Connections
25
Initial System Fill
Treatment for boiler feed water should
be considered in areas of known
problems, such as high mineral content
and hardness. In areas where freezing
might occur, an antifreeze may be
addedtothesystemwatertoprotect
thesystem.Pleaseadheretothe
specifications given by the antifreeze
manufacturer. Do not use silicate based
automotive anti-freeze s olutions.
Please observe that an antifreeze/water
mixture may require a backflow
preventer within the automatic water
feed and influence components such as
diaphragm expansion tanks, radiation
etc. A 40% antifreeze content will give
freeze-up protection to -25°C (-13°F).
Do not use antifreeze other than
specific brands made f or hot water
heating s y stems. System also may
contain components which might be
negatively affected by antifreeze.
Check total system frequently when
filled with antifreeze.
A field supplied pressure reducing valve
(or “fill” valve) is required to reduce the
incoming water pressure to 12-15 psig
(see Figs. 5 and 6 on pages 16 and 17).
Pressure Relief Valve
The 30 psig ASME-rated pressure relief
valve supplied with the boiler must be
installed. Do not install valve between
pressure relief valve and boiler. When
installing a discharge pipe from pressure
relief valve to drain, adhere to the
following excerpt from ASME Boiler and
Pressure Vessel Code, Section IV. Use
fittings supplied in access ory pack to
install pressure relief valve.
1. When a discharge pipe is used, its
internal cross-sectional area shall be
not less than the full area of the
valveoutletorofthetotalofthe
valve outlets disc harging there into
and shall be as short and straight as
possible and so arranged as to avoid
undue stress on the valve or valves.
When an elbow is placed on a safety
relief valve discharge pipe, it shall be
located close to the valve outlet.
2. The discharge from safety or s afety
relief valves shall be so arranged that
there will be no danger of scalding
attendants. When t he safety or
safety relief valve discharge is piped
away from the boiler t o the point of
discharge, there shall be provisions
made for properly draining the piping.
The size and arrangement of
discharge piping shall be such that
any pressure that may exist or
develop will not reduce the relieving
capacity of the relieving devices
below that required to protect the
boiler.
5167 450 v1.4
The press ure relief valve must not
cap, plug or otherwise obstruct
discharge pipe outlet. Do not pipe
discharge to outdoors.
CAUTION
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