Weil-McLain EG Manual page 15

EG PEG EGH
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Connect piping – water boilers
Figure 13
Recommended piping – forced hot water
boilers with closed type expansion tanks
Figure 14
Recommended piping – forced hot water
boilers with diaphragm type expansion
tanks
Part Number 550-110-639/0512
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Gas firEd boilErs
— 4 —
sEriEs boilEr manual
(continued)
Use Figure 13 or Figure 14 only for 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, install bypass pip-
ing (see page 16) to protect boiler against condensation.
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.
If system includes radiant heating circuits, provide pip-
ing and controls to regulate the temperature supplying
the radiant circuits. Failure to comply could result in
substantial property damage.
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 15 for
typical installation of balancing valve and check valve.
Install boiler so that chilled medium is piped in parallel
with heating boiler (Figure 15). Use appropriate valves
to prevent chilled medium from entering boiler. Consult
AHRI Installation and Piping Guides.
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. Circu-
lation of cold water through the boiler could result in
damage to the heat exchanger, causing possible severe
personal injury, death or substantial property damage.
Figure 15
Recommended piping – refrigeration
systems
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