Weil-McLain GOLD CGt Manual page 22

GOLD CGt Gas-Fired Water Boiler — Boiler Manual
4c
Piping multiple
zones
Zoning with
circulators, return
temp over 130 °F
Zoning with zone
valves, return temp
over 130 °F
Piping for radiant
heating systems or
converted gravity
systems
22
Water piping — multiple zones
Follow instructions on pages 20 and 21 to install near-boiler or single-zone piping. (Also
refer to
Piping for radiant heating systems or converted gravity systems
See or to complete installation.
Figure 18 Figure 19
1. Size each circulator to individual circuit requirements.
2. Do not install circulator on boiler (except for primary/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 circulator.
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.
Converted gravity (or steam) systems
Whenever possible, use the primary/secondary bypass piping shown in
25. This piping design allows changing boiler flow rate without affecting primary circuit flow rate.
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 bypass piping, as shown in
If radiant system tubing has no oxygen barrier, a
Radiant heating system piping should include a means of regulating the boiler return water
temperature the system supply temperature (such as provided by an injection pumping
and
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.
, below, if applicable.)
Figures 20 or 21
Figures 20 or 21
must be used.
heat exchanger
Part Number 550-110-290/0501
on page
on page 25.
outdoor reset