hex
Burner cover retainer screws, M4 Phillips with captive
washers
Burner
Burner gasket
Burner access cover seal
Burner gasket sealing surface
Burner sealing surface (lower surface of burner flange)
If visual inspection of the heat exchanger indicates
the need, follow the procedures in “Cleaning the
heat exchanger FLUE SIDE or accessing the burner,
when required” on page 109 to remove the heat
exchanger cover plate and fully inspect and clean
the interior. Obtain replacement parts for any
components that may be damaged or that show
signs of leakage.
Replace all components
1. Reinstall the burner.
a. Insert a new burner gasket (item 12) into the heat ex-
changer cover plate (item 4).
b. Insert the burner into position.
c. Insert the burner access cover seal into the heat exchanger
cover plate.
d. Place the burner access cover (item 4) into position and
secure the four screws (item 10).
2. Reinstall ignition electrode assembly and gasket, making
sure that it is correctly positioned. Tighten the two (2)
screws securely.
a. Re-attach igniter cable and ground wire to the ignition
electrode assembly.
3. Reinstall flame sense rod assembly and gasket, making sure
that it is correctly positioned. Tighten the two (2) screws
securely.
a. Re-attach the wire to the flame sense rod.
4. Reinstall the burner access panel and air baffle (see
Figure 89, page 94). Tighten screws securely.