Bradford-White Corp Water Heater BWCH Manual De Usuario

Page 40

Mode 2 is used in primary-secondary 

piping hydronic systems without outdoor reset. Mode 

5 adds outdoor reset.

Step 1: Install the additional sensor in the 

primary loop (see 

Figure 4

), and wired to the “SC2” 

and “SUPS” terminals on the field wiring panel 

(Figure 23).

Remove the factory-installed jumper 

between the “HtD” and “ComD” terminals on the 

field wiring panel (

Figure 14

), and connect a zone 

valve or pump end switch or other contact closure 

device (aquastat, etc.) to these terminals to provide an 

indication of heat demand in the system. 

Note: The boiler must have an indication of heat 

demand to fire. If a zone valve or pump end switch is 
not connected to the “HtD” and “ComD” terminals, the 

jumper must be left in place. However, the boiler pump 

(if equipped) and any pump connected to a contactor 

wired to the PMP-PMP terminals on the field wiring 

panel will run continuously and not cycle off according 

to the setting for the Pump Delay. In addition, the LCD 

screen will always show “dem” (demand) and will not 

allow cycling of the display to verify all the sensor 

settings.

Press the three programming buttons 

to enter 

ADJUST mode (

Figure 25

). Press Item to 

select the programming item, and the 

 keys 

to adjust the setting. See 

Section 6.3 Programming 

 if more programming 

instructions are needed.

MODE 

2 

BOIL TARGET 

180 

BOIL MASS 

1 

DIFF 20 

DLY 

5:00 

F° 

F° 

See 

Section 6.4.11 Limit Controls.

 Set 

both high limit controls at least 25°F / 14°C higher 
than the 

BOIL TARGET to allow for temperature rise 

across the heat exchanger.

This section describes various applications and 

the recommended field wiring and Mode selections.

This setup is most commonly found in domestic 

hot water applications with a continuous run pump. 

This is not recommended for other applications.

The Copper Brute II is shipped with a jumper 

between the “Com D” and “Ht D” terminals, which 

must remain in place to allow the unit to fire. The unit 

will fire whenever the outlet temperature cools below 

the target temperature.

Important Note: If the Copper Brute II is pump-

mounted at the factory, or if a field-supplied pump 

contractor is connected to the Copper Brute II’s pump 
contactors 

(Pmp Pmp), the user must program the controller’s 

pump delay (DLY) setting to ON. When ON is selected, 

pump operation is continuous. The unit’s inlet and 
outlet sensors must be able to detect the temperature 

in the storage tank in order to control it. Without the 

tank water continuously running through the heater, 

the heater will have no way of knowing what the 

temperature in the tank is, and will not be able to 

respond to a change in tank temperature. Short cycling 

or lack of hot water may result if the pump does not 

run continuously.

Remove the jumper from the “Com D” and 

“HtD” terminals and connect the aquastat’s leads to 

these terminals. This connection uses a standard, non-

powered mechanical aquastat. When the aquastat calls 
for heat, the Copper Brute II’s temperature control will 
respond and start the boiler pump (if equipped) and 

fire the boiler.

If the Copper Brute II is not a pump mounted 

model, a 24VAC pump contactor may be connected to 

the “PMP” terminals to control a field installed pump. 
(If desired, the pump can run continuously, with the 

aquastat telling the heater when to fire.)

Program the temperature control to use Mode 1. 

The 

AUTO/MAN

 switch must be in the 

AUTO

 position in 

this mode.

The Copper Brute II ships with a jumper between 

the “Com D” and “Ht D” terminals. Verify this jumper 

is in place, and connect the sensor leads to the “S C2” 

and “SUP S” terminals. When the sensor detects a 
temperature below the target temperature, the control 
will respond and start the heater pump (if equipped) 

and fire the heater. 

If the heater is not a pump mounted model, a 

24VAC pump contactor may be connected to the 

“PMP” terminals to control a field installed pump. (If 

desired, the pump can run continuously).

Program the temperature control to use Mode 3. 

The 

AUTO/MAN

 switch must be in the 

AUTO

 position in 

this mode.