Reznor R8HE Unit Installation Manual Manual de usuario descargar pdf (Pagina 7)

CIRCULATING AIR SUPPLY

WARNING:

Productsofcombustionmustnotbeallowedto

enterthereturnairductworkorthecirculatingair

supply.Failuretopreventproductsofcombustion

frombeingcirculated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adequatelysealed,

alljointsmustbetaped,andtheductworkmust

besecuredtotheunitwithsheetmetalscrews.

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 that the unit is

mountedmustprovidesoundphysicalsupportof

theunitwithnogaps,cracks,orsaggingbewteen

theunitand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.

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DbytheAir

Conditioning Contractors of America (ACCA).

• The ducts must beproperlysizednotto exceed the

units maximum ESP rating at 400 SCFM per nominal

ton of cooling capacity.

• Ductworkshouldbeattacheddirectlytotheunitanges

for horizontal applications.

• Ifaroofcurbisinstalled,theductsmustbeattachedto

the curb hangers, not the unit.

• It is recommended that the outlet duct be provided

with a removable access panel. The opening should

be accessible when the unit is installed in service and

shall be sizes so that 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 a way that will 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.

UnconditionedSpaces

All duct work passing through unconditioned space must

be properly insulated to minimize duct losses and prevent

condensation. Use insulation with an outer vapor barrier.

Refer to local codes for insulation material requirements.

AcousticalDuctWork

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classied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.

UNIT INSTALLATION

PackagingRemoval

Remove the shipping carton and User’s Manual from the

equipment. Set aside the 13” x 2” PVC pipe for later use

when installing the heat exchanger condensate drain and

vent kit. Take care not to damage the coil or cabinet when

removing the carton. For rooftop installations, remove

and discard the two supports attached beneath the unit

Rigging&Hoisting

WARNING:

Toavoidtheriskofpropertydamage,personal

injury,ordeath,itistherigger’sresponsibility

toensurethatwhatevermeansareusedtohoist

theunitaresafeandadequate:

• Theliftingequipmentmustbeadequateforthe

load.RefertoTable7(page27)forunitweights.

• Theunitmustbeliftedfromtheholesinthe

baserailsusingcablesorchains.

• Spreaderbarsarerequiredtoprotecttheunit

andensureevenloading.

• Keeptheunitinanuprightpositionatalltimes.

Theriggingmustbelocatedoutsidetheunits

center of gravity. Refer to Figure 7 (page 20)

forlocatingthecenterofgravity.

• All panelsmust besecurelyinplaceduring

rigging and hoisting, except control access

panel. See page 48 for additional lifting and

settingofunitrequirements.

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