Bradford White BWCH Operations Instructions download pdf (Page 52)

Page 52

BRADFORD WHITE CORP.

8.6 Troubleshooting the Temperature

Control

See Table 12.

8.7 Troubleshooting Copper Brute II

Controls

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

stage VALVE terminal, so that

stage 2 cannot re 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 eld

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 eld are connected via the eld wiring

terminal strip rather than to the diagnostic PC board.

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

ow switch, and inlet/outlet water temperature sensors.

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