Bradford White BWCH Operations Instructions download pdf (Page 25)

Page 25

COPPER BRUTE II (500 - 2000)

Figure 14. Field Wiring Panel Figure 15. External Control Connection Wiring.

with the Copper Brute II is installed in the piping

or tank, per the suggested piping diagrams, and

connected to the “S C2” and “SUP S” terminals. See

Section 6.3 for “Mode” denitions and Figures 22 to

24 for eld wiring schematics.

Outdoor Reset Sensor: The outdoor reset

sensor, if used, is connected to the “OD S” and “S C2”

terminals.

Field Installed Pump: A pump contactor can

be wired to the “PMP” and “PMP” terminals (these

terminals supply 24VAC to close the contactor

whenever the boiler pump would be operated).

NOTE: In some cases, the boiler pump is operated

continuously.

External Alarm: An external power supply and

alarm can be connected to the “ALRM” and “ALRM”

terminals. In the event of an ignition system lockout, a

contact closure occurs across these terminals.

External Heat Demand Indication: 24VAC

is present across the “HT OUT” and “LWCO GND”

terminals whenever the temperature control sees a

system heat demand. This can be used to power a

contactor (0.5 Amp, maximum) for devices operated

whenever the boiler could re (combustion air fans,

motorized louvers, etc.) NOTE: In some cases, the

temperature control will always see a heat demand

in the system, such as when the “Ht D” and Com D”

terminals are jumpered.

Other Field Interlocks: To install other eld-

wired devices to interlock with the boiler (louver

switches, ow switches, etc.), remove the jumper

between the “COM” and “NO” terminals and wire the

device in series across these terminals. (See Section

5.3 for important information about external staging

controls and building automation systems.)

System Heat Demand: Remove the jumper

across the “COM D” and “Ht D” terminals, and con-

nect the zone pump or valve end switch, thermostat,

aquastat, or other indication of system heat demand

to these terminals. If no indication of a system heat

demand will be provided, the jumper must remain in

place. When jumpered, the temperature control will

always see a heat demand, and the Copper Brute II

pump (if equipped) or any pump with its contactor

connected to the “PMP” and “PMP” terminals will

run continuously. In addition, any device connected

through the “HT OUT” and “LWCO GND” terminals

for an external indication of the heat demand will

run continuously. See Section 6 for more information

on the system heat demand for various modes of

operation.

Refer to Figures 22 through 24 for eld wiring of

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Bradford White BWCH Operations Instructions Page 25

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