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Part number 550-110-260/0508
19
GOLD CGs Gas-Fired Water Boiler — Boiler Manual
1 Boiler isolation (balancing) valves
2 Flow/check valve
3 System or zone circulator
4 System temperature gauges
5 Zone valve
6 Drain valve
7 System temperature valves (see instruc-
tions to the left for adjusting valves)
8 Blend temperature gauge
9 Relief valve
10 Automatic air vent (with diaphragm-type expansion tank), or
connect to tank fi tting (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 waterlog-
ging 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 fi tting as in Figure 5, page 15.)
13 Air separator and automatic vent, if used (Note that the
fi ll valve must always be connected to the expansion tank,
regardless of location of expansion tank, circulator or air
separator.)
Figure 8 Primary/secondary piping
Zoning with circulators
Figure 9 Primary/secondary piping
Zoning with zone valves
3d Piping — low temp systems (continued)