Filter
Top Products
Part Number 550-101-009/0107
19
GOLD CGa Gas-Fired Water Boiler — Boiler Manual
Figure 11 Zoning with circulators — return water
130°F or higher.
Figure 12 Zoning with zone valves — return water
130°F or higher.
1 Boiler isolation (balancing)
valves
2 Flow/check valve
3 System or zone circulator
5 Zone valve
6 Drain valve
9 Relief valve
10 Automatic air vent (with diaphragm-type expansion tank), or connect
to tank fitting (closed-type expansion tank). DO NOT use an 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, if used (For closed-
type expansion tank, pipe from top of air separator to tank fitting as in
Figure 10, page 17.)
13 Air separator and automatic vent, if used (Note that the fill valve must
always be connected to the expansion tank, regardless of location of
expansion tank circulator or air separator.
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 13 – 17, 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.
Water piping — multiple zones (continued)3c