Circulator Sizing - Crest Audio FB(N,L)1500 Installation & Operation Manual

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
18.00
17.00
16.00
15.00
14.00
13.00
12.00
11.00
10.00
9.00
8.00
7.00
6.00
5.00
4.00
3.00
2.00
1.00
0.00
20 40 60
Table 5A Sizing Information for Temperature Rise Applications_20°F, 40°F and 60°F
BOILER
Model
CONNECTION SIZE
FB 1500 4"
FB 2000 4"
FB 2500 4"
FB 3000 4"
FB 3500 4"
FB 4000 4"
FB 5000 4"
[Models FB 1500 - 3500 based on 92% AHRI Effi ciency and Models FB 4000 - 5000 based on 93% Effi ciency]
*Flow is based on 30°FT.
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.
(continued)
CREST Pressure Drop Curve
80 100 120 140 160 180
Flow Rate (GPM)
TEMPERATURE RISE APPLICATIONS
20°F
GPM FT/HD
138 3.4
184 4.1
230 4.6
276 5.6
322 7.5
248* 4.2
310* 4.5
Installation & Operation Manual
200 220 240 260 280 300
40°F
GPM FT/HD
69 1.0
92 1.2
115 1.4
138 1.7
161 2.2
186 1.8
233 0.9
It is required that boiler piping systems
NOTICE
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.
FB1500
FB2000
FB2500
FB3000
FB3500
FB4000
FB5000
320 340
60°F
GPM FT/HD
46 0.5
61 0.6
77 0.7
92 0.8
107 1.1
124 0.9
155 0.5
25