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Pressing the Back key will return you to the Heat Source display.
The up and down arrow keys can be used to scroll the cursor up
and down to the various heat sources (boilers or water heaters) at
this location. To the right of each heat source displays the
operational status of the in di vid u al appliance. Pressing the Select
key when the cursor is on a specific heat source displays the
parameters for this boiler or water heater. Pressing the Change
softkey takes you to a screen displaying the six adjustable points
for the boiler or water heater. Use the up and down arrow keys
to move the cursor to each point. Use the + and - softkeys to
adjust the setting pressing Select softkey to enter the revised
setting into memory. Pressing the Back button will return you to
the screen dis play ing the parameters for this Boiler or Water
Heater. Pressing the Back button will return you to screen
displaying the Heat Source(s) and the presence of an Optional
Sequencer, if equipped.
FIG. 57 Command Display Data Screen
OUTDOOR RESET FUNCTION
SELECTIONS
(Optional on Heating Boilers Only)
As an option, the Excel 10 control may be equipped with an outdoor
reset func tion. This function uses a sensor to measure the outdoor
temperature and automatically adjust the boiler set point temperature
to compensate for colder outdoor temperatures. O.A. Min, Max,
SetPoint and Setpoint Temp are changeable points from the Command
Display. The additional values required by the Excel 10 to properly
operate the reset function should be specified at the time a boiler is
ordered. If spe cif ic settings are not available the default values will be
programmed into the Excel 10 at the factory. The op er at ing parameters
for the reset function are:
O.A. Lockout — The maximum outdoor air temperature where the
boiler will con tin ue to operate. When the outdoor temperature rises
above this setting, no heat should be needed for the build ing and the
boiler will lockout and not fire. The default setting if not specified is
70.0°F (21.1°C). This setting should be spec i fied at the time the boiler
is ordered.
O.A. Max — The warmest outdoor air temperature where the boiler
reset function will begin to function and operate the boiler at the initial
set point temperature. The boiler set point will increase based on a
cor re spond ing drop in outdoor temperature below this temperature.
The default setting if not specified is 60.0°F (15.6°C).
O.A. Min — The coldest outdoor air temperature where the boiler
reset function will reach a maximum boiler water temperature (Max.
SetPoint). No additional reset (increase) in boiler temperature will
occur past this point as outdoor temperature continues to drop lower.
The default setting if not specified is 10.0°F (-12.2°C). This setting is
a Changeable Point from the Command Display.
O.A. Temp. — A display of the outdoor air temperature as sensed by
the out door air sensor.
Max. SetPoint — The maximum water tem per a ture that the boiler or
water heat er may be set to operate at. The de fault setting if not
specified is 220.0°F (104.4°C). This setting is a Changeable Point
from the Command Display.
TABLE - V
Status Point Alarm Modes:
Low H2O Flow: Low water or flow condition exists.
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Low Air Press: Low air condition exists.
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Block Drain: Blocked condensate drain exists.
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Block Flue: Blocked flue or louver proving switch failed to prove.
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Gas Press Fail: Low or high gas pressure condition exists.
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Flame Fail: Hard lockout on a flame failure signaled from the ignition control.
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Soft Lockout: Wait period for the ignition control to recover from soft lockout conditions.
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Over Temp: Indicates that a higher than programmed temperature has been reached.