D.10.E Temperature Conversion; D.10.F Anti-Frost - Bradford White OmniTech BONH1250 Installation And Operation Instructions Manual
Category ii and iv venting with touchscreen controls
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8.D.10.e Temperature Conversion
To navigate to the Temperature Conversion Configuration Screen, touch the Temperature Conversion Icon on the
Miscellaneous Features screen.
The Temperature Conversion Configuration Screen allows adjustment of the following parameter:
• Conversion unit – This parameter can be set to Fahrenheit or Celsius.
8.D.10.f Anti-Frost
To navigate to the Anti-Frost Configuration Screen, touch the Miscellaneous Features Icon on the Configuration Screen,
then touch the Anti-Frost Icon on the Miscellaneous Features screen.
The Anti-Frost Configuration Screen allows adjustment of the following parameters:
• Anti-Frost – This parameter provides the ability to either disable anti-frost or upon an anti-frost condition, configure the unit
to only turn on the pump or to turn on the pump and fire the burner.
• Set Point – The unit will enter anti-frost mode when the unit's inlet sensor reads the set point minus the hysteresis value. It
will leave anti-frost mode at the set point plus the hysteresis value..
• Hysteresis – This parameter is a +/- offset of the Anti-Frost Set Point used to turn on/off the Anti-Frost mode.
• Pump Control – This parameter provides the ability to select which pump(s) are used in Anti-Frost Mode.
The Set Point parameter is the temperature at the boiler inlet sensor to
which the boiler/heater will apply the Hysteresis value to enable the Anti-
Frost mode.
For example, if the Set Point is 44°F, and the Hysteresis is 4, Anti-Frost
will initiate at 40°F (set point – hysteresis) and then will end at 48°F (set
point + hysteresis). If Pump Only or Pump and Burner mode is selected,
the Pump Control parameter allows configuration of which pump(s) will
run during an anti-frost condition. At least one pump must be selected,
but all three pumps (unit, DHW, or System) can be selected. If Anti-
Frost mode is active, a snow flake icon will appear above the unit inlet
temperature on the home screen. As shown in Figure 38
C O N F I G U R A T I O N
Figure 38. Active Anti Frost Condition
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