-- 31 --
NON-DIRECT VENT/1-PIPE SYSTEM (SIZES 040
THROUGH 120 ONLY)
In a non-direct vent (1-pipe) system, all air for combustion is
taken from the area adjacent to furnace, and all flue products are
discharged to outdoor atmosphere. A factory-supplied perforated
disk assembly (in loose parts bag) MUST be used in
combustion-air pipe elbow.
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, NFPA
54/ANSI Z223.1--2006/NFPA 54--2006 or the CSA
B149.1--05, Natural Gas and Propane Installation Code
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. 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, NFPA
54/ANSI Z223.1--2006 and/or CSA B149.1--05, 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
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 7 for approved materials for use in
the U.S.A.
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.
!
WARNING
In Canada, construct all combustion-air and vent pipes for this
unit of CSA or ULC listed schedule -- 40 PVC, PVC-DWV or
ABSDWV pipe and pipe cement. SDR pipe is NOT approved
in Canada.
In direct vent (2-pipe) systems, combustion air and vent pipes
must terminate together in same atmospheric pressure zone,
either through roof or sidewall (roof termination preferred), using
accessory termination kit. See Table 8 for required clearances.
In non-direct vent (1-pipe) system, vent pipe termination must be
installed with adequate clearances to building openings and
equipment to comply with national and local codes. See Table 9
for required clearances.
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in property damage,
personal injury, or death.
All combustion-air and vent pipes must be airtight and
watertight. Pipes must also terminate exactly as shown in Fig.
42 for direct vent (2-pipe) system and Fig. 43 for non-direct
vent (1-pipe) system.
!
WARNING
An abandoned masonry chimney may be used as a raceway for
properly insulated and supported combustion-air (when
applicable) and vent pipes. Each furnace must have its own set of
combustion-air and vent pipes and be terminated individually, as
shown in Fig. 42 for Direct Vent (2-Pipe) system and Fig. 43 for
Non-Direct Vent (1-Pipe) system.
A furnace shall not be connected to a chimney flue serving a
separate appliance designed to burn solid fuel.
Other gas appliances with their own venting system may also use
the abandoned chimney as a raceway providing it is permitted by
local code, the current edition of the National Fuel Gas Code and
the vent or liner manufacturer’s installation instructions. Care
must be taken to prevent the exhaust gases from one appliance
from contaminating the combustion air of other gas appliances.
UNIT MAY NOT OPERATE
Failure to follow this caution may result in intermittent unit
operation.
When vent pipe is exposed to temperatures below
freezing,such as when it passes through an unheated space or
when a chimney is used as a raceway, pipe must be insulated
as shown in Table 10 with Armaflex-type insulation.
CAUTION
!
Furnace combustion air and vent pipe connections are sized for
2-in. (51 mm) pipe. Any pipe size change should be made outside
furnace casing in vertical pipe. The transition has to be made as
close to the furnace as reasonably possible.
58MCB
