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.
When installing a furnace horizontally, additional consideration
must be given to the following:
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-
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.
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.
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
Leveling ensures proper condensate drainage from the heat exchanger and induced draft blower. 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.
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.
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).
Refer to Horizontal Applications and Conditions - Drain Trap and Lines.
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"