Bradford-White Corp Copper Brute II Hydronic Boiler Manual De Usuario

Page 44

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 

setpoint. The setpoint temperature is set using the 

BOIL TARGET item in the ADJUST menu.

– For “heat demand” to exist, 

there must be continuity between the Com D (common 

demand) and the Ht D (heat demand) terminals. The 
Copper Brute II 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 boiler 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 boilers) and energizes the Pmp Pmp 

terminals. The boiler pump segment is turned on in 

the display. The control then operates the stages to 

maintain the setpoint temperature.

When mode 3 is selected, the control provides 

dedicated domestic hot water operation. 

– 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 ½ 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 boiler pump segment in 

the display. The control then operates the stages to 
maintain the programmed boiler target temperature at 

the boiler outlet sensor. 

The boiler target temperature is set using the 

BOIL TARGET item in the Adjust menu. NOTE: 

External demand is not required in this mode of 

operation.

– A differential setting that 

operates ½ above and below the 

TANK TARGET is 

selectable using the 

TANK DIFF item in the Adjust 

menu.

When either mode 4 or 5 is selected, the control 

uses outdoor reset to control the water temperature. 
Outdoor reset adjusts the target temperature based 

on the outdoor air temperature and reset ratio. The 

reset ratio is determined from the Boiler Start, Boiler 

Design, Outdoor Start and Outdoor Design settings.

– For “heat demand” to exist, 

there must be continuity between the Com D (common 

demand) and the Ht D (heat demand) terminals. The 
Copper Brute II ships with a jumper between these 

terminals. 

The control also evaluates the sensor(s) installed 

in the system. If the control is not in warm weather 

shutdown (WWSD), and the sensor(s) are below the 

target temperature, the Dem segment is turned on 

in the display. The control energizes the pump (on 

pump mounted boilers) and energizes the Pmp-Pmp 
terminals, and the boiler pump segment is turned on 

in the display. The control then operates the stages to 

maintain the setpoint temperature.

BOIL START) – The BOIL 

START temperature is the theoretical boiler supply 
water temperature that the heating system requires 

when the outdoor air temperature equals the OUTDR 

START temperature setting. The BOIL START is 
typically set to the desired building temperature (see 

Figure 30). 

OUTDR START) – The 

OUTDR START temperature is the outdoor air 

temperature at which the control provides the BOIL 

START water temperature to the system. The OUTDR 

START is typically set to the desired building 

temperature.

OUTDR DSGN) – The 

OUTDR DSGN is the outdoor air temperature that is