Weil-McLain WM97+100 Manual page 118

WM97+ Series 2
Cleaning heat exchanger flue side, 70
protected from damage. If the refractory is damaged, it
must be discarded and replaced with a new one.
b. Remove the three (3) #20 Torx screws (item 14) securing
the burner (item 10) to the cover plate. Set aside.
c. Remove the burner and its gasket (item 13).
d. Inspect the interior of the burner. Brush and vacuum the
interior if needed to remove lint or sediment. Alternative
laundry detergent water, then rinse thoroughly.
e. Inspect the burner exterior. It must be in good condition,
with no visible damage.
f. Inspect the burner gasket. If the gasket is damaged, obtain
a new gasket before re-installing the burner.
Inspect and clean the heat exchanger
1. Access the heat exchanger interior by following the previous
instructions.
2. See Figure 123, page 117 part E.
3. Use a strong light to visually inspect the interior of the heat
exchanger. Make sure the flueways (tubes) are clear and
unobstructed.
a. If soot or debris is present, obtain a fresh water hose
with sprayer.
4. Use a vacuum cleaner to remove any accumulation on the
heating surfaces. This includes removing any pieces of refrac-
tory that may have dropped into the exchanger.
DO NOT use any solvent when cleaning the ex-
changer.
5. If the vacuum cleaner is unable to clean completely, wash
the heating surfaces with clean, warm water.
a. Place a bucket under the boiler condensate drain con-
nection.
b. Loosen and move the condensate bracket, then loosen the
condensate trap upper nut and slide the trap off of the
drain connection. (See Figure 74, page 65 for reference.)
c. Spray water into the heat exchanger and tubes to remove
sediment. Collect water in the bucket below.
6. Inspect the heat exchanger cover plate refractory. Replace if
insulation is damaged.
Reinstall components
1. See Figure 123, page 117 for reference.
2. Reinstall the burner (item 10) and burner gasket (item 13) on
the cover plate (item 6). Tighten the burner screws (item 14)
using a torque wrench. The screws must be secure, but the
torque must not exceed 20 inch-pounds.
3. Apply a ring of silicone adhesive on the cover plate (to secure
the refractory).
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GAS FIRED WATER BOILER
4. Slide the refractory (item 12) over the burner. Align the
5.
6. Reinstall the igniter assembly (item 7).
7. Reinstall the venturi/cover plate assembly (items 5 and 6)
8. Reconnect the igniter wire and the igniter ground wire.
9. Reinstall the blower.
10. Reinstall the air inlet silencer (item 1) by pressing onto the
11. Slide the gas valve (item 3) outlet collar into the venturi
12. Slide the gas valve retainer clip (item 4) into position to
13. Reinstall the condensate trap and bracket on the boiler
— Boiler Manual
refractory and press in place.
handling the assembly, allow the adhesive to set
Before
enough that the refractory is firmly held in place.
a. The igniter gasket must be intact and in good condition.
Replace with a new gasket if necessary.
b. Insert the igniter into the cover plate opening, with the
gasket in position.
c. Reinstall the two (2) Allen socket head bolts finger tight.
d. Use a torque wrench to tighten the igniter bolts. DO NOT
exceed 20 inch-pounds torque.
and secure the cover plate with 10-mm hex nuts (item 9).
You must gradually tighten the cover plate nuts
using a torque wrench. The final torque MUST
NOT exceed 45 inch-pounds. Alternate tightening
until all nuts reach 45 inch-pounds.
a. Reconnect the two (2) blower wiring harnesses.
b. Slide the blower up onto the venturi sleeve.
c. Reinstall the blower retainer clip, item 15.
air inlet adapter. Rotate into the normal vertical position (see
part A) of Figure 123, page 117.
(item 5) opening. Make sure the gas valve-to-venturi O-ring
(item 5, Figure 10, page 16) is in place and in good condition.
Inspect the gas valve flex line, making sure there are no signs
of wear or damage. Replace if necessary.
secure the gas valve.
condensate drain connection. (See Figure 74, page 65 for
reference.)
Perform a complete start-up procedure when put-
ting the boiler back into service. See page 90 and all
instructions for start-up and verification. Include a
soap suds leak test on all interior and exterior gas
piping after starting the boiler.
(continued)
Part number 550-142-204/0117