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111241-01 - 3/21
1. Instructions to safely light and shut down this boiler is shown on page 5, as well as on a label affixed to the
boiler. When the boiler is working properly, this boiler will light and shut down automatically in response to the
building thermostats(s). If it does not, the boiler must be inspected by a qualified installer, service agency or
gas supplier.
2. All boilers are equipped with a means of preventing the boiler from firing if there is an excessive blockage in the
vent system. Boilers designed for chimney venting are equipped with a blocked vent switch located as shown in
Figure 1 or 2, depending on the specific boiler design. If this switch opens, the boiler will not fire. Call a qualified
installer, service agency or gas supplier to diagnose and the problem and reset this switch if necessary.
3. All boilers are equipped with a flame rollout switch located as shown in Figure 3 or 4, depending on specific
boiler design. This switch will shut the burners down in the event that flames exit the burner compartment
through the front opening. If this happens, the flame rollout switch must be replaced. If the boiler fails to fire, call
a qualified installer, service agency or gas supplier to diagnose and correct the problem.
Basic Operation
WARNING
• 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, or the combustion air supply. The blocked vent switch should
only be reset after a qualified installer, service agency or gas supplier has diagnosed and corrected the
venting/combustion air problem that caused the blocked vent switch to open.
•
In the event that the flame rollout switch opens, the cause of the flame rollout must be diagnosed and
corrected by a qualified gas service technician before the boiler is restarted.
• A “tripped” flame rollout switch must be replaced by an identical switch having the same
temperature setting.
• Should overheating occur or the gas supply fail to shut off, do not turn off or disconnect the electrical
supply to the pump. Instead, shut off the gas supply at a location external to the appliance.
• Do not use this boiler if any part has been under water. Immediately call a qualified installer, service
agency or gas supplier to inspect the boiler and to replace any part of the control system and any gas
control which has been under water.
• This boiler is equipped with safety devices, which could cause it to shutdown, requiring service to
restore normal operation. Where such a shutdown could result in damage from low temperatures (such
as frozen pipes), do not leave the heating system unattended during cold weather unless alarms or
other safeguards are in place to prevent damage.
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