Installation Manual

7
• 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replaceinsert,stove,etc.Doingso
mayresultinre,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.
Downow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.