System-Bypass Piping - Weil-McLain Gold CGa Installation And Maintenance Instructions Manual

GOLD CGa Gas-Fired Water Boiler — Boiler Manual
3d
Piping — low temperature systems
SYSTEM-bypass piping
method
This piping method (
tem-bypass
the system (through valve
from the boiler outlet mixes with cooler system return
water temperature in order to provide minimum 130°F
return water to the boiler. Valve
full open, but may need to be slightly closed on some
low pressure drop systems in order to cause enough
flow through valve
Figure 17
return water temperature control for boilers installed
converted gravity systems
on
or steam systems).
DO NOT apply the piping of
heating systems
ing the water temperature provided to the system and
could result in excessive water temperature in the radi-
ant tubing.
System-bypass piping as shown in
with either zone valve or circulator zoning. When used
with circulator zoning however, the boiler circulator
3
(item ), must be piped as shown. It cannot be used as
one of the zoning circulators.
4
Figure 17
, page 5) is called a
because part of the circulator flow bypasses
7a ). This bypassed hot water
7b will most often be
7a
.
is an alternative piping method that provides
(large water content
Figure 17
. It provides no method of regulat-
Figure 17
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.
prevent cold return water temperature
Failure to
damage to the sections or burners, resulting in possible severe personal injury, death or
substantial property damage.
DO NOT apply system-bypass piping if the reduced
flow in the system could cause poor heat distribution.
That is, system-bypass piping reduces the flow in the
system and increases the water temperature supplied to
sys-
the system. This can cause increased heat from radiators
at the beginning of the system and reduced heat from
radiators near the end of the system.
Valve adjustment
1. Start with valve
. Gradually open valve
the temperature at gauge
times.
radiant
on
7a
3. Valve
mixed with return water. Valve
drop in the system needed to balance flow through
7a
valve
can be used
4. The valve adjustment should be done with the
system at the coldest expected temperature (0°F
for converted gravity systems or high mass radiant
systems).
system supply temperature
and the
).
system supply temperature
provide controls and piping
no less than 130°F
at regardless of system supply temperature.
(continued)
7a 7b
fully closed and
7a
while closing valve
8
reads at least 130°F at all
regulates the amount of boiler supply water
7b
causes a pressure
and the system.
to the boiler could cause corrosion of
regulating the boiler return
(such as provided by an
relatively constant.
is
regulate the boiler re-
which can
to the boiler could cause corrosion
Part Number 550-101-009/0107
fully open.
7b
until
injec-
outdoor