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
section 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
19
