Bradford-White Corp BWCV Manual De Usuario

Internet Version for Reference Only

Page 30

Copper Brute II

Page 31

Copper Brute II appliances may be operated at 

high altitude (7700 ft., 2347 m) with a reduction in 

output of approximately 10%. At altitudes of less than 

or more than 7700 ft. (2347 m) the appliance will 

perform equally as well, but with differing reductions 

in output. At elevations higher than 7700 ft. (2347 

m) the reduction in output will exceed 10% and at 

elevations below 7700 ft. (2347 m) it will be less than 

10%. High altitude adjustment must not be made on 

appliances operating at elevations below 2500 ft. (762 

m).

No orifice changes are required to adjust the 

Copper Brute II appliances for high altitude. High 

altitude adjustment is accomplished by adjustment of 

the gas valve manifold pressure and the air shutter(s). 

The required instruments used to assist in these 

adjustments are a CO

2

 or O

2

 Analyzer and a U-Tube 

Manometer or other device capable of reading a 

pressure of 2.5-3.0 inches W.C. (0.62-0.75 kPa).

Start the adjustment process by checking the 

CO2 in the “as installed” condition. Adjust the air 

shutter(s) so that the CO

2

 is about 8% or the O

2

 is 

about 6.8% for appliances operating on Natural Gas. 

For appliances operating on LP Gas adjust the air 

shutter(s) so that the CO

2

 is about 9.2% or the O

2

 is 

about 6.8%. Appliances with two blowers should be 

adjusted so that the air shutters below each blower are 

open the same amount.

Once the CO

2

 or O

2

 has been set, the manifold 

pressure may be adjusted. Remove the 1/8 NPT plug 

from the lower side of the gas valve that is to be set 

and install a fitting, hose and manometer. Start the 

appliance and observe the manifold pressure. Manifold 

pressure must be adjusted to 3.0 in. W.C. (0.75 kPa) 

(for high altitude only, standard operating pressure is 

2.5 in. W.C. (0.62 kPa)). It is adjusted by removing the 

slotted cap on the gas valve and turning the adjustment 

screw (beneath the cap) clockwise to increase 

pressure and replaced after the adjustments have been 

completed and the fitting, hose and manometer have 

been removed and the 1/8" plug has been replaced. 

Repeat this process until all gas valves have been set. 

Note: The pressure can be set only when the appliance 

is operating and only when the particular gas valve 

being adjusted is energized by a call for heat from the 

staging control.

After all of the gas valve manifold pressures 

have been set, the CO

2

 or O

2

 must be reset. CO

2

 or O

2

 

will have changed when the manifold pressure was 

adjusted. Open the air shutter(s) to reduce the CO

2

 or 

O

2

 to the values achieved previously.

The procedure is complete when all gas valves 

are adjusted to a manifold pressure of 3.0 in. W.C. 

(0.75 kPa) and the CO

2

 is adjusted to 8.0% for Natural 

Gas appliances or 9.2% for LP appliances. When using 

an O

2

 analyzer, the correct O

2

 is 6.8% for both Natural 

Gas and LP appliances.

Should any odor of gas be detected, or if the gas 

burner does not appear to be functioning in a 

normal manner, close main shutoff valve, do not 

shut off switch, and contact your heating contractor, 

gas company, or factory representative.

1.      Switch off the main electrical disconnect switch.

2.      Close all manual gas valves.

3.      If freezing is anticipated, drain the heater and be 

sure to also protect building piping from freezing.

         This step to be performed by a qualified 

If drained, follow Section 6.1 in this manual for 

proper filling and purging.

1.      Switch off the main electrical disconnect switch.

2.      Close all manual gas valves.

4.      Set the aquastat or thermostat to its lowest 

setting.

5.      Open all manual gas valves.

6.      Reset all safety switches (pressure switch, 

manual reset high limit, etc.).

7.      Set the temperature controller to the desired 

temperature setting and switch on electrical 

power.

8.      Burner will go through a prepurge period and 

ignitor warm-up period, followed by ignition.

1.      Lubricate the system water-circulating pump, if 

required, per the instructions on the pump. 

2.      If a strainer is employed in a pressure reducing 

valve or the piping, clean it every six months.

3.      Inspect the venting system for obstruction or 

leakage at least once a year. Periodically clean 

the screens in the vent terminal and combustion 

air terminal (when used).

4.      Keep the appliance area clear and free from 

combustible materials, gasoline, and other 

flammable vapors and liquids.

5.      If the appliance is not going to be used for 

extended periods in locations where freezing 

normally occurs, it should be isolated from the 

system and completely drained of all water. All 

systems connected to it should also be drained or 

protected from freezing.