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BRADFORD WHITE CORP.
light the main burners for that stage, the second ignition
control will still be active, and will be able to energize
stage 2. This, of course, will only occur upon call for
stage 2 and if all other safety devices confirm that the
unit will run in a safe condition.
6.6.2 High Altitude Adjustment and Set Up
Brute Deluxe 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 Brute
Deluxe 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 CO
2
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
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
Brute Deluxe 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 Brute Deluxe 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 Brute Deluxe
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 Brute Deluxe.
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.
9. After placing the appliance in operation, the
Burner Safety Shutoff Device must be tested.
(a) Close gas shutoff valve with burner operating.
(b) The flame 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.
(c) Open gas shutoff valve. Restart the appliance.
The ignition sequence will start again and the
burner will start. The appliance will return to
its previous mode of operation.
NOTE: Unit sizes 1000–2000 have two ignition controls
and two ignitors, which work independently of one
another. If the ignition control for stage 1 fails to properly