Weil-McLain GOLD CGS 550-110-260/0107 Manual page 17

GOLD CGs Gas-Fired Water Boiler — Boiler Manual
3c
Water piping — multiple zones
Figure 6
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 550-110-260/0107
Zoning with circulators
— return water 130°F or higher.
10
Automatic air vent (with diaphragm-type expansion tank), or connect
11
Fill valve
12
Diaphragm-type or bladder-type expansion tank, if used (For closed-
13
Air separator and automatic vent, if used (Note that the fill valve must
For systems with possible low return-water temperature (such as converted gravity systems,
radiant heating systems and heat pump systems), refer to the special piping suggestions of
Figures 8 - 12
, as applies. Failure to prevent sustained low return water temperature to the
boiler could cause corrosion of the boiler sections, resulting in severe personal injury, death
or substantial property damage.
Figure 7
to tank fitting (closed-type expansion tank).
air vent when using closed-type expansion tank. It would allow air to
leave the system, causing waterlogging of the expansion tank.
type expansion tank, pipe from top of air separator to tank fitting as in
Figure 5
, page 15.)
always be connected to the expansion tank, regardless of location of
expansion tank circulator or air separator.
(continued)
Zoning with zone valves
— return water 130°F or higher.
DO NOT use an automatic
1