8. For horizontal installations, line contact is permissible only
between lines formed by intersection of back and two sides
of furnace jacket, and building joists, studs or framing.
9. Residential garage installations require:
• Burners and ignition sources installed at least
18" (457mm) above the floor.
• Located or physically protected from possible damage by a
vehicle.
10. Local codes may require a drain pan under the entire fur-
nace and condensate trap when the furnace is installed in
attic application.
HorizontalFurnaceInstallation
Fire, Explosion, and/or Poison carbon monoxide gas
Hazard.
Make certain model installed is certified for use in
multiple configurations.
Failure to install unit in configuration for which it is
certified can result in death, personal injury and/or
property damage.
NOTE: Inspect unit rating plate to be certain model number be-
gins with "NTGM", GNK" "NCGM" or "GCK'. This identifies unit
as horizontally mountable. If unit does NOT bear this designation,
you may NOT mount this unit horizontally. Unit may not be
mounted on its back.
If you purchased a horizontally mountable furnace, it can be
installed horizontally in an attic, basement, crawl space, alcove,
or suspended from a ceiling in a basement or utility room in only a
right-to-left (NTGM/GNK) or left-to-right (NCGM/GCK) air-
flow position. See Figure 5 or Figure 6. Do not install furnace on
its back or in the reverse airflow positions as safety control opera-
tion will be adversely affected.
Typical Horizontal Installation
(NTGM/GNK)
Inlet Pipe
Vent
Pipe
Condensate
Trap (field
supplied)
25-21-81 a
NOTE: 5" bottom clearance required for condensate trap.
Typical Horizontal Installation
(NCGM/GCK)
Inlet Pipe (Optional)
Vent Pipe
Condensate
Trap (field
supplied)
25-21-81
NOTE: 5" bottom clearance required for condensate trap.
If the furnace is to be suspended from the floor joists in a crawl
space or the rafters in an attic, it is necessary to use steel pipe
straps or an angle iron frame to ridgely attach the furnace to pre-
vent movement. These straps should be attached to the furnace
with sheet metal screws and to the rafters or joists with bolts. The
preferred method is to use an angle iron frame bolted to the rafters
or joists. (Take caution to allow door panels to be removed for
maintenance)
If the furnace is to be installed in a crawl space, consult local
codes. A suitable concrete pad or blocks are recommended for
crawl space installation on the ground.
NOTE: 5" bottom clearance required for condensate trap.
Thirty (30) inches(760mm) between the front of the furnace and
adjacent construction or other appliances MUST be maintained
for service clearance.
Keep all insulating materials clear from Iouvered door. Insulating
materials may be combustible.
The horizontal furnaces may be installed directly on combustible
wood flooring or supports as long as all required furnace clear-
ances are met. See Figure 3.
This furnace MUST NOT be installed directly on carpeting or tile
or other combustible material other than wood flooring or sup-
ports.
For horizontal installation over a finished living space. A field fab-
ricated auxiliary drain pan with drain pipe is recommended to pre-
vent damage by overflow due to blocked condensate drain.
BlockedCondensateDrainPressureSwitch
(AccessoryKit NAHL001HK)
For horizontal furnace installations, a blocked condensate drain
pressure switch MUST be used. Follow the directions outlined in
the kit to properly install the switch into the furnace. See Figure 7
or Figure 8.
440 01 100201
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