Service & Maintenance - Crown Boiler FWZ Series Installation Instructions Manual

All boiler cleaning must be completed with the 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 the
swing door fastener completely when service is completed.
The following procedure should be performed on an annual basis:
1) Turn off electrical power and oil supply to the boiler.
2) Clean the boiler as follows:
a) Remove the two 3/8" bolts from either side of the swing door and open the door to access the combustion chamber.
b) Remove the two smoke box clean-out covers from the rear smoke box by removing the four 5/16" bolts. It is
not necessary to remove the vent connector from the smoke box to clean boiler however if there is heavy soot
accumulation in the boiler remove the vent connector to inspect the base of the chimney for condensate or
accumulation of debris.
c) Remove the baffles (if installed) from the flue passages.
d) Clean the 3rd Pass - Insert a 2" dia x 42" long wire or fiber bristle brush into one of the two 3rd flue 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.
e) Clean the 2nd Pass - Insert a 2" dia x 42" long wire or fiber bristle brush into one of the two 2nd flue 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.
f) Vacuum to loose debris in the bottom of the combustion chamber and smoke box
g) Clean the Combustion Chamber - Use a wire or fiber bristle brush to clean the surfaces of the combustion chamber.
Vacuum all loose debris in the chamber.
h) Check condition of the burner swing door insulation and rope gaskets for signs of damage; replace if required.
i) Check burner head for signs of deterioration. Clean the head of any deposits.
j) Insert baffles (if originally installed) into the correct flueways.
k) Attach the smoke box clean-out covers onto the rear of the boiler using the 5/16" bolts originally removed. Verify
that the rope gasket is in good order before assembly. Replace rope gasket if necessary. Do not over tighten. The
bolts should be snug but not bottomed out.
l) Close the swing door and tighten it with the 3/8" bolts originally removed. When securing the burner swing door
make sure the door is drawn-in equally on both sides by alternating the tightening method for right side to left side.
Do not over tighten. The rope gasket will provide sufficient seal when door is snugged into place.
m) Ensure all vent piping joints are gas tight and secured with sheet metal screws.
Clean the boiler even if there are no significant soot deposits. Failure to remove all sulfur and
ash deposits annually can cause severe corrosion damage.
XIII Service and Maintenance
WARNING
IMPORTANT
41