Reznor R8HE Unit Installation Manual - Manual (Page 5)

5
GENERAL INFORMATION
This Single Package Gas Heating / Electric Cooling
Unit is designed for outdoor rooftop or ground level
slab installations and can be readily connected to the
duct system of a home or building. This unit has been
tested for capacity and efficiency in accordance with
AHRI standards and will provide many years of safe and
dependable comfort, providing it is properly installed
and maintained. With regular maintenance, this unit will
operate satisfactorily year after year. Abuse, improper
use, and/or improper maintenance can shorten the life
of the appliance and create unsafe hazards.
To achieve optimum performance and minimize equipment
failure, it is recommended that periodic maintenance be
performed on this unit. The ability to properly perform
maintenance on this equipment requires certain tools
and mechanical skills.
Before you install this unit
√ The cooling load of the area to be conditioned must be
calculated and a system of the proper capacity selected.
It is recommended that the area to be conditioned be
completely insulated and vapor sealed.
√ Check the electrical supply and verify the power supply
is adequate for unit operation. Consideration should be
given to availability of electric power, service access,
noise, and shade. If there is any question concerning
the power supply, contact the local power company.
√ All units are securely packed at the time of shipment and
upon arrival should be carefully inspected for damage
prior to installing the equipment at the job site. Verify
coil fins are straight. If necessary, comb fins to remove
flattened or bent fins. Claims for damage (apparent or
concealed) should be filed immediately with the carrier.
√ Survey the job site to determine the best location for
setting the unit. Choose an appropriate location that
minimizes the length of the supply and return air ducts.
√ Please consult your dealer for maintenance information
and availability of maintenance contracts. Please read
all instructions before installing the unit.
Locating the Equipment
• Select a solid, level position, preferably on a concrete
slab, slightly above the grade level, and parallel to the
home. DO NOT PLACE UNIT UNDER THE HOME.
• Overhead obstructions, poorly ventilated areas, and
areas subject to accumulation of debris should be
avoided. Do not place the unit in a confined space or
recessed area where discharge air from the unit to re-
circulate into the condenser air inlet, through the coil.
• Sufficient clearance for unobstructed airflow through the
louvered control access panel and outdoor coil must
be maintained in order to achieve rated performance.
See
Figure 1 for minimum clearances to obstructions.
• A clearance of at least 36 inches from the blower
access panel and from the louvered control access
panel is recommended for servicing and maintenance.
Where accessibility clearances are greater than
minimum clearances to combustibles, accessibility
clearances must take preference.
• The hot condenser air must be discharged up and away
from the home, and if possible, in a direction with the
prevailing wind.
• If practical, place the air conditioner and its ducts in an
area where they will be shaded from the afternoon sun,
when the heat load is greatest.
Heating Load
This unit should be sized to provide the design heating
load requirement. Heating load estimates can be made
using approved methods available from Air Conditioning
Contractors of America (Manual J); American Society of
Heating, Refrigerating, and Air Conditioning Engineers;
or other approved engineering methods. For installations
above 2,000 ft., the unit should have a sea level input
rating large enough that it will meet the heating load after
deration for altitude.
COMBUSTION AIR & VENTING
REQUIREMENTS
WARNING:
Installation methods other than those described
in the following sections must comply with the
National Fuel Gas Code and all applicable local
codes for providing sufficient combustion air
to the unit.
• Provisions must be made during the installation of
this unit that provide an adequate supply of air for
combustion.
• Instructions for determining the adequacy of an
installation can be found in the current revision of the
NFGC (ANSI Z223.1 / NFPA54). Consult local codes
for special requirements. These requirements are for
US installations as found in the NFGC.
• The requirements in Canada (B149.1) are structured
differently. Consult with B149.1 and local code officials
for Canadian installations.
Minimum Required
Clearances to Combustibles
36"
36"
36"
See Note 1 See Note 2
NOTE 1: 6” When coil is present on duct side.
NOTE 2: 1” When no coil is present on duct side.
Figure 1. Clearance Requirements