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
Figure 18 Zoning with circulators
— return water 130°F or higher.
Figure 19 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 con-
nect 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.)
13Airseparatorandautomaticvent,ifused(Notethatthellvalve
must always be connected to the expansion tank, regardless of loca-
tion of expansion tank circulator or air separator.
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 20 – 24, 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.
Water piping — multiple zones (continued)4c
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