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10. Operate the furnace through one heat cycle to ensure com-
bustion air and vent pipes are properly connected to the
concentric termination connections.
GAS SUPPLY AND PIPING
WARNING
!
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.
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 Requirements
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.
1
S A
/
" NPT plugged tapping, accessible for a test gauge
8
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 5 for
Gas supply. Refer to Table 6 or Table 7 for manifold pressures.
Strap
(Field Supplied)
Vent
Combustion
Air
45° Elbow
(Field Supplied)
Note:
Securing strap must be field installed to prevent movement of termination kit in side wall.
Fig. 33 - - Concentric Vent Sidewall Attachment
Gas Type
Natural
Propane
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 li-
censed plumber or gas fitter.
b. When flexible connectors are used, the maximum
length shall not exceed 36"(914.4 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 ap-
proved 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. Re-
fer to the current edition of 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. 34.
3. Use black iron or steel pipe and fittings or other pipe ap-
proved 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" long to trap dirt and moisture before it can enter gas
control valve inside furnace.
NOTE: Refer to Fig. 34 for the general layout at the furnace.
The rules listed apply to natural and Propane gas pipe
installations.
NOTE: Install the gas pipe grommet to the furnace side panel
with the gas pipe entry. If needed, remove the 2" hole plug from
the plastic accessory bag and relocate to the open hole in the
furnace side panel.
6. Use two pipe wrenches when making connections to pre-
Combustion
Air
vent 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 con-
Vent
nectors, always use a new listed connector.
Flush to
Do not use a connector which has previously serviced an-
1" max.
other 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.
A07723
10. Properly size gas pipe to handle combined appliance load
or run gas pipe directly from gas meter or Propane gas reg-
ulator.
11. Install correct pipe size for run length and furnace rating.
12. Measure pipe length from gas meter or Propane second
stage regulator to determine gas pipe size.
32
Gas Pressures
Supply Pressure
Recommended
Max.
7"
14"
11"
14"
Table 5 – Gas Pressures
Min.
4.5"
11"
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