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Part Number 550-142-303/1120
15
EG
/
PEG sEriEs 6
•
EGH sEriEs 5 Gas-firEd boilErs — boilEr manual
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
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 piping (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
piping and controls to regulate the temperature sup-
plying 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 ap-
propriate valves to prevent chilled medium from
entering boiler. Consult AHRI Installation and
Piping Guides.
If boiler is connected to heating coils located in
air handling units where they can be exposed to
refrigerated air, use flow control valves or other au-
tomatic means to prevent gravity circulation during
cooling cycle. Circulation 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
Connect piping – water boilers – EG only (continued)
DO NOT connect directly from 3-wire zone
valves to the T-T terminals on the boiler
.
When using 3-wire zone valves, install an isolation
relay. Connect the zone valve end switch wires to
the isolation relay coil. Connect the isolation relay
contact across the boiler T-T terminals. Failure
to comply can result in damage to boiler com-
ponents or cause unreliable operation, resulting
in severe property damage.
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