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0246810121416
Pressure Drop (ft. w.c.)
Flow Through Heat Exchanger and Near-Boiler Piping (GPM)
70/110 Models 155 Model
Model
FLOW
(GPM)
HEAD
(ft. w.c.)
Circulators
Taco
(Std. Models)
Taco
(3 speed Models)
Grundfos
20°F Temperature Rise Application
70 6.5 3.0 007 * 007 (Lo)* UPS 15-42 F (Spd 1) *
110 10.1 6.6 007 * 0015 (Med) UPS 15-42 F (Spd 3) *
155 14.3 9.7 0014 – UPS 26-99 FC
25°F Temperature Rise Application
70 5.2 2.0 007 * 007 (Lo)* UPS 15-42 F (Spd 1) *
110 8.1 4.4 007 * 007 (Med) UPS 15-42 F (Spd 2) *
155 11.4 7.4 007 0015 (Hi) UPS 15-42 F (Spd 3)
30°F Temperature Rise Application (RECOMMENDED)
70 4.3 1.5 007 * 007 (Lo)* UPS 15-42 F (Spd 1) *
110 6.7 3.2 007 * 007 (Lo)* UPS 15-42 F (Spd 1) *
155 9.5 6.0 007 * 0010 (Lo) UPS 15-42 F (Spd 2)
35°F Temperature Rise Application
70 3.7 1.1 007 * 007 (Lo)* UPS 15-42 F (Spd 1) *
110 5.8 2.4 007 * 007 (Lo)* UPS 15-42 F (Spd 1) *
155 8.2 5.2 007 * 007 (Med) UPS 15-42 F (Spd 2) *
40°F Temperature Rise Application
70
3.3
0.9 007 * 007 (Lo)* UPS 15-42 F (Spd 1) *
110
5.1
1.9 007 * 007 (Lo)* UPS 15-42 F (Spd 1) *
155
7.2
4.7 007 * 007 (Lo) UPS 15-42 F
System water piping methods
.EARBOILERPIPING
1. Connect boiler to system only as shown in Figure 46
and Figure 47, page 44. The primary/secondary
piping shown ensures the boiler loop will have
sufficient flow.
2. Select a boiler loop temperature rise from
Figure 48, page 44. The table indicates the flow
and head loss characteristics at that temperature
rise and suggests potential circulators. Circulators
of other brands not listed (Wilo, Armstrong, B&G)
are acceptable if they meet the flow and head
requirements of the design.
Verify that the boiler loop piping matches
closely with the listed criteria in the
NOTICE below. If near boiler piping is
different, calculate head loss separately
using heat exchanger pressure drop
information from Figure 43, page 38 and
match to an appropriate pump.
The pressure drops shown are for
near boiler piping as illustrated in
Figure 46, page 42 and Figure 47 with 20
feet of straight piping.
&IGURE Estimated head loss of boiler loop piping and recommended circulators.
&IGURE Estimated head loss of boiler loop piping and
recommended circulators.
155
70/110
Part number 550-142-122/0513
44
TM
GAS-FIRED WATER BOILER — Boiler Manual
Primary/Secondary System piping (continued)
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