Weil-McLain WM97+70 Specifications download pdf (Page 114)

Part number 550-142-120/0113

WM97+ gas-fired water boiler — Boiler Manual

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Cleaning heat exchanger ﬂue side, 70/110 (continued)

•swirltheburnerthoroughlyinabucketofmildliquid

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 119, page 113 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. Then loosen the condensate trap upper nut and slide the

trap off of the drain connection. (See Figure 71, page 62

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 119, page 113 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).

4. Slide the refractory (item 12) over the burner. Align the re-

fractory and press in place.

Before handling the assembly, allow the adhesive to set

enough that the refractory is ﬁrmly held in place.

6. Reinstall the igniter assembly (item 7).

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 Phillips head screws ﬁnger tight.

d. Use a torque wrench to tighten the igniter screws. DO

NOT exceed 20 inch-pounds torque.

7. Reinstall the venturi/cover plate assembly (items 5 and 6)

and secure the cover plate with 10-mm hex nuts (item 9).

8. Reconnect the igniter wire and the igniter ground wire.

You must gradually tighten the cover plate nuts us-

ing a torque wrench. The ﬁnal torque MUST NOT

exceed 45 inch-pounds. Alternate tightening until

all nuts reach 45 inch-pounds.

9. Reinstall the blower.

a. Reconnect the two blower wiring harnesses.

b. Slide the blower up onto the venturi sleeve.

c. Reinstall the blower retainer clip, item 15.

10. Reinstall the air inlet silencer (item 1) by pressing onto the

air inlet adapter. Rotate into the normal vertical position (see

part A) of Figure 119, page 113.

11. Slide the gas valve (item 3) outlet collar into the venturi

(item 5) opening. Make sure the gas valve-to-venturi O-ring

(item 5, Figure 10, page 15) 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.

12. Slide the gas valve retainer clip (item 4) into position to

secure the gas valve.

13. Reinstall the condensate trap on the boiler condensate drain

connection. (See Figure 71, page 62 for reference.)

Perform a complete start-up procedure when put-

ting the boiler back into service. See page 87 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.

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Weil-McLain WM97+70 Specifications Page 114

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