53
8.
Sequence (Managing Burner Display Only)
Adjustments in the sequence menu affect the
sequence of burner operation. The first six parameters
will stop and start burners as follows:
a. On a call for heat (either CH or DHW) the 1st
burner will start. The 1st burner can be either
the managing or dependent burner based on the
Rotation Interval
chosen.
b. After the 1st burner is activated, the 2nd burner will
come on if all three of the following conditions are
met:
i. Supply Temperature < Target Temperature –
Start Burner Differential
ii. 1st Burner Input Rate >
Next Burner Start
Rate
iii.
Start Delay Time
has elapsed (Time from
when both prior parameters are met)
c. The 2nd burner will be deactivated if the following
conditions are met:
i. Supply Temperature > Target Tempe
Stop Burner Differential
ii. Both Burner Input Rates <
Next Burner
Stop Rate
iii.
Stop Delay Time
has elapsed (Time from
when both prior parameters are met)
d. Calculated Setpoint Max Offset Up/Down: The
target supply temperature of both burners are
adjusted if the system supply temperature is above
or below the targeted value. For example, if the
system supply target temperature is 150°F, each
burner will target this temperature. However, if
they approach their individual target temperature
before the system supply approaches its target,
a temperature offset is applied. This offset is
calculated based on the
Calculated Setpoint
Max
offset up. Similarly, if the system target is
above its target a calculated negative offset based
on the
Calculated Setpoint Max offset down
is applied. The maximum increased setpoint
temperature is 195°F (91°C).
E. DEFAULTS
1.
Factory Defaults – Restore:
By pressing the
“Select” key while in the “Factory Defaults” screen.
All factory settings will be restored on the control.
2.
Site Defaults – Save:
To save the current settings
as “Site Defaults,” press the “Select” key while in the
following menu.
3.
Site Defaults – Reset:
To restore the “Site
Defaults,” press the “Select” key while in the following
menu.F: MULTIPLE BOILERS
F. MULTIPLE BOILERS
1.
Multiple Boiler Wiring:
Two methods for
connecting the master boiler to the dependent boilers
are allowed.
a. Figure 8.53 shows a daisy chain configuration.
This method is convenient but can lead to more
than one boiler shutting down in the case of an
open circuit.
b. Figure 8.54 shows the master boiler connected
to each dependent boiler. This method creates
independent connections to each dependent
boiler.
c. Each boiler controls its own “General” pump that
operates any time that boiler is operating. It is
extremely important to have water flow through
the boiler during burner operation.
d. All external inputs (Outdoor Temperature Sensor,
DHW Tank Temperature Sensor and System
Sensor must be connected to the master boiler.
e. The domestic hot water (DHW) circulating pump
should be connected to the master boiler.
f. The central heating (CH) circulating pump(s)
should be connected to the master boiler if they
are intended to be controlled by the boiler system.
2.
Multiple Boiler Address & Menu Options:
In
order to operate multiple boilers in cascade, a unique
address must be assigned to each of the dependent
boilers.
a. To access the cascade menu:
i. Remove the grey plastic front panel of the
boiler to get full access to the Pixel display
module.
ii. Open the lower cover on the display to expose
the extended menu keys.
iii. Press and hold the “ ” key for 5 seconds and
release: The boiler
address selection will be displayed. This is the
only menu option unless the boiler is
configured as the master boiler with a boiler
address of “1”.
iv. Use the “
t
” and “
s
” key to scroll through the
option list. The bullet “
l
” will appear to the
left of the option.
v. Pressing the “OK” key selects the parameter
to change. The bullet “
l
” on the screen will
appear between the option name and its
value.
vi. Use the “
t
” and “
s
” key to change the value
and press “OK” to update.
vii. Pressing the “MENU” key on the pixel display
will return to the standard display screen.
BOILER CONTROL: OPERATION
Figure 8.50: Restore Factory Defaults Screen
Figure 8.51: Save Site Defaults Screen
Figure 8.52: Restore Site Defaults Screen
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 ...