MG, SG & AAA Series Boilers – User’s Information Manual
8
14 PRESSURE RELIEF VALVE
A pressure relief valve is supplied as standard equipment. The pressure relief valve provides extra
protection against damage that could be caused by malfunctioning controls or excessive water pressure.
If a pressure relief valve is not used, the warranty is void.
The pressure relief valve must be installed by a qualified installer in accordance with local codes and
should not be tampered with in any way. The outlet of the pressure relief valve should be positioned over
a suitable drain. The drain pipe must pitch down from the pressure relief valve and should be no smaller
than the outlet of the pressure relief valve. The end of the drain line should not be concealed or threaded
and should be protected from freezing. No valve of any type should be installed between the pressure
relief valve and unit or in the drain line. Extensive runs, traps or bends reduce the capacity of the
pressure relief valve. The pressure relief valve is a code requirement.
If discharge occurs during normal operation, call a qualified service agency immediately. Discharge
indicates an unsafe pressure condition or a malfunctioning pressure relief valve. Avoid contact with the
hot water or steam discharged to prevent personal injury.
15 BLOCKED VENT AND FLAME ROLL-OUT SAFETY SWITCHES
Applicable to all boilers with an input rating less than 300,000 BTU/HR
•
This boiler is equipped with a "Blocked Vent" shut-off system. The safety switch will shut down the
boiler should the vent or flue become partially or completely blocked. Should this occur do not attempt
to re-light the burner. Contact a qualified service agency to ensure it is safe to re-light the boiler.
•
This boiler is equipped with a "Flame Roll-out" shut-off system. The safety switch will shut down the
boiler should flames roll-out of the combustion chamber. Should this occur do not attempt to re-light
the burner. Contact a qualified service agency to ensure it is safe to re-light the boiler.
16 INSPECTION & MAINTENANCE SCHEDULE
This boiler has been designed to provide years of trouble-free performance in normal installations. The
owner or user should conduct a general external examination covering all items on the "User Checklist" at
the
beginning of each heating season
and in
mid-heating season
to assure continued good
performance.
In addition, have the boiler inspected by qualified service technician or gas supplier’s service person
annually
at the beginning of the heating season for continued safe operation.
Note that some operating conditions may require more frequent inspections.
