Weil-McLain GOLD CGa Manual page 18

GOLD CGa Gas-Fired Water Boiler — Boiler Manual
3c
Water piping — multiple zones
Piping multiple zones
Follow instructions on pages 16 and 17 to install near-
boiler or single-zone piping. (Also refer to
below, if applicable.)
See
stallation.
Zoning with circulators (Figure 11)
(return temp over 130°F)
1. Size each circulator to individual circuit require-
ments.
mary/secondary piping).
3. Install isolation (balancing) valves to adjust flow to
distribute heat to all zones.
4. Install and wire a separate relay for each zone cir-
culator.
Zoning with zone valves (Figure 12)
(return temp over 130°F)
1. Install isolation (balancing) valves to adjust flow to
distribute heat to all zones.
2. Provide a separate 24-volt transformer to power the
zone valves. Size the transformer to handle the total
rated load of all connected zone valves.
18
or
Radiant heating system piping should include a means of regulating the boiler return water
temperature and the system supply temperature (such as provided by an injection pumping
shown in this manual provided the system supply temperature is relatively constant.
apply the methods in this manual if the system is equipped with an
. Instead, provide controls and piping which can regulate the boiler return water
Weil-McLain representative for suggested piping and control methods. Failure to prevent
cold return water temperature to the boiler could cause corrosion damage to the sections
or burners, resulting in possible severe personal injury, death or substantial property dam-
age.
Piping for radiant heating
systems or converted gravity
systems
Converted gravity (or steam) systems
-
Whenever possible, use the primary/secondary piping
shown in or
sign allows changing boiler flow rate without affecting
primary circuit flow rate.
If or cannot be used, use the boiler-bypass
piping shown in
can also use the piping shown in
(system-bypass), if the reduced flow rate in the heating
-
system will not cause heat distribution problems.
Failure to prevent low return water
temperature to the boiler could
cause corrosion of the boiler sec-
tions or burners, resulting in severe
personal injury, death or substantial
property damage.
Radiant heating systems
Preferably, use primary/secondary piping, as shown
in or on page 21. Alternatively, use the
method of either
because this method does not control radiant system
supply temperature.
If radiant system tubing has no oxygen barrier, a
must be used.
on page 21. This piping de-
or
on page 25
or on page 23.
(system-bypass),
Part Number 550-101-009/0107