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Part number 550-110-260/0107
21
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 instructions to the left
for adjusting valves)
8 Blend temperature gauge
9 Relief valve
10 Automatic air vent (with diaphragm-type expan-
sion 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 wa-
terlogging 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 5,
page 15.)
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.)
Figure 10 Boiler-bypass piping
Zoning with circulators
Alternative to primary/secondary piping
Figures 8 and 9)
Figure 11 Boiler-bypass piping
Zoning with zone valves
(Alternative to primary/secondary piping
Figures 8 and 9)
3d Piping — low temp systems (continued)