Removal Of Existing Furnaces From Common Vent Systems; Combustion Air And Vent Pipe Systems - Bryant 355BAV Installation, Start-Up, And Operating Instructions Manual

CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit component
damage.
DO NOT connect furnace control HUM terminal to HUM
(humidifier) terminal on Thermidistatt, Zone Controller or
similar device. See Thermidistatt, Zone Controller,
thermostat, or controller manufacturer's instructions for
proper connection.
2. Humidifier (HUM)
Connect an accessory 24 VAC, 0.5 amp maximum humidi-
fier (if used) to the 1/4- -in. male quick- -connect HUM ter-
minal and COM- -24V screw terminal on the control board
thermostat strip. The HUM terminal is energized when
blower is energized in heating. (See Fig. 23 and 33.)
Removal of Existing Furnaces from Common Vent
Systems
When an existing Category I furnace is removed or replaced, the
original venting system may no longer be sized to properly vent
the remaining attached appliances. An improperly sized Category I
venting system could cause the formation of condensate in the
furnace and vent, leakage of condensate and combustion products,
spillage of combustion products into the living space, etc.

Combustion Air and Vent Pipe Systems

General
Vent system or vent connectors of other appliances may need to be
resized. For any other appliances when resizing vent systems or
vent connectors, system or connector must be sized to approach
minimum size as determined using appropriate table found in the
NFGC or NSCNGPIC.
The 355BAV can be vented as either a direct vent furnace or as an
optional ventilated combustion air application. A direct vent
system shall be installed in accordance with the direct vent
(2- -pipe) procedures in the following Combustion Air and Vent
Pipe Systems section. For optional ventilated combustion air
applications, refer to the ventilated combustion air option
procedures in the same section. Common venting prohibited.
Direct Vent / 2- - Pipe System
In a direct- -vent (2- -pipe) system, all air for combustion is taken
directly from outdoor atmosphere, and all flue products are
discharged to outdoor atmosphere. Combustion- -air and vent pipes
must terminate together in the same atmospheric pressure zone,
either through the roof or a sidewall (roof termination preferred).
A factory accessory vent termination kit MUST be used in a direct
vent (2- -pipe) system. See Table 6. See Fig. 34 for required
clearances.
Ventilated Combustion Air Option
In a ventilated combustion air option, the vent terminates and
discharges the flue products directly to the outdoors similar to a
direct vent system. See Fig. 35 for required clearances. All air for
combustion is piped directly to the furnace from a space that is well
ventilated with outdoor air (such as an attic or crawl space) and the
space is well isolated from the living space or garage.
Materials
Combustion- -air and vent pipe, fittings, primers, and solvents must
conform to American National Standards Institute (ANSI)
standards and American Society for Testing and Materials (ASTM)
standards. See Table 5 for approved materials for use in the U.S.A.
CAUTION
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each
appliance connected to the venting system being placed into
operation could result in carbon monoxide poisoning or
death.
The following steps shall be followed for each appliance
connected to the venting system being placed into
operation, while all other appliances connected to the
venting system are not in operation:
1. Seal any unused openings in venting system.
2. Inspect the venting system for proper size and horizontal
pitch, as required in the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 or the CSA B149.1, Natural Gas and
Propane Installation Code
Determine that there is no blockage or restriction, leakage,
corrosion and other deficiencies, which could cause an
unsafe condition.
3. As far as practical, close all building doors and windows
and all doors between the space in which the appliance(s)
connected to the venting system are located and other
spaces of the building.
4. Close fireplace dampers.
5. Turn on clothes dryers and any appliance not connected
to the venting system. Turn on any exhaust fans, such as
range hoods and bathroom exhausts, so they are operating
at maximum speed. Do not operate a summer exhaust fan.
6. Follow the lighting instructions. Place the appliance
being inspected into operation. Adjust the thermostat so
appliance is operating continuously.
7. Test for spillage from draft hood equipped appliances at
the draft hood relief opening after 5 minutes of main burner
operation. Use the flame of a match or candle.
8. If improper venting is observed during any of the above
tests, the venting system must be corrected in accordance
with the National Fuel Gas Code, ANSI Z223.1/NFPA 54
and/or CSA B149.1, Natural Gas and Propane Installation
Code.
9. After it has been determined that each appliance
connected to the venting system properly vents when tested
as outlined above, return doors, windows, exhaust fans,
fireplace dampers and any other gas- -fired burning
appliance to their previous conditions of use.
WARNING
!
FIRE AND EXPLOSION HAZARD
Failure to follow this warning could result in fire, property
damage, personal injury, or death.
Solvent cements are combustible. Keep away from heat,
sparks, and open flame. Use only in well ventilated areas.
Avoid breathing in vapor or allowing contact with skin or
eyes.
For Canadian installations, refer to Page 1 for instructions.
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and these instructions.