Residential Gas Furnaces

Installation Instructions

*RA Full Size Series 80+ High Efficiency Upflow/Horizontal *RK Full Size Series 80+ High Efficiency Downflow

EFFICIENCY RATING CERTIFIED

ama

*RA 80+ Upflow/Horizontal *RK 80+ Downflow

/\ WARNING: WHAT TO DO IF YOU Improper installation, adjustment, al- SMELL GAS:

teration, service, or maintenance can cause injury or property damage. Refer ¢ Do not try to light any appliance.

to this manual. For assistance or

additional information consult a quali- + Do not touch any electrical switch; do not fied installer, service agency, or the use any phone in your building.

gas supplier.

¢ Immediately call your gas supplier from a neighbor’s phone. Follow the gassupplier’s instructions.

/\ FOR YOUR SAFETY:

¢ If you cannot reach your gas supplier, call

Do not store or use gasoline or other the fire department. flammable vapors and liquids in the vi- cinity of this or any other appliance. ¢ Extinguish any open flame.

These instructions are primarily intended to assist qualified individuals experienced in the proper installation of this appliance. Some local codes require licensed installation/service personnel for this type of equipment. Read all instructions carefully before starting the installation.

Table of Contents

FUFMACE: SPeOCiTICAtlONS a. ccicccesere cia eeendecedeceec ste ecetuccedce ces ceeesenauceseecceudeacetsecdcoucusudwes cescesecwctecupesdteeeense 4-5 Uptlow/Herizonital IMOGGIS a csisescitet iat sucsteeuet Livan sa deddae uve vantceataivuiraadenstpeetuaduuvarvsdulotevtasielaawels 4 DoOwntlow IMOGGIS os tice cet cord. cect rvenecicectesnexhascsltv ctx senses basvogiow atte eacansecaueesedvas acres oeeseatecsemav an 5 Capacities-Furnace Airflow Data 0.0... ceecceesssecesseeeeeeceeeneeeesaeeesaeeeeaaeesesaeeeseeeeeaeeseneeeeeeees 6-7

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Installation: [REQUIFCIMGINGS 2: .icc50 ce sisec ccc cseseccene cee wed seesnccen su ceetaesceeaceexsecencastuscterescacueesctuccbevescaeecvees 8-9

Supply Air Plenum Installation ...........:ccccescceeseeeeeeeeeeseeeeseeeeeeeeeesseeeeneeeeeeeeeesseeesneenesseeeeseeeeeseeeeesenees 10 Installation On a Concrete Slab oe. cece cecceesceeceeeeeeeeeeceeeeeeeeeeeaeeeeeeeeseeeeeeeaeeseeaeeeeeeeeeas 10 Installation On a Combustible FlOOM ....... eee eceeeeeceeeeeeseeeeeeeeeeseeeeeeeeeeseeeeesesaeeeeaeeseaeeseaeeeeeas 10

Venting and Combustion Air Requirement .............::cceseecseceeseeeeeeeneeseeeeneeneeneneesseeeeneeeeeseneeesenees 11 GO Mera oerdceissiedvncedanetecteevsanutae Sienna daaesate vacated aecaee aueinecetccse hae uieaeenidaraheacindieiees 11 Installation in an Unconfined Space .........eccceeccesenceeeeeeeeeneeeseeeeeeeeeeseeeeseeeeseeeeeseaeeseeereees 11 Installation: ina: ComfinGd SPA Ce: yes ccseccacssdeees scvsendysesdeceeevsheecustydyegeeer syeenesty ltueeaerseanebeetayensces 12

Horizontal Furnace Installation ..........cceccecseceseeeeeeeeeeneeeceeeeeeeeseaeeseaeeeeeaeeseaeeseeeeeees 12 PAIE ERO RIV VIS IG Gis: os ict ance akec eu atad vane ctickes du aeac edna ct sac aaatee ces asain avaatal dee aatndengetataaeeaeed ee 13 Outdoor Air Using Vertical DUCtS 20.0... ccc eeeeceeeneeceneeeeeeeeeeaeeceaeeeeeaeeseaaeeeeaeeeeeeeeeaeeees 13 Air Directly Through an Exterior Wall .........ccecceeecceeeceesereeeeeeeeeeeeeesenaeeeeaeeeeeaeeseaeeeeeaes 13 Outdoor Air Using A Crawl Space and Ventilated Attic ...........0..:ccceeeeeeeeeeeeeeeeeees 14 Outdoor Air Through Horizontal Ducts 0.0.0... cece eeeeeeeeeeeeeeneeceeeeeeaeeeeaeeseaeeeeeeeeenaeeees 14

Venting REQUIFEMOIS .icuccceciiesiccenticccecccecnte cen cceecececeneceeencctensteceedceeesiedes siceesiteessnecesittenstieessnecersteees 14 GOMel al sccsoretcnct erence cines ctunld ines heoel inenlaaorehoeatensnmsioeedeteaietenieandins paar 14 Category | - COMMON VENTING ......... ceeeeceeeceeeeeeeeneeceaeeeeeaeeceaaeeeeaeeeesaeeseaeeeeeaeeseaeeeeieeeenaeeees 15 Category III - Horizontal Venting ........... eee ceeesceceseeeeeneeeesaeeceaeeeeeaeeceaaeeseaeeeeaaeeseaeeeseaeeseaaeees 16

Horizontal Venting for Upflow Models ..........cccceceseeeeeeeeeeeeeceeeeeeneeceaeeeeaeesenaeeseeereees 16 Horizontal Venting for Downflow Models .............::scceeseeceeeeeeeeeeeeaeeceaeeeeeneesenaeeeeneeenas 17 Horizontal Power Venting ........::cceccceceeeeeeeeeeeeeeeceeeeeeeeeeceeaeeeeaeeeesaeeseaeeeseaeesesaeseeaeesenaeesnteeeeas 18 Vent Termination Clearance is cictivtcnssoossevoet eiatiesoeeseteet sgnee une gure raeeelenaee neon eeaeeee 19 Location of Outdoor Terminations ............cceecceeeeeceeneeeeneeeeeeeceeeeeeeaeeseaaeeceaeeeeeaeesesaeeeeatesenas 20 Horizontal: Installation. ccctitiiscceavinctcagal stovundtenie domaedtevuntanecsaaadicvnedeceesdosecieiaeiegeedmeunnd 20 Flexible Vent SYSIOMS seccicecasseccsscevauds stacsecriscevandanrouasntsSencagdede teat aenenrtadetvoeth dadvnets Pevearnannte edt 21

Circulating) Air SUpply ---ccciscccistecces cece cet teeensccenceceeneteeeecctenc nce eneceecustreceseenencceueceeensecenenedsunseeeneseees 21 GOMe lal. cis ivesssevnsnataOiaes evra easib umn dvdeer tema davnaee auearrerdstas dealieeeeasaartaaadaeiias 21 PRO TUNICA east ada sashes Uren reed ed anteeeran aaa ct waits ad aaah ch Witacadant idpaklcch wuatidaierefeds detnniviratsanicne(ndceiaacina 21

Gas Supply and Piping ie ivseccccces ese cesccedsecceseceedeneces stgessceessncedsectenvecexsduuesie cued secevedeaesvestedeeden suedsdveieyis 22 GOMOM Al eticices teacnevecensdediG adds vegan gitdseG cdsndhegss vied ss teesnghikes votasvandand acs vidas yaead dl caees Ddensieaceecase tales 22 LG ak GO CK tat tai enact ager tosis casei stance acetic panact Guus casted cansceatuie cause naaid penta sagudenane pants aaauecaast naeas cs 22 COMVGSY SION sco, tose docnedcoslea dean eveatnvetionl ide enccinetn vans « deleeditensu dens Vetceuinechitbe ced vetted ued scot vation sce uaeeaays 23 High=Altitude Application ci..ccccccscscecsacetseecdeesteneenseteedcetuereedsnteedertornsteededtnedervcnuntendedeneeendcneers 23 Natural Gas High Altitude ConverSion ..........::ccccsceceseeeeeeeeeeneeeceeeeeeeaeesesaeeeeeeeeeeaeeseaeeeeneeeenas 23 LP/Propane Gas Sea Level and High Altitude Conversion .............ececcesseeeeeeeeeeteeeeees 23-24

Electrical: Wiring) siticccccectstedeedctetiek nec bee ccd athe cet eet ece ect heads at ecu enue Sib cab ecewses ee vacua wens cedsuenccueda weteeeeeveees 25 GOMOr all ass iootewc eects stennerseteuaseakeehveednlenersetnel endian sieeedeuale eon 25 LIME: VOI GS: WING sssesicttedaetitanctnctect. cued saueneraeuennetetseyutcaius undiaa fe vidantnereenasetutaneunavetyea atucauie 25 LOW ‘Volta 6: With AQticsetscceesndexvack aitens soncezeeet bl ctacechtascpaaundeneleadsa pease alec eet ae ee eee 26

Start-Up & AGJUStMONS unceccciccccceicccecccetie cecteeccnceence tenceteenee cececetenden cence setndsededeeenndeecendsecndcecundecencdere 27 GOMOP All ccsrncccedteeveveeansnecttere vceransteeuatoeaatd vera tates hed nteetev dee toe weap news aeeeateae 27 Slart=Up -PLOCCGULCS oes sacs accra cess teadastiens Gedehdacndsntaauceanstcenastens Ouedsctebstuteadiatodsndeathtaeseucames 27 Verifying and Adjusting Firing Rate ..........ceceecessceeeeeeenneeceneeeeeaeesesaeeeeaeeeeeaeeeeaeeeeeeeenaeeees 27 Verifying and Adjusting Temperature RiS@ ............cccececeseeeeeeeeeneeeceneeeeeaeeseaeeeeneeeeeneeeeea 27-28 Verifying: Burner :OPe ration rcceivcnce scene conc suceeknn woes cence cdcoee ecnee etait mevoes ernehenelt aecesbevameeeanensnceeere 29 Verifying Operation of Supply Air Limit Switch... eee eeeeeeeeeee centres eeeeeeaeeceeeeeeeeeenaeeees 29

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FURNACE SPECIFICATIONS - Upflow/Horizontal Models

‘ Unit Shown in Upflow << 23 3a Position Rotate 90°

FLUE j OUTLET Clockwise or Counter Clockwise for Horizontal

Application

|<—__—"9 3i4 | 3/4 —>| 3/4 [ 1

jt 25 18 } Oa

12 X 32 Cut-out for Gas Connection

|

112 X 31/2 Cut-out for

Dina Connection

oOo

IA

7/8 Cut-out for Electric 7g Cut-out for Connection Electric Connection

oOo- +

25 1/4

1 Return

Air Opening (Side)

L

11/4 » < D - =~ 11/4 14 Return Air Opening (Bottom)

~<a

Figure 1A. Upflow Unit Dimensions

FURNACE DIMENSIONS AND SHIPPING WEIGHTS

Furnace

| Ciimensions | Shipppi Model Input Weight *RA (Btuh) (in.) (in.) (in.) (in.) Note: (*) Can be C or N Table 1A. Upflow Furnace Dimensions and Shipping Weights

FURNACE SPECIFICATIONS - Downflow Models

3/4 ea ajar 23 5/8" —S 19 3/4" $e Y

24 1/2"

° Cut-ouf for Electtic Connection Both sides

25"

Cut-out for Gas Connection 1-1/2 x 3-1/2 (both sides)

(_) —«g— Cut - out for U) e Gas Connection

et 19 3/4" | +~<t—_— B Saal (Bottom Opening) (Bottom Opening)

27 7/8"

Figure 1B. Downflow Unit Dimensions

DOWNFLOW FURNACE MODELS FURNACE DIMENSIONS AND

SHIPPING WEIGHTS Model Furnace|___——sdDimensions__| Shipping

Number Input Cc Weights *RK Btuh inches Ibs

Note: (*) Can be C or N Table 1B. Downflow Furnace Dimensions and Shipping Weights

CAPACITIES —Furnace Airflow Data

aQnalforr + RIS OR

\ S :

i)

cr On

ren) trv

t+ nN

— wo

clu - O- RJD OR

-nrl[or lo o[H o

Oar re

Kn aes)

ol- om RJon OR

(uwNjoyD 49}e\, SAYdu]) unssaig Bes jeusa}Xy

KR

= Le [s) = i [s)

STAGOW AOVNENA IWLNOZIHOH/MOT4dN +08

MO] MO7-pay| «UBIH-POW « BIH MO] +x MO7-PaW yBIH-PaW, « 4BIH MOT] MO7-payl wx UBIH-P2N\

« YO!

+x WNIPS| « 4BIH axnx MOT MO7-pe|\ YBIH-PeW, wee UBIH x MOT MO7-pe|\ yBIH-PaW » 4BIH x MOT wunipe|\| + 4BIH xx MOT wunipey| + 4BIH x MOT wunipe|\| « U6IH

Lo ~~

‘N40 -9 aq ueD 4

000'rrt

000‘021

000‘021

000‘96

Furnace Airflow Data

000‘96

000°96

000'22

000'¢2

000'22

000‘09

000‘Sr

(unig) yndu|

Bunesy

002-(4)0e1

agt-(4)oz1

agt-(1)960

azi-(4)960

vzt-(4)2z0

agi-(4)220

vzel-(4)220

“Vs Jequinn

1ePo¢N

Table 2.

PEPUSLULWODOY JON - psads Buljeay jes Auojoe4 ,, pseds buljoo9 jes Auojoe4 ,

"‘PSPUSWWLUODSJ JOU 1 SUO!}I|PUOCD asoy, ‘AJUO 9OUaIIJA1 JO} BU GQ UeY} Ja}ea916 Sainssaud O1}e}S JeEUII}X9 JO} SMO|pIe PUB SASI aunyesodwa! ‘¢ “Aen Aew SOsu ainyesodws] jenjoy “ajewixosdde ae ajqQe} oy} Ul Sas aunyesodwea| “Z

*(S)J9}|y ULM UOITeJOdO JO} SI BYE “SUONOO9UUOD IIe UINJAJ OM) A4IND|J BJOW JO WD OOS] JO Sayed MOWHIVY “| :SSLON ‘N40 .9 9q URD } = O9El = OZEL = osel : O6El = SOvl OZ Slvl OZ Serl 69 Oerl MO1 s9 ossl v9 OZSI €9 ossl £9 S8sl €9 0091 eg OL9L (Ae) 0z9l 19 O€9t MO1-04W 000‘SEL SS Orel vS 098t €S OZ81 €S SZ8b €S 0681 es 0061 es Ol6L 1S 0261 ve «+HOIH-GAW aoz-(4)ser vv leleiarg ev cee ev Ove? ov ogee 44 Glee 4 S8ee 4 S6Ec ly Ove +HOIH 29 O9El 99 OZEL 99 Osel so O6EL v9 SOvl v9 Slvk v9 Sevl €9 oerl MOT 8S ossl 8S OZSI 2g osst 2g Ses} 2g 0091 9S OL9l 9S 0291 9S Oegl »MOTCAWN 000021 6p Orel 6p o98l 8v OZ81 8r SZ8L 8P 0681 8P 0061 lv O16L Lv 0z61 vie |HOIH-GaW a02-(4)0z1 = (elelore = cee = Ove? > ogee = Glee * gee > S6Ec * Ove «HOIH OLOL OL OEOl 89 0901 29 0801 s9 OLLL v9 Ovit CAS] SOLL 19 Ostt MO1 09 0021 6S Oe?t 8S osel 2S SZek 9S SOEl vS Geel €S O9El €S GZEL ««MOTCAN 000‘96 agt-(+)960 1S Oerl os osrl 6y OZvL 8r S6rl 87 Sesh Lv SSSI ov O8st Sv 0091 2e/t HOIH-dAaW ev OOZ1 ov OeZt LY OLZL Ov Sosl = Sesl . s98l = 0681 = OS61 «HOIH = 069 = OZ = 022 = sez : SGZ = OLL = Sez 2 S6Z MO1 s9 OLLE s9 OZ t v9 OviL £9 Slt eo SOL 19 Ostt 19 S6LL 09 0021 e/t «NNIGAW 000‘96 azt-(4)960 €S O9E1 es Osel es oorl 1S Olt LS Oerl 0s Srrl os o9rl 6v SZvl xHOIH 09 O16 8S 06 8S Ove 2g SS6 9S SZ6 ss S66 vS OLOL €S 0201 «MOT os 0601 6v OLLE 6p OZtL 8r Ovit Lv O9tt ov O8tt Sv S6LL Sv Olet MO1-04N 000‘%2 ly OZEl ly OvEl Ov O9el 6€ Osel 6€ oorl 8€ Ocrl 8e Serl = o9rl e/t HOIH-daW agt-(4)220 ig osgol - os9gl = OOZI 2 SeZh 7 SSZL .: SZLL = O6Z1 2 ossl «HOIH eZ osz IZ 092 IZ OLL OZ 082 89 S6Z 29 S08 29 018 s9 oes «MOT vS OLOL es OvOl IS 0901 os 0801 6v OLLE 87 OElt Lv SvLt ov Ostt g/t Wnidaw 000'%2 vai-(4)220 6v OZ E Lv O9LL ov O6LL > Oech = o9gcl * Oeel > SVEL = O8el xHDIH 09 osz 09 092 6S OZZ 8S 082 ZS S62 9S S08 9S 018 gs oes xxMOT Sv OLOL 44 OvOl ev 0901 ov osol ly OLLE Ov OElt Ov Svil 8€ O8tt g/L WnIdaW 000‘09 vat-(4)090 Ov OZLI 6€ O9Lt 8€ O6LL Ze lelaral 9€ o9zl = Oeel iy SVEL = O8el «HOIH 8sly Ws49 8sly W499 8sly W449 8sly W490 8sly W490 8sly W490 8sly W499 8sly WA dH qaads LNdNI ds 80 20 90 s0 v0 £0 20 xe) YOLOW YOLOW ONILVAH Y3AagWNN NWA109 YALVM AO SSHONI) SYNSS3Yd OILVLS TWNYALXS 7gq0N

STAGOW ADVNYNA MOTANMOC +08

Furnace Airflow Data

Table 2A.

SAFETY INFORMATION

1. Use only with type of gas approved for this furnace. Refer to the furnace rating plate.

2. Install this furnace only in alocation and position as specified on Table 3 of these instructions.

3. Provide adequate combustion and ventilation air to the furnace space as specified on Pages 11 through 18.

4. Combustion products must be discharged outdoors. Connect this furnace to an approved vent system only, as specified on Pages 14 through 18.

5. Nevertestforgasleaks with an open flame. Use a commercially available soap solution made specifically for the detection of leaks to check all connections, as specified on Page 21 of these instructions.

6. Always install furnace to operate within the furnace’s intended temperature-rise range with a duct system which has an external static pressure within the allowable range, as speci- fied on Table 2 of these instructions. See furnace rating plate.

7. Whena furnace is installed so that supply ducts carry air circulated by the furnace to areas outside the space containing the furnace, the return air shall also be handled by duct(s) sealed to the furnace casing and terminating outside the space containing the furnace.

8. A gas-fired furnace for installation in a residential garage must be installed as specified on Page 9 of these instructions.

9. The furnace is not to be used for temporary heating of buildings or structures under con- struction.

INSTALLATION REQUIREMENTS

Requirements and Codes

This furnace must be installed in accordance with these instructions, all applicable local build- ing codes, current revision of the National Fuel Gas Code (ANSI-Z223.1), and in Canada with the CAN/CGA - B149 installation code. The current revision of the National Fuel Gas Code is available from:

American National Standards Institute, Inc.

14380 Broadway New York, New York 10018

Additional helpful publications are: NFPA-90A - Installation of Air Conditioning and Ventilating Systems

NFPA-90B - Warm Air Heating and Air Conditioning Systems

These publications are available from: National Fire Protection Association, Inc. Batterymarch Park Quincy, Massachusetts 02269

/\ WARNING:

This furnace is not approved for installa- tion in mobile homes. _ Installation in a mobile home could cause fire, property damage, and/or personal injury.

Location

Upflow gas furnaces are shipped ready for installation in the upflow or horizontal right or left positions. The *RK gas furnace is for downflow operation only. The furnace must be installed on a level surface, located as close to the vent (or chimney) and as close to the center of the air distribution system as possible. See Table 1 for overall dimensions to determine the required clearances in hallways, doorways, stairs, etc. to allow the furnace to be moved to the instal- lation point. The furnace must be installed so that all electrical components are protected from water. The furnace must be installed upstream from a refrigeration system. This furnace is not to be used for temporary heating of buildings or structures under construction.

Clearances to Combustibles

This furnace is Design Certified by CSA Inter- national for the minimum clearances to com- bustible material listed in Table 3. Refer to the furnace rating plate, located inside of the fur- nace cabinet, for the specific model number and clearance information.

Access for positioning and servicing the unit must be considered when locating unit. 24 inches is the minimum required clearance from the front of the unit for servicing it. 30 inches is the minimum required clearance from the front of the unit for positioning it. 36 inches is the recommended clearance from the front of the unit. Please note that a panel or door can be located such that the minimum clearance on the rating plate is satisfied, but that panel or door must be removable and allow the appropriate clearance for your installation.

This furnace is certified for use on wood floor- ing. This furnace must not be installed directly on carpeting, tile, or any combustible material other than wood flooring.

Downflow Warning (*RK Models):

The design of the downflow furnace is certified for natural or propane gas and for installation on non-combustible flooring. A special combus- tible floor sub-base is required when installing onacombustible floor. Failure to install the sub- base may result in fire, property damage and personal injury. The special downflow sub- bases are factory supplied accessories, part number 904165. When the furnace is installed on a factory or site-built cased air conditioning coil, the sub-base is not necessary. However,

Upflow Furnace Models

UPFLOW APPLICATION

BOTTOM

INSTALLATION CLEARANCES

Vent Connector | Standard Single Type B-1 Double Type Wall Metal Vent Wall Metal Vent

LEFT SIDE RIGHT SIDE

For Downflow furnace installations only, furnace mustbe installed on non-combustible flooring.

Allow 24" minimum clearance for servicing. The

recommended clearance is 36".

the plenum attached to the coil casing must be installed such that its surfaces are at least 1" from combustible construction.

/\ CAUTION:

The downflow sub-base must not be installed directly on carpeting, tile, or any combustible material other than wood flooring.

HORIZONTAL APPLICATION

nnn

SIDE

Downflow Furnace Models

TOP

BOTTOM

Table 3. Minimum Clearances to Combustible Material

A gas-fired furnace installed in a residential Supply Air Plenum Installation garage must be installed so the burners and the

igniter are located not less than 18 inches (457 —A_._ Installation on a concrete slab. - *RK

mm) above the floor, and the furnace must be 1. Construct a hole in the floor per the located or protected to avoid physical damage dimension in Figure 2. by vehicles. 2. Place the plenum and the furnace as

shown in Figure 3.

/\ WARNING: B. Installation on a combustible floor. - *RK

For downflow furnace installation, this fur-

Do not place combustible material on or nace is approved for use on combustible against the furnace cabinet or within 6 flooring when NORDYNE combustible floor inches of the vent pipe. Do not place sub-base kit #904165 is used. combustible materials, including gaso- 1. Cut hole and frame the hole per the line and any other flammable vapors and dimensions in Figure 4.

liquids, in the vicinity of the furnace. 2. Install the sub-base according to the

installation instructions. (See Figure 5)

Downflow Sub-base Furnace

*RK 072-16; 096-12; *RK 060-12: 096-16; 120-20 072-12 z 135-20; ! eee Metal Plenum

Figure 2. Opening for Concrete Slab

Concrete Furnace Floor Figure 5. Downflow Sub-Base Dimensions

Furnace

Coil Wood Assembly Floor

Sheet Metal Plenum Minimum *RK 072-16; *RK 060-12; 096-12; 096-16; 072-12 Figure 6. Furnace with Coil Assembly on

120-20; 135-20 a Wood Floor

Figure 4. Opening in Wood Floor

10

3. When the furnace is installed on a fac- tory or site-built cased air conditioning coil, the sub-base is not necessary. However, the plenum attached to the coil casing must be installed such that its surface is at least 1” from combustible material in Figure 6.

VENTING AND COMBUSTION AIR REQUIREMENTS

General

Provisions must be made in the installation of this furnace to provide an adequate supply of air for combustion. Detailed instructions for deter- mining the adequacy of an installation can be found in the current revision of the National Fuel Gas Code (ANSI 2223.1 / NFPA54) or in appli- cable local building codes. Consult local codes for special requirements. For Cana- dian installations consult Canadian Installations Codes and (CAN/CGA B149.1 or .2).

If the furnace is operated with inadequate air for combustion one of the flame roll-out switches located in the burner compartment or the vent switch will open, turning off the gas supply to the burners. These safety devices are manually reset switches. DO NOT install jumper wires across these switches to defeat their function. DO NOT reset a switch without identifying and correcting the fault condition. Ifa switch must be replaced, use only the correct part specified in the Replacement Parts List.

Air openings in the furnace door, warm air registers, and return air grilles must not be restricted.

Combustion Air Quality To maximize heat exchanger life, the combus- tion air must be free of chemicals which form corrosive acidic compounds in the combustion gases. The recommended source of combus- tion air is to use the outdoor air supply. How- ever, the use of indoor air in most applications is acceptable except as follows:

1. Ifthe furnace is installed in a confined space it is recommended that the necessary combus- tion air come from the outdoors by way of attic, crawl space, air duct, or direct opening.

2. lfoutdoorcombustion air is used, there must be no exposure to the installations or substances listed in Item 3 below.

3. The following types of installation may require

Outdoor Air for combustion, due to chemical

exposures:

* Commercial buildings

¢ Buildings with indoor pools

¢ Furnaces installed in laundry rooms

e Furnaces installed in hobby or craft rooms

¢ Furnaces installed near chemical storage areas

Exposure to the following substances in the

combustion air supply may also require Out-

door Air for combustion:

« Permanent wave solutions

¢ Chlorinated waxes and cleaners

¢ Chlorine based swimming pool chemicals

¢ Water softening chemicals

¢ De-icing salts or chemicals

* Carbon tetrachloride

¢ Halogen type refrigerants

* Cleaning solvents (such as perchloroethyl- ene)

e Printing inks, paint removers, varnishes, etc.

¢ Hydrochloric acid

* Cements and glues

e Antistatic fabric softeners for clothes dryers

¢ Masonry acid washing materials

/\\. CAUTION:

Combustion air must not be drawn from a corrosive atmosphere.

/\ WARNING:

Furnace installation using methods other than those described in the following sections must comply with the National Fuel Gas Code and all applicable local codes to provide sufficient combustion air for the furnace.

Installation In An Unconfined Space

An unconfined space is an area including all rooms not separated by doors with a volume greater than 50 cubic feet per 1,000 Btuh of the combined input rates of all appliances which draw combustion air from that space. For example, aspace including a water heater rated at 45,000 Btuh input and a furnace rated at 75,000 Btuh requires a volume of 6,000 cubic feet [50 x (45 + 75) = 6,000] to be considered unconfined. If the space has an 8 foot ceiling, the floor area of the space must be 750 square

11

feet (6,000 / 8 = 750). In general, a furnace installed in an unconfined space will not require outside air for combustion. However, in “tight” buildings (with weather stripping and caulk to reduce infiltration), it may be necessary to provide outside air to ensure adequate com- bustion and venting, even though the furnace is located in an unconfined space.

Installation In A Confined Space

A confined space is an area with volume less than 50 cubic feet per 1,000 Btuh of the com- bined input rates of all appliances drawing combustion air from that space. Furnace clos- ets, small equipment rooms and garages are confined spaces. Furnaces installed in a con- fined space which supply heated air to areas outside the space must draw return air from outside the space and must have the return air ducts tightly sealed to the furnace. A confined space must have two openings into the space for combustion air. One opening must be within 12 inches of the ceiling, and the other must be within 12 inches of the floor. The required sizing of these openings is determined by whether inside or outside air is used to support combustion, the method by which the air is brought to the space, and by the total input rate of all appliances in the space.

Horizontal Furnace Installation

The *RA series furnaces can be installed hori- zontally in an attic, basement, crawl space or alcove. Itcan be suspended from a ceiling ina basement or utility room in either a right to left airflow or left to right airflow. (See Figures 7 and 8.)

If the furnace is to be suspended from the ceiling, it will be necessary to use steel straps around each end of the furnace. These straps should be attached to the furnace with sheet metal screws and to the rafters with bolts. The furnace could also be suspended by an angle iron frame bolted to the rafters. (See Figure 7.)

Access for positioning and servicing must be considered when locating the unit. Refer to Table 3, Minimum Clearances to Combustible Material, for clearance specifications.

Keep all insulating materials away from the louvered door. Insulating materials may be combustible.

The *RA series furnace may be installed di- rectly on combustible wood flooring or sup- ports, if type "B-1" vent pipe is used (See Figure 8). It is recommended for further reduction of fire hazard that cement board or sheet metal be placed between the furnace and the combus- tible floor and extend 12 inches beyond the front of the louvered door.

/A\ WARNING:

Furnaces installed with combustion air drawn from a heated space which in- cludes exhaust fans, fireplaces, or other devices that may produce a negative pressure should be considered con- fined space installations.

MITT

| |

Figure 7. *RA Horizontal Installation Suspended in Attic or Crawl Space

Note: Line

Contact is Permissible Gas Inlet

Type “B” Vent ———

\_______ Combustible

Platform

Coil Plenum

Bees Louver Door Connection Figure 8. *RA Horizontal installation on a Platform

See the venting section for venting guidelines and specifications.

Air From Inside (See Figure 9)

If combustion air is taken from the heated space, the two openings must each have a free area of at least one square inch per 1,000 Btuh of total input of all appliances in the confined space, but not less than 100 square inches of free area. For example, if the combined input rate of all appliances is less than or equal to 100,000 Btuh, each opening must have a free area of at least 100 square inches. If the combined input rate of all appliances is 120,000 Btuh, each opening must have a free area of at least 120 square inches.

Openings to adjacent space. Each opening must be at least 100 sq. in. or 1 sq. in. per 1000 Btuh of total input rating, whichever is greater. See minimum area per table. —

Sion Max. ¥

= a) Furnace a El

Oo I Ty

Water Heater

Minimum Total Input Free Area Rating (Btu/hr) (Each Opening) 40,000 100 sq. in. 60,000 100 sq. in. 80,000 100 sq. in. 100,000 100 sq. in. 120,000 120 sq. in. 140,000 140 sq. in. 160,000 160 sq. in.

Figure 9. Equipment in a Confined Space with all Combustion Air Drawn from the Inside

Round Duct Diameter

Ventilation Louvers at

A Cee each end of attic [| a Outlet Air Duct must be at least 1 sq. in. per 4,000 Btuh of total input rating. a Inlet and Outlet i Ducts must

extend above ry attic insulation.

Attic Insulation 77

a Pas

\— Water Heater

Inlet Air Duct must

be at least 1 sq. in.

per 4,000 Btuh of

| 2—~“‘total input rating.

a. All Combustion Air from Ventilated Attic. Minimum

Free Area Round Duct (Each Opening)

Diameter

Total Input Rating (Btu/hr) 40,000 10 sq. in. 60,000 15 sq. in. 80,000 20 sq. in.

100,000 120,000 140,000

25 sq. in. 30 sq. in. 35 sq. in. 160,000 40 sq. in.

Figure 10. Equipment in a Confined Space with all Combustion Air Drawn from the Outside through Vertical Ducts

Outdoor Air Using Vertical Ducts

(See Figure 10)

If combustion air is taken from outdoors through vertical ducts, the openings and ducts must have a minimum free area of one square inch per 4,000 Btuh of total appliance input. In instal- lations drawing combustion air from a ventilated attic, both air ducts must extend above the attic insulation.

If the unit is installed in an area with an exhaust fan, provide sufficient ventilation to prevent negative pressures from occurring in the room.

The combustion air openings must not be re- stricted in any manner.

/\. CAUTION:

Do not supply combustion air from an attic space that is equipped with power ventilation or any other device that may produce a negative pressure.

Air Directly Through An Exterior Wall (See Figure 11)

Vent or Chimney

Each opening to outside must be at least

1s 7 Btuh of total input rating.

Furnace

U

ier Max _ Water Heater Minimum Free Area Round Duct Rating (Btuh) (Each Opening) Diameter 40,000 10 sq. in. 4" 60,000 15 sq. in. " 80,000 20 sq. in. 100,000 25 sq. in. 120,000 30 sq. in. 140,000 35 sq. in. 160,000 40 sq. in.

Total Input

Figure 11. Equipment in a Confined Space with all Combustion Air Drawn from the Outside through Exterior Wall

13

If combustion air is provided directly through an exterior wall, the two openings must each have free area of at least one square inch per 4000 Btuh of total appliance input.

Outdoor Air Using a Crawl Space and Ventilated Attic (See Figure 12)

When directly communicating with the out- doors, each opening shall have a minimum free area of 1 square inch per 4,000 Btuh of total appliance input. The openings shall communi- cate directly, or by ducts, with the outdoor spaces (crawl or attic) that freely communicate with the outdoors.

Outdoor Air Using Horizontal Ducts (See Fig- ure 13)

If combustion air is taken from outdoors through horizontal ducts, the openings and ducts must have a minimum free area of one square inch per 2,000 Btuh of total appliance input.

If the unit is installed in an area with an exhaust fan, provide sufficient ventilation to prevent negative pressures from occurring in the room.

The combustion air openings must not be re- stricted in any manner.

VENTING REQUIREMENTS

General

This furnace must be vented in compliance with, the current revision of the National Fuel Gas Code (ANSI-Z223.1/NFPA54), with the instructions provided below.

Vent or Ventilation Louvers at

“7 Chimney each end of attic Cutlet Air Duct | —— must be at least 1 3 . in. per 4000 Btuh of total input

aaa rating. Must exten id Attic Ingulation above attic insulation.

Water Heater,

Inlet Air Duct must

Oo IC

_— Ventilation Louvers for

unheated crawl space Crawl Space

Figure 12. Equipment in a Confined Space with All Combustion Air Drawn from a Crawl Space and Ventilated Attic

In Canada, venting shall conform to the require- ments of the current (CAN/CGA B149.1 or .2) installation codes. Consult local codes for special requirements.

For Category | furnace installations, the fur- nace shall be connected to a factory built chimney or vent complying with a recognized standard, or a masonry or concrete chimney lined with a lining material acceptance to the authority having jurisdiction. Venting into an unlined masonry chimney or concrete chim- ney is prohibited.

This furnace must never be vented to a chim- ney flue servicing a fireplace or other appliance designed to burn solid fuel. If the furnace vent is to be connected to a chimney serving a fireplace, the fireplace must be sealed off from

Vent or

<7 Chimney,

Each (opening to outside must be at least . in. per 2000 un of total input ing.

FE] Air Duct

. fam i

‘Water Heater

E] Air Duct

Minimum

input Free Area Round Duct

Rae (Btu/hr) (Each Opening) Diameter 40,000 20 sq. in. ” 60,000 30 sq. in. 80,000 40 sq. in. 100,000 50 sq. in. 120,000 60 sq. in. 140,000 70 sq. in. 160,000 80 sq. in.

Figure 13. Equipment in a Confined Space with all Combustion Air Drawn from the Outside

through Horizontal Ducts

Pressure Switch

-— Bleed Tube

Bleed Tube

Orifice - Pres: switch operat at high altituc can be made responsive b)

Sensor Tubes

covering blee orifice

Collector

c Pan

*RA Bleed Tube Installation

Figure 14.

the chimney. Single wall metal vents shall not be used for Category | venting, Category | fur- naces must be vented vertically or near verti- cally.

The furnace vent, if metal, may be insulated if local codes allow. Any part of the vent system, metal vent only, not exposed to weather, but which are exposed to ambient temperatures below 35° F must be insulated to prevent con- densation. Allventinsulation shall be foil backed fiberglass of one inch minimum thickness.

Three sheet metal fasteners (field supplied)

Category I - Common Venting

When an existing furnace is removed from a venting system serving other appliances, the venting system is likely to be too large to properly vent the remaining appliances. An improperly sized venting system can result in the formation of condensate, leakage, spillage, etc.

The steps outlined in the warning below shall be followed with each individual appliance con- nected to the vent system placed in operation, while all other appliances connected to the vent system are not in operation:

should be used to secure the vent pipe to the furnace flue. These fasteners should be evenly spaced around the flue diameter, if possible.

/\ WARNING: CARBON MONOXIDE POISONING HAZARD

Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon monoxide poisoning or death.

The following steps shall be followed for each appliance connected to the venting system being placed into operation, while all other appliances connected to the venting system are not in operation:

1. Seal any unused openings in the venting system.

2. Inspect the venting system for proper size and horizontal pitch, as required in the National Fuel Gas Code, ANSI 2223. 1/NFPA 54 or the CSA B149.1, Natural Gas and Propane Installation Codes and these instructions. Deter- mine that there is no blockage or restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition.

As far as practical, close all building doors and windows and all doors between the space in which the appliance(s) connected to the venting system are located and other spaces of the building.

Close fireplace dampers.

Turn on clothes dryers and any appliance not connected to the venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they are operating at maximum speed. Do not operate a summer exhaust fan.

Follow the lighting instructions. Place the appliance being inspected into operation. Adjust the thermostat so appliance is operating continuously. Test for spillage from draft hood equipped appliances at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a match or candle.

If improper venting is observed during any of the above tests, the venting system must be corrected in accordance with the National Fuel Gas Code, ANSI 2223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane Installa- tion Codes.

After it has been determined that each appliance connected to the venting system properly vents when tested as outlined above, return doors, win- dows, exhaust fans, fireplace dampers and any other gas-fired burning appliance to their previous conditions of use.

15

The venting system should be designed to have the minimum number of elbows or turns. All horizontal runs shall be sloped upwards from the furnace at 1/4 inch per running foot of vent. Supports for the vent pipe must be installed a minimum of every five feet along the vent run to ensure no displacement after instal- lation.

Under no circumstances shall any portion of the vent system extend into or pass through any return air duct, supply air duct, or plenum.

If the furnace is operated with blocked or restricted venting, the blocked vent switch located in the vent plate will open, turning off the gas supply to the burners. The blocked vent switch is a manually reset device. DO NOT install a jumper wire across this switch to defeat its function. DO NOT reset the switch without identifying and correcting the fault condition which caused the switch to trip. If this switch must be replaced, use only the part specified in the Replacement Parts List.

/\\ WARNING:

Upon completion of the furnace installa- tion, carefully inspect the entire flue sys- tem both inside and outside the furnace to assure it is properly sealed. Leaks in the flue system can result in serious personal injury or death due to exposure of flue products, including carbon mon- oxide.