Bradford-White Corp BWCV warranty Internet Version for Reference Only, Bradford White

Internet Version for Reference Only

Page 22 Bradford White

Figure 10. Temperature Control.

Figure 12. Temperature Control Target Temperature Graph.

BOIL MIN (Boiler Minimum Temperature): This setting tells the Temperature Control to maintain at least this temperature, even if the PID logic determines a lower setting would save energy. The BOIL MIN should always be 120°F (49°C) or higher to prevent condensation, and can be set up to 10°F below your BOIL TARGET temperature. See section

6.3.3for more information.

BOIL MAX (Boiler Maximum Temperature):

This setting tells the Temperature Control to limit the maximum outlet temperature to this setting or below, and determines how quickly the temperature control “stages down” or off. If the BOIL MAX setting is much higher than the BOIL TARGET temperature, the temperature control will fire all stages until the target temperature is reached, and then shut down all stages at once. To enable gradual staging down of the heater as you approach your target temperature, set the BOIL MAX to the same setting as the target temperature. See section 6.3.4 for more information.

DIFF (Differential): This setting is divided above and below the target temperature. The water will be allowed to cool 1⁄2 this setting below the target temperature before first stage fires, and will heat to 1⁄2 this setting above the target temperature before staging the heater down. See Section 6.3.1 and Figures 12 and 13 for more information.

Figure 11. Temperature Control Symbol Description.

The first item is “Mode”; enter the mode number as determined above. The Temperature Control will then present you with some or all of the following options, depending on the mode you have chosen:

In mode 6, external heater control, you will not see the following options. Refer to manual, section 6.3.10, for setup information for mode 6.

FOR ALL OTHER MODES:

BOIL MASS (Boiler Mass): Always choose “1”. BOIL TARGET (Boiler Target Temperature):

Your desired set-point temperature. See section 6.3.5 and Figure 12 for more information.

Figure 13. Temperature Control Interstage Differential Graph.