Weil-McLain Gold CGi Series 2 User Manual page 24

GOLD
4d
Water piping —
Primary/secondary
(preferred) bypass
piping method
Temperature
gauges
Valve adjustment
(Figure 20 and 21 only)
24
CGi Series 2 Gas-Fired Water Boiler
low temp systems
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.
show suggested bypass arrangements using
Figures 20 and 21
piping (preferred) for low temperature systems such as
. For alternatives, see pages 26 through 29.
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 is on all systems to assure the return water temperature is accurately set for
8 required
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 fully closed and
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
the 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
water 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,
reset control
at
water temperature
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.
and ) provide mixing of hot boiler outlet water with cooler
7a 7b
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 is relatively constant
provide controls and piping
regardless of system supply temperature. Contact
no less than 130 °F
primary/secondary
or
radiant heating systems
on radiant heating systems
required
until the temperature at gauge
to the boiler could cause corrosion of
regulating the boiler return
(such as provided by an
.
which can
regulate the boiler return
to the boiler could cause corrosion
Part Number 550-110-710/0200
bypass
converted
reads
8
injection
outdoor