Bradford White BWCH Operations Instructions download pdf (Page 47)

Page 47

COPPER BRUTE II (500 - 2000)

(b) The ame will go out and blower will

continue to run for the post purge cycle.

One additional attempt to light will follow.

Ignition will not occur as the gas is off. The

ignition control will lockout, and will have

to be reset before the unit will operate.

appliance. The ignition sequence will

start again and the burner will start. The

appliance will return to its previous mode

of operation.

NOTE: Sizes 1000–2000 have two ignition controls

and two ignitors, which work independently of one

another. If the ignition control for stages 1 and 2 fails

to properly light the main burners for those stages, the

second ignition control will still be active, and will be

able to energize stages 3 and 4. This, of course, will

only occur if all other safety devices conrm that the

unit will run in a safe condition.

6.5.2 High Altitude Adjustment and Set Up

Copper Brute II appliances may be operated at

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

output of approx-imately 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 orice 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

adjust-ments are a CO

or O

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 CO

in the “as installed” condition. Adjust the air shutter(s)

so that the CO

is about 8% or the O

is about 6.8% for

appliances operating on Natural Gas. For appliances

operating on LP Gas adjust the air shutter(s) so that the

is about 9.2% or the O

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

or O

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 tting, 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 tting, 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

or O

must be reset. CO

or O

will have changed when the manifold pressure was

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

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

is adjusted to 8.0% for Natural Gas

appliances or 9.2% for LP appliances. When using an

analyzer, the correct O

is 6.8% for both Natural

Gas and LP appliances.

Caution

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.

6.6 Shutting Down the Copper Brute II

1. Switch off the main electrical disconnect switch.

2. Close all manual gas valves.

3. If freezing is anticipated, drain the Copper Brute

II and be sure to also protect building piping

from freezing.

This step to be performed by a qualied

service person.

6.7 To Restart the Copper Brute II

If drained, follow Section 6.1 in this manual for

proper lling and purging.

1. Switch off the main electrical disconnect switch.

2. Close all manual gas valves.

3. WAIT FIVE (5) MINUTES.

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.

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Bradford White BWCH Operations Instructions Page 47

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