Weil-McLain GOLD CGt Manual page 22

GOLD CGt Gas-Fired Water Boiler — Boiler Manual
4c
Water piping — multiple zones
Piping multiple zones
Follow instructions on pages 0 and 1 to install near-
boiler piping or for single-zone systems. (Also see
ing for radiant heating systems or converted gravity
systems"
See Figure 18
lation.
Zoning with circulators (Figure 18)
(return temp over 130°F)
1. Size each circulator to individual circuit require-
ments.
. Do not install circulator on boiler (except for pri-
mary/secondary bypass 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 19)
(return temp over 130°F )
1. Install isolation (balancing) valves to adjust flow to
distribute heat to all zones.
. Provide a separate 4-volt transformer to power the
zone valves. Size the transformer to handle the total
rated load of all connected zone valves.

if applicable.)
or Figure 19 , page 3, to complete instal-
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
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 dam-
age.
Piping for radiant heating
systems or converted gravity
systems
"Pip-
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.
Converted gravity (or steam) systems
Whenever possible, use the primary/secondary bypass
piping shown in Figures 20
design allows changing boiler flow rate without affecting
primary circuit flow rate.
Radiant heating systems
Preferably, use primary/secondary bypass piping, as
shown in Figures 20
If radiant system tubing has no oxygen barrier, a
exchanger must be used.
or 21 on page 5. This piping
or 21 on page 5.
outdoor reset
Part Number 550-110-290/0107
heat