Cleaning Heat Exchanger Flue Side, 70 - Weil-McLain Series 2 Manual

® S
ERIES
Cleaning heat exchanger flue side, 70
Cleaning the ECO 70 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 89 of this manual. Failure to comply could
result in severe personal injury.
Tools required
• Long-handled Torx driver, #20
• Phillips head screwdriver, #2
• Nut driver, "
5/16
• Torque wrench
• Putty knife
• Wrench or socket, 10mm
• 3mm Allen wrench
• (2) Large Cresent wrenches
Before proceeding:
1. Shut down the boiler:
a. Follow "To Turn Off Gas to Appliance" instructions on
boiler and Operating 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 (2) screws at the bottom
of the plastic jacket door.
4. Lift the jacket door up and away from the boiler to remove.
Remove components to allow access
1. See Figure 113, page 106 part A to locate components
referenced in the following.
2. Remove the air baffle (item 28, page 3) by removing the two
(2) hex head screws in front of the air intake adapter (item
16 page 3). Set aside.
3. See Figure 113, page 106 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 16)
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.
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation.
Part number 550-142-190/1218
2
-
G
AS FIRED WATER BOILER
— Boiler Manual
Figure 112
Legend for Figure 113, page 104
A Boiler interior
B Boiler interior, with
components disconnected
to allow removal of
combustion chamber cover
plate
C Combustion chamber cover
plate and components
removed from boiler
D 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
f. Remove the four (4) 10mm hex nuts (item 9) that secure
the heat exchanger cover plate (item 6).
g. Disconnect the ground wire and ignition cable from the
igniter (item 7).
h. Lift the cover plate/burner assembly vertically until the
refractory (part C, item 12) clears the heat exchanger.
i. Tilt the cover plate/burner assembly slightly forward.
Then pull the assembly forward and out of the jacket.
j. Remove the igniter by removing the two (2) Socket head
Allen igniter bolts. 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
refractory. Place the assembly on a clean, flat
surface with the assembly upside down, as shown
in Figure 113, page 106 part C and part D.
4. See Figure 113, page 106 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
refractory is made of ceramic fiber materials. Read
the ceramic fiber WARNING on page 89 before
handling or disposing of ceramic fiber materials.
6 Heat exchanger cover plate
7 Ignitor assembly
8 Gas valve sense line
9 Combustion chamber cover
plate retainer nuts (4)
10 Burner
11 Putty knife
12 Refractory
13 Burner gasket
14 (3) Burner retainer screws
15 Blower retainer clip
16 Control module
105