Bradford-White Corp Copper Brute II Hydronic Boiler Manual De Usuario

Page 52

See 

Table 12.

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 16 

through 18.

 Voltage test points on the diagnostic 

panel are indicated by solid circles connected by short 

diagonal lines.

Figure 16

 shows the diagram for the 2-stage sizes 

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 2nd 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 size 1000 is shown 

in 

Figure 17.

 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 sizes 1250 to 2000 is 

shown in 

Figure 18.

 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 19,

 the schematics for 

the 1250–1500 are shown in 

Figure 20, 

and

 Figure 21 

shows the schematic for 1750–2000.  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.