PEERLESS PureFire PF-200 Installation, Operation & Maintenance Manual page 21

Figure 4.2: Relief Valve Installation – PF-50, PF-80,
PF-110 & PF-140
10. Circulator: The boiler circulator is to be sized to
overcome the pressure drop of the system while
providing the flow required by the boiler.
a. If the boiler is piped in a secondary loop of a
primary/secondary heating system, the circulator
will need only to overcome the resistance of the
boiler and any fittings in that loop.
b. The circulator should be sized based on gross
output of the boiler. Table 4.3 shows the Boiler
Output as reported to the Hydronics Institute
Section of AHRI.
c. The required flow is calculated based on the design
temperature difference from the return to the supply
of the boiler. For a PF-110 with a design temperature
difference of 20°F the calculation is as follows.
Required Flow = ________ = _________ = 10.1 GPM
Δ T x 500
Figure 4.4: P F ® Circulator Sizing Graph (General Pump – Primary/Secondary)
URE IRE
Output 101,000
20 x 500
WATER PIPING AND CONTROLS
Table 4.3: Boiler Inputs and Outputs
P F ®
Boiler Input
URE IRE
Model Btu/hr (kW)
PF-50 50,000 (14.7)
PF-80 80,000 (23.4)
PF-110 110,000 (34.2)
PF-140 140,000 (41.0)
PF-200 199,000 (58.3)
PF-210 210,000 (61.5)
PF-300 300,000 (87.9)
PF-399 399,000 (116.9)
Figure 4.3: Relief Valve Installation – PF-200, PF-210,
PF-300, PF-399 & PF-460
Gross Output
Btu/hr (kW)
46,000 (13.5)
74,000 (21.7)
102,000 (29.9)
131,000 (38.4)
183,000 (53.6)
193,000 (56.6)
289,000 (84.9)
373,000 (109.3)
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