Bradford-White Corp BRHHV Mixing System and Control, Control Parameter Possible Interference

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Figure 16. Control Parameter Possible Interference.

changed. This setting will be the best suited to most Brute Magnum installations.

Fast: Switch 4 to ON position and all others to OFF. If the rate of system recovery to setpoint is sluggish with the control set to medium, the “Fast” setting may be an improvement. The “Fast” setting will only be used when the rate of change at the sensor is very rapid. In most cases, this setting is too fast for the Brute Magnum.

5.6Mixing System and Control

The Brute Magnum has an internal mixing

system that ensures that the condensation does not occur on the finned copper heat exchanger, with boiler return temperature down to 70°F (21°C). This

system, that consists of automatically actuated and linked valves, is set up at the factory, and is non-adjustable. The return water goes through the stainless steel heat exchanger, then to the mixing system (see Figure 7).

If the water at the inlet of the copper heat

exchanger is less than 140°F (60°C), water from the outlet of the copper heat exchanger will be directed back to the inlet of the copper heat exchanger, and will mix to bring the inlet water up to 140°F (60°C). Once through the copper heat exchanger, the water picks up

another 20-25°F (11-14°C) (when at high fire), and it leaves the boiler at 160-165°F (71-74°C). This hot water is then sent to the system.

If the water at the inlet of the copper heat exchanger is 140°F (60°C), or higher, the water will be allowed to flow through the copper heat exchanger and directly to the outlet of the Brute Magnum, and there will be a 20-25°F (11-14°C) temperature rise between the inlet and outlet of the unit, when the unit is at high fire.

The by-pass mixing control displays the mixed water temperature, which is the temperature of the water that is sent to the copper heat exchanger. This temperature setting is locked and cannot be changed in the field.

By pressing and holding the two buttons on the left of the mixing control for at least 3 seconds, the user will access two available menus.

The first menu allows selection of the temperature units. Pressing the two left buttons for at least 3 seconds displays “Uni” on the screen (for units). Then “°F” is displayed. Press the up or down arrow on the control to change from °F to °C, or °C to °F. When the preferred selection is displayed, press the enter (bottom left) button. The control will then display “Add” for the second menu. If no more buttons are pushed, the control will automatically return to the temperature display mode.