To prevent property damage, personal injury or death,
due to fire, explosions, smoke, soot, condensation,
electric shock or carbon monoxide, this unit must be
properly installed, repaired, operated and maintained.
These instructions are intended as a general guide only for use by
qualified persons and do not supersede any national or local
codes in any way. Compliance with all local, state, or national
codes pertaining to this type of equipment should be determined
prior to installation.
Read this entire instruction manual, as well as the instructions
supplied in separate equipment, before starting the installation.
The installation of the unit, wiring, warm air ducts, venting, etc.
must conform to the requirements of the National Fire Protection
Association; the National Fuel Gas Code, ANSI Z223.1/NFPA No.
54 (latest edition) and the National Electrical Code, ANSI/NFPA
No. 70 (latest edition) in the United States, and any state laws,
local ordinances (including plumbing or wastewater codes), or
local gas utility requirements. Local authorities having jurisdiction
should be consulted before installation is made. Such applicable
regulations or requirements take precedence over the general
instructions in this manual.
Tools and Parts
Gather the required tools before starting installation. Read and
follow the instructions provided with any tools listed here.
Noncorrosive leak detection solution
Test gauge with ¹⁄₈" NPT connection
(for measuring gas supply pressure)
Check local codes and with gas supplier. Check existing gas
supply, electrical supply, and venting, and read "Ductwork
Requirements," "Electrical Requirements" and "Gas Supply
Requirements" before purchasing parts.
To prevent possible equipment damage, property damage,
personal injury or death, the following bullet points must
be observed when installing the unit.
For proper flame pattern within the heat exchanger and
proper condensate drainage, the unit must be mounted level.
The flue outlet hood must be at least 12" (30.5 cm) from any
opening through which flue gases could enter a building, and
at least 36" (91.4 cm) above any forced air inlet located within
10 ft (3 m). The economizer/manual fresh air intake/motorized
fresh air intake and combustion air inlet mounted on the unit
are not affected by this restriction.
To avoid possible corrosion of the heat exchanger, do not
locate the unit in an area where the outdoor air (for example,
combustion air for the unit) will be frequently contaminated by
compounds containing chlorine or fluorine. Common sources
of such compounds include swimming pool chemicals and
chlorine bleaches, paint stripper, adhesives, paints,
varnishes, sealers, waxes (which are not yet dried) and
solvents used during construction and remodeling. Various
commercial and industrial processes may also be sources of
To avoid possible illness or death of the building occupants,
do not locate outside air intake device (economizer, manual
fresh air intake, motorized fresh air intake) too close to an
exhaust outlet, gas vent termination or plumbing vent outlet.
For specific distances required, consult local codes.
Allow minimum clearances from the enclosure for fire
protection, proper operation, and service access. These
clearances must be permanently maintained.
The combustion air inlet and flue outlet hoods on the unit
must never be obstructed. If used, do not allow the
economizer/manual fresh air damper/ motorized fresh air
damper to become blocked by snow or debris. In some
climates or locations, it may be necessary to elevate the unit
to avoid these problems.
When the unit is heating, the temperature of the return air
entering the unit must be between 50°F and 100°F (10ºC and
Ground Level Installations Only
When the unit is installed on the ground adjacent to the
building, a level concrete (or equal) base is recommended.
Prepare a base that is 3" (7.6 cm) larger than the package unit
footprint and a minimum of 3" (7.6 cm) thick.
The base should also be located where no runoff of water
from higher ground can collect in the unit.
Rooftop Installations Only
The roof must have sufficient structural strength to carry the
weight of the unit(s) and snow or water loads as required by
local codes. Consult a structural engineer to determine the
weight capabilities of the roof.