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5
Hydronic piping
Circulator sizing
The Crest heat exchanger does have a pressure drop, which must be considered in your system design. Refer to the graph in
FIG. 5-1 for pressure drop through the Crest heat exchanger.
Figure 5-1 Pressure Drop vs. Flow
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
20
40
Table 5A Sizing Information for Temperature Rise Applications_20°F, 40°F and 60°F
BOILER
Model
CONNECTION SIZE
FB 0751
3"
FB 1001
3"
FB 1251
3"
[Crest models are based on 96% AHRI Effi ciency]
The pressure drop reflected in FIG. 5-1 is
NOTICE
for the boiler only. Additional allowances
must be made for piping, especially if
sizing pumps for Primary/Secondary
applications.
28
CREST Pressure Drop Curve
FB1251
FB1001
60
80
100
120
140
160
Flow Rate (GPM)
TEMPERATURE RISE APPLICATIONS
20°F
GPM
FT/HD
72
96
120
FB751
180
200
220
240
260
40°F
GPM
FT/HD
1.5
36
2.1
48
3.0
60
NOTICE
Installation & Operation Manual
280
300
320
340
360
60°F
GPM
0.5
24
0.6
32
0.9
40
It is required that boiler piping systems
utilize Primary/Secondary or Fixed or
Variable Flow Primary configurations as
shown in FIG.'s 5-2 thru 5-5. The use of
other boiler piping configurations could
result in improper building and system flow
rates leading to inadvertent boiler high limit
shutdowns and poor system performance.
FT/HD
0.2
0.3
0.4
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