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
3 Systemorzonecirculator
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 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.)
Figure 12 System-bypass piping
Zoning with zone valve or circulators,
return water 130°F or higher.
(Alternative to boiler-bypass piping
Figures 10 and 11, page 21)
Figure 13 Piping refrigeration systems
Water piping — refrigeration systems
Prevent chilled water from entering
boiler
Install boiler so that chilled medium is piped in parallel
with the heating boiler. Use appropriate valves to prevent
chilledmediumfromenteringboiler.See
Figure 13 for
typical installation of balancing valve and check valve.
If boiler is connected to heating coils located in air han-
dling units where they can be exposed to refrigerated
air, use flow control valves or other automatic means to
prevent gravity circulation during cooling cycle.
3d Piping — low temp systems (continued)
3e
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