10
be attached to the back of the furnace. Contact your distributor for proper airflow requirements and number of required ductwork
connections. Refer to “Recommended Installation Positions” figure for appropriate installation positions, ductwork connections,
and resulting airflow arrangements.
H
ORIZONTAL
A
PPLICATIONS
& C
ONSIDERATIONS
When installing a furnace horizontally, additional consideration
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 following diagram.
The length of rod will depend on the application and the clear-
ances necessary.
If the furnace is installed in a crawl space it must be suspended
from the floor joist or supported by a concrete pad. Never install
the furnace on the ground or allow it to be exposed to water.
F
RONT
C
OVER
P
RESSURE
S
WITCH
T
UBE
L
OCATION
When an upflow model is installed horizontally with left side
down or a counterflow model is installed horizontally with right
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 parts bag.
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 secured to the furnace side panel, suspending it below the furnace. A minimum
clearance of 5.5” below the furnace 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.
A
LTERNATE
E
LECTRICAL
AND
G
AS
L
INE
C
ONNECTIONS
This furnace has provisions allowing for electrical and gas line connections through either side panel. In horizontal applications the
connections can be made either through the “top” or “bottom” of the furnace.
D
RAIN
P
AN
A drain pan must be provided if the furnace is installed above a conditioned area. The drain pan must cover the entire area under the
furnace (and air conditioning coil if applicable).
F
REEZE
P
ROTECTION
Refer to
Horizontal Applications and Conditions - Drain Trap and Lines.
P
ROPANE
G
AS
/H
IGH
A
LTITUDE
I
NSTALLATIONS
This furnace is shipped from the factory configured for natural gas at standard altitude. Propane gas installations require an orifice
and spring change to compensate for the energy content difference between natural and propane gas.
2" 2" 3/8"
ANGLE
IRON
(3
PLACES
)
X
X
Figure 3
