43
BOILER CONTROL: OPERATION
d. Installation Location & Vent Material: Due to
differing national codes in the United States and
Canada, there are different material requirements
for exhaust vent pipe. Therefore, the maximum
vent limit temperature is different depending on
the material used.
Screens #3 and #4 allow the installer to select
the installation location and vent material. Based
on the information given, Table 8.8 shows the
exhaust temperature that the control will allow
before reducing the burner input rate. If the
temperature of the exhaust gas approaches these
values, the control will reduce the input rate on
both burners until the temperature begins to
drop. If the flue temperature continues to rise, the
control will shut down both burners.
Note: Although stainless steel can withstand
a temperature higher than 230°F (110°C) the
temperature limit is set to this temperature since
the vent temperature should not exceed this
temperature unless there is a problem with the
heat exchanger.
e. Freeze Protection: Freeze protection is intended to
prevent freezing the central heating system.
•
First, the control activates pumps to distribute
heat uniformly through the system.
– If the boiler supply (header) temperature
drops below the value selected for “Freeze
Protection starts at:”, the General (boiler)
circulator is activated.
– If either of the boiler return sensors reports
a value below this temperature, the CH
circulator is started.
•
Next, if Burner M return temperature drops
more than 9°F (5°C) below the “Freeze
Protection starts at:” value, the control activates
Burner M (managing burner) at it minimum rate.
– If a central heat demand is detected while the
burner is operating for Freeze Protection, the
burner will run normally to satisfy the demand.
– Finally, once the return temperature increases
to 9°F (5°C) above the chosen value, the
burner is switched off and the pumps are
deactivated.
f. Blower Postpurge Time: The blower postpurge
time can be increased to address problems under
extreme conditions (long exhaust vent runs, high
winds, etc.) where the products of combustion are
not fully expelled from the venting system. This
feature should be used sparingly as it may lead to
decreased efficiency and higher fuel bills in certain
situations.
g. Additional Safety Functions: This feature allows
the installer to choose between using a low water
cut-off or a flow switch to assure proper water
circulation and operation of the boiler. Either of
these devices should be wired to terminals 11
& 12 (Safety Interlocks) of the
P
ure
F
ire
®
boiler.
Note that these terminals are connected internally
to the high & low gas pressure switches so that a
“Safety Interlock Open” error may occur due to
high or low gas pressure in addition to anything
connected to these terminals.
Table 8.8: Vent Temperature Limits
Vent Material
Location
U.S.A.
Canada
PVC
190°F
(80°C)
149°F
(65°C)
CPVC
230°F
(110°C)
190°F
(80°C)
Polypropylene
(PPs)
230°F
(110°C)
230°F
(110°C)
Stainless Steel
230°F
(110°C)
230°F
(110°C)
Table 8.10: Freeze Protection Range & Default
Freeze Protection
Starts at
Default
Minimum
Maximum
50°F (10°C)
45°F (7°C)
56°F (13°C)
Figure 8.24: Burner Settings – Blower Post Purge
Table 8.11: Blower Post Purge Range & Default
Blower Post
Purge Time
Default
Minimum
Maximum
30 sec
30 sec
120 sec
Figure 8.23: Burner Settings – Freeze Protection
Table 8.9: Location & Vent Material Default
Parameter
Default
Location
U.S.A.
Vent Material
PVC
Figure 8.22: Burner Settings – Location & Vent
Material
Table 8.7: Boiler Address
Boiler Address
Value
Description
0
Stand-Alone Boiler
1
Master Boiler in a Cascade System
2-16
Dependent Boilers in a Cascade System
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 ...