Page 9 - Webster Service Manual

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shown in drawing below . No return line is necessary
from the water heater as the system is flooded due to
the siphoning action when the tank is above burner
level.
Existing Outside Tank Installation —
Tank Below Burner Level
The water heater may be added to the system by
installing a check valve in the suction line at both fuel
units as shown in drawing below. Both units must be set
for (2) two-pipe operation. This method should only be
used when it's impossible to add an independent suction
line to the water heater as shown in bottom drawing
New Outside Tank Installation —
Tank Below Burner Level
Individual suction lines should be used on all new instal-
lations. Return lines may be manifolded as shown in
drawing below.