Outdoor Reset - Bradford White OmniTech BONH1250 Installation And Operation Instructions Manual
Category ii and iv venting with touchscreen controls
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8.D.3
Outdoor Reset
Outdoor reset adjusts a boiler's setpoint based on outdoor air temperature. This is for boilers only, and is not
used for domestic water. The Outdoor Parameters Screen allows the adjustment of the following parameters:
• Enable/Disable – Enables and disables the outdoor reset functionality.
• Maximum Outdoor Temperature – The outdoor temperature at which the unit will use the minimum water
temperature as the set point.
• Minimum Outdoor Temperature – The outdoor temperature at which the unit will use the maximum water
temperature as the set point.
• CH1 Minimum Water Temperature – The minimum CH1 boiler outlet temperature based on the Maximum
Outdoor Temperature.
• CH2 Minimum Water Temperature – The minimum CH2 boiler outlet temperature based on the Maximum
Outdoor Temperature.
When there is an active outdoor
reset condition, the set point
will be a calculated value (CSP)
based on the outdoor reset
settings. The example in Figure
30 and Figure 31, shows that the
Outdoor Air Temperature is 42°F.
Based on this, and without a call
for DHW, the set point (CSP)
is 160°F. As the outdoor air
temperature increases, the CSP
decreases.
Figure 30.
Status Window,
Outdoor Reset Example
CH1 and CH2 use the set points on the Parameter
screen as the "Max Hot Water Temp" allowing two
distinct curves based on the demand in use.
C O N F I G U R A T I O N
Figure 31.
Outdoor Reset Example
Page 69
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