Weil-McLain GOLD CGS 550-110-260/0508 User Manual page 22

GOLD CGs Gas-Fired Water Boiler — Boiler Manual
3d
Piping — low temp 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
fl ow through valve
Figure 12
return water temperature control for boilers installed
on
converted gravity systems
steam systems).
apply the piping of
Do not
ing systems
temperature provided to the system and could result in
excessive water temperature in the radiant tubing.
System-bypass piping as shown in
with either zone valve or circulator zoning. When used
with circulator zoning however, the boiler circulator
22
, page 23) is called a
Figure 12
because part of the circulator fl ow bypasses
). This bypassed hot water
7a
will most often be
7b
.
7a
is an alternative piping method that provides
(large water content or
on
Figure 12
. It provides no method regulating the water
Figure 12
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
water temperature
tion 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.
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.
(item ), must be piped as shown. It cannot be used as
3
one of the zoning circulators.
Do not apply system-bypass piping if the reduced fl ow
in the system could cause poor heat distribution. That
sys-
is, system-bypass piping reduces the fl ow 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.
Valve adjustment
1. Start with valve
2. Gradually open valve
the temperature at gauge
times.
3. Valve
7a
radiant heat-
mixed with return water. Valve
drop in the system needed to balance fl ow through
valve
7a
4. The valve adjustment should be done with the
can be used system at the coldest expected temperature (60°F
for converted gravity systems or high mass radiant
systems).
and the
system supply temperature
).
system supply temperature
provide controls and piping
at
no less than 130°F
(continued)
fully closed and
7a
while closing valve
7a
reads at least 130°F at all
8
regulates the amount of boiler supply water
causes a pressure
7b
and the system.
to the boiler could cause corrosion of
regulating the boiler return
(such as provided by an
is
relatively constant.
which can
regulate the boiler re-
regardless of system supply temperature.
to the boiler could cause corrosion
Part number 550-110-260/0508
fully open.
7b
until
7b
injec-
outdoor