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33
1″ (25.4mm) max.
Maintain 12″ (304.8mm) clearance
above highest anticipated snow level
or grade whichever is greater.
Combustion
Air
Vent
25--22--02
12″ (304.8mm) min.
Roof Overhang
A07736
Fig. 35 -- Concentric Vent and Combustion-- Air
Side Termination
Combustion
Air
Vent
Combustion
Air
Vent
45° Elbow
(Field Supplied)
25--22--02
Strap
(Field Supplied)
Flush to
1″ (25.4mm)
max.
Note:
Securing strap must be field installed to prevent movement of termina -
tion kit in side wall.
A07723
Fig. 36 -- Concentric Vent Sidewall Attachment
GAS SUPPLY AND PIPING
FIRE AND EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Models designated for Natural Gas are to be used with Natural
Gas ONLY, unless properly converted to use with Propane gas.
!
WARNING
NOTE: The rating plate is stamped with the model number, gas
type and gas input rating. In addition, models manufactured for sale
in Canada have orifice size information stamped on the rating plate.
Gas Supply R equirements
FIRE HAZARD
Failure to follow this warning could result in personal injury
or death.
Do NOT set input rating above that shown on rating plate.
!
WARNING
Gas supply pressure should be within minimum and maximum
values listed on rating plate. Pressures are usually set by gas
suppliers.
(See Propane Gas Conversion Kit instruction manual for furnaces
converted to Propane gas)
S Use only the Type of gas approved for this furnace. See rating
plate for approved gas type.
S A
1
/
8
″ NPT plugged tapping, accessible for a test gauge
connection,must be installed immediately upstream of the gas
supply connection to furnace.
S Gas supply pressure should be within minimum and maximum
values listed on rating plate. Pressures are usually set by gas
suppliers.
S Gas input must not exceed the rated input shown on the rating
plate. Overfiring will result in failure of heat exchanger and cause
dangerous operation.
S Do not allow minimum supply pressure to vary downward.
Doing so will decrease input to furnace. Refer to Table 6 for Gas
supply. Refer to Tables 7 through 10 for manifold pressures.
Table 6 Gas Pressures
Gas Type
Supply Pressure
Recommended Max. Min.
Natural
7inwc
(1744 Pa)
14 in wc
(3487 Pa)
4.5inwc
(1121 Pa)
Propane
11 in wc
(2740 Pa)
14 in wc
(3487 Pa)
11 in wc
(2740 Pa)
Gas Piping Requirements
NOTE: The gas supply line must be installed by a qualified service
technician in accordance with all building codes.
NOTE: In the state of Massachusetts.
a. Gas supply connections MUST be performed by a
licensed plumber or gas fitter.
b. When flexible connectors are used, the maximum length
shall not exceed 36″ (915 mm).
c. When lever handle type manual equipment shutoff
valves are used, they shall be T -- handle valves.
d. The use of copper tubing for gas piping is NOT
approved by the state of Massachusetts.
1. Install gas piping in accordance with local codes, or in the
absence of local codes, the applicable national codes. Refer
to NFPA 54/ANSI Z223.1 for proper gas pipe size.
2. It is recommended that a manual equipment shutoff valve be
installed in the gas supply line outside the furnace. Locate
valve as close to the furnace as possible where it is readily
accessible. Refer to Fig. 37.
3. Use black iron or steel pipe and fittings or other pipe
approved by local code.
4. Use pipe thread compound which is resistant to natural and
Propane gases.
5. Use ground joint unions and install a drip leg no less than 3″
(76.2mm) long to trap dirt and moisture before it can enter
gas controlvalve inside furnace.
6. Use two pipe wrenches when making connections to prevent
gas valve from turning.
7. Install a manual shut--off valve external to furnace casing
and tighten all joints securely.
8. If local codes allow the use of flexible gas appliance
connectors, always use a new listed connector.
Do not use a connector which has previously serviced
another gas appliance.
9. Flexible corrugated metal gas connector may NOT be used
inside the furnace or be secured or supported by the furnace
or ductwork.
58HDV