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Part Number 550-142-300/0520
23
CGa Series 3 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 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.)
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 15 Boiler-bypass piping
Zoning with circulators
(Alternative to primary/secondary piping
Figures 13 and 14)
Figure 16 Boiler-bypass piping
Zoning with zone valves
(Alternative to primary/secondary piping
Figures 13 and 14)
Water piping — low temperature systems (continued)3d
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