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WARNING
All field gas piping must be pressure and leak-tested prior
to operation. Never use an open flame to check for leaks.
Personal injury may result. Use a soap solution or other
leak detecting solution.
Pressure/leak test all connections prior to putting unit in service.
The furnace gas piping was leak-tested prior to shipping.
However, during shipping and installation connections may have
loosened. Check for leaks using a soap solution and correct any
leaks before placing furnace in operation.
VENTING
Gas furnaces must be connected to a properly designed venting
system to convey flue gases away from the heating system or out-
side of the heated space. See the section Installation Requirements
on page 194 for reference to applicable codes and standards. The
rack assembly requires a special venting system.
Venting for Outdoor Installations
For outdoor applications, a flue riser kit is available. See Fig. 155.
In outdoor installations where the flue riser kit is not used, the
venting system must be properly designed for the specific applica-
tion by a manufacturer/provider of the listed type of venting sys-
tems. The connection from furnace-induced draft fans to round
vent pipe requires custom adapters to ensure leak-free joints. Con-
tact a venting system manufacturer for availability, if the venting
system was not included with the heating system.
18" MIN ABOVE
TOP OF AHU
CABINET
Fig. 155 — Outdoor Venting with Flue Riser Kit
Venting for Indoor Installations
For all indoor installations, a listed venting system must be proper-
ly designed for the specific application. A factory vent riser kit is
available. See Fig. 156 for an example.
For indoor installations where the factory flue riser kit is not used,
the venting system must be properly designed for the specific ap-
plication by a manufacturer/provider of the listed type of venting
systems. Connection from furnace-induced draft fans to round
vent pipe requires custom adapters to ensure leak-free joints. Con-
tact a venting system manufacturer for availability, if the venting
system was not included with the heating system.
Horizontal Vent System Installation
For all indoor rack system horizontal vent installations, note the
COMBUSTION
AIR INTAKE
LOUVERS
OPTIONAL
FLUE
RISER
197
Fig. 156 — Indoor Venting with Flue Riser Kit
Vertical Vent (Category 1) System Installation
For all indoor rack system vertical vent installations, note the fol-
lowing for proper installation:
•
See Fig. 157 for Category 1 indoor vertical vent system.
•
Vent system must be sized and installed in accordance with
ANSI Z223. 1 (NFPA 54). See Table 42 - Category 1 Vent
Diameters.
•
Use UL-441 Type B Vent materials.
•
Minimize use of elbows and horizontal runs in vent piping
•
Vent must terminate in a listed, weatherproof vent cap.
•
Determine height from highest heater discharge point to
roof of building. Vent pipe must extend at least 2 ft
(0.61 m) above the highest point on the roof.
•
Vent connectors serving Category 1 heaters must not be
connected into any portion of a mechanical draft system
operating under positive pressure.
•
Separated combustion systems are not permitted in multi-
ple heater assemblies.
LISTED VENT CAP
24" MIN.
MIN. 5 FT
OPTIONAL
VENT KIT
DRAIN
Fig. 157 — Category 1 Indoor Vertical Vent System
following for proper installation:
COMBUSTION
AIR INTAKE
LOUVERS
OPTIONAL
VENT KIT
ROOF LINE
SEE CATEGORY I
TABLE FOR SIZE
INCREASER/ADAPTOR
SIDE OF RACK SYSTEM
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