Bradford-White Corp BWCH Manual De Usuario

Page 25

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” definitions and 

Figures 22 to 

24

 for field 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.

: 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.

: 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 fire (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.

: To install other field-

wired devices to interlock with the boiler (louver 

switches, flow 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.)

: 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 field wiring of