Bradford-White Corp BWCV User Manual

Internet Version for Reference Only

Page 26

Copper Brute II

Page 27

The boiler maximum (BOIL MAX) is the highest 

water temperature that the control is allowed to use 

as a target temperature. If the control does target 

BOIL MAX, and the heater outlet sensor is near the 

BOIL MAX temperature, the MAX segment turns 

on in the LCD while the target, inlet, outlet or supply 

temperature is viewed (see Figure 14).

a set point demand. During WWSD, if the pump has 

not operated at least once every 70 hours, the control 

energizes the terminals for 10 seconds. This minimizes 

the possibility of the pump seizing during a long 

period of inactivity. During External Heater Operation 

(mode 6), the pump contact closes whenever there is a 

heat demand.

Boiler Purge (PUMP DLY) – After a demand 

is satisfied, the control continues to operate the pump 

for a period of time. The length of time that the pump 

continues to run is based on the pump delay setting. 

Once the last stage of the control turns off, the control 

keeps the pump contacts energized for the time 

selected (between 0 and 10 minutes). When OFF is 

selected, there is no purging. When ON is selected, 

pump operation is continuous. Also, during outdoor 

reset, with the pump delay set to ON, the pump 

continues to run even during Warm Weather Shut 

Down.

When either mode 1 or 2 is selected, the control 

controls the water temperature based on a fixed set 

point. The set point temperature is set using the BOIL 

TARGET item in the Adjust menu.

Heat Demand – For “heat demand” to exist, 

there must be continuity between the Com D (common 

demand) and the Ht D (heat demand) terminals. The 

heater ships with a jumper between these terminals.

The control also evaluates the sensor(s) installed 

in the system, including the outlet sensor provided 

on the heater when using mode 1. When the control 

senses continuity between Com D and Ht D terminals, 

and that the sensor reading is below the target 

temperature, the control will activate the Dem segment 

in the display.

The control energizes the pump (on pump 

mounted heater) and energizes the Pmp Pmp terminals. 

The heater pump segment is turned on in the display. 

The control then operates the stages to maintain the set 

point temperature.

When mode 3 is selected, the control provides 

dedicated domestic hot water operation. 

Internal DHW Demand – A sensor is required 

to be connected on the SC2 and Sup/S terminals. 

An internal demand for DHW is generated when the 

temperature demand for DHW sensor drops 1⁄2 of the 

tank differential setting below the desired DHW tank 

temperature. The TANK TARGET setting is used to 

set the desired DHW tank temperature.

Once an internal demand is generated, the 

Dem segment turns on in the LCD. The control then 

closes the Pmp Pmp contact, which starts the pump 

and the control turns on the heater pump segment in 

the display. The control then operates the stages to 

maintain the programmed heater target temperature at 

the heater outlet sensor. 

The target temperature is determined from 

the mode of operation. The control displays the 

temperature that is currently trying to maintain at 

the operating sensor as BOIL TARGET in the View 

menu. The operating sensor for modes 1, 3 and 4 is the 

outlet sensor (on the heater). The operating sensor for 

modes 2 and 5 is the supply sensor (in the system or 

primary loop). If the control does not presently have 

a requirement for heat, it displays “- - -” in the LCD. 

There is no target temperature generated in mode 6 

(external controller mode).

The pump terminals (Pmp Pmp) are energized 

with 24 VAC to control a field supplied pump 

contactor. During set point operation (modes 1 and 2), 

the terminals are energized whenever there is a heat 

demand. During dedicated DHW operation (mode 

3), the terminals are energized whenever there is an 

internal heat demand. During outdoor reset (modes 4 

and 5), the terminals are energized whenever there is 

either a heat demand and the control is not in Warm 

Weather Shut Down (WWSD), or whenever there is