Part number 550-100-180/0917
15
Install water piping
(continued)
Recommended pipe sizing
Size the piping and the pumps to provide the required temperature rise.
See Figure 11 for boiler head loss curves. See Figure 13 for maximum and
minimum flow rate through the boiler as well as head loss vs flow rate.
Size system piping following Figure 12 or apply recognized engineering
practices to size the piping.
$/./4DESIGNTHEPIPINGANDCOMPONENTSFOR
ABOILERmOWRATEABOVEORBELOW
the range given in
Figure 13. Insufficient flow will cause nuisance outages due
to limit operation. Excessive flow can damage the boiler heat
exchanger from erosion.
For applications requiring system flow rates higher or lower
than those allowed in Figure 13, use ONLY primary/second-
ary piping. Size the boiler pump for the proper flow rate.
NOTE 1:
Use at least 3-inch schedule 40 pipe on all boiler
loop piping (connecting boiler to and from the primary/
secondary connection, item 21). Pipe sizing is based on a
temperature rise of 30°F, corresponding to the recom-
mended maximum flow rate. Failure to follow these guide-
lines could result in system problems.
&IGURE
Boiler head loss vs flow rate for SlimFit boilers
&IGURE
Recommended pipe sizing vs flow rate
&IGURE
Flow rate and pressure drop data for
Slim-Fit boilers
!4&5,,).054
DO NOT
design for flow rates above or be-
low the range listed in Figure 13. The boiler
and system components can be damaged by
excessive or insufficient flow. Temperature
rises shown below apply to water only. For
glycol/water applications, the temperature
rise will be different, but the flow rate must
be maintained within the range listed below.
SlimFit
®
Series 2
COMMERCIAL
CONDENSING
GAS
-
FIRED
WATER
BOILER
—
Boiler Manual
SF1000
GPM
Temperature Rise (°F)
Boiler head loss (Feet w.c.)
43
44.5
4.1
50
38.3
5.1
** 63
30.4
7.4
70
27.4
8.7
80
24.0
10.9
90
21.3
13.3
96
20.0
14.8
** Suggested design flow rate (30°F temp. rise, water only)
SF1500
GPM
Temp.
Rise °F
Boiler head loss
Feet w.c.
64
44.9
4.8
75
38.3
6.3
** 96
29.9
9.7
105
27.4
11.3
120
24.0
14.3
135
21.3
17.7
144
20.0
19.9
** Suggested design flow rate (30°F temp. rise, water only)
SF2000
GPM
Temp.
Rise °F
Boiler head loss
Feet w.c.
85
44.8
6.6
100
38.1
7.8
** 127
30.0
11.5
140
27.2
13.5
160
23.8
16.9
180
21.2
20.6
191
20.0
22.8
** Suggested design flow rate (30°F temp. rise, water only)
Sch 40
Pipe
Diameter
Maximum
Flow rate
GPM
Sch 40
Pipe
Diameter
Maximum
Flow rate
GPM
2
45
6
800
3
140
8
1650
4
290
10
3000
5
500
12
4750
For pipe sizes other than 3 inch, provide reducers to adapt from
external piping to the boiler 3-inch supply and return flanged
connections.
