Weil-McLain CGa 2 Series Manual page 24

CGa Series 2 Gas-Fired Water Boiler — Boiler Manual
3d
Water piping — low temperature systems
SYSTEM-bypass piping
method
This piping method (
passes the system (through valve
water from the boiler outlet mixes with cooler system
return water temperature in order to provide minimum
be full open, but may need to be slightly closed on some
low pressure drop systems in order to cause enough flow
through valve
return water temperature control for boilers installed
on
or steam 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
(item ), must be piped as shown. It cannot be used as
one of the zoning circulators.
24
, page 25) is called a
because part of the circulator flow by-
). This bypassed hot
.
is an alternative piping method that provides
(large water content
apply the piping of
. It provides no method of regulat-
Failure to
of the boiler sections or burners, resulting in severe personal injury, death or substantial
property damage.
in this manual provided the
apply the methods of this manual if the system is equipped with an
DO NOT
Instead,
at
Failure to
damage to the sections or burners, resulting in possible severe personal injury, death or
substantial property damage.
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
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.
will most often
Valve adjustment
1. Start with valve
the temperature at gauge reads at least 130°F at all
times.
on
drop in the system needed to balance flow through
valve
can be used
4. The valve adjustment should be done with the
system at the coldest expected temperature (60°F
for converted gravity systems or high mass radiant
systems).
and the
).
regardless of system supply temperature. Contact your
apply system-bypass piping if the reduced
fully closed and
while closing valve
regulates the amount of boiler supply water
and the system.
to the boiler could cause corrosion
(such as provided by an
is
which can
to the boiler could cause corrosion
Part Number 550-142-900/1016
(continued)
fully open.
until
causes a pressure