Cleaning Heat Exchanger Flue Side, 155 - Weil-McLain ECO 70 Manual

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AS FIRED WATER BOILER
Cleaning heat exchanger flue side, 155
Cleaning the ECO 155 heat exchanger
FLUE SIDE or accessing the burner,
when 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. Metric wrench or socket, 10 mm.
2. Phillips head screwdriver, #2.
3. Socket with 8" extension,
4. Torque wrench.
5. Putty knife.
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 jacket door.
4. Lift the jacket door up and away from the boiler to remove.
1. See Figure 107, page 105 part A.
2. Disconnect the ground wire and ignition cable from the
igniter (item 7).
3. Remove the two Phillips-head screws securing the igniter to
the heat exchanger cover plate (item 6).
4. Carefully slide the igniter out of its mounting slot.
5. Remove and inspect the igniter gasket. Replace with a new
gasket if necessary.
6. Inspect the igniter ceramic and electrodes. Clean the elec-
trodes carefully with steel wool. If the igniter ceramic is
cracked or damaged, replace the igniter with a new one.
1. See Figure 107, page 105 part A to locate components refer-
enced in the following.
2. Remove the air silencer and disconnect gas line:
a. See Figure 107, page 105 part A and part B.
b. Locate the air silencer clip, item 8. Pull on the right side of
the clip until it rotates forward as shown in part A inset.
c. Slide the air silencer (item 1) down and off of the venturi
(item 5). Set the air silencer aside.
d. Disconnect the flexible gas line where it connects just
below the gas valve (item 3). Lay the free end of the
flexible gas line to the side.
Use two wrenches when disconnecting the flexible
gas line to prevent damage to the gas valve and other
gas line components.
e. Disconnect the two wire harnesses connected to the
blower and the wire harness connected to the gas valve.
3. It is RECOMMENDED to remove the blower/gas valve
venturi assembly (item 2) from the cover plate (item 6) by
Part number 550-142-122/0513
— Boiler Manual
".
5/16
removing the two " locknuts attaching them. This will
5/16
make removing the cover plate significantly easier.
4. Remove the heat exchanger cover plate assembly:
a. See Figure 107, page 105 part A, part C and part D.
b. Use a 10-mm wrench to remove the five (5) M6 nuts (item
9) that secure the heat exchanger cover plate (item 6) to
the heat exchanger.
c. Lift the cover plate assembly vertically until the refractory
(part D, item 16) clears the heat exchanger.
d. Slide the cover plate forward as you tilt the front down-
ward until the rear lip clears the cabinet. Avoid gouging
the refractory on the heat exchanger studs.
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.
e. Carefully place the cover plate assembly aside.
Handle the cover plate assembly carefully to avoid
damage to the components or refractory. Place the
assembly on a clean, flat surface.
1. See Figure 107, page 105 part A, part B and part C.
2. Use a Phillips screwdriver to remove the three (3) M4
screws and flat washers (item 10) that secure the burner
access cover (item 4) to the heat exchanger cover plate
(item 6).
3. Remove the burner cover plate (item 4) and the burner
(item 11).
4. Remove the burner gasket (item 12) from the heat
exchanger cover plate if still in place. This gasket is ceramic
fiber and may pull apart or stick to the burner on removal.
Do not let fragments drop into the heat exchanger if the
gasket pulls apart during removal. Replace the gasket with
a new one during reassembly.
5. Inspect the burner cover plate seal (item 13). Discard and
use a new seal during re-assembly if the seal is damaged in
any way.
6. Inspect the interior of the burner. Brush and vacuum the
interior if needed to remove lint or sediment. Alternative
swirl the burner thoroughly in a bucket of mild liquid
laundry detergent water, then rinse thoroughly.
7. Inspect the burner exterior. It must be in good condition,
with no visible damage.
8. Clean the underside of the burner flange (see item 15) with
a soft brush to remove any gasket fragments remaining.
1. See Figure 107, page 105 part D.
a. Inspect the refractory (item 16) to make sure it is
intact, with no visible damage.
b. If the refractory must be replaced, use a wide-blade
putty knife 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.
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