Weil-McLain GOLD CGt Manual page 23

GOLD CGt Gas-Fired Water Boiler — Boiler Manual
4c
Water piping — multiple zones
Figure 18
1
Boiler isolation (balancing) valves
2
Flow/check valve
3
System or zone circulator
5
Zone valve
6
Drain valve
9
Relief valve
Part Number 550-110-290/0107
Zoning with circulators
— return water 130°F or higher.
For systems with possible
radiant heating systems and heat pump systems), refer to the special piping suggestions of
Figures 0 – 1, page 5, as applies. Failure to prevent sustained low return water tempera-
ture to the boiler could cause corrosion of the boiler sections, resulting in severe personal
injury, death or substantial property damage.
Figure 19
10
Automatic air vent (with diaphragm-type expansion tank), or con-
nect to tank fitting (closed-type expansion tank).
automatic air vent when using closed-type expansion tank. It would
allow air to leave the system, causing waterlogging of the expansion
tank.
11
Fill valve
12
Diaphragm-type or bladder-type expansion tank
13
Air separator with automatic vent, if used (Note that the fill valve
must always be connected to the expansion tank.)
low return-water temperature
(continued)
Zoning with zone valves
— return water 130°F or higher.
DO NOT
(such as converted gravity systems,
use an
3