34
•
Protect connectors and semirigid tubing against physical and
thermal damage when installed. Ensure aluminum-alloy tubing
and connectors are coated to protect against external corrosion
when in contact with masonry, plaster, or insulation, or subjected
to repeated wetting by liquids such as water (except rain
water), detergents, or sewage.
Gas Piping Connections
The gas piping may enter the left or right side of the furnace
cabinet. The installer must supply rigid pipe long enough to reach
the outside of the cabinet to seal the grommet cabinet penetra-
tion. A semi-rigid connector to the gas piping can be used outside
the cabinet per local codes. 1/2” NPT pipe and fittings are re-
quired. For models with an “L” shaped manifold, a 4 1/2”
long nipple is required. For models with a hook shaped mani-
fold, a 2” long nipple is required.
From the elbow, the length of pipe and the fittings required will vary by the side chosen, location of union and cabinet width.
The union may be placed inside or outside of the cabinet.
G
AS
P
IPING
C
HECKS
Before placing unit in operation, leak test the unit and gas connections.
Check for leaks using an approved chloride-free soap and water solution, an electronic combustible gas detector, or other approved
testing methods.
Manual Shut Off Valve
(upstream from
ground joint
pipe union)
When gas line is in the alternate location, swap the position
of the plug and grommet.
UPFLOW - HORIZONTAL LEFT
Figure 37
Drip Leg
Plug in Main Gas Line Hole
Alternate
Union
Location
Manual Shut Off Valve
(upstream from
ground joint pipe union)
Gas
Valve
Burners
Drain Trap
Manifold
Plug in Alternate Gas Line Hole
Grommet in
Standard Gas Line Hole
Drip leg may terminate with a 1/2” x 1/8” pipe plug to accommodate
line gas pressure measurement.
COUNTERFLOW - HORIZONTAL RIGHT
Figure 38
E
DGES
OF
SHEET
METAL
HOLES
MAY
BE
SHARP
. U
SE
GLOVES
AS
A
PRECAUTION
WHEN
REMOVING
HOLE
PLUGS
.
WARNING
T
O
AVOID
THE
POSSIBILITY
OF
EXPLOSION
OR
FIRE
,
NEVER
USE
A
MATCH
OR
OPEN
FLAME
TO
TEST
FOR
LEAKS
.
WARNING
