Piping Multiple Zones - Weil-McLain GOLD CGS 550-110-260/0508 User Manual

GOLD CGs Gas-Fired Water Boiler — Boiler Manual
3c
Water piping — multiple zones

Piping multiple zones

Follow instructions on pages 14 and 15 to install near-
boiler or single-zone piping. (Also refer to
radiant heating systems or converted gravity sys-
, below, if applicable.)
tems
See
Figure 6
lation.
Zoning with circulators (Figure 6)
(return temp over 130°F)
1. Size each circulator to individual circuit require-
ments.
2. Do not install circulator on boiler (except for pri-
mary/secondary piping).
3. Install isolation (balancing) valves to adjust fl ow to
distribute heat to all zones.
4. Install and wire a separate relay for each zone cir-
culator.
Zoning with zone valves (Figure 7)
(return temp over 130°F)
1. Install isolation (balancing) valves to adjust fl ow 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.
16
or , page 17, to complete instal-
Figure 7
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
control). Boiler return water temperature will be adequately controlled using the methods
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
DO NOT
. Instead, provide controls and piping which can regulate the boiler return water
control
temperature at no less than 130°F regardless of system supply temperature. Contact your
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
damage.
Piping for radiant heating
systems or converted gravity
Piping for
systems
Converted gravity (or steam) systems
Whenever possible, use the primary/secondary piping
shown in
Figures 8
allows changing boiler fl ow rate without affecting pri-
mary circuit fl ow rate.
If or
Figures 8
piping shown in
can also use the piping shown in
(system-bypass), if the reduced fl ow rate in the heating
system will not cause heat distribution problems.
Radiant heating systems
Preferably, use primary/secondary piping, as shown
in
Figures 8
method of either
Do not use the piping of Figure 12
because this method does not control radiant system
supply temperature.
If radiant system tubing has no oxygen barrier, a
must be used.
exchanger
or on page 19. This piping design
9
cannot be used, use the boiler-bypass
9
or on page 21. You
Figure 10 Figure 11
Figure 12
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.
or on page 19. Alternatively, use the
9
or
Figure 10 Figure 11
(system-bypass),
outdoor reset
Part number 550-110-260/0508
on page 23
on page 21.
heat