Weil-McLain GOLD CGa Manual page 20

GOLD CGa Gas-Fired Water Boiler — Boiler Manual
3d
Piping — low temperature systems
Primary/secondary
Bypass piping method
the flow rate and temperature drop in the heating
circuit(s) is determined only by the heating circuit
circulator(s). So adjustment of the bypass valves in
the boiler circuit will not cause a change in the heating
circuit rate and temperature distribution.
Figures 13
arrangements using
(preferred) for low temperature systems such as
alternatives, see pages 22 through 25.
The bypass valves (items
hot boiler outlet water with cooler system return water
— set to assure a minimum return water temperature
(at least 130°F) to the boiler. Set the valves as explained
below.
Temperature gauges
but
20
(preferred)
bypass piping is preferred because
and , page 21, show suggested bypass
14
or
and ) provide mixing of
is suggested, but optional on any system.
is optional on converted gravity systems,
on radiant heating systems — to display
Failure to
the boiler sections or burners, resulting in severe personal injury, death or substantial
property damage.
Radiant heating system piping should include a means of
in this manual provided the
apply the methods of this manual if the system is equipped with an
DO NOT
Instead,
Failure to
damage to the sections or burners, resulting in possible severe personal injury, death or
substantial property damage.
the water temperature being supplied to the radiant
tubing.
is
water temperature is accurately set for a minimum of
130°F. If this gauge is not available however, adjust the
valves such that the boiler-mounted temperature/pres-
sure gauge reads at least 150°F when the system return
water is cold (approximately 60°F water temperature).
Valve adjustment
bypass piping
(Figures 13 and 14 on ly)
1. Set the valves while the system is cool, setting for the
. For
coldest expected water temperature (usually 60°F
since the system will often drop to room tempera-
ture between cycles).
2. Start with valve
the temperature at gauge reads 130°F when gauge
reads 60°F.
ter from the boiler supply which mixes with return
flowing through the boiler secondary loop.
and the
).
at
on all systems to assure the return
fully closed and
while closing valve
regulates the amount of hot wa-
regulates the amount of system water
to the boiler could cause corrosion of
(such as provided by an
is
which can
regardless of system supply temperature.
to the boiler could cause corrosion
Part Number 550-101-009/0107
fully open.
until