Weil-McLain GOLD CGa Installation And Maintenance Manual page 22

GOLD
3e
Boiler-bypass piping
method
Temperature gauges
Valve adjustment
22
CGa Gas-Fired Water Boiler
Water piping —
This piping method is called a
around the boiler (through valve
in order to raise the average water temperature in the boiler enough to prevent flue gas
condensation. Boiler-bypass piping is effective for some boilers — including the CGa —
provided the flow rates are adjusted according to the instructions following.
and are alternative piping suggestions for
Figures 15 16
or steam systems) or
radiant heating system
be applied. (
Figure 17
piping. however, is not suitable for radiant heating applications because it does not
Figure 17
protect the radiant system from possible high water temperature.)
Boiler-bypass piping keeps system flow rate as high as possible and temperature drop as low as
possible, helping to equalize the building heat distribution.
Gauge is optional if the bypass valves will be adjusted using cold (or room temperature)
4a
return water to the boiler. (When setting the valves without gauge
room temperature water — assume the return water temperature to be 60 °F. Set the valves so
gauge reads at least 120 °F.
8
Gauge is optional on converted gravity systems, but
4b
to display the water temperature being supplied to the radiant tubing.
Gauge is on all systems to assure reliable adjustment of the bypass valves. The
8 required
boiler-mounted temperature/pressure gauge can be used if a separate temperature gauge is
not installed.
1. Start with valve
7a
2. Gradually open valve
higher than gauge
4a
enough flow rate and high enough average temperature to prevent condensation even with
low system return water temperature.
3. Valve regulates the system flow rate, while valve
7a
4. The boiler-mounted temperature/pressure gauge may be used in place of a separate gauge
Failure to
prevent low return water temperature
boiler sections or burners, resulting in severe personal injury, death or substantial property
damage.
Radiant heating system piping should include a means of
and the
temperature
).
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,
control provide controls and piping
at
temperature no less than 130 °F
Weil-McLain representative for suggested piping and control methods.
Failure to
prevent cold return water temperature
to the sections or burners, resulting in possible severe personal injury, death or substantial
property damage.
low temp systems
because part of the circulator flow is bypassed
boiler-bypass
). This method reduces the flow rate throughout the boiler,
7a
— for use when primary/secondary piping can't
is another alternative, using system bypass in place of boiler-bypass
fully closed and fully open.
7b
while closing valve until the temperature at gauge
7a 7b
. A minimum 60 °F temperature rise through the boiler assures a low
system supply temperature
system supply temperature is relatively constant
which can
regardless of system supply temperature. Contact your
to the boiler could cause corrosion damage
(large water content
converted gravity
installed — using cold or
4a
on radiant heating systems —
required
regulates the boiler flow rate.
7b
to the boiler could cause corrosion of the
regulating the boiler return water
(such as provided by an
.
outdoor reset
regulate the boiler return water
Part Number 550-110-593/1099
reads 60 °F
8
8.
injection