Bradford-White Corp BWCH Manual De Usuario

Page 46

The control then operates the boiler stages to maintain 

the programmed boiler target temperature. The reset 

override operation is not affected by WWSD.

When mode 6 is selected, the control allows for 

an external control to operate the Copper Brute II’s 

stages. In this mode, the control operates the pump in 

order to provide purging and exercising. The staging 

operation is provided by an external device such as 

an Energy Management System (EMS) or External 

Staging Control.

– A heat demand is generated 

when stage one is wired properly, and the external 
control closes the contacts on the stage one terminals 

(1C-1NO), calling the Copper Brute II for heat. The 
Copper Brute II is shipped with a jumper between 

the Com D and Ht D terminals, and this jumper must 

remain in place when and external control is providing 

the heat demand signal to these terminals. The control 
energizes the boiler pump (if equipped), energizes 

the Pmp-Pmp terminals, and turns on the boiler pump 

segment in the display. The control also turns on 

stage 1 of the boiler. 

Section 5.3

 contains important 

information about external staging controls and 

building automation systems. Other wiring methods 
may be unsafe. The wiring in 

6.4.11 Limit Controls
In addition to the temperature control, Copper 

Brute II appliances are fitted with a manual reset 

high limit and an automatic reset high limit. These 
are located near the rear of the cabinet on the right 
side, behind the slide out drawer (see 

Figure 32

). 

Both controls should be set at least 25°F higher than 

the target temperature to avoid short cycling. To set 
these controls, remove the control panel cover and 

pull the control panel out to gain access. Appliances 

with reversed heat exchangers have the limit controls 

relocated to the left side of the appliance. The left 
access door must be removed to gain access to the 

limit controls on these appliances.

6.4.12 Advanced Programming Mode
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 rarely 

required. It is intended for advanced installers, 

and only when the application demands such 

programming.

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.

6.5.1  Set Up for 0 to 2500 Feet Altitude
The Copper Brute II appliance utilizes a modular 

design to achieve its stage-firing. The setup must be 

checked before the unit is put in operation. Problems 

such as failure to start, rough ignition, strong exhaust 

odors, etc. can be due to improper setup. Damage to 
the Copper Brute II resulting from improper setup is 

not covered by the limited warranty.

1.  Using this manual, make sure the installation 

is complete and fully in compliance with the 

instructions.

2.  Determine that the appliance and system are 

filled with water and all air has been bled from 

both. Open all valves.

3.  Observe all warnings on the Operating 

Instructions label and turn on gas and electrical 

power to appliance.

4.  Switch on the appliance power switch located on 

the right side of the unit.

5.  The Copper Brute II will enter the start sequence, 

as long as the unit is being called for heat. The 
blower and pump come on for pre-purge, then 
the ignitor warm-up sequence starts and after 
the ignitor warm-up is complete and all safety 

devices are verified, the gas valves open. If 
ignition doesn’t occur, check that there is proper 

gas supply. Wait 5 minutes and start the unit 

again. During initial start up, air in the gas line 

may cause the Copper Brute II to "lock out" 

during the first few trials for ignition. Depending 
on the ignition modules installed, the manual 
reset button on the ignition modules may need to 

be depressed to restart the Copper Brute II.

6.  When the unit is running, the supply gas pressure 

must be checked. Inlet gas pressure must not 

exceed 13" w.c. (3.2kPa). The minimum inlet gas 

pressure is 5" w.c. (1.2kPa).

7.  Once the inlet gas pressure is verified, the 

outlet gas pressure from each valve (manifold 
gas pressure) must be checked, and adjusted, if 

necessary. The manifold gas pressure must be 

2.5" w.c. (0.62kPa).

8.  Complete the setup by checking the CO

2

 at the 

outlet of the unit. The CO

2

 should be 8% for 

natural gas, or 9.2% for propane.

. 

To test: 

 

(a)  Close gas shutoff valve with burner 

operating.