Cleaning Heat Exchanger Flue Side, 70/110 - Weil-McLain ECO 70 Manual

TM -
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AS FIRED WATER BOILER
Cleaning heat exchanger flue side, 70/110
Cleaning the ECO 70 or 110 heat
exchanger FLUE SIDE or accessing
the burner, if required
The boiler contains ceramic fiber materials. Use
care when handling these materials per instructions
on page 84 of this manual. Failure to comply could
result in severe personal injury.
1. Long-handled Torx driver, #20.
2. Phillips head screwdriver, #2.
3. Nut driver, "
5/16
4. Torque wrench.
5. Putty knife.
6. Wrench or socket, 10 mm.
1. Shut down the boiler:
a. Follow "To Turn Off Gas to Appliance" instructions on
boiler and Lighting instructions.
b. Close the boiler manual gas valve.
2. Allow time for the boiler to cool to room temperature if it
has been firing.
3. Remove jacket door by removing two screws at the bottom
of the plastic jacket door.
4. Lift the jacket door up and away from the boiler to remove.
1. See Figure 105, page 101 part A to locate components refer-
enced in the following.
2. Remove the air baffle (item 28, page 3) by removing the two
hex head screws in front of the air intake adapter (item 16
page 3). Set aside.
3. See Figure 105, page 101 part B.
a. Pull the silencer straight forward until it snaps free of the
blower housing. Set the air silencer aside. Rotate the air
inlet silencer if needed to clear as it is removed.
b. Remove the gas valve retainer clip (item 4) and set aside.
Pull the gas valve slightly to the right until it disengages
from the venturi (item 5).
Support the gas valve. DO NOT allow it to hang
from the gas valve flex line. Make sure the gas
valve-to-venturi O-ring (item 5, Figure 12, page 14)
remains on the gas valve sleeve.
c. Disconnect the blower end of the gas valve sense line
(item 8).
d. Remove the blower retainer clip (item 15). Set aside.
e. Remove the blower by pulling down. Disconnect the two
blower wiring harnesses on the back side of the blower.
f. Remove the four 10-mm hex nuts (item 9)that secure the
heat exchanger cover plate (item 6).
100
— Boiler Manual
Legend for Figure 105
A Boiler interior
B Boiler interior, with
components disconnected to
allow removal of combustion
chamber cover plate
Combustion chamber cover
plate and components removed
from boiler
Disassembling to access the
burner
E Heat exchanger interior
1 Inlet air silencer
2 Blower assembly
3 Gas valve
4 Gas valve retainer clip
5 Venturi assembly
g. Disconnect the ground wire and ignition cable from the
igniter (item 7).
h. Lift the cover plate/venturi/burner assembly vertically
until the refractory (part C, item 12) clears the heat ex-
changer.
i. Tilt the cover plate/venturi/burner assembly slightly
forward. Then pull the assembly forward and out of the
jacket.
j. Remove the igniter by removing the two Phillips head
igniter screws. Set the igniter, its gasket and screws aside.
Be careful when handling the igniter not to damage the
igniter ceramic.
k. Inspect the igniter ceramic and electrodes. Clean the
electrodes carefully with steel wool. If the igniter ceramic
is cracked or damaged, replace the igniter with a new one.
Handle the cover plate/venturi/burner assembly
carefully to avoid damage to the igniter or refrac-
tory. Place the assembly on a clean, flat surface
with the assembly upside down, as shown in Fig-
ure 105, page 101 part C and part D.
4. See Figure 105, page 101 part C.
a. Use a wide-blade putty knife (item 11) to gently pry
the refractory from the heat exchanger cover plate. The
refractory is attached with silicone adhesive and should
separate with a little pressure on the putty knife.
DO NOT gouge or crack the refractory. The re-
fractory is made of ceramic fiber materials. Read
the ceramic fiber WARNING on page 84 before
handling or disposing of ceramic fiber materials.
6 Heat exchanger cover plate
7 Ignitor assembly
8 Gas valve sense line
9 (4) Combustion chamber cover
plate retainer nuts
10 Burner
11 Putty knife
12 Refractory
13 Burner gasket
14 (3) Burner retainer screws
15 Blower retainer clip
16 Control module
Part number 550-142-122/0513