8
Pipes that are connected to boiler fittings must be supported and placed so that they do not create stresses on
the boiler fittings themselves.
BY PASS PIPING IS REQUIRED ON ALL LOW MASS BOILERS WHERE THE BOILER
RETURN WATER TEMPERATURE COULD OPERATE BELOW 130ºF FOR EXTENDED
PERIODS OF TIME.
The Solaia boiler is a highly efficient low mass boiler in which care must be taken to ensure that high
volumes of low temperature water are not introduced into the boiler. Operating at return water temperatures
below 130ºF for extended periods of time will allow for the accumulation of condensation, scale and
increased soot formation in the boiler. Corrosion and eventual heat exchanger failure will result. A
thermostatic bypass valve is highly recommended on high water volume standing cast iron systems.
A thermostatic bypass valve will consistently ensure that return temperatures to the boiler exceed 130
o
F at
all times. See Figure 1 for Thermostatic Bypass valve piping.
Instead of using a thermostatic bypass, bypass piping may be accomplished by placing a 3/4” bypass line
with a throttling valve for regulation between the supply piping and return piping. Boiler return water
temperatures must exceed 130ºF with the bypass properly adjusted.
Low water cut off
Hot water boilers installed above radiation level must be provided with a low water cut off device at time of
the boiler installation.
Relief Valves
Relief valves are to be properly piped in to conform to code standards. Discharge piping from the relief
valve must be piped to a drain or must terminate 6” above the floor to eliminate damage to the structure or
personal injury. It must not be piped to a point where freezing may occur.
Expansion Tanks
The expansion tank must be properly sized to the system requirements. An undersized expansion tank will
cause system water to be lost through the relief valve and make up water to be introduced through the fill
valve. Continual introduction of fresh water will cause boiler failure.
VENTING
Failure to follow all instructions can result in flue gas spillage and carbon monoxide
emissions, causing severe personal injury or death. All chimneys must meet the requirements of
NFPA 211 and NFPA 31 or NFPA 54
Chimney
The boiler must be connected to an adequate chimney or an approved venting system in accordance with
these instructions. An adequate chimney or venting system is one that is sealed and lined with the capability
of producing a -.04" W.C. flue draft and having the capacity to handle the amount of flue gas that is
introduced.
Masonry and metal chimneys shall be constructed in accordance with applicable building code
requirements. Masonry chimneys shall be lined with an approved clay tile liner or a listed chimney lining
system installed in accordance with manufacturers’ instructions and also meeting the requirements of
NFPA-211 Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances. Metal chimneys
also shall meet the requirements of NFPA-211. Factory built chimneys shall be listed and shall be installed
in accordance with their listing and NFPA-211.
WARNING
(2 pages)
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