Weil-McLain Evergreen 220 User Manual page 111

™ GAS
Cleaning heat exchanger flue side
5. If the vacuum cleaner is unable to clean completely, wash the
heating surfaces with clean, warm water,using the following
procedure.
a. Place a shallow pan under the boiler condensate drain
connection.
b. Loosen the condensate trap clamp (item 22) and slide
the drain line off of the drain connection. (See Fig-
ure 106, page 113 for reference.)
c. Spray water into the heat exchanger and tubes to remove
sediment. Collect water in pan below.
d. If additional cleaning is necessary, use a pressure washer
(using caution) to obtain better scrubbing action.
Do not attempt to use hard objects to clean out the
exchanger or tubes. The heat exchanger surfaces
could be damaged.
Reinstall heat exchanger cover plate
and refractory
1. See Figure 104 for reference.
2. Obtain the new refractory from the Maintenance Kit.
3. Carefully place the refractory into the top of the heat ex-
changer as shown.
4. Align the notch in the refractory with the front heat exchanger
cover plate stud (just right of center in the front).
DO NOT press down on the refractory. Too much
force could cause the refractory to crack or be dam-
aged.
5. Use the silicone adhesive to lay a bead of silicone in a weaving
pattern as shown.
a. Maintain at least 1 inch clearance from edges of refractory
and from openings in refractory.
b. Do not apply an excessive amount of adhesive. This
could cause spreading or prevent good contact with the
cover plate.
6. See Figure 106, page 113 for reference.
7. Re-install the heat exchanger cover plate using the following
procedure.
a. Place the heat exchanger cover plate gasket, item 17, (in
Maintenance Kit) onto the heat exchanger studs.
b. Carefully place the heat exchanger cover plate over the
heat exchanger cover plate studs.
c. Gently lower the cover plate until it rests on the cover
plate gasket.
d. Reach into the cover plate burner opening and gently pull
the refractory up against the cover plate to compress the
adhesive for a good seal/adhesion.
e. Use a 10 mm wrench or socket to secure the nuts
(item 9) on studs of the heat exchanger cover plate
(item 6) to the heat exchanger. [Six (6) nuts (EVG 220)
or seven (7) nuts (EVG 299/300/399).]
f. Tighten the cover plate nuts gradually, adjusting a little
at a time. Alternate and repeat until all are tightened
evenly.
g. Do not over-tighten (torques no more than 45 inch-
pounds).
Part number 550-100-131/0715
-
FIRED WATER BOILER
— Boiler Manual
Placing refractory into heat exchanger and
applying silicone adhesive – EVG 220 shown
(continued)
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