18
9.
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 PFC-850 with a design
temperature difference of 20°F the calculation is as
follows:
Output 816,000
Required Flow =
________
=
_________
= 81.6 GPM
D
T
x 500
20 x 500
d. The boiler pressure drop for various flow rates
can be determined using Figure 4.3,
P
ure
F
ire
®
Circulator Sizing Graph below.
WATER PIPING & CONTROLS
Figure 4.3:
P
ure
F
ire
®
Circulator Sizing Graph (General Pump – Primary/Secondary)
Figure 4.2: Relief Valve and Pressure/Temperature
Gauge Installation
Table 4.4: Boiler Input and Output
P
ure
F
ire
®
Model
Boiler Input
Boiler Output
Btu/hr
kW
Btu/hr
kW
PFC-850
850,000
249
817,700
240
PFC-1000
1,000,000
293
966,000
283
PFC-1500
1,500,000
440
1,447,500
424
Содержание PUREFIRE PFC-1000
Страница 1: ...PUREFIRE Boilers PFC 850 PFC 1000 PFC 1500 Gas Installation Operation Maintenance Manual ...
Страница 23: ...21 WATER PIPING CONTROLS Figure 4 4 Recommended Piping One Boiler with Multiple CH Zones One DHW Tank ...
Страница 24: ...22 WATER PIPING CONTROLS Figure 4 5 Recommended Piping Multiple Boilers with Multiple CH Zones One DHW Tank ...
Страница 62: ...60 START UP PROCEDURE J LIGHTING OPERATING INSTRUCTIONS Figure 9 1 Lighting Operating Instructions ...
Страница 80: ...78 REPAIR PARTS Figure 13 3a Jacket Assembly PFC 850 1000 Figure 13 3b Jacket Assembly PFC 1500 ...
Страница 82: ...80 Figure 13 4 Control System REPAIR PARTS ...
Страница 84: ...82 Figure 13 5 Condensate System REPAIR PARTS ...
Страница 89: ...87 APPENDIX B BURNER LCD STATUS SCREENS CH Burn Cycle DHW Burn Cycle Special Functions DHW Tank Warm Hold ...
Страница 90: ...88 APPENDIX C USER MENU APPENDIX C USER MENU Figure C 1 User Menu Managing Burner ...
Страница 91: ...89 APPENDIX C USER MENU Figure C 1 User Menu Dependent Burner ...
Страница 92: ...90 APPENDIX D INSTALLER MENU STRUCTURE APPENDIX D INSTALLER MENU STRUCTURE ...
Страница 93: ...91 APPENDIX D INSTALLER MENU STRUCTURE ...
Страница 95: ...93 SERVICE LOG SERVICE LOG Date Serviced By Description of Service Serial Number ...
Страница 96: ...94 NOTES ...
Страница 97: ...95 NOTES ...