PEERLESS PUREFIRE PF-850 - Page 20

18
f. Table 4.5 provides a list of recommended
circulators for boilers on a secondary loop of a
primary secondary system which uses water as a
heating medium.
g. Special consideration must be given if a glycol
based anti-freeze solution is used as a heating
medium. Propylene glycol has a higher viscosity
than water, therefore the system pressure drop will
be higher.
Table 4.4: Flow Rate & Pressure Drop for Various System Temperature Rise Values
DT
(°F)
Flow Rate & Pressure Drop
PF-850 PF-1000
GPM FT cu. m/hr mbar GPM FT cu. m/hr mbar
10 163.5 91.90 37.14 2747 193.2 98.87 43.88 2955
15 109.0 42.65 24.76 1275 128.8 45.37 29.25 1356
20 81.8 24.94 18.57 745 96.6 26.30 21.94 786
25 65.4 16.52 14.86 494 77.28 17.32 17.55 518
30 54.5 11.83 12.38 353 64.4 12.35 14.63 369
35 46.7 8.93 10.61 267 55.2 9.29 12.54 278
40 39.5 6.57 8.97 196 48.3 7.29 10.97 218
Table 4.5: Circulator Selection Chart (General Pump – Primary/Secondary Piping)
Circulator
Manufacturer
DT
(°F) PF-850 PF-1000
Taco
20
1635/1935, 138, 133 1635/1935
Grundfos UPS50-160/2F speed 2 UPS50-160/2F, speed 3
Bell & Gossett PD-38 PD-38
Wilo - Top S (1 Ph) 2.0 x 50 (max) 2.0 x 50 (max)
Wilo - Stratos 2.0 3 x 35 3.0 3 x 30
Taco
25
1635/1935, 132 1635/1935, 132
Grundfos UPS40-80/4F speed 3 UPS50-80/4F, speed 3
Bell & Gossett PL-130 PL-130
Wilo - Top S (1 Ph) 1.5 x 30 (max) 1.5 x 30 (min)
Wilo - Stratos 1.5 3 x 40 1.5 3 x 40
Taco
30
1611/1911, 131, 122, 121 1635/1935, 131
Grundfos UPS50-60F, speed 3 UPS40-80/4F, speed 3
Bell & Gossett 2.5" / LD3 2.5" / LD3
Wilo - Top S (1 Ph) 1.5 x 30 (min) 1.5 x 30 (min)
Wilo - Stratos 1.5 3 x 40 1.5 3 x 40
Taco
35
122, 121 122
Grundfos UPS50-60F, speed 2 UPS50-60F, speed 3
Bell & Gossett PL-75 2.5" / LD3
Wilo - Top S (1 Ph) 1.5 x 20 (max) 1.5 x 20 (max)
Wilo - Stratos 1.25 3 x 30 1.25 3 x 30
Taco
40
120 2400-60/2400-65
Grundfos UPS43-44FC, speed 3 UPS50-60F, speed 2
Bell & Gossett PL-45/NRF-45 PL-45
Wilo - Top S (1 Ph) 1.5 x 20 (min) 1.5 x 20 (min)
Wilo - Stratos 1.25 3 x 30 1.25 3 x 30
WATER PIPING & CONTROLS
The circulator sizing given is for primary/secondary
installations only. The system circulators must be
sized based on the flow and pressure drop
requirements of the system.
NOTICE