Weil-McLain GOLD CGt Manual page 24

GOLD CGt Gas-Fired Water Boiler — Boiler Manual
4d
Piping — low temperature systems
Bypass piping
Figures 20 and 21
rangements using bypass piping for low temperature
systems such as
gravity systems
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 in
and 7b ) provide mixing of hot boiler outlet water with
cooler system return water — set to assure a minimum
return water temperature (at least 130°F) to the boiler.
Set the valves as explained below.
Temperature gauges
• Gauge
tem.
• Gauge
but required
play the water temperature being supplied to the
radiant tubing.
4
, page 5, show suggested bypass ar-
radiant heating systems
.
Figures 20 and
4a is suggested, but optional on any sys-
4b is optional on converted gravity systems,
on radiant heating systems — to dis-
prevent low return water temperature
Failure to
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
DO NOT
apply the methods of this manual if the system is equipped with an
reset control. Instead,
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.
• Gauge
return water temperature is accurately set for a mini-
mum of 130°F. If this gauge is not available however,
adjust the valves such that the boiler-mounted tem-
or converted
perature/pressure gauge reads at least 150°F when
the system return water is cold (approximately 60°F
water temperature).
Valve adjustment
(Figures 20 and 21 only)
1. Set the valves while the system is cool, setting for the
21 (items 7a
coldest expected water temperature (usually 60°F
since the system will often drop to room tempera-
ture between cycles).
. Start with valve
3. Gradually open valve
the temperature at gauge
4a reads 60°F.
4. Note that valve
from the boiler supply which mixes with return wa-
ter. Valve
flowing through the boiler secondary loop.
system supply temperature
and the
).
system supply temperature
provide controls and piping
no less than 130°F
at
8 is required on all systems to assure the
7a fully closed and
7a while closing valve
8
reads 130°F when gauge
7a regulates the amount of hot water
7b regulates the amount of system water
to the boiler could cause corrosion of
regulating the boiler return
(such as provided by an
relatively constant.
is
which can regulate the boiler re-
regardless of system supply temperature.
to the boiler could cause corrosion
Part Number 550-110-290/0107
7b fully open.
7b until
injec-
outdoor