CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below fbr each appliance
connected to the venting system being placed into operation
could result in carbon rnonoxide poisoning or death
The following steps shall be fbllowed 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 t!-_eventing system for proper size and horizontal
pitch, as required in the National Fuel Gas Code, ANSI
Z223A=2002NFPA 54°2002 or the CSA B149.1, Natural
Gas and Propane Installation (?ode and these instructions.
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. (?lose 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 tim.
6 Follow t!-_etighting instructions Ptace the appliance being
inspected into operation. Adjust the thermostat so appli=
ance is operating continuously
7 Test for spillage flora drak 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 con'ected in accordance
with the National Fuel Gas (ode, ANSI Z223.1=
2002 NFPA 54-2002 and/or (SA B 149.1, Natural Gas and
Propane Installation Code.
9 After it has been deternrined that each appliance connected
to the venting system properly vents when tested as
outlined above, remm doors, windows, exhaust fans,
fireplace dampers and any other gas-fired appliance to their
previous conditions of use.
Vent system or vent connectors rnay need to be resizcd. For any
other appliances when resizing vent systems or vent connectors,
system or connector must be sized to approach mininmm size as
determined using appropriate table fbund in the NFGC or NSC=
NGPIC.
COMBUSTION=AIR AND VENT PIPING
General
FIRE AND EXPLOSION HAZARD
Failure to %llow this warning could result in fire, property
damage, personal injuw, or death
Solvent cements are combustible. Keep away fiom heat,
sparks, and open flame. Use only in well°ventilated areas.
Avoid breathing in vapor or allowing contact with skin or
eyes.
( ombustion°air and vent pipe, fittings, printers, and solvents must
conform to American National Standards Institute (ANSI) stan=
dards and American Society for Testing and Materials (ASTM)
28
standards See Table 7 for approved rnaterials %r use in the U.S.A.
See Table 8 fPr nlaxinmm pipe lengths and Fig 39, 40, and 41 fbr
exterior piping arrangements
In Canada, construct all cornhustion-air and vent pipes [br this unit
of CSA or UL( listed schedule-40 PVC, PV(-DWV or ABS=
DWV pipe and pipe cement. SDR pipe is NOT approved in
Canada
Vent pipe re*ruination must be installed with adequate clearances
to building openings and equipment to comply with national and
tocal codes,
Combustion Air Pipe
UNIT CORROSION HAZARD
Excessive exposure to contaminated congt_ustion air may
result in safety and perfbrmance related problems.
Combustion air must not be taken front inside a structme that
is fi'equently contaminated by halogens, which include fluo=
rides, chlorides, bromides, and iodides These elements are
found in aerosols, detergents, bleaches, cleaning solvents,
salts, air fresheners, adhesives, paint, and other household
products. Locate combustion-air inlet as fbr as possible fi'om
swimming pool and swimming pool pump house
NOTE: Furnace combustion°air connections are sized fPr 2°in.
pipe. The combustion=air pipe will be 2=in. diameter in all
installations.
See Table 10 fbr required clearances,
Furnace combustion°air connection must be attached as shown in
Fig 34 Combustion-air intake housing plug may need to be
relocated in some applications,
Combustion-air pipe must terminate outside of f:urnace casing with
1 elbow Orient elbow so that opening faces down fbr upflow or
downf]ow applications Orient elbow so that it faces sideways (left
or right) for horizontal left or horizontal right applications (See
Fig 34,) Maintain a 3-in. mininmnt clearance between the opening
of' the comhustion-air inlet pipe and any object,
NOTE: All pipe joints must be cemented except attachment of
comhustion-air inlet pipe to inlet housing connection, since it may
be necessary to remove pipe for servicing.
Install combustion air inlet pipe as fbllows:
1. Assemble combustion-air inlet pipe.
a. Permanently install perforated disk assembly (factory-
supplied in loose parts bag) in combustion°air elbow using
RTV or by cementing. (See Fig. 35.)
For 120,990 Btuh size unRs only: Separate the 2 halves of
perfPrated disk assembly and use only the shouldered disk
half,
b. Determine length of straight portion of combustion°air inlet
pipe fi'om table in Fig. 35.
c. (ut field°supplied 2-in diameter PVC pipe to detem_ined
length.
d, Permanently attach elbowiperfbrated disk assembly to
straight portion of' pipe using RTV or by cementing. (See
Fig. 35)
2, Attach con-{bustion-air inlet pipe
a Detem_ine tocation of combustion-air intake pipe connec°
tion to combustion-air intake housing as shown in Fig 34
fbr application.
b. Reposition combustion°air intake housing plug fitting in
appropriate unused intake housing connection.
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