Bryan Boilers FREE FLEX, Installation & Operation Manual, Page: 41 / 100

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Bryan Steam, LLC www.bryanboilers.com
Phone: 765-473-6651 783 N Chili Ave, Peru, IN 46970 sales@bryansteam.com
See Appendix F for boiler water flow pressure drop
data and Appendix E for piping.
1. Water Flow Rates ( Variable Primary Pumping
Systems )
a. Variable primary pumping systems shall
be capable of delivering no less than the
minimum and no more than the maximum
specified in Table 20 and Table 21 for each
boiler connected in the system.
Table 20: Minimum Water Flow Rates for
Variable Primary Pumping
Free Flex
Model
Minimum Flow Rate
gpm Δ P (ft)
High Fire Δ
T (°F)
1000 19 .51 100
1500 29 .37 100
2000 38 .65 100
2500 48 .8 100
3000 57 1.15 100
3500 67 .42 100
4000 76 .42 100
4500 86 .42 100
5000 95 .5 100
5500 105 .58 100
6000 114 .67 100
Note: not for sizing constant volume pump
Table 21: Maximum Water Flow Rate for
Variable Primary Pumping
Free Flex
Model
Maximum Flow Rate
gpm Δ P (ft)
High Fire Δ
T (°F)
1000 95 12.7 20
1500 143 9.2 20
2000 190 16.3 20
2500 238 20 20
3000 285 28.7 20
3500 333 11.33 20
4000 380 15.17 20
4500 428 25.17 20
5000 475 33.5 20
5500 523 37.25 20
6000 570 37.92 20
Note: not for sizing constant volume pump
2. Water Flow Rates ( Primary/Secondary Systems )
a. Each boiler connected to a secondary loop
of a primary / secondary pumping system
shall have a constant volume pump sized in
accordance with Table 22 or Table 23.
Table 22: Water Flow Rates for Primary/
Secondary Pumping at 20°F ΔT
Free Flex
Model
20°F ΔT Flow Rate
gpm ΔP (ft) High Fire Δ
T (°F)
Low Fire
ΔT (°F)
1000 95 12.7 20 4
1500 143 9.2 20 4
2000 190 16.3 20 4
2500 238 20 20 4
3000 285 28.7 20 4
3500 333 11.33 20 4
4000 380 15.17 20 4
4500 428 25.17 20 4
5000 475 33.5 20 4
5500 523 37.25 20 4
6000 570 37.92 20 4
Table 23: Water Flow Rates for Primary/
Secondary Pumping at 40°F ΔT
Free Flex
Model
40°F ΔT Flow Rate
gpm ΔP (ft) High Fire Δ
T (°F)
Low Fire
ΔT (°F)
1000 48 3.18 40 8
1500 71 2.3 40 8
2000 95 4.08 40 8
2500 119 5 40 8
3000 143 7.18 40 8
3500 166 2.67 40 8
4000 190 3.17 40 8
4500 214 6.25 40 8
5000 238 7.92 40 8
5500 261 9.25 40 8
6000 285 9.42 40 8