Weil-McLain CGS-4E Boiler User Manual


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Part number 550-110-282/1108
17
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CGs-4E Gas-Fired Water Boiler — Boiler Manual
Figure 6 Zoning with circulators
— return water 130°F or higher.
Figure 7 Zoning with zone valves
— return water 130°F or higher.
1 Boiler isolation (balancing)
valves
2 Flow/check valve
3 Systemorzonecirculator
5 Zonevalve
6 Drainvalve
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 5, page 15.)
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.
3c Water piping — multiple zones (continued)
For systems with possible low return-water temperature (such as converted gravity systems,
radiant heating systems and heat pump systems), refer to the special piping suggestions of
Figures 8 - 12, as applies. Failure to prevent sustained low return water temperature to the
boiler could cause corrosion of the boiler sections, resulting in severe personal injury, death
or substantial property damage.
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