Burnham MST288, MST396, MST629, MST513 Section X Boiler Cleaning, Clean the Flueways See Figure

Section X: BOILER Cleaning

WARNING

All boiler cleaning must be completed with burner service switch turned off. Boilers equipped with burner swing door have a potential hazard which can cause severe property damage, personal injury or loss of life if ignored. Before opening swing door, turn off service switch to boiler to prevent accidental firing of burner outside the combustion chamber. Disconnect the burner plug from the receptacle in the front jacket. Be sure to tighten swing door fastener completely when service is completed.

A.CLEAN THE FLUEWAYS (See Figure 27).

1.For access to the combustion chamber remove the two (2) 3/8" - 16 cap screws. If boiler is equipped with flexible fuel line(s), swing door open.

2.Remove the two smoke box clean-out covers from the rear smoke box by removing the four 5/16"-18 hex head bolts. It is NOT necessary to remove the vent connector from the smoke box to clean boiler.

If necessary, remove the vent connector if there is evidence of heavy soot accumulation in the boiler or to inspect base of chimney for condensate or accumulation of debris.

3.Remove the baffles (if installed) from the flue passages. There is a pair of baffles in each boiler. The baffles are installed in the 2nd pass (two inner flue ways) on the MST396, MST513 and MST629.

4.Clean the 3rd Pass – Insert a 2" dia. x 42" long wire or fiber bristle brush into each of the two 3rd passes. Using long strokes push the brush all the way through the boiler until the brush has exited the smoke box opening. Pull the brush all the way forward until it has exited the front of the boiler.

Continue this operation for the entire height of the flue way until clean. Repeat the operation for the other 3rd pass flue way.

5.Clean the 2nd Pass - Insert a 2" dia. x 42" long wire or fiber bristle brush into each of the two 2nd passes. Using long strokes push the brush all the way through the boiler until the brush hits the back wall of the reversing chamber. Pull the brush all the way forward until it has exited the front of the boiler.

Continue this operation for the entire height of the flue way until clean. Repeat the operation for the other 2nd pass flue way.

6.Vacuum the loose debris in the bottom of the combustion chamber and smoke box.

B.Clean the Combustion Chamber

– Use a wire or fiber bristle brush to clean the surfaces of the combustion chamber. Vacuum all of the loose debris in the bottom of the combustion chamber.

C.AFTER CLEANING, vacuum all remaining debris as necessary. Inspect burner swing door insulation, and rope gasket for signs of damage. If damaged, replace as needed.

D.REASSEMBLE BOILER.

CAUTION

Do not start the burner unless the burner swing door and canopy cover plates are secured in place.

1Insert the baffles (if originally installed) into the correct flue way. The baffles are installed in the 2nd pass (two inner flue ways) on the MST396, MST513 and MST629.

2.Attach the smoke box clean-out covers onto the rear of the boiler. Verify that the rope gasket is in good working order before assembly. Replace rope gasket if necessary. Use the 3/8" hardware originally removed. Do not over tighten. They should be snug but not bottomed out.

NOTICE

When securing burner swing door make sure door is drawn-in equally on both sides.

Tighten swing door hardware to provide adequate seal to rope gasket around perimeter of door.

Use an alternating tightening method from right side to left side cap screw to pull door tight equally.

NOTICE

Do not overtighten. The rope gasket will provide sufficient seal when the door is snugged into place.

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