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Part number 550-110-260/0200
16
GOLD CGs Gas-Fired Water Boiler
Water piping — multiple zones3c
Piping for radiant
heating systems or
converted gravity
systems
Converted gravity (or steam) systems
Whenever possible, use the primary/secondary piping shown in Figures 8 or 9 on page 19.
This piping design allows changing boiler flow rate without affecting primary circuit flow
rate.
If
Figures 8 or 9 cannot be used, use the boiler-bypass piping shown in Figure 10 or Figure
11
on page 21. You can also use the piping shown in Figure 12 on page 23 (system-bypass), if
the reduced flow rate in the heating system will not cause heat distribution problems.
Zoning with zone
valves, 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.
Zoning with
circulators, return
temp over 130 °F
1. Size each circulator to individual circuit requirements.
2. Do not install circulator on boiler (except for primary/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 circulator.
Piping multiple zones
Follow instructions on pages 14 and 15 to install near-boiler or single-zone piping. (Also
refer to
Piping for radiant heating systems or converted gravity systems, below, if
applicable.)
See
Figure 6 or Figure 7 to complete installation.
Failure to prevent low return water temperature to the boiler could cause corrosion of the
boiler sections or burners, resulting in severe personal injury, death or substantial property
damage.
Radiant heating systems
Preferably, use primary/secondary piping, as shown in Figures 8 or 9 on page 19. Alternatively,
use the method of either
Figure 10 or Figure 11 on page 21. Do not use the piping of Figure
12
(system-bypass), because this method does not control radiant system supply temperature.
If radiant system tubing has no oxygen barrier, a heat exchanger must be used.
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.
Do not apply the methods in this manual if the system is equipped with an outdoor reset
control
. Instead, provide controls and piping which can regulate the boiler return water
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.