Bradford-White Corp BWCV Manual De Usuario

Internet Version for Reference Only

Page 36

Copper Brute II

Page 37

The Copper Brute II series consists of two 2-

stage models (500 and 750), one 3-stage model (1000), 

and four 4-stage models (1250 to 2000). The 2-stage 

models have one ignition module, and the 3- and 

4-stage models have two ignition modules capable of 

independent operation.

A diagnostic panel, that includes test points, as 

well as diagnostic lights, is provided in the control 

module. It is located on the right side of the module, 

behind the display. To access, remove the retaining 

screws from the display cover panel and remove 

it. Grasp the control module at its base and pull it 

outward. Ladder diagrams are shown in Figures 18 

through 20. Voltage test points on the diagnostic 

panel are indicated by solid circles connected by short 

diagonal lines.

Figure 18 shows the diagram for the 2-stage 

models 500 and 750. These have one blower and one 

ignition module. The blower is energized directly 

through the “inducer” terminals F1 and F2 of the 

(Fenwal) ignition module. The 24V power to the 2

nd

 

stage gas valve is routed through the 1

st

 stage VALVE 

terminal, so that stage 2 cannot fire unless the stage 1 

gas valve is open. The 750 differs from the 500 only 

in that the 750 has two gas trains in stage 1, while the 

500 has only one. 

The ladder diagram for the model 1000 is shown 

in Figure 19. Ignition module #1 handles stages 1 and 

2, and ignition module #2 handles stage 3. The single 

blower is energized directly through the “inducer” 

terminals of either ignition module. The 24V power to 

the T’STAT terminal of both ignition modules is routed 

through the safety interlocks.

The ladder diagram for models 1250 to 2000 is 

shown in Figure 20. These 4-stage models have two 

ignition modules, each with its own blower, and each 

controlling 2 stages. The blowers are energized by 

the ignition modules indirectly via switching relays. 

When either ignition module receives a call for heat, it 

switches its blower to high speed and the blower of the 

idle ignition module to low speed.

The wiring schematics for the Copper Brute II 

500 – 1000 are shown in Figure 21, and the schematics 

for the 1250 to 2000 are shown in Figure 22. All 24V 

wiring is routed through the diagnostic PC board. 

Wiring harnesses connect between the diagnostic PC 

board and the control components, indicator board, 

or field wiring terminal strip. The diagnostic board 

contains LEDs that indicate open status of the safety 

interlocks, and quick-connect terminals that provide 

tests points for checking voltage/continuity at various 

points in the control circuit. Line-voltage connections 

are routed via the line-voltage terminal buss.

Certain control elements that may need to be 

re-wired in the field are connected via the field wiring 

terminal strip rather than to the diagnostic PC board. 

These include the low-water cutoff (LWCO), water 

flow switch, and inlet/outlet water temperature sensors.