Weil-McLain GOLD CGt Manual page 24

GOLD CGt Gas-Fired Water Boiler — Boiler Manual
4d
Water piping — low temp systems bypass
Bypass piping
Temperature
gauges
Valve adjustment
(Figure 20 and 21 only)
24
show suggested bypass arrangements using bypass piping for low
Figures 20 and 21
temperature systems such as
Primary/secondary bypass piping is required because the boiler circulator must install on the
return line and be used to provide domestic water priority. Adjustment of the bypass valves
in the boiler circuit will not cause a change in the heating circuit flow rate or temperature
distribution.
The bypass valves (items
7a
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
7a
130 °F when gauge reads 60 °F.
4a
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 system supply temperature
).
control
Boiler return water temperature will be adequately controlled using the methods shown in
this manual provided the
system supply temperature is relatively constant
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.
or
radiant heating systems converted gravity systems
and ) provide mixing of hot boiler outlet water with cooler
7b
required
fully open.
7b
while closing valve until the temperature at gauge
7b
regulates the amount of system water flowing through the
7b
to the boiler could cause corrosion of the
(such as provided by an
which can
regardless of system supply temperature. Contact your
to the boiler could cause corrosion damage
.
on radiant heating systems
8
regulating the boiler return water
injection pumping
.
outdoor reset
regulate the boiler return water
Part Number 550-110-290/0501
reads