4 18-CD26D1-10
Installer’s Guide
Safety Section 2
Installation Instructions 5
General 5
Location and Clearances 5
Outline Drawings 6
Upflow Installation 8
Downflow Installation 8
Horizontal Installation 8
Air For Combustion and Ventilation 9
Duct Connections 10
Return Air Filters 11
General Venting 15
Vent Tables 19
Horizontal Venting 20
Horizontal Venting Through a Wall 21
Venting Through The Roof 23
Venting Routed Through a Masonry Chimney 24
Downward Venting 26
Condensate Drain Instructions 27
Gas Piping 32
Combustion and Input Check 32
High Altitude Derate 35
Electrical Connections 36
Field Wiring Diagrams 36
Start-up and Adjustment 41
Preliminary Inspections 41
Lighting Instructions 41
Sequence of Operation 41
Control and Safety Switch Adjustments 42
Conditions Affecting System Operation 43
IFC Error Flash Codes 44
Contents
The following safety practices and precautions must be
followed during the installation, servicing, and operation of
this Furnace.
1. Use only with the type of gas approved for this Furnace.
Refer to the Furnace rating plate.
2. Install this Furnace only in a location and position as
specified in “Location and Clearances” (page 5) of these
instructions.
3. Provide adequate combustion and ventilation air to the
Furnace space as specified in “Air for Combustion and
Ventilation” (page 9), of these instructions.
4. Combustion products must be discharged outdoors.
Connect this Furnace to an approved vent system only, as
specified in the “Venting” section (page 15), of these
instructions.
5. Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifically
for the detection of leaks to check all connections, as
specified in the “Gas Piping” section of these instructions
on page 31.
6. Always install the Furnace to operate within the
Furnace’s intended temperature-rise range with a duct
system which has an external static pressure within the
allowable range, as specified on the unit rating plate.
Airflow with temperature rise for cfm versus static is
shown in the Service Facts accompanying this Furnace.
7. When a Furnace is installed so that supply ducts carry
air circulated by the Furnace to areas outside the space
containing the Furnace, the return air shall also be
handled by a duct(s) sealed to the Furnace casing and
terminating outside the space containing the Furnace.
8. A gas-fired Furnace for installation in a residential
garage must be installed as specified in “Location and
Clearances” section (page 5) , of these instructions.
9. The Furnace may be used for temporary heating of
buildings or structures under construction
only when the
following conditions have been met:
a. The Furnace venting system must be complete and
installed per manufacturers instructions.
b. The Furnace is controlled only by a room Comfort
Control (no field jumpers).
c. The Furnace return air duct must be complete and
sealed to the Furnace.
d. The Furnace input rate and temperature rise must
be verified to be within nameplate marking.
e. 100% of the Furnace combustion air requirement
must come from outside the structure.
f. The Furnace return air temperature range is be-
tween 55
0
and 80
0
Fahrenheit.
g. Clean the Furnace, duct work, and components upon
substantial completion of the construction process, and
verify Furnace operating conditions including ignition,
input rate, temperature rise and venting, according to the
manufacturer's instructions.
10. This product must be gas piped by a Licensed Plumber or
Gas Fitter in the Commonwealth of Massachusetts.
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