Crown Gas-Fired Hot Water Sealed Combustion Boiler CSC-175

- The following routine maintenance should be performed on an annual basis:

1) Turn off power to the boiler

2) Remove the burner tray from the boiler. To do this:

b) Remove the four allen screws holding the elbow flange onto the gas valve.

c) Remove the three 8-32 screws holding the manifold gasket plate to the intake box

d) Remove the four ¼-20 nuts holding the burner assembly in the boiler

e) Disconnect the ignition wire from the electrode.

Carefully remove the burner assembly being careful not to damage the firedoor insulation or the manifold gasket.

Disconnect the vent system from the boiler by removing the four 10-32 screws holding the vent collar in place

Remove the top jacket panel. If possible, remove the rear and left side jacket panels

Unplug the fan and remove the fan cover plate

Disconnect the pressure switch hoses

Remove the two ¼-20 nuts and washers holding the flue collector onto the heat exchanger.

Score the silicone seal around the flue collector with a utility knife or similar tool

Pry the flue collector off of the heat exchanger, being careful not to damage the flue collector or fan.

Warning: This procedure requires trained personnel with PPE!

CO and CO2 within acceptable limits?

Report any causes of excessive CO or CO2

Warning: Do not leave the boiler in service with the intake cover removed

Boiler operational with intake cover removed?

Measure pressure at flue collector