47
BOILER CONTROL: OPERATION
g. Warm Weather Shutdown: If the boiler is set to
operate in CH Mode 1 or 2, the
P
ure
F
ire
®
control
is set by default to prevent the boiler from operating
to satisfy a central heat demand if the outdoor
temperature is above 70°F (21°C). This value can
be adjusted using the values shown below.
If the installer prefers to use custom values for the
outdoor reset parameters, the following provides
guidance.
h. Design Point: The design point is defined by the
outdoor design temperature
and the
boiler
design temperature
.
i. Boiler Design Temperature: The boiler design
temperature is the temperature at which the boiler
is designed to operate in order to meet the load.
Copper finned tube radiators are typically rated at
180°F (82°C). The Table 8.19 shows typical boiler
design temperatures for different types of head
distribution units.
j. Outdoor Design Temperature: The heat loss for
the structure is determined by considering the
coldest sustained outdoor temperature that is
expected at the site location. For a detailed list
of outdoor design temperatures by state, refer to
the H-22 heat loss calculation guide published by
AHRI.
Figure 8.35: Outdoor Reset Operation
Table 8.17: System Type Presets
System Type
Temperatures
Boiler
Design
Mild Weather
Boiler
1. Finned Tube Baseboard
180
140
2. Hydro Air Unit
190
140
3. Cast Iron Radiator
160
120
4. Cast Iron Baseboard
150
110
5. Low Mass Radiant
140
70
6. High Mass Radiant
120
70
7. user Defined (Default)
180
70
Table 8.18: Warm Weather Shutdown Range &
Default
Parameter
Minimum
Default
Maximum
Warm Weather Shutdown 35°F (-18°C) 70°F (21°C) 100°F (38°C)
Table 8.19: Reset Curve Design Ranges & Defaults
Parameter
Minimum
Default
Maximum
Boiler Design Temp.
61°F (16°C) 180°F (82°C) 195°F (91°C)
Outdoor Design Temp.
-40°F (-40°C) 0°F (-18°C)
70°F (21°C)
Figure 8.36: CH Settings – Reset Curve Design
Managing Burner Only
Figure 8.34: CH Settings – Warm Weather Shutdown
Managing Burner Only
Summary of Contents for PUREFIRE PFC-1000
Page 1: ...PUREFIRE Boilers PFC 850 PFC 1000 PFC 1500 Gas Installation Operation Maintenance Manual ...
Page 82: ...80 Figure 13 4 Control System REPAIR PARTS ...
Page 84: ...82 Figure 13 5 Condensate System REPAIR PARTS ...
Page 90: ...88 APPENDIX C USER MENU APPENDIX C USER MENU Figure C 1 User Menu Managing Burner ...
Page 91: ...89 APPENDIX C USER MENU Figure C 1 User Menu Dependent Burner ...
Page 92: ...90 APPENDIX D INSTALLER MENU STRUCTURE APPENDIX D INSTALLER MENU STRUCTURE ...
Page 93: ...91 APPENDIX D INSTALLER MENU STRUCTURE ...
Page 95: ...93 SERVICE LOG SERVICE LOG Date Serviced By Description of Service Serial Number ...
Page 96: ...94 NOTES ...
Page 97: ...95 NOTES ...