Weil-McLain GOLD CGa Installation And Maintenance Manual page 20

GOLD
3d
Primary/secondary
(preferred) bypass
piping method
Temperature gauges
Valve adjustment
(Figure 13 and 14 only)
20
CGa Gas-Fired Water Boiler
Water piping —
bypass piping is preferred because the flow rate and temperature drop in
Primary/secondary
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.
and show suggested bypass arrangements using
Figures 13 14
piping (preferred) for low temperature systems such as
. For alternatives, see pages 22 through 25.
gravity systems
The bypass valves (items
system return water — set to assure a minimum return water temperature (at least 130 °F) to
the boiler. Set the valves as explained below.
Gauge is suggested, but optional on any system.
4a
Gauge is optional on converted gravity systems, but
4b
to display the water temperature being supplied to the radiant tubing.
Gauge 8 is required on all systems to assure the return 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/pressure gauge reads at least 150 °F when the system return water
is cold (approximately 60 °F water temperature).
1. Set the valves while the system is cool, setting for the coldest expected water temperature
(usually 60 °F since the system will often drop to room temperature between cycles).
2. Start with valve
7a
3. Gradually open valve
130 °F when gauge
4. Note that valve regulates the amount of hot water from the boiler supply which mixes
7a
with return water. Valve
boiler secondary loop.
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
and ) provide mixing of hot boiler outlet water with cooler
7a 7b
fully closed and fully open.
7b
while closing valve
7a 7b
reads 60 °F.
4a
regulates the amount of system water flowing through the
7b
system supply temperature
system supply temperature
which can
regardless of system supply temperature. Contact your
to the boiler could cause corrosion damage
primary/secondary
radiant heating systems
on radiant heating systems —
required
until the temperature at gauge
to the boiler could cause corrosion of the
regulating the boiler return water
(such as provided by an
is
relatively constant.
outdoor reset
regulate the boiler return water
Part Number 550-110-593/1099
bypass
or
converted
reads
8
injection