Weil-McLain CGI-4E Boiler User Manual


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Part Number 550-110-711/1108
27
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CGi-4E 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in-
structions 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 17, page 21).
13Airseparatorandautomaticvent,ifused(Notethatthellvalve
must always be connected to the expansion tank, regardless of
location of expansion tank, circulator or air separator.)
Figure 22 Boiler-bypass piping — Zoning with
circulators — (Alternative to primary/
secondary piping Figures 20 and 21)
Figure 23 Boiler-bypass piping — Zoning with
zone valves — (Alternative to primary/
secondary piping Figures 20 and 21)
Piping — low temperature systems (continued)4d
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