Weil-McLain Evergreen EVG 220 Manual page 114

®
gas
Cleaning heat exchanger flue side
Reinstall components
1. See Figure 109, page 115 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 (item 11), and burner access cover seal
(item 13) on the heat exchanger cover plate (item 6).
a. Insert and tighten the burner access cover screws (item 10)
using a T20 Torx. Tighten screws gradually, adjusting a little
at a time, using a criss-cross pattern and repeating until all are
tightened evenly. The screws must be secure, with
b. Use a torque wrench to tighten screws to a torque of 23 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 screws to a torque of 20 inch-
pounds.
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. Use a torque wrench to tighten screws to a torque of 20 inch-
pounds.
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. Use a torque wrench to tighten locknuts to a torque of 20 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 109, page 115 part E for reference.)
11. Reinstall the burner access panel and air baffle (see
Figure 106, page 111). Tighten screws securely.
Perform a complete start-up procedure when putting the
boiler back into service. See page 92 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 91.
– 114 –
-
fired water boiler
— 220/299/300/399 Boiler Manual
Figure 108
A
Boiler interior assembled view,
B
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.
C
Blower, burner, and venturi, showing combustion
chamber cover plate insulation assembly (item 16)
D
Heat exchanger interior
E
Boiler lower interior, showing condensate dish
(item 19) and condensate drain line (item 22)
1
Inlet air silencer
2
Blower assembly
3
Gas valve
4
Burner access cover
5
Venturi assembly
6
Heat exchanger cover plate
7
Igniter assembly
8
Flame sense rod
9
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
11 Burner
12 Burner gasket
13 Burner access cover seal
14 Burner gasket sealing surface
15 Burner sealing surface (lower surface of burner
flange)
16 Combustion chamber refractory (adhered to
combustion chamber cover plate with silicone
adhesive)
17 Heat exchanger cover plate gasket
18 Sight glass assembly
19 Heat exchanger outer shell
20 Condensate dish
21 Condensate dish joint
22 Condensate drain line clamp
23 Condensate drain line
(continued)
Legend for Figure 109, page 115
Part number 550-100-131/0120