Weil-McLain Evergreen 220 User Manual page 112

™
GAS
Cleaning heat exchanger flue side
Reinstall components
1. See Figure 106, page 113 for reference.
2. Obtain the new burner gasket (item 12) from the Maintenance Kit
and install into the heat exchanger cover plate.
3. Reinstall the burner gasket (item 12), burner (item 11), and
burner access cover seal (item 13) on the heat exchanger cover
plate (item 6).
a. Insert and tighten the burner cover plate screws and washers
(item 9) using a Phillips screwdriver. The screws must be secure,
with torque no more than 20 inch-pounds.
4. Reinstall the igniter assembly (item 7).
a. Insert the igniter into the cover plate opening, with the new
gasket in position.
b. Reinstall the two (2) Allen head screws finger tight.
c. Use a torque wrench to tighten the igniter screws. DO NOT
exceed 25 inch-pounds torque.
d. Reconnect the ignition cable and the igniter ground wire.
5. Reinstall the flame sense rod (item 8).
a. Carefully insert the flame sense rod into the cover plate open-
ing, with the new gasket in position.
b. Reinstall the two (2) screws, tighten securely.
c. Re-attach the wire harness to the flame sense rod.
6. Reconnect the flexible gas line to the gas valve using two wrenches.
7. Reinstall the blower/venturi/gas valve assembly:
a. Install the two (2) 8 mm locknuts connecting the blower to
the cover plate.
b. Do Not over tighten(torque no more than 23 inch-pounds).
8. Reinstall the air inlet silencer (item 1) by pressing onto the ven-
turi (item 5). Reinstall the air inlet silencer by gently pushing the
silencer onto the venturi. If needed, gently pull apart the clips to
clear venturi.
9. Reconnect the wire harnesses to the blower and gas valve.
10. Reinstall the condensate trap on the boiler condensate drain con-
nection. (See Figure 106, page 113 part E for reference.)
11. Reinstall the burner access panel and air baffle (see
Figure 103, page 109). Tighten screws securely.
Perform a complete start-up procedure when putting the
boiler back into service. See page 90 and all instructions
for start-up and verification. Include a soap suds leak
test on all interior and exterior gas piping after starting
the boiler.
After placing the boiler in operation, the ignition system
safety shutoff device must be tested, page 89.
– 112 –
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FIRED WATER BOILER
— Boiler Manual
Legend for Figure 106, page 113
Boiler interior assembled view,
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.
Blower, burner, and venturi, showing combustion
chamber cover plate insulation assembly (item 16)
Heat exchanger interior
Boiler lower interior, showing condensate dish
(item 19) and condensate drain line (item 22)
Inlet air silencer
Blower assembly
Gas valve
Burner access cover
Venturi assembly
Heat exchanger cover plate
Igniter assembly
Flame sense rod
Heat exchanger cover plate retainer nuts (6) - EVG
220, and (7) - EVG 299/300/399.
10 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)
Combustion chamber refractory (adhered to
combustion chamber cover plate with silicone
adhesive)
Heat exchanger cover plate gasket
Sight glass assembly
Heat exchanger outer shell
Condensate dish
Condensate dish joint
Condensate drain line clamp
Condensate drain line
(continued)
Part number 550-100-131/0715