440 01 1024 01
Specifications are subject to change without notice
33
1
″
max.
Maintain 12
″
clearance above highest antici-
pated snow level or grade whichever is greater.
Figure 35
Concentric Vent and Combustion--
Air Side Termination
Combustion
Air
Vent
25--22--02
12
″
min.
Roof Overhang
Combustion
Air
Vent
Combustion
Air
Concentric Vent Sidewall
Attachment
Vent
45
°
Elbow
(Field Supplied)
25--22--02
Strap
(Field Supplied)
Flush to
1
″
max.
Note:
Securing strap must be field installed to prevent movement of termination kit in side wall.
Figure 36
6. 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 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)
•
Use only the Type of gas approved for this furnace. See
rating plate for approved gas type.
•
A
1
/
8
″
NPT plugged tapping, accessible for a test gauge
connection,must be installed immediately upstream of the
gas supply connection to furnace.
•
Gas supply pressure should be within minimum and
maximum values listed on rating plate. Pressures are
usually set by gas suppliers.
•
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.
•
Do
NOT
allow minimum gas supply pressure to vary
downward. Doing so will decrease input to furnace. Refer to
Table 8, Table 9, Table 10, Table 11
and
Table 12
for
normal gas supply and manifold pressures.
Table 7
Gas Pressures
Gas Type
Supply Pressure
Recommended
Max.
Min.
Natural
7
″
14
″
4.5
″
Propane
11
″
14
″
11
″
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
″
.
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 NFGC and 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
Figure 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
″
long to trap dirt and moisture before it can enter gas control
valve inside furnace.
NOTE:
Refer to
Figure 37
or
Figure 38
for the general layout at
the furnace. The rules listed apply to natural and Propane gas pipe
installations.
NOTE:
On the Dual Certified or Direct Vent models, 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.
