Weil-McLain CGS-4E Boiler User Manual


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Part number 550-110-282/1108
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CGs-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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 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 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 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 8 Primary/secondary piping
Zoning with circulators
Figure 9 Primary/secondary piping
Zoning with zone valves
3d Piping — low temp systems (continued)
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