Common Vent Test; Gas Supply And Piping - Bradford White Brute BNTH Installation And Operation Instructions Manual

Brute
BOILERS AND VOLUME WATER HEATERS

3.4 Common Vent Test

NOTE: This section does not describe a method for
common venting Brute units. It describes what must be
done when a unit is removed from a common vent system.
Brute units require special vent systems and fans for
common vent. Contact the factory if you have questions
about common venting Brute units.
When an existing boiler is removed from a common venting
system, the common venting system is likely to be too large
for proper venting of the appliances remaining connected
to it.
At the time of removal of an existing boiler, the following
steps shall be followed with each appliance remaining
connected to the common venting system placed in
operation, while the other appliances remaining connected
to the common venting system are not in operation.
1. Seal any unused openings in the common venting
system.
2. Visually inspect the venting system for proper size and
horizontal pitch and determine there is no blockage or
restriction, leakage, corrosion and other deficiencies
which could cause an unsafe condition.
3. Insofar as it is practical, close all building doors and
windows and all doors between the space in which
the appliances remaining connected to the common
venting system are located and other spaces of the
building. Turn on clothes dryers and any appliance not
connected to the common venting system. Turn on
any exhaust fans, such as range hoods and bathroom
exhausts, so they will operate at maximum speed. Do
not operate a summer exhaust fan. Close fireplace
dampers.
4. Place in operation the appliance being inspected.
Follow the lighting instructions. Adjust the thermostat so
the appliance will operate continuously.
5. Test for spillage at the draft hood relief opening after
5 minutes of main burner operation. Use the flame of
a match or candle, or smoke from a cigarette, cigar or
pipe.
6. After it has been determined that each appliance
remaining connected to the common venting system
properly vents when tested as outlined above, return
doors, windows, exhaust fans, fireplace dampers and
any other gas burning appliance to their previous
conditions of use.
7. Any improper operation of the common venting system
should be corrected so that the installation conforms
to the National Fuel Gas Code, ANSI Z223.1/NFPA 54
and/or CSA B149.1, Installation Codes. When resizing
any portion of the common venting system, the com-
mon venting system should be resized to approach
the minimum size as determined using the appropriate
tables and guidelines in the National Fuel Gas Code,
ANSI Z223.1 NFPA 54 and/or CSA B149.1, Installation
Codes.
Section 4 -

GAS SUPPLY AND PIPING

Gas piping should be supported by suitable hangers or
floor stands, not the appliance.
Review the following instructions before proceeding with
the installation.
1. Verify that the appliance is fitted for the proper
type of gas by checking the rating plate. Brute will
function properly without the use of high altitude
modification at elevations up to 10,000 feet (3050
m).
2. The maximum inlet gas pressure must not
exceed 13" W.C. (3.2kPa). The minimum inlet gas
pressure is 4" W.C. (1.0kPa).
3. Refer to Tables 6a, 6b, 6c and 6d to size the
piping.
4. Run gas supply line in accordance with all
applicable codes.
5. Locate and install manual shutoff valves in
accordance with state and local requirements.
6. A sediment trap must be provided upstream of the
gas controls.
7. All threaded joints should be coated with piping
compound resistant to action of liquefied petroleum
gas.
8. The appliance and its individual shutoff valve
must be disconnected from the gas supply piping
during any pressure testing of that system at test
pressures in excess of 1/2 PSIG (3.45kPa).
9. The unit must be isolated from the gas supply
system by closing its individual manual shutoff
valve during any pressure testing of the gas supply
piping system at test pressures equal to or less
than 1/2 PSIG (3.45kPa).
10. The appliance and its gas connection must be leak
tested before placing it in operation.
11. Purge all air from gas lines.
Open flame can cause gas to ignite and result in
property damage, severe injury, or loss of life.
NOTE: The Brute appliance and all other gas appliances
sharing the gas supply line must be firing at maximum
capacity to properly measure the inlet supply pressure.
The pressure can be measured at the supply pressure
port on the gas valve. Low gas pressure could be an
indication of an undersized gas meter, undersized gas
supply lines and/or an obstructed gas supply line. Some
Brute units are equipped with low and high gas pressure
switches that are integrally vent limited. These types of
devices do not require venting to atmosphere.
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WARNING: