Install Instructions
Table Of Contents
- Safety Considerations
- Electrostatic Discharge (ESD) Precautions
- To The Installer
- Product Application
- Location Requirements & Considerations
- Clearances and Accessibility
- Combustion & Ventilation Requirements
- Installation Positions
- Horizontal Applications & Considerations
- Vent Pipe & Combustion Air Pipe
- Materials – Installations In The U.S.A.
- Materials – Installations In Canada
- Pipe Installation
- Combustion Air Pipe Connection
- Vent/Intake Terminations For Installation of Multiple Direct Vent Furnaces
- Condensate Drain Lines & Drain Trap
- General Drain Information
- Field Supplied Drain
- Upflow Model Installed Vertically
- Drain Exiting Right Side
- Drain Exiting Left Side
- Upflow Model Installed Horizontally with Right Side Down
- Upflow Model Installed Horizontally with Left Side Down
- Upflow Model Installed Horizontally With Left Side Down - Alternate
- CounterFlow Model Installed Vertically
- Drain Exiting Left Side (See Figure 28)
- Drain Exiting Right Side (See Figure 29)
- Counterflow Model Installed Horizontally with Right Side Down (See Figure 30)
- Counterflow Model Installed Horizontally with Left Side Down (See Figure 31)
- Electrical Connections
- Gas Supply and Piping
- High Altitude Installation
- Circulating Air & Filters
- Filters - Read This Section Before Installing The Return Air Duct work
- Startup Procedure & Adjustment
- Gas Supply Pressure Measurement
- Operational Checks
- Safety Circuit Description
- Maintenance
- Filters
- Before Leaving an Installation
- Repair and Replacement Parts
- Special Instructions for Products Installed in the State of Massachusetts
9
• Do not connect this furnace to a chimney ue that
serves a separate appliance designed to burn solid
fuel.
• On Counterow Installations, the air conditioning coil
must be downstream on the supply (positive) side of
the furnace heat exchanger.
Before setting the furnace over the plenum opening,
ensure the surface around the opening is smooth
and level. A tight seal should be made between the
furnace base and oor by using a silicone rubber
caulking compound or cement grout.
If installation over a combustible oor becomes
necessary, use an accessory sub-base (see
Specication Sheet applicable for your model for
details.) A special accessory sub-base must be used
for upright counterow unit installations over any
combustible material including wood. Refer to sub-
base instructions for installation details. Follow the
instructions with the sub-base for proper installation.
Do not install the furnace directly on carpeting, tile, or
other combustible material other than wood ooring.
(NOTE: The sub-base will not be required if an air
conditioning coil is installed between the supply air
opening on the furnace and the oor.)
Position* Sides Rear Front Bottom Flue Top
Upflow 0" 0" 3" C 0" 1"
Horizontal 6" 0" 3" C 0" 6"
*M9S96* & *M9S92* Minimum Clearances To Combustible Materials (Inches)
C = If placed on combustible floor, floor MUST be wood only.
Position* Sides Rear Front Bottom Flue Top
Counterflow 0" 0" 3" NC 0" 1"
Horizontal 6" 0" 3" C 0" 6"
*C9S96* Minimum Clearances To Combustible Materials (Inches)
C = If placed on combustible floor, floor MUST be wood only.
NC = For installations on non-combustible floors only. A combustible subbase must be
used for installations on combustible flooring.
TOP
BOTTOM
SIDE SIDE SIDE
TOP
BOTTOM
Upflow Counterflow Horizontal
NOTES:
• For servicing or cleaning, a 24” front clearance is
required.
• Unit connections (electrical, ue and drain) may
necessitate greater clearances than the minimum
clearances listed above.
• Clearance in accordance with local installation
codes, the requirements of the gas supplier and the
manufacturer’s installation instructions.
• Dégaugement conforme aux codes d’installation
locaux, aux exigences du fournisseur de gaz et aux
instructions d’installation du fabricant.
• In all cases, accessibility clearance must take
precedence over clearances from the enclosure
where accessibility clearances are greater.
Installations must adhere to the clearances to combustible
materials to which this furnace has been design certied.
The minimum clearance information for this furnace is
provided on the unit’s clearance label. These clearances
must be permanently maintained. Clearances must
also accommodate an installation’s gas, electrical, and
drain trap and drain line connections. If the alternate
combustion air intake or vent/ue connections are used
additional clearance must be provided to accommodate
these connections. Refer to
for details.
combustible materials, a minimum of 24 inches
service clearance must be available in front of the unit.
A furnace installed in a conned space (i.e., a closet or utility
room) must have two ventilation openings with a total minimum
free area of 0.25 square inches per 1,000 BTU/hr of furnace
input rating. Refer to Specication Sheet applicable to your
model for minimum clearances to combustible surfaces. One
of the ventilation openings must be within 12 inches of the top;
the other opening must be within 12 inches of the bottom of
the conned space. In a typical construction, the clearance
between the door and door frame is usually adequate to
satisfy this ventilation requirement.
The following vent testing procedure is repro duced from
the American National Standard/National Standard