MODEL PIPE SIZE MIN. GPM MAX. GPM*
268 1-1/4”–1-1/2” - 2” 25 125
408 1-1/4”–1-1/2” - 2” 40 125
*When flow rates exceed maximum GPM an external auxil-
iary bypass valve is required. See external bypass valve
s
ection for details.
FLOW RATES
HEAT EXCHANGER PRESSURE DROP
FLOW
GPM
PRESSURE DROP (FT OF HEAD)
268 408
30 8.0
40 9.0 9.0
50 9.8 9.8
60 10.5 10.5
70 11.0 11.0
80 11.5 11.5
90 14.0 14.0
100 17.0 17.0
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