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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)
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