14
Figure 4A
Figure 4B
Figure 4C
Recommended Installation Positions
H
ORIZONTAL
A
PPLICATIONS
& C
ONSIDERATIONS
When installing a furnace horizontally, additional consider-
ation must be given to the following:
F
URNACE
S
USPENSION
If suspending the furnace from rafters or joists, use 3/8"
threaded rod and 2”x2”x1/8” angle iron as shown in the fol-
lowing diagram. The length of rod will depend on the applica-
tion and the clearances necessary.
If the furnace is installed in a crawl space it must be sus-
pended from the floor joist or supported by a concrete pad.
Never install the furnace on the ground or allow it to be ex-
posed to water.
2" 2" 3/8"
ANGLE
IRON
(3
PLACES
)
X
X
Figure 5
F
RONT
C
OVER
P
RESSURE
S
WITCH
T
UBE
L
OCATION
When a furnace is installed horizontally with left side down,
the front cover pressure switch tube must be re-located
to the lower port of the collector box cover.
1. Remove tube from front cover pressure switch and
collector box cover.
2. Remove rubber plug from bottom collector box port
and install on top collector box port.
3. Locate 24” x 1/4” tube in bag assembly.
4. Install one end on front cover pressure switch.
5. Route tube to lower port on collector box cover and
cut off excess tubing.
D
RAIN
T
RAP
AND
L
INES
In horizontal applications the condensate drain trap is se-
cured to the furnace side panel, suspending it below the fur-
nace. A minimum clearance of 5 1/2 inches below the fur-
nace must be provided for the drain trap. Additionally, the
appropriate downward piping slope must be maintained from
the drain trap to the drain location. Refer to
Condensate Drain
Trap and Lines
for further details. If the drain trap and drain
line will be exposed to temperatures near or below freezing,
adequate measures must be taken to prevent condensate from
freezing.
L
EVELING
Leveling ensures proper condensate drainage from the heat
exchanger. For proper flue pipe drainage, the furnace must
be level lengthwise from end to end. The furnace should
have a slight tilt from back to front with the access doors
downhill from the back panel approximately 1/2 to 3/4
inches. The slight tilt allows the heat exchanger condensate,
generated in the recuperator coil, to flow forward to the
recuperator coil front cover.
