Weil-McLain CGI-4E Boiler User Manual


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Part Number 550-110-711/1108
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CGi-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 17,
page 21.)
Figure 24 System-bypass piping — Zoning with
zone valve or circulators, return water
130°F or higher — (Alternative to boiler-
bypass piping Figures 22 and 23)
Figure 25 Piping refrigeration systems
4e
Prevent chilled water from
entering boiler
Water piping — refrigeration system
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25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.
Piping — low temperature systems (continued)4d
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