Service manual

SC Series Boilers – User’s Information Manual
8
10 BOILER WATER
Avoid unnecessary replenishment of system water. It can allow oxygen to enter the system and cause
serious corrosion problems. As well, minerals dissolved in the water supply will precipitate when heated;
minerals preferentially deposit in the system and the heat exchanger. Do not draw water from the heating
system for cleaning, flushing, etc.
Any audible sounds in the boiler system may be indications of scaling or lack of sufficient water flow and
the system should be checked without delay. Scaling is due to improper maintenance. It is not the fault
of the boiler. Scale damage is not covered by warranty.
In cold weather conditions, take precautionary measures to ensure the system will maintain a minimum
return temperature of 138°F. Lower return temperatures will cause condensation on the heat exchanger
or in the venting system and reduce draft suction. In addition, low temperatures in the system may result
in extensive damage due to freezing if the system should shutdown, possibly due to a safety switch
shutdown, for any length of time.
Chemical inhibitors are not recommended as their improper use or maintenance can cause accelerated
corrosion, resulting in premature failure of the boiler heat exchanger and/or system.
11 PRESSURE RELIEF VALVE
A pressure relief valve is supplied as standard equipment. The pressure relief valve is 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 should be installed on the boiler outlet with its spindle vertical. The connection
between the boiler and the relief valve must have at least the area of the valve inlet.
A discharge pipe should be used. The discharge pipe outlet should
be positioned over a suitable drain and so arranged that there will be
no danger of being scalded. The discharge pipe must pitch down
from the valve and should be no smaller than the outlet of the valve.
The end of the discharge pipe should not be concealed or threaded
and should be protected from freezing. Extensive runs, traps or
bends could reduce the capacity of the pressure relief valve.
No valve of any type should be installed between the pressure relief
valve and unit or in the discharge pipe. The pressure relief valve is a
code requirement. Field installation of the relief valve must be
consistent with the ANSI/ASME Boiler and Pressure Vessel Code,
Section IV.
Avoid contact with the hot water discharged to prevent personal
injury.
12 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.