MG & SG Series Boilers – Installation and Service Manual
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2.10 BOILER PIPING SYSTEM
The boiler piping system of a hot water boiler connected to heating coils located in air handling units
where they may be exposed to refrigerated air circulation must be equipped with flow control valves or
other automatic means to prevent gravity circulation of the boiler water during the cooling cycle.
The boiler, when used in connection with a refrigeration system, must be installed so the chilled medium
is piped in parallel with the boiler with appropriate valves to prevent the chilled medium from entering the
boiler.
2.11 CORROSION PREVENTION (INTERNAL)
We strongly recommended the use of oxygen barrier tubing to protect the system and its components
from corrosion. 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
components. Corrosion is a preventable condition and is not covered by the Super Hot product warranty.
Should your system include "non-oxygen-barrier-tubing" please contact the factory or your heating
professional for recommendations.
2.12 SYSTEM OPERATING REQUIREMENTS
WARNING
If you do not follow these instructions exactly, a fire or explosion may result causing property
damage, personal injury or loss of life.
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 heat exchanger. Do not draw water from the heating system for
cleaning, flushing, etc.
Super Hot MG and SG series boilers are designed for use in closed loop systems and are not intended
for open systems, as in heating pool water or systems where water is constantly replenished. Operating
the boiler in an open system will result in premature failure of the heat exchanger. Super Hot boilers
may be used to heat water in open systems indirectly by installing a heat exchanger, such as the Super
Hot C-Coil, to separate open and closed systems.
Heating systems with low temperature return water may cause flue gas moisture to condense on the
boiler heat transfer surfaces, causing corrosion and restricting flue gas flow. Also, low temperature return
water may overcool the flue gases, resulting in reduced vent suction. These are natural phenomena and
are independent of the boiler design. As a guide to avoiding such corrosion and draft problems, it is
imperative that the return water be not less than 135°F (57°C).
MG AND SG SERIES BOILERS MUST ALWAYS BE USED WITH FORCED SYSTEM CIRCULATION.
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