Reznor R6GN Unit Installation Manual - Manual (Page 8)

8
• Make sure that 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.
Air Ducts
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).
• The ducts must be properly sized and not exceed 0.2”
W.C. pressure drop at 400 scfm per nominal ton of
cooling capacity.
• Duct work should be attached directly to the unit flanges
for horizontal applications.
• If roof curb is installed, the ducts must be attached to
the curb hangers, not the unit.
• 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.
Air Filter Requirements
WaRNING:
Never operate the unit without a filter in place.
Dust and lint could accumulate on internal
parts, resulting in loss of efficiency, equipment
damage and possible fire.
• All return air must pass through the filters before entering
the evaporator coil. It is important that all filters be kept
clean and replaced frequently to ensure proper operation
of unit. Dirty or clogged filters will reduce the efficiency
of the unit and result in unit shutdowns. Refer to Table
1 for recommended filter sizes.
• Air filter pressure drop must not exceed 0.08 inches WC.
uNIt
FactoRY
FIltER SIZE
QtY
R6GN-150(C,D)-(180, 270)C 16x20x2 8
R6GN-180(C,D)-(270, 315)C 16x20x2 8
Table 1. Filter Sizes & Quantities