Bradford-White Corp Copper Brute II Hydronic Boiler 用户手册

Page 42

For most installations, 

Section 6.3

 provides 

all the information required to set up the Copper Brute 

II boiler, and this section should be skipped. Continue 
setup in 

Section 6.5.

This section provides definitions of the pro-

gramming parameters, advanced programming topics, 

and other information that may be of interest.

Advanced programming mode allows the 

installer to set the temperature control for proportional 

staging. In advanced programming mode, the 
interstage differential, interstage delay, interstage on 
and off delay, and minimum time on and off are all set 

manually.

 Advanced programming mode is not required 

in most applications, and is intended for advanced 

installers only. 

To enter advanced programming mode, remove 

the bezel on the temperature control by pulling out at 

the bottom. Remove the small phillips head screw to 

access the dip switch. The dip switch is mounted on 

a circuit board. Locate the letter “A” on the circuit 
board and slide the corresponding dip switch toward 

the letter “A”. The default setting of this dip switch is 
toward the 

OFF

 lettering on the circuit board.

Differential has an abbreviated name of DIFF. An 

on/off heat source must be operated with a differential 

in order to prevent short cycling. The differential 
is divided around the boiler target temperature (see 

Figure 28

). The first stage contact will close when the 

water temperature at the operating sensor is one-half of 

the differential setting below the target temperature. It 
will open when the water temperature at the operating 
sensor is one-half of the differential setting above the 

target temperature. The remaining stages will operate 

sequentially, based on the staging mode selected.

The Copper Brute II 500 and 750 control 

operates two stages. The Copper Brute II 1000 control 

operates three stages. The Copper Brute II control for 

models 1250–2000 operates four stages. The method 

of staging used by the control is either P (proportional) 

or PID (proportional & integral & derivative), and is 
selected using the 

STGMODE item in the ADJUST 

menu.

Proportional (P) 

– Proportional staging, also 

known as step staging, is based on manually adjusted 

settings which determine when the next stage is 

required to turn on. These manual settings are based 

on temperature and time. The interstage differential 

sets the temperature drop at which the next stage turns 

on. However, in order for a stage to fire, the interstage 

delay on and minimum off times must first elapse.

STG DIFF) – The 

interstage differential is the temperature drop at which 

the next stage will turn on. Once a stage turns on, the 

next stage cannot turn on until the temperature drops 
the interstage differential below the temperature at 

which the previous stage turned on. The interstage 
differential is adjustable through the 

STG DIFF 

setting in the 

Adjust menu (see 

Figure 28

).

ON DLY) – The interstage 

delay on is the amount of time that must elapse before 

turning on the next stage. Once a stage turns on, the 

next stage cannot turn on until the interstage delay 

on time elapses. The interstage delay on is adjustable 
through the 

ON DLY setting in the Adjust menu.

OFF DLY) – The 

interstage delay off is the amount of time that must 

elapse before turning off the next stage. Once a stage 

turns off, the next stage cannot turn off until the 

interstage delay off time elapses. The interstage delay 
off is adjustable through the 

OFF DLY setting in the 

Adjust menu.

MIN ON) – The minimum 

on time is the minimum amount time that a stage must 

be on before it is allowed to turn off. Once a stage 
turns on, it cannot turn off until a minimum on time 

elapses. The minimum on time is adjustable through 
the 

MIN ON setting in the Adjust menu.

MIN OFF) – The 

minimum off time is the minimum amount time that a 

stage must be off before it is allowed to turn on. Once 
a stage turns off, it cannot turn on until a minimum 

off time elapses. The minimum off time is adjustable 
through the 

MIN OFF setting in the Adjust menu.

Proportional & Integral & Derivative (PID) 

– PID staging allows the control to determine when 

the next stage is required to turn on. The control 
automatically determines the settings that are manually 

selected in proportional staging mode. After each stage 

is turned on in the firing sequence, the control waits a