Reznor R6GP Unit Installation Manual - Manual (Page 7)

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• Make sure the exhaust gases will not impinge on windows
or building surfaces, which may be compromised or
damaged by condensation.
• Do not install the unit in a location where exhaust from
the vent termination will be directed into windows,
stairwells, under decks, or other recessed areas.
CIRCULATING AIR SUPPLY
WARNING:
Do not allow combustion products to enter the
return air ductwork or the circulating air supply.
Failure to prevent the circulation of combustion
products into the living space can create
potentially hazardous conditions including
carbon monoxide poisoning that could result
in personal injury or death.
All return ductwork must be secured to the unit
with sheet metal screws. All return ductwork
must be adequately sealed and all joints must
be taped. When return air is provided through
the bottom of the unit, the joint between the
unit and the return air plenum must be air tight.
The roof curb or cement pad on which the unit is
mounted must provide sound physical support
of the unit with no gaps, cracks, or sagging
between the unit and the curb or pad.
Return air and circulating air ductwork must not
be connected to any other heat producing device
such as a fireplace insert, stove, etc. Doing so
may result in fire, explosion, carbon monoxide
poisoning, personal injury, or property damage.
This unit is designed only for use with a supply and return
duct. Air ducts should be installed in accordance with the
standards of the National Fire Protection Association
“Standard for Installation of Air Conditioning Systems”
(NFPA 90A), “Standard for Installation of Residence Type
Warm Air Heating and Air Conditioning Systems” (NFPA
90B), and all applicable local codes. NFPA publications are
available by writing to: National Fire Protection Association,
Batterymarch Park, Quincy, ME 02269 or visit www.NFPA.
org on the web.
• Design the duct work according to Manual Q by the Air
Conditioning Contractors of America (ACCA) or similar
commercial methods.
• If roof curb is installed, the ducts must be attached to
the curb hangers, not the unit.
•
Duct work should be attached directly to the unit flanges
for horizontal applications.
• It is recommended that the outlet duct be equipped
with a removable access panel. This opening should
be accessible when the unit is installed in service and
shall be of a size such that the smoke or reflected
light may be observed inside the casing to indicate the
presence of leaks in the heat exchanger. The cover for
the opening shall be attached in such a manner as to
prevent leaks.
• If outside air is utilized as return air to the unit for
ventilation or to improve indoor air quality, the system
must be designed so that the return air to the unit is
not less than 50° F (10° C) during heating operation.
• If a combination of indoor and outdoor air is used, the
ducts and damper system must be designed so that the
return air supply to the furnace is equal to the return air
supply under normal, indoor return air applications.
• This unit is shipped ready for downflow duct
connections and is easily converted for horizontal
duct connections with an optional accessory kit.
See the unit Technical Sales Literature for factory
and field installed accessory information and part
numbers. This information can also be found online at
www.nordyne.com.
Downflow to Horizontal Conversion
The unit is shipped ready for downflow duct connections. If
horizontal ducts are required, the unit must be converted
according to the directions in the conversion kit for both
the supply and return ducts.
Always review the horizontal kit instructions prior to
changing the air temperature limits for horizontal operation
of the gas heat exchanger.
Unconditioned Spaces
All ductwork passing through unconditioned space must be
properly insulated to prevent condensation and minimize
duct losses. Use insulation with an outer vapor barrier.
Refer to local codes for insulation material requirements.
Acoustical Ductwork
Certain installations may require the use of acoustical
lining inside the supply duct work.
•
Acoustical insulation must be in accordance with the
current revision of the Sheet Metal and Air Conditioning
Contractors National Association (SMACNA) application
standard for duct liners.
•
Duct lining must be UL classified batts or blankets with
a fire hazard classification of FHC-25/50 or less.
• Fiber duct work may be used in place of internal duct
liners if the fiber duct work is in accordance with the
current revision of the SMACNA construction standard
on fibrous glass ducts. Fibrous duct work and internal
acoustical lining must be NFPA Class 1 air ducts when
tested per UL Standard 181 for Class 1 ducts.