Weil-McLain GOLD CGS 550-110-260/0508 User Manual page 20

GOLD CGs Gas-Fired Water Boiler — Boiler Manual
3d
Piping — low temp systems
BOILER-bypass piping
method
This piping method (
called a
boiler-bypass
fl ow is bypassed around the boiler (through valve
This method reduces the fl ow rate throughout the boiler,
in order to raise the average water temperature in the
boiler enough to prevent fl ue gas condensation. Boiler-
bypass piping is effective for some boilers — including
the CGs — provided the fl ow rates are adjusted accord-
ing to the instructions following.
Figures 10
for
converted gravity
systems) or
primary/secondary piping can't be applied. (
page 23, is another alternative, using system bypass in
place of boiler-bypass piping.
not suitable for radiant heating applications because it
does not protect the radiant system from possible high
water temperature.)
Boiler-bypass piping keeps system fl ow rate as high as
possible and temperature drop as low as possible, help-
ing to equalize the building heat distribution.
Temperature gauges
Gauge
4a
20
and
Figures 10
because part of the circulator
and are alternative piping suggestions
11
(large water content or steam
— for use when
radiant heating system
Figure 12
is optional if the bypass valves will be ad-
Failure to
prevent low return water temperature
the boiler sections or burners, resulting in severe personal injury, death or substantial
property damage.
Radiant heating system piping should include a means of
water temperature
tion pumping control
Boiler return water temperature will be adequately controlled using the methods shown
in this manual provided the
apply the methods of this manual if the system is equipped with an
DO NOT
Instead,
reset control.
turn water temperature
Contact your Weil-McLain representative for suggested piping and control methods.
Failure to
prevent cold return water temperature
damage to the sections or burners, resulting in possible severe personal injury, death or
substantial property damage.
justed using cold (or room temperature) return water
to the boiler. (When setting the valves without gauge
installed — using cold or room temperature water
4a
— assume the return water temperature to be 60°F. Set
, page 21) is
11
the valves so gauge
Gauge
4b
).
7a
but
required
the water temperature being supplied to the radiant
tubing.
Gauge is
8
adjustment of the bypass valves. The boiler-mounted
temperature/pressure gauge can be used if a separate
temperature gauge is not installed.
Valve adjustment
,
Figure 12
1. Start with valve
2. Gradually open valve
however, is
until the temperature at gauge
than gauge
through the boiler assures a low enough fl ow rate
and high enough average temperature to prevent
condensation even with low system return water
temperature.
3. Valve
regulates the boiler fl ow rate.
7b
4. The boiler-mounted temperature/pressure gauge
may be used in place of a separate gauge
and the
system supply temperature
).
system supply temperature
provide controls and piping
at
no less than 130°F
(continued)
reads at least 120°F.
8
is optional on converted gravity systems,
on radiant heating systems — to display
on all systems to assure reliable
required
fully closed and
7a
while closing valve
7a
reads 60 °F higher
8
. A minimum 60°F temperature rise
4a
regulates the system fl ow rate, while valve
7a
to the boiler could cause corrosion of
regulating the boiler return
(such as provided by an
is
relatively constant.
which can
regulate the boiler re-
regardless of system supply temperature.
to the boiler could cause corrosion
Part number 550-110-260/0508
fully open.
7b
7b
.
8
injec-
outdoor