Weil-McLain Evergreen EVG 220 Manual page 14

®
gas
Gas conversions
LEGEND for Figures 11, 12, 13 and 14
1
Air Silencer
2
Air silencer clips (2)
3
Venturi
4
Blower
4. Locate the blower and venturi (see Figure 11).
5. Gently pull on both silencer retaining clips (Figure 11, item
2) and remove air silencer from front of venturi (item 3).
Figure 11
Air silencer removal
1
6
Label wires before removing
Label all wires prior to disconnection when ser-
vicing controls. Wiring errors can cause improper
and dangerous operation.
6. Disconnect wire harness from gas valve.
7. Loosen swivel nut (Figure 11, item 7) on venturi-gas valve
connection (item 6). See Figure 12. Gently set gas valve a side.
Figure 12
Gas pipe loosened for propane conversion
3
8
5
– 14 –
-
fired water boiler
(continued)
5
Gas valve
6
Gas pipe
7
Swivel nut
8
Fiber Washer
3
2
7
4
7
— 220/299/300/399 Boiler Manual
Use two wrenches
boiler, using one wrench to prevent the boiler gas
line connection from turning. Failure to support
the boiler gas connection pipe to prevent it from
turning could damage gas line components.
Figure 13
Removal of Natural gas venturi
8. Remove three (3) T20 Torx screws holding the venturi,
(Item 3) in place. Remove venturi, o-ring, and inspect
blower surface. Discard old o-ring and fiber washer, see
Figure 13.
9. Install new propane venturi and o-ring from conversion kit.
10. Ensure o-ring is seated properly in groove on blower.
11. Insert three (3) new Torx screws from conversion kit to hold
venturi in place. Torque screws to no more than 23 inch-
pounds.
12. Reassemble gas pipe with new fiber washer from conversion
kit to the venturi connection, using two wrenches to tighten
swivel nut. Replace silencer gasket and re-attach air silencer
to venturi. See Figure 14, page 14.
Figure 14
Installing the new propane gas venturi
5
when tightening gas piping at
3
3
Part number 550-100-131/0120
4