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
Water piping — single-zone system3b
Figure 4 Diaphragm- or bladder-type expansion tank
Piping to single-zone system
See Table 3 for piping sizes.
Figure 5 Closed-type expansion tank
Piping to single-zone system
See Table 3 for piping sizes.
Diaphragm-type or bladder-
type expansion tank (Figure 4)
1. Ensureexpansiontanksizewillhandleboilerand
system water volume and temperature. Tank must
be located in boiler return piping as close to boiler
aspossible,beforeinletsideofcirculator.Seetank
manufacturer’s instructions for details.
2. Install an
automatic air vent in air vent tapping as
shown.
Closed-type expansion tank
(Figure 5)
1. Ensureexpansiontanksizewillhandleboilerand
systemwatervolumeandtemperature.Seetank
manufacturer’s instructions for details.
2. Connecttankto½”NPTtappinglocatedbehind
supplyoutlet,using½”NPTpiping.Pitchany
horizontal piping up towards tank 1 inch per 5 feet
of piping.
Undersized expansion tanks cause system water to be lost from relief valve and makeup water
tobeaddedthroughllvalve.Eventualsectionfailurecanresult.
Use Figure 4 or Figure 5 onlyforsingle-zonesystemsdesignedforreturnwateratleast130°F.
For systems with low return water temperature possible, such as converted gravity systems
and radiant heating systems, refer to the special piping suggestions of pages 18-23. Failure to
prevent low return water temperature to the boiler could cause corrosion of the boiler sections
or burners, resulting in severe personal injury, death or substantial property damage.
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