Maintenance - Crown Boiler AWR User's Information Manual

Figure 1: Flame Rollout Switch
A shutdown of the burners due to the blocked vent switch is an indication that there is a problem with the vent system,
such as a blockage. The blocked vent switch should only be reset after a qualified gas service technician has diagnosed
and corrected the venting problem that caused the blocked vent switch to open.
3) All boilers except the CWD and BWC boilers are equipped with a flame rollout switch (Figure 1). This
switch will shut the burners down in the event that flames exit the burner compartment through the front
opening. The CWD and BWC use an electronic means built into the ignition system to extinguish the
burner/s in the event that flames exit the combustion chamber. If the boiler fails to fire, call a qualified
heating service agency to diagnose and correct the problem.
4) The AWR, CWI and BSI boilers are equipped with a blocked vent shut-off switch (Figure 2). This switch
will shut the boiler down in the event that there is an excessive blockage in the vent system. This switch
has a reset button, which must be pressed before the boiler can be restarted.
5) BWF, CWD, BWC Series boilers – These boilers are equipped with a safety feature which will shut
down the burners in the event that there is a blockage in the vent system. In the event that the boiler fails
to function, and the boiler is vented through an outside wall accessible from the ground, inspect the vent
terminal on the outside wall for a blockage such as a bee's nest or ice. If a blockage is found, the burners
should ignite approximately 30 seconds after the blockage is removed. If no blockage is found, or if the
terminal is inaccessible from the ground, the problem must be diagnosed and corrected by a qualified gas
service technician.
1) Safe reliable operation of this boiler depends upon proper periodic maintenance.
2) The following should be done on a continuous basis:
• Keep the area around the boiler free of objects, which are flammable or which could obstruct the
flow of air into and around the boiler.
Figure 2: Blocked Vent Switch
WARNING

Maintenance

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