Trane S8B1B080M4PSBA Service manual

SSAAFFEETTYY WWAARRNNIINNGG
Only qualified personnel should install and service the equipment The installation, starting up, and servicing of heating, ventilating, and air-conditioning
equipment can be hazardous and requires specific knowledge and training Improperly installed, adjusted or altered equipment by an unqualified person
could result in death or serious injury When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that
are attached to the equipment
November 2020 SS88XXBB--SSFF--22BB--EENN
Upflow/Downflow/Horizontal
Gas-Fired, 1–Stage and 2–Stage Induced Draft Furnaces with
High fficiency Motor
UUppffllooww,, DDoowwnnffllooww,, HHoorriizzoonnttaall RRiigghhtt//LLeefftt
Single Stage Two Stage
S8B1
S8X1
S8X2
S8B1B080M4PSBA
S8B1D120M5PSBA
S8X1B080M4PSBA
S8X1D120M5PSBA
S8X2B080M4PSBA
S8X2D120M5PSBA
NNoottee:: Models may have a “T” in the 12th digit designating they meet California
less than 40 ng/J (NO ) emissions requirements.
NNoottee:: Graphics in this document are for
representation only. Actual model may
differ in appearance.
S8XB-SF-2B-EN
Service Facts

©2020 S8XB-SF-2B-EN
SAF TY S CTION NON-COND NSING FURNAC S
IImmppoorrttaanntt:: — This document pack contains a wiring
diagram and service information. This is
customer property and is to remain with
this unit. Please return to service
information pack upon completion of work.
WWAARRNNIINNGG
FFIIRREE OORR EEXXPPLLOOSSIIOONN HHAAZZAARRDD!!
Failure to follow safety warnings exactly
could result in a fire or explosion causing
property damage, personal injury or loss
of life.
—— DDoo nnoott ssttoorree oorr uussee ggaassoolliinnee oorr ootthheerr
ffllaammmmaabbllee vvaappoorrss aanndd lliiqquuiiddss iinn tthhee vviicciinniittyy ooff
tthhiiss oorr aannyy ootthheerr aapppplliiaannccee —— WWHHAATT TTOO DDOO IIFF
YYOOUU SSMMEELLLL GGAASS
•• DDoo nnoott ttrryy ttoo lliigghhtt aannyy aapppplliiaannccee
•• DDoo nnoott ttoouucchh aannyy eelleeccttrriiccaall sswwiittcchh;;ddoo nnoott uussee
aannyy pphhoonnee iinn yyoouurr bbuuiillddiinngg
•• IImmmmeeddiiaatteellyy ccaallll yyoouurr ggaass ssuupppplliieerr ffrroomm aa
nneeiigghhbboorr’’ss pphhoonnee FFoollllooww tthhee ggaass ssuupppplliieerr''ss
iinnssttrruuccttiioonnss
•• IIff yyoouu ccaannnnoott rreeaacchh yyoouurr ggaass ssuupppplliieerr,, ccaallll
tthhee ffiirree ddeeppaarrttmmeenntt
—— IInnssttaallllaattiioonn aanndd sseerrvviiccee mmuusstt bbee ppeerrffoorrmmeedd bbyy
aa qquuaalliiffiieedd iinnssttaalllleerr,, sseerrvviiccee aaggeennccyy,, oorr tthhee ggaass
ssuupppplliieerr
WWAARRNNIINNGG
EEXXPPLLOOSSIIOONN HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, ppeerrssoonnaall iinnjjuurryy oorr ddeeaatthh
IInnssttaallll aa ggaass ddeetteeccttiinngg wwaarrnniinngg ddeevviiccee iinn ccaassee ooff aa
ggaass lleeaakk NNOOTTEE:: TThhee mmaannuuffaaccttuurreerr ooff yyoouurr ffuurrnnaaccee
ddooeess nnoott tteesstt aannyy ddeetteeccttoorrss aanndd mmaakkeess nnoo
rreepprreesseennttaattiioonnss rreeggaarrddiinngg aannyy bbrraanndd oorr ttyyppee ooff
ddeetteeccttoorr..
WWAARRNNIINNGG
FFIIRREE OORR EEXXPPLLOOSSIIOONN HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhee ssaaffeettyy wwaarrnniinnggss eexxaaccttllyy ccoouulldd
rreessuulltt iinn sseerriioouuss iinnjjuurryy,, ddeeaatthh,, oorr pprrooppeerrttyy
ddaammaaggee
NNeevveerr tteesstt ffoorr ggaass lleeaakkss wwiitthh aann ooppeenn ffllaammee UUssee aa
ccoommmmeerrcciiaallllyy aavvaaiillaabbllee ssooaapp ssoolluuttiioonn mmaaddee
ssppeecciiffiiccaallllyy ffoorr tthhee ddeetteeccttiioonn ooff lleeaakkss ttoo cchheecckk aallll
ccoonnnneeccttiioonnss AA ffiirree oorr eexxpplloossiioonn mmaayy rreessuulltt
ccaauussiinngg pprrooppeerrttyy ddaammaaggee,, ppeerrssoonnaall iinnjjuurryy,, oorr lloossss
ooff lliiffee
WWAARRNNIINNGG
EELLEECCTTRRIICCAALL SSHHOOCCKK,, FFIIRREE,, OORR
EEXXPPLLOOSSIIOONN HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
ddaannggeerroouuss ooppeerraattiioonn,, pprrooppeerrttyy ddaammaaggee,, sseevveerree
ppeerrssoonnaall iinnjjuurryy,, oorr ddeeaatthh
IImmpprrooppeerr sseerrvviicciinngg ccoouulldd rreessuulltt iinn ddaannggeerroouuss
ooppeerraattiioonn,, pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall
iinnjjuurryy,, oorr ddeeaatthh
•• BBeeffoorree sseerrvviicciinngg,, ddiissccoonnnneecctt aallll eelleeccttrriiccaall
ppoowweerr ttoo ffuurrnnaaccee
•• WWhheenn sseerrvviicciinngg ccoonnttrroollss,, llaabbeell aallll wwiirreess pprriioorr
ttoo ddiissccoonnnneeccttiioonn RReeccoonnnneecctt wwiirreess ccoorrrreeccttllyy
•• VVeerriiffyy pprrooppeerr ooppeerraattiioonn aafftteerr sseerrvviicciinngg
WWAARRNNIINNGG
CCAARRBBOONN MMOONNOOXXIIDDEE PPOOIISSOONNIINNGG
HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
TToo eennssuurree ffuurrnnaaccee iiss vveenntteedd pprrooppeerrllyy,, ddoo nnoott
rreeppllaaccee ffaaccttoorryy ssuupppplliieedd vveennttiinngg ccoommppoonneennttss wwiitthh
ffiieelldd ffaabbrriiccaatteedd ppaarrttss FFaabbrriiccaattiinngg ppaarrttss ccaann rreessuulltt
iinn ddaammaaggeedd vveennttss aanndd ccoommppoonneennttss aalllloowwiinngg
ccaarrbboonn mmoonnooxxiiddee ttoo eessccaappee tthhee vveennttiinngg ssyysstteemm
WWAARRNNIINNGG
CCAARRBBOONN MMOONNOOXXIIDDEE HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
WWhheenn rreeppllaacciinngg aa ffuurrnnaaccee,, eennssuurree tthhee vveennttiinngg
ssyysstteemm iiss aaddeeqquuaattee ffoorr tthhee nneeww ffuurrnnaaccee
WWAARRNNIINNGG
FFIIRREE HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
DDoo nnoott iinnssttaallll tthhee ffuurrnnaaccee ddiirreeccttllyy oonn ccaarrppeettiinngg,, ttiillee
oorr ootthheerr ccoommbbuussttiibbllee mmaatteerriiaall ootthheerr tthhaann wwoooodd
fflloooorriinngg FFoorr vveerrttiiccaall ddoowwnnffllooww aapppplliiccaattiioonnss,,
ssuubbbbaassee ((BBAAYYBBAASSEE220055)) mmuusstt bbee uusseedd bbeettwweeeenn tthhee
ffuurrnnaaccee aanndd ccoommbbuussttiibbllee fflloooorriinngg WWhheenn tthhee
ddoowwnnffllooww ffuurrnnaaccee iiss iinnssttaalllleedd vveerrttiiccaallllyy wwiitthh aa
ccaasseedd ccooiill,, aa ssuubbbbaassee iiss nnoott rreeqquuiirreedd

S8XB-SF-2B-EN 3
WWAARRNNIINNGG
WWAARRNNIINNGG!!
TThhiiss pprroodduucctt ccaann eexxppoossee yyoouu ttoo cchheemmiiccaallss
iinncclluuddiinngg lleeaadd,, wwhhiicchh aarree kknnoowwnn ttoo tthhee SSttaattee ooff
CCaalliiffoorrnniiaa ttoo ccaauussee ccaanncceerr aanndd bbiirrtthh ddeeffeeccttss oorr
ootthheerr rreepprroodduuccttiivvee hhaarrmm
FFoorr mmoorree iinnffoorrmmaattiioonn ggoo ttoo wwwwww PP6655WWaarrnniinnggss ccaa
ggoovv
WWAARRNNIINNGG
EEXXPPLLOOSSIIOONN HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
PPrrooppaannee ggaass iiss hheeaavviieerr tthhaann aaiirr aanndd mmaayy ccoolllleecctt iinn
aannyy llooww aarreeaass oorr ccoonnffiinneedd ssppaacceess IInn aaddddiittiioonn,,
ooddoorraanntt ffaaddee mmaayy mmaakkee tthhee ggaass uunnddeetteeccttaabbllee
eexxcceepptt wwiitthh aa wwaarrnniinngg ddeevviiccee IIff tthhee ggaass ffuurrnnaaccee iiss
iinnssttaalllleedd iinn aa bbaasseemmeenntt,, aann eexxccaavvaatteedd aarreeaass oorr aa
ccoonnffiinneedd ssppaaccee,, iitt iiss ssttrroonnggllyy rreeccoommmmeennddeedd ttoo
ccoonnttaacctt aa ggaass ssuupppplliieerr ttoo iinnssttaallll aa ggaass ddeetteeccttiinngg
wwaarrnniinngg ddeevviiccee iinn ccaassee ooff lleeaakk TThhee mmaannuuffaaccttuurreerr
ooff yyoouurr ffuurrnnaaccee ddooeess nnoott tteesstt aannyy ddeetteeccttoorrss aanndd
mmaakkeess nnoo rreepprreesseennttaattiioonnss rreeggaarrddiinngg aannyy bbrraanndd oorr
ttyyppee ooff ddeetteeccttoorr
WWAARRNNIINNGG
EELLEECCTTRRIICCAALL SSHHOOCCKK HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
DDoo nnoott bbyyppaassss tthhee ddoooorr sswwiittcchh oorr ppaanneell lloooopp bbyy
aannyy ppeerrmmaanneenntt mmeeaannss
WWAARRNNIINNGG
EELLEECCTTRRIICCAALL SSHHOOCCKK HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
DDoo nnoott ttoouucchh aannyy ccoommppoonneennttss ootthheerr tthhaann tthhee MMeennuu
aanndd OOppttiioonn bbuuttttoonnss oonn tthhee IIFFCC wwhheenn sseettttiinngg uupp tthhee
ssyysstteemm oorr dduurriinngg ffaauulltt ccooddee rreeccoovveerryy
WWAARRNNIINNGG
FFIIRREE OORR EEXXPPLLOOSSIIOONN HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
DDoo NNOOTT aatttteemmpptt ttoo mmaannuuaallllyy lliigghhtt tthhee ffuurrnnaaccee
WWAARRNNIINNGG
CCAARRBBOONN MMOONNOOXXIIDDEE PPOOIISSOONNIINNGG
HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
FFoollllooww tthhee sseerrvviiccee aanndd//oorr ppeerriiooddiicc mmaaiinntteennaannccee
iinnssttrruuccttiioonnss ffoorr tthhee FFuurrnnaaccee aanndd vveennttiinngg ssyysstteemm
WWAARRNNIINNGG
CCAARRBBOONN MMOONNOOXXIIDDEE PPOOIISSOONNIINNGG
HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
sseerriioouuss ppeerrssoonnaall iinnjjuurryy oorr ddeeaatthh
MMaakkee ssuurree tthhaatt tthhee bblloowweerr ddoooorr iiss iinn ppllaaccee aanndd nnoott
aajjaarr DDaannggeerroouuss ffuummeess ccoouulldd eessccaappee aann
iimmpprrooppeerrllyy sseeccuurreedd ddoooorr
WWAARRNNIINNGG
EELLEECCTTRRIICCAALL SSHHOOCCKK HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
DDiissccoonnnneecctt ppoowweerr ttoo tthhee uunniitt bbeeffoorree rreemmoovviinngg tthhee
bblloowweerr ddoooorr AAllllooww aa mmiinniimmuumm ooff 1100 sseeccoonnddss ffoorr
IIFFCC ppoowweerr ssuuppppllyy ttoo ddiisscchhaarrggee ttoo 00 vvoollttss
WWAARRNNIINNGG
SSAAFFEETTYY HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
TThheessee ffuurrnnaacceess aarree nnoott aapppprroovveedd oorr iinntteennddeedd ffoorr
iinnssttaallllaattiioonn iinn mmaannuuffaaccttuurreedd ((mmoobbiillee)) hhoouussiinngg,,
ttrraaiilleerrss,, oorr rreeccrreeaattiioonnaall vveehhiicclleess
WWAARRNNIINNGG
EEXXPPLLOOSSIIOONN HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
IInn tthhee eevveenntt tthhaatt eelleeccttrriiccaall,, ffuueell,, oorr mmeecchhaanniiccaall
ffaaiilluurreess ooccccuurr,, sshhuutt ggaass ssuuppppllyy ooffff aatt tthhee mmaannuuaall
ggaass vvaallvvee llooccaatteedd oonn tthhee ssuuppppllyy ggaass ppiippiinngg ccoommiinngg
iinnttoo tthhee ffuurrnnaaccee bbeeffoorree ttuurrnniinngg ooffff tthhee eelleeccttrriiccaall
ppoowweerr ttoo tthhee ffuurrnnaaccee CCoonnttaacctt tthhee sseerrvviiccee aaggeennccyy
ddeessiiggnnaatteedd bbyy yyoouurr ddeeaalleerr
SSAAFFEETTYY SSEECCTTIIOONN NNOONN--CCOONNDDEENNSSIINNGG FFUURRNNAACCEESS

4S8XB-SF-2B-EN
WWAARRNNIINNGG
EEXXPPLLOOSSIIOONN HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseerriioouuss ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
DDoo nnoott ssttoorree ccoommbbuussttiibbllee mmaatteerriiaallss,, ggaassoolliinnee,, oorr
ootthheerr ffllaammmmaabbllee vvaappoorrss oorr lliiqquuiiddss nneeaarr tthhee uunniitt
WWAARRNNIINNGG
SSAAFFEETTYY HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
DDoo nnoott uussee sseemmii--rriiggiidd mmeettaalllliicc ggaass ccoonnnneeccttoorrss
((fflleexxiibbllee ggaass lliinneess)) wwiitthhiinn tthhee ffuurrnnaaccee ccaabbiinneett
WWAARRNNIINNGG
IINNSSTTAALLLLAATTIIOONN WWAARRNNIINNGG —— HHIIGGHH
VVOOLLTTAAGGEE MMOOVVIINNGG PPAARRTTSS!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
BBooddiillyy iinnjjuurryy ccaann rreessuulltt ffrroomm hhiigghh vvoollttaaggee
eelleeccttrriiccaall ccoommppoonneennttss,, ffaasstt mmoovviinngg ffaannss,, aanndd
ccoommbbuussttiibbllee ggaass FFoorr pprrootteeccttiioonn ffrroomm tthheessee
iinnhheerreenntt hhaazzaarrddss dduurriinngg iinnssttaallllaattiioonn aanndd sseerrvviicciinngg,,
tthhee mmaaiinn ggaass vvaallvvee mmuusstt bbee ttuurrnneedd ooffff aanndd tthhee
eelleeccttrriiccaall ssuuppppllyy mmuusstt bbee ddiissccoonnnneecctteedd IIff
ooppeerraattiinngg cchheecckkss mmuusstt bbee ppeerrffoorrmmeedd wwiitthh tthhee uunniitt
ooppeerraattiinngg,, iitt iiss tthhee tteecchhnniicciiaann’’ss rreessppoonnssiibbiilliittyy ttoo
rreeccooggnniizzee tthheessee hhaazzaarrddss aanndd pprroocceeeedd ssaaffeellyy
WWAARRNNIINNGG
SSAAFFEETTYY HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
DDoo nnoott iinnssttaallll tthhee ffiilltteerr iinn tthhee rreettuurrnn dduucctt ddiirreeccttllyy
aabboovvee tthhee ffuurrnnaaccee iinn hhoorriizzoonnttaall aapppplliiccaattiioonnss
IInnssttaallll tthhee ffiilltteerr rreemmootteellyy
WWAARRNNIINNGG
SSAAFFEETTYY HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
TTuurrnn tthhee ppoowweerr ttoo tthhee ffuurrnnaaccee ooffff bbeeffoorree sseerrvviicciinngg
ffiilltteerrss ttoo aavvooiidd ccoonnttaacctt wwiitthh mmoovviinngg ppaarrttss
WWAARRNNIINNGG
CCAARRBBOONN MMOONNOOXXIIDDEE HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
FFuurrnnaaccee vveennttiinngg iinnttoo aann uunnlliinneedd mmaassoonnrryy cchhiimmnneeyy
oorr ccoonnccrreettee cchhiimmnneeyy iiss pprroohhiibbiitteedd
WWAARRNNIINNGG
CCAARRBBOONN MMOONNOOXXIIDDEE HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
TThhee cchhiimmnneeyy lliinneerr mmuusstt bbee tthhoorroouugghhllyy iinnssppeecctteedd
ttoo iinnssuurree nnoo ccrraacckkss oorr ootthheerr ppootteennttiiaall aarreeaass ffoorr fflluuee
ggaass lleeaakkss aarree pprreesseenntt iinn tthhee lliinneerr LLiinneerr lleeaakkss wwiillll
rreessuulltt iinn eeaarrllyy ddeetteerriioorraattiioonn ooff tthhee cchhiimmnneeyy
WWAARRNNIINNGG
SSHHOOCCKK HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, sseevveerree ppeerrssoonnaall iinnjjuurryy,, oorr
ddeeaatthh
IIff aa ddiissccoonnnneecctt sswwiittcchh iiss pprreesseenntt,, iitt mmuusstt aallwwaayyss bbee
lloocckkeedd iinn tthhee ooppeenn ppoossiittiioonn bbeeffoorree sseerrvviicciinngg tthhee
uunniitt
WWAARRNNIINNGG
OOVVEERRHHEEAATTIINNGG AANNDD EEXXPPLLOOSSIIOONN
HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss WWaarrnniinngg ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee,, ppeerrssoonnaall iinnjjuurryy oorr ddeeaatthh
SShhoouulldd oovveerrhheeaattiinngg ooccccuurr,, oorr tthhee ggaass ssuuppppllyy ffaaiill ttoo
sshhuutt ooffff,, sshhuutt ooffff tthhee ggaass vvaallvvee ttoo tthhee uunniitt bbeeffoorree
sshhuuttttiinngg ooffff tthhee eelleeccttrriiccaall ssuuppppllyy
CCAAUUTTIIOONN
IIMMPPRROOPPEERR VVOOLLTTAAGGEE CCOONNNNEECCTTIIOONN!!
FFaaiilluurree ttoo ffoollllooww tthhiiss CCaauuttiioonn ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee
DDoo NNOOTT ccoonnnneecctt tthhee ffuurrnnaaccee lliinnee vvoollttaaggee ttoo aa GGFFCCII
pprrootteecctteedd cciirrccuuiitt
CCAAUUTTIIOONN
CCOORRRROOSSIIOONN WWAARRNNIINNGG!!
FFaaiilluurree ttoo ffoollllooww tthhiiss CCaauuttiioonn ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee oorr ppeerrssoonnaall iinnjjuurryy
DDoo nnoott iinnssttaallll tthhee ffuurrnnaaccee iinn aa ccoorrrroossiivvee oorr
ccoonnttaammiinnaatteedd aattmmoosspphheerree
SSAAFFEETTYY SSEECCTTIIOONN NNOONN--CCOONNDDEENNSSIINNGG FFUURRNNAACCEESS

S8XB-SF-2B-EN 5
CCAAUUTTIIOONN
SSHHAARRPP EEDDGGEE HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss CCaauuttiioonn ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee oorr ppeerrssoonnaall iinnjjuurryy
BBee ccaarreeffuull ooff sshhaarrpp eeddggeess oonn eeqquuiippmmeenntt oorr aannyy
ccuuttss mmaaddee oonn sshheeeett mmeettaall wwhhiillee iinnssttaalllliinngg oorr
sseerrvviicciinngg
CCAAUUTTIIOONN
BBAACCKKUUPP WWRREENNCCHH RREEQQUUIIRREEDD!!
FFaaiilluurree ttoo ffoollllooww tthhiiss CCaauuttiioonn ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee oorr ppeerrssoonnaall iinnjjuurryy
UUssee aa bbaacckkuupp wwrreenncchh oonn tthhee ggaass vvaallvvee wwhheenn
iinnssttaalllliinngg ggaass ppiippiinngg ttoo pprreevveenntt ddaammaaggee ttoo tthhee ggaass
vvaallvvee aanndd mmaanniiffoolldd aasssseemmbbllyy
CCAAUUTTIIOONN
FFRREEEEZZEE CCAAUUTTIIOONN!!
FFaaiilluurree ttoo ffoollllooww tthhiiss CCaauuttiioonn ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee oorr ppeerrssoonnaall iinnjjuurryy
IIff ccoommpplleettee ffuurrnnaaccee sshhuuttddoowwnn iiss ddoonnee dduurriinngg tthhee
ccoolldd wweeaatthheerr mmoonntthhss,, pprroovviissiioonnss mmuusstt bbee ttaakkeenn ttoo
pprreevveenntt ffrreeeezzee--uupp ooff aallll wwaatteerr ppiippeess aanndd wwaatteerr
rreecceeppttaacclleess
CCAAUUTTIIOONN
FFRREEEEZZEE CCAAUUTTIIOONN!!
FFaaiilluurree ttoo ffoollllooww tthhiiss CCaauuttiioonn ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee oorr ppeerrssoonnaall iinnjjuurryy
WWhheenneevveerr yyoouurr hhoouussee iiss ttoo bbee vvaaccaanntt,, aarrrraannggee ttoo
hhaavvee ssoommeeoonnee iinnssppeecctt yyoouurr hhoouussee ffoorr pprrooppeerr
tteemmppeerraattuurree TThhiiss iiss vveerryy iimmppoorrttaanntt dduurriinngg
ffrreeeezziinngg wweeaatthheerr IIff ffoorr aannyy rreeaassoonn yyoouurr ffuurrnnaaccee
sshhoouulldd ffaaiill ttoo ooppeerraattee ddaammaaggee ccoouulldd rreessuulltt,, ssuucchh
aass ffrroozzeenn wwaatteerr ppiippeess
CCAAUUTTIIOONN
IIGGNNIITTIIOONN FFUUNNCCTTIIOONN!!
FFaaiilluurree ttoo ffoollllooww tthhiiss CCaauuttiioonn mmaayy rreessuulltt iinn ppoooorr
iiggnniittiioonn cchhaarraacctteerriissttiiccss
MMaaiinnttaaiinn mmaanniiffoolldd pprreessssuurree iinn hhiigghh aallttiittuuddee
iinnssttaallllaattiioonnss
CCAAUUTTIIOONN
WWAATTEERR DDAAMMAAGGEE!!
FFaaiilluurree ttoo ffoollllooww tthhiiss CCaauuttiioonn ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee oorr ppeerrssoonnaall iinnjjuurryy
IItt iiss rreeccoommmmeennddeedd tthhaatt aann eexxtteerrnnaall oovveerrffllooww ddrraaiinn
ppaann bbee iinnssttaalllleedd iinn aallll aapppplliiccaattiioonnss oovveerr aa ffiinniisshheedd
cceeiilliinngg ttoo pprreevveenntt pprrooppeerrttyy ddaammaaggee oorr ppeerrssoonnaall
iinnjjuurryy ffrroomm lleeaakkiinngg ccoonnddeennssaattee
CCAAUUTTIIOONN
HHOOTT SSUURRFFAACCEE!!
FFaaiilluurree ttoo ffoollllooww tthhiiss CCaauuttiioonn ccoouulldd rreessuulltt iinn
ppeerrssoonnaall iinnjjuurryy
DDoo NNOOTT ttoouucchh iiggnniitteerr IItt iiss eexxttrreemmeellyy hhoott
CCAAUUTTIIOONN
FFUURRNNAACCEE SSEERRVVIICCEE CCAAUUTTIIOONN!!
FFaaiilluurree ttoo ffoollllooww tthhiiss CCaauuttiioonn ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee oorr ppeerrssoonnaall iinnjjuurryy
LLaabbeell aallll wwiirreess pprriioorr ttoo ddiissccoonnnneeccttiioonn wwhheenn
sseerrvviicciinngg ccoonnttrroollss VVeerriiffyy pprrooppeerr ooppeerraattiioonn aafftteerr
sseerrvviicciinngg WWiirriinngg eerrrroorrss ccaann ccaauussee iimmpprrooppeerr aanndd
ddaannggeerroouuss ooppeerraattiioonn
CCAAUUTTIIOONN
DDOO NNOOTT UUSSEE AASS CCOONNSSTTRRUUCCTTIIOONN
HHEEAATTEERR!!
FFaaiilluurree ttoo ffoollllooww tthhiiss CCaauuttiioonn ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee oorr ppeerrssoonnaall iinnjjuurryy
IInn oorrddeerr ttoo pprreevveenntt sshhoorrtteenniinngg iittss sseerrvviiccee lliiffee,, tthhee
FFuurrnnaaccee sshhoouulldd NNOOTT bbee uusseedd aass aa ““CCoonnssttrruuccttiioonn
HHeeaatteerr”” dduurriinngg tthhee ffiinniisshhiinngg pphhaasseess ooff
ccoonnssttrruuccttiioonn uunnttiill tthhee rreeqquuiirreemmeennttss lliisstteedd iinn tthhee
ffuurrnnaaccee iinnssttaallllaattiioonn gguuiiddeelliinneess ooff tthhee IInnssttaalllleerr''ss
GGuuiiddee hhaavvee bbeeeenn mmeett CCoonnddeennssaattee iinn tthhee pprreesseennccee
ooff cchhlloorriiddeess aanndd fflluuoorriiddeess ffrroomm ppaaiinntt,, vvaarrnniisshh,,
ssttaaiinnss,, aaddhheessiivveess,, cclleeaanniinngg ccoommppoouunnddss,, aanndd
cceemmeenntt ccrreeaattee aa ccoorrrroossiivvee ccoonnddiittiioonn wwhhiicchh mmaayy
ccaauussee rraappiidd ddeetteerriioorraattiioonn ooff tthhee hheeaatt eexxcchhaannggeerr
CCAAUUTTIIOONN
WWIIRRIINNGG IINNFFOORRMMAATTIIOONN!!
FFaaiilluurree ttoo ffoollllooww tthhiiss CCaauuttiioonn ccoouulldd rreessuulltt iinn
pprrooppeerrttyy ddaammaaggee oorr ppeerrssoonnaall iinnjjuurryy
TThhee iinntteeggrraatteedd ffuurrnnaaccee ccoonnttrrooll iiss ppoollaarriittyy
sseennssiittiivvee TThhee hhoott lleegg ooff tthhee 112200 VVAACC ppoowweerr mmuusstt
bbee ccoonnnneecctteedd ttoo tthhee BBLLAACCKK ffiieelldd lleeaadd
SSAAFFEETTYY SSEECCTTIIOONN NNOONN--CCOONNDDEENNSSIINNGG FFUURRNNAACCEESS

6S8XB-SF-2B-EN
CCAAUUTTIIOONN
EEQQUUIIPPMMEENNTT DDAAMMAAGGEE!!
UUVV lliigghhtt eexxppoossuurree ccaann ccaauussee tthhee ppllaassttiicc bblloowweerr
mmaatteerriiaall ttoo ddeetteerriioorraattee wwhhiicchh ccoouulldd lleeaadd ttoo BBlloowweerr
HHoouussiinngg DDaammaaggee
FFoorr uunniittss ccoonnttaaiinniinngg aa ppllaassttiicc BBlloowweerr HHoouussiinngg,, DDoo
NNOOTT iinnssttaallll tthhiirrdd ppaarrttyy UUllttrraa--VViioolleett AAiirr CClleeaanneerrss
wwhheerree tthhee BBlloowweerr HHoouussiinngg ccaann bbee eexxppoosseedd ttoo UUVV
lliigghhtt
For more information, visit www.trane.com and www.
americanstandardair.com or contact your installing dealer.
6200 Troup Highway
Tyler, TX 75707
WWAARRNNIINNGG
CCAARRBBOONN MMOONNOOXXIIDDEE PPOOIISSOONNIINNGG
HHAAZZAARRDD!!
FFaaiilluurree ttoo ffoollllooww tthhee sstteeppss oouuttlliinneedd bbeellooww ffoorr eeaacchh
aapppplliiaannccee ccoonnnneecctteedd ttoo tthhee vveennttiinngg ssyysstteemm bbeeiinngg
ppllaacceedd iinnttoo ooppeerraattiioonn ccoouulldd rreessuulltt iinn ccaarrbboonn
mmoonnooxxiiddee ppooiissoonniinngg oorr ddeeaatthh
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:
•• IInnssppeecctt tthhee vveennttiinngg ssyysstteemm ffoorr pprrooppeerr ssiizzee
aanndd hhoorriizzoonnttaall ppiittcchh aass rreeqquuiirreedd iinn tthhee
NNaattiioonnaall FFuueell GGaass CCooddee,, AANNSSII ZZ222233 11//NNFFPPAA
5544 aanndd tthheessee iinnssttrruuccttiioonnss DDeetteerrmmiinnee tthheerree iiss
nnoo bblloocckkaaggee oorr rreessttrriiccttiioonn,, lleeaakkaaggee,, ccoorrrroossiioonn
oorr ootthheerr ddeeffiicciieenncciieess wwhhiicchh ccoouulldd ccaauussee aann
uunnssaaffee ccoonnddiittiioonn
•• CClloossee aallll ddoooorrss aanndd wwiinnddoowwss bbeettwweeeenn tthhee
ssppaaccee iinn wwhhiicchh tthhee aapppplliiaannccee((ss)) ccoonnnneecctteedd ttoo
tthhee vveennttiinngg ssyysstteemm aarree llooccaatteedd AAllssoo cclloossee
ffiirreeppllaaccee ddaammppeerrss
•• TTuurrnn oonn ccllootthheess ddrryyeerrss aanndd aannyy aapppplliiaannccee nnoott
ccoonnnneecctteedd ttoo tthhee vveennttiinngg ssyysstteemm TTuurrnn oonn
aannyy eexxhhaauusstt ffaannss ssuucchh aass rraannggee hhooooddss ssoo
tthheeyy aarree ooppeerraattiinngg aatt mmaaxxiimmuumm ssppeeeedd DDoo
nnoott ooppeerraattee aa ssuummmmeerr eexxhhaauusstt ffaann
•• FFoollllooww tthhee lliigghhttiinngg iinnssttrruuccttiioonnss PPllaaccee tthhee
aapppplliiaannccee bbeeiinngg iinnssppeecctteedd iinnttoo ooppeerraattiioonn
AAddjjuusstt tthhee tthheerrmmoossttaatt ssoo aapppplliiaannccee iiss
ooppeerraattiinngg ccoonnttiinnuuoouussllyy
•• TTeesstt ffoorr ssppiillllaaggee ffrroomm ddrraafftt hhoooodd eeqquuiippppeedd
aapppplliiaanncceess aatt tthhee ddrraafftt hhoooodd rreelliieeff ooppeenniinngg
aafftteerr 55 mmiinnuutteess ooff mmaaiinn bbuurrnneerr ooppeerraattiioonn
UUssee tthhee ffllaammee ooff aa mmaattcchh oorr ccaannddllee
•• IIff iimmpprrooppeerr vveennttiinngg iiss oobbsseerrvveedd dduurriinngg aannyy ooff
tthhee aabboovvee tteessttss,, tthhee vveennttiinngg ssyysstteemm mmuusstt bbee
ccoorrrreecctteedd iinn aaccccoorrddaannccee wwiitthh tthhee NNaattiioonnaall
FFuueell GGaass CCooddee,, AANNSSII ZZ222211 11//NNFFPPAA 5544
•• AAfftteerr iitt hhaass bbeeeenn ddeetteerrmmiinneedd tthhaatt eeaacchh
aapppplliiaannccee ccoonnnneecctteedd ttoo tthhee vveennttiinngg ssyysstteemm
pprrooppeerrllyy vveennttss wwhheenn tteesstteedd,, rreettuurrnn aallll ddoooorrss,,
wwiinnddoowwss,, eexxhhaauusstt ffaannss,, eettcc ttoo tthheeiirr pprreevviioouuss
ccoonnddiittiioonn ooff uussee
SSAAFFEETTYY SSEECCTTIIOONN NNOONN--CCOONNDDEENNSSIINNGG FFUURRNNAACCEESS

S8XB-SF-2B-EN 7
Product Specifications
MODEL S8B1B080M4PSBA(a)
S8X1B080M4PSBA(a)
S8B1D120M5PSBA (a)
S8X1D120M5PSBA (a)
TYPE Upflow / Horizontal / Downflow Upflow / Horizontal / Downflow
RATINGS (b)
Input BTUH 80,000 120,000
Capacity BTUH (ICS) (c) 64,800 97,700
Temp. Rise (Min.-Max.)°F 30 - 60 30 - 60
AFUE – Rating (c) 80 80
Return Air Temp. (Min. - Max.)°F 55°F - 80°F 55°F - 80°F
BLOWER DRIVE DIRECT DIRECT
Diameter — Width (In.) 11 X 8 11 X 11
No. Used 1 1
Speeds (No.) (d) CTM – 9 CTM – 9
CFM vs. in. w.g. See Fan Performance Table See Fan Performance Table
Motor HP 3/4 1
RPM 1050 1050
Volts/Ph/Hz 120 / 1 / 60 120 / 1 / 60
FLA 9.2 10.9
COMBUSTION FAN — Type SP PSC
Drive — No. Speeds Direct - 1 Direct - 1
Motor RPM 3300 3200
Volts/Ph/Hz 120 / 1 / 60 120 / 1 / 60
FLA 1.39 0.33
Inducer Orifice 1.80 2.15
FILTER — Furnished? No No
Type recommended High Velocity High Velocity
High Vel. (No.-Size-Thk.) 1 - 16 X 25 - 1 in. 1 - 24 X 25 - 1 in.
VENT PIPE DIAMETER — Min (in.) (e) 4 Round 4 Round
HEAT EXCHANGER – Type Aluminized Steel Aluminized Steel
Gauge (Fired) 20 – 19 20 – 19
ORIFICES — Main
Nat. Gas Qty. — Drill Size 4 - 45 6 - 45
L.P. Gas Qty. - Drill Size 4 – 56 6 – 56
GAS VALVE Redundant - Single Stage Redundant - Single Stage
PILOT SAFETY DEVICE – Type 120 V SiNi Igniter 120 V SiNi Igniter
BURNERS — QTY 4 6
POWER CONN. — V/Ph/Hz (f) 120 / 1 / 60 120 / 1 / 60
Ampacity (Amps) 13.1 14.1
Max. Overcurrent Protection (Amps) 15 15
PIPE CONN. SIZE (in.) 1/2 1/2
(a) Central Furnace heating designs are certified to ANSI Z21.47 - latest edition.
(b) For U.S. applications, above input ratings (BTUH) are up to 2,000 feet, derate 4% per 1,0000 feet for elevations above 2,000 feet above sea level.
(c) Based on U.S. government standard tests
(d) 9 Speed constant torque ECM Blower Motor.
(e) Refer to the Installer's Guide.
(f) The above wiring specifications are in accordance with National Electric Code, however, installations must comply with local codes.

8S8XB-SF-2B-EN
MODEL S8X2B080M4PSBA (a) S8X2D120M5PSBA (a)
TYPE Upflow / Horizontal / Downflow Upflow / Horizontal / Downflow
RATINGS (b)
1st Stage Input BTUH 52,000 84,000
1st Stage Capacity BTUH (ICS) 42,300 67,700
2nd Stage Input BTUH 80,000 120,000
2nd Stage Capacity BTUH (ICS) (c) 64,700 97,500
1st Stage Temp. Rise (Min.-Max.)°F 30 — 60 25 — 55
2nd Stage Temp. Rise (Min.-Max.)°F 30 — 60 30 — 60
AFUE (%) (c) 80 80
Return Air Temp. (Min. - Max.)°F 55°F - 80°F 55°F - 80°F
BLOWER DRIVE DIRECT DIRECT
Diameter — Width (In.) 11 X 8 11 X 11
No. Used 1 1
Speeds (No.) (d) CTM – 9 CTM – 9
CFM vs. in. w.g. See Fan Performance Table See Fan Performance Table
Motor HP 3/4 1
RPM 1050 1050
Volts/Ph/Hz 120 / 1 / 60 120 / 1 / 60
FLA 9.2 10.9
COMBUSTION FAN — Type PSC PSC
Drive — No. Speeds Direct - 2 Direct - 2
Motor RPM 3200 / 2400 3200 / 2900
Volts/Ph/Hz 120 / 1 / 60 120 / 1 / 60
FLA 0.29 0.33
Inducer Orifice 1.75 2.15
FILTER — Furnished? No No
Type recommended High Velocity High Velocity
High Vel. (No.-Size-Thk.) 1 - 16 X 25 - 1 in. 1 - 24 X 25 - 1 in.
VENT PIPE DIAMETER — Min (in.) (e) 4 Round 4 Round
HEAT EXCHANGER – Type Aluminized Steel Aluminized Steel
Gauge (Fired) 20 – 19 20 – 19
ORIFICES — Main
Nat. Gas Qty. — Drill Size 4 - 45 6 - 45
L.P. Gas Qty. - Drill Size 4 – 56 6 – 56
GAS VALVE Redundant - Two Stage Redundant - Two Stage
PILOT SAFETY DEVICE – Type 120 V SiNi Igniter 120 V SiNi Igniter
BURNERS — (QTY) 4 6
POWER CONN. — V/Ph/Hz (f) 120 / 1 / 60 120 / 1 / 60
Ampacity (Amps) 12.0 14.1
Max. Overcurrent Protection (Amps) 15 15
PIPE CONN. SIZE (in.) 1/2 1/2
(a) Central Furnace heating designs are certified to ANSI Z21.47 - latest edition.
(b) For U.S. applications, above input ratings (BTUH) are up to 2,000 feet, derate 4% per 1,0000 feet for elevations above 2,000 feet above sea level.
(c) Based on U.S. government standard tests
(d) 9 Speed constant torque ECM Blower Motor.
(e) Refer to the Installer's Guide.
(f) The above wiring specifications are in accordance with National Electric Code, however, installations must comply with local codes.
PPrroodduucctt SSppeecciiffiiccaattiioonnss

S8XB-SF-2B-EN 9
Sequence of Operation S8B1/S8X1/S8X2
NNoottee:: The seven-segment LED readout is based on
thermostat input. For the S8X2, during
simultaneous call for W1 and W2, the seven-
segment LED will read “
Xt2 ”, although the IFC
will process the call for 1st stage heat first.
EEAACC aanndd HHUUMM TTiimmiinngg
• EAC relay closes approximately 2 seconds after the
blower starts
• EAC relay opens when the blower motor stops
• HUM relay closes on any heating call (HP/Gas)
approximately 1 second after the blower motor
starts
• HUM relay opens when any heating call (HP/Gas) is
removed
11sstt SSttaaggee GGaass HHeeaattiinngg
1 R – W1 contacts close on the thermostat sending
24VAC to the W1 low voltage terminal of the IFC
Technician should read 24VAC from W1 to B/C The
seven segment LED will read:
•Xt = S8B1/S8X1
•Xt1 = S8X2
2 The IFC performs a self-check routine and then
confirms:
a Flame roll-out switches (FRS) 1 & 2, main
thermal limit (TCO), and any reverse air flow
(RAF) switches are closed by sending 24VAC out
the HLO terminal and monitoring the HLI input
b Pressure switch 1 (PS1) and pressure switch 2
(PS2–S8X2 only) are opened by sending 24VAC
out the HLO terminal, through the limit
switches, and monitoring the PS1 (3) and PS2
(7) inputs
NNoottee:: If a thermal limit is open, 24VAC will not
be present at either pressure switch.
3 After steps a & b are confirmed, the inducer relay is
closed, energizing the inducer motor
4 As the inducer ramps up, PS1 will close
NNoottee:: S8X2 units will start the inducer motor on high
speed for appro imately 6 seconds, then switch
to low speed. If PS1 does not close within 60
seconds, the control will report a
e3 . 1 error and
increase the inducer to high speed in an attempt
to close PS1.
5 When PS1 closes, the igniter relay on the IFC will
close The igniter is energized The igniter warm up
is approximately 17 seconds
6 After the igniter warm up, the 1 st stage gas valve
relay is closed, which energizes the 1st stage gas
valve solenoid to allow ignition
7 The first burner will ignite, and flame will crossover
to the remaining burners establishing current to the
flame sensor Flame sensing must be established
within 4 seconds
NNoottee:: There are two flame sense pads located on the
IFC marked as “FP”. To measure the flame
current, use a VOM set to DC volts. 1VDC = 1
micro-amp. Flame current will vary depending
on the type of meter used. Typical flame current
ranges from 0.75 – 3.0 micro-amps (0.75 – 3 VDC).
8 Once the flame sense has been established, a timer
on the IFC starts and the indoor blower will energize
at 1st stage speed after the blower “Heat On Delay”
has completed The seven-segment LED for
example will alternately read:
•Xt = Gas heating = S8B1/S8X1
•Xt1= Gas heating, stage 1 = S8X2
•tP3= Tap 3
9 When the temperature raises enough to satisfy the
thermostat setting, contacts R-W1 will open
10 The gas valve relay will open, closing the gas valve
The inducer will continue to run for approximately 5
seconds to remove any combustion byproducts
from inside the furnace
11 The indoor blower continues to run to remove heat
from the heat exchangers The “blower off” time is
field adjustable through the IFC menu setup option
The seven-segment LED will read “IDL” = Idle, no
thermostat demand
22nndd SSttaaggee GGaass HHeeaattiinngg ((SS88XX22 OOnnllyy))
1 See sequence of operation for 1st stage gas heating
operation above (steps 1–7)
NNoottee:: 2nd stage heating cannot operate without 1st
stage operation.
2 R-W2 contacts close on the thermostat sending
24VAC from to the W2 low voltage terminal of the
IFC Technician should read 24VAC from W2 to B/C
The seven-segment LED will read Ht2
3 The IFC checks to ensure that PS2 is open, and then
energizes the 2nd stage inducer relay The inducer
is energized on high speed, and the second stage
gas valve relay on the IFC closes, energizing second
stage gas valve The indoor blower motor will ramp
up to the 2nd stage gas heating speed The seven-
segment LED for example will alternately read:
•Xt2 = Gas heating = stage 2
•tP5= Tap 5
4 The IFC monitors PS2 for closure and if PS2 does
not close within 45 seconds, a PS2 open error will
be declared and the furnace will operate in 1st
stage If PS2 closes, 2nd stage gas heating will
continue until the thermostat R-W2 contacts open

10 S8XB-SF-2B-EN
NNoottee:: If PS2 does not close within the 45 seconds, the
IFC will wait 10 minutes and repeat steps 3 & 4. If
on the third attempt during the same heating call,
PS2 does not close within the 45 second proving
time, the unit will run in 1st stage until the
thermostat R-W2 contacts open.
5 When the temperature raises enough to satisfy the
thermostat setting, contacts R-W2 will open, the 2nd
stage gas valve will close, the indoor blower motor
will ramp down to 1st stage, and the unit will
continue to run until R-W1 contacts open
6 When the temperature raises enough to satisfy the
thermostat setting, contacts R-W1 will open
7 The gas valve relay will open, closing the gas valve
The inducer will continue to run for approximately 5
seconds to remove any combustion byproducts
from inside the furnace
8 The indoor blower continues to run to remove heat
from the heat exchangers This blower off time is
field adjustable through the IFC menu setup option
The seven-segment LED will read 1DL = Idle, no
thermostat demand
SSiinnggllee SSttaaggee CCoooolliinngg
1 R-Y1-G contacts on the thermostat close sending
24VAC to the Y1 and G low voltage terminals on the
IFC Technician should read 24VAC between Y1-B/C
and between G-B/C
NNoottee:: For S8X2 units, the factory supplied Y1-O
jumper must remain in place for proper
seven-segment LED readout, and furnace
operation. If removed, the seven-segment
LED will read “
HP1 ”.
2 24VAC is sent to the OD unit via thermostat wiring
3 The indoor blower ramps to the cooling airflow
The seven-segment LED for example will
alternately read:
•CL1 = Cooling, Stage 1 (S8X2)
•CP1 = Cooling, Stage 1 (S8B1/S8X1)
•tP3 = Tap 3
4 When the temperature is lowered enough to satisfy
the thermostat setting, contacts R-Y-G will open
5 The OD unit shuts off and the indoor blower shuts
off, unless a blower “Cool Off Delay” has been
enabled in the IFC setup menu options The seven-
segment LED will read “IDL” = Idle, no thermostat
demand
TTwwoo SSttaaggee CCoooolliinngg
1 See sequence of operation for Single stage cooling
operation above (steps 1–3)
2 R-Y2 contact on the thermostat close sending
24VAC to Y2 low voltage terminal on the IFC
Technician should read 24VAC between Y2 and B/C
3 24VAC is sent to the OD unit via thermostat wiring
4 The indoor airflow ramps to 2nd stage airflow The
seven-segment LED for example will read:
•CL2 = Cooling, Stage 2 (S8X2)
•CP2 = Cooling, Stage 2 (S8X1)
•tP7 = Tap 7
5 When the temperature is lowered enough to satisfy
the thermostat setting, contacts R-Y1-Y2-G will
open
6 The OD unit shuts off and the indoor blower shuts
off, unless a blower “Cool Off Delay” has been
enabled in the IFC setup menu options The seven-
segment LED will read 1DL = Idle, no thermostat
demand
SSiinnggllee SSttaaggee HHeeaatt PPuummpp
1 R-Y1-G contacts on the thermostat close sending
24VAC to the Y1 and G low voltage terminals on the
IFC Technician should read 24VAC between Y1-B/C
and between G-B/C
NNoottee:: For S8X2 units, the factory supplied Y1-O
jumper must be removed for proper
seven-segment LED readout and furnace
operation during defrost. If left in place,
the seven-segment LED will read
CL1
2 24 VAC is sent to the OD unit via thermostat wiring
3 The indoor blower ramps to the cooling airflow
The seven-segment LED for example will
alternately read:
•HP1 = Cooling, Stage 1 (S8X2)
•CP1 = Cooling, Stage 1 (S8B1/S8X1)
•tP3 = Tap 3
4 When the temperature is lowered enough to satisfy
the thermostat setting, contacts R-Y-G will open
5 The OD unit shuts off and the indoor blower shuts
off, unless a “Cool Off Delay” has been enabled in
the IFC setup menu options The seven-segment
LED will read 1DL = Idle, no thermostat demand
TTwwoo SSttaaggee HHeeaatt PPuummpp
1 See sequence of operation for single stage cooling
operations above (steps 1–3)
2 R-Y2 contact on the thermostat close sending
24VAC to Y2 low voltage terminal on the IFC
Technician should read 24VAC between Y2 and B/C
3 24VAC is sent to the OD unit via thermostat wiring
4 The indoor airflow ramps to 2nd stage airflow The
seven-segment LED for example will read:
•HP2 = Cooling, Stage 2 (S8X2)
•CP2 = Cooling, Stage 2 (S8X1)
•tP7 = Tap 7
5 When the temperature is raised enough to satisfy
the thermostat setting, contacts R-Y1-Y2-G will
open
6 The OD unit shuts off and the indoor blower shuts
off, unless a “Blower Off Delay” has been enabled
in the IFC setup menu options The seven-segment
LED will read 1dL = Idle, no thermostat demand
SSeeqquueennccee ooff OOppeerraattiioonn SS88BB11//SS88XX11//SS88XX22

S8XB-SF-2B-EN 11
Periodic Servicing Requirements
1 GENERAL INSPECTION – EE aammiinnee tthhee ffuurrnnaaccee
iinnssttaallllaattiioonn aannnnuuaallllyy ffoorr tthhee ffoolllloowwiinngg iitteemmss::
a All flue product carrying areas external to the
Furnace (i e chimney, vent connector) are clear
and free of obstruction A vent screen in the end
of the Vent (flue) Pipe must be inspected for
blockage annually, if applicable
b The vent connector is in place, slopes upward
and is physically sound without holes or
excessive corrosion
c The return air duct connection(s) is physically
sound, is sealed to the Furnace and terminates
outside the space containing the Furnace
d The physical support of the Furnace should be
sound without sagging, cracks, gaps, etc ,
around the base so as to provide a seal between
the support and the base
2 FILTERS – Filters should be cleaned or replaced
(with high velocity filters only), monthly and more
frequently during high use times of the year such as
midsummer or midwinter
3 BLOWERS – The Blower size and speed determine
the air volume delivered by the Furnace The
Blower motor bearings are factory lubricated and
under normal operating conditions do not require
servicing Annual cleaning of the Blower wheel and
housing is recommended for maximum air output,
and this must be performed only by a qualified
servicer or service agency
4 IGNITER – This unit has a special hot surface direct
ignition device that automatically lights the
burners Please note that it is very fragile and
should be handled with care ! CAUTION Do NOT
touch igniter It is extremely hot
5 BURNER – Gas burners do not normally require
scheduled servicing, however, accumulation of
foreign material may cause a yellowing flame or
delayed ignition Either condition indicates that a
service call is required For best operation, burners
must be cleaned annually using brushes and
vacuum cleaner Turn off gas and electric power
supply To clean burners, remove burner bottom
plate (2 screws) and bottom burner bracket (2
screws) Twist burner towards slot, lift, and push
forward away from orifice Remove burners
Alternate method — Remove manifold assembly,
bottom burner plate, and bottom burner bracket
Remove burners
NNoottee:: Be careful NOT to break igniter when removing
burners.
Clean burners with brush and/ or vacuum cleaner
Reassemble parts by reversal of the above
procedure
NNoottee:: Natural gas units should not have any yellow
tipped flames. This condition indicates that a
service call is required. For best operation,
burners must be cleaned annually using brushes
and vacuum cleaner
NNoottee:: On Propane units, due to variations in BTU
content and altitude, servicing may be required
at shorter intervals.
6 HEAT EXCHANGER/ FLUE PIPE – These items must
be inspected for signs of corrosion, and/ or
deterioration at the beginning of each heating
season by a qualified service technician and
cleaned annually for best operation To clean flue
gas passages, follow recommendations below:
a Turn off gas and electric power supply
b Inspect flue pipe exterior for cracks, leaks, holes
or leaky joints Some discoloration of PVC pipe
is normal
c Remove door from Furnace
d Inspect around insulation covering flue collector
box Inspect induced draft Blower connections
from recuperative cell and to the flue pipe
connection
e Remove burners (See 5 Burner)
f Use a mirror and flashlight to inspect interior of
Heat Exchanger, be careful not to damage the
Igniter, Flame Sensor or other components
g If any corrosion is present, the Heat Exchanger
should be cleaned by a qualified service
technician
h After inspection is complete replace burners
and Furnace door
i Restore gas supply Check for leaks using a soap
solution Restore electrical supply Check unit
for normal operation
7 COOLING COIL CONDENSATE DRAIN - If a cooling
coil is installed with the Furnace, condensate drains
should be checked and cleaned periodically to
assure that condensate can drain freely from coil to
drain If condensate cannot drain freely water
damage could occur (See Condensate Drain in
Installer’s Guide )

12 S8XB-SF-2B-EN
Wiring Diagrams
BK BLACK
WH WHITE
YL YELLOW
OR ORANGE
GR GREEN
BR BROWN
RD RED
BL BLUE
YL/44
YL/43
WH/40
WH/40
BK/WH/38
YL/46
YL/52
WH/17
WH/17
WH/21
WH/21
BK/22
BK/22
WH/20
BK/18
BL/2
BL/2
BL/5
BL/5
RD/6
RD/6
RD/9
RD/9
8/RG
WH/12
YL/50
YL/50
YL/49
YL/49
GR/YL/31
13/LY/RG
YL/51
YL/51
YL/48
YL/48
BK/29
BK/29
OR/11
OR/11
YL/47
74/LY
BOX HARN
TO BURNER
BURNER BOX GND
NOTES:
1. IF ANY OF THE ORIGINAL WIRING SUPPLIED WITH THIS FURNACE MUST BE REPLACED, IT MUST BE WITH WIRE
HAVING A TEMPERATURE RATING OF AT LEAST 105°C. WIRES 12, 18, 20, 48, 49, 50, 51, 92 & 93 MUST BE RATED TO 250°C.
2. FOR PROPER AIRFLOW IN COOLING/HEAT PUMP MODE, "Y1" ON THE THERMOSTAT MUST BE CONNECTED TO "Y1"
OF THE IFC. SEE INSTALLER'S GUIDE FOR FIELD WIRING.
3. THE INDOOR BLOWER MOTOR AIRFLOW TABLES ARE LOCATED IN THE SERVICE FACTS. TO CHANGE AIRFLOW USE
THE MENU/OPTIONS BUTTONS.
4. LINE CHOKE AND WIRE BK/28 ONLY USED ON MODELS WITH 1 HP MOTORS.
5. FLAME SENSE TEST PADS: 1 VDC = 1 MICROAMP. FLAME CURRENT CAN VARY DEPENDING ON THE VOM THAT IS USED
AND THE VOLTAGE SUPPLIED TO THE FURNACE.
THE ACCEPTABLE RANGE IS 0.75-3 MICROAMPS.
6. IF APPLICABLE CONNECTION FOR FACTORY
SEE NOTE 2
ELECTRICAL RATING
INPUT: 24VAC, 60 HZ.
TNS SEC. CURRENT: 450MA.
+ MV LOAD
MV OUTPUT: 1.5A @ 24 VAC
IND OUTPUT: 2.2 FLA, 3.5 LRA
@120 VAC
IGN OUTPUT: 2.0 A @ 120 VAC
CIRC. BLOWER OUTPUT:
14.5 FLA, 25 LRA @ 120 VAC
HUMIDIFIER & AIR CLEANER
(DRY CONTACTS)
MAX. LOAD: 1.0A @ 120VAC
24 VAC OR 120 VAC MAY BE
USED
FUSE: 5A
INTEGRATED FURNACE CONTROL
LINE
24 V
LINE
24 V
FIELD
WIRING
FACTORY
WIRING
RAF REVERSE
AIR FLOW
PS PRESSURE
SWITCH
FRS FLAME ROLLOUT
SWITCH
FP FLAME PROBE
IGN HOT SURFACE
IGNITER
** INTERNAL THERMAL PROTECTION
FUSE
GROUND
SEE NOTE 5
PANEL LOOP
H LINE
N NEUTRAL
GND GROUND
HLO HIGH LIMIT
OUTPUT
HLI HIGH LIMIT
INPUT
PS PRESSURE SWITCH
INPUT
IND INDUCER
IFC INTEGRATED
FURNACE
CONTROL
RAF REVERSE
AIR FLOW
TH 24VAC (HOT)
TR 24VAC (COMMON)
MVC MAIN VALVE
COMMON
MV MAIN VALVE
TNS TRANSFORMER
ILI INDUCER LIMIT
INPUT
IGN IGNITER
FP FLAME PROBE
YL/45
YL/45
WH/15
WH/15
WH/16
WH/16
YL/3
YL/3
BK/39
BK/39
YL/WH/36
BL/WH/37
BK/14
BK/14
BK/13
BK/13
BK/WH/26
BK/WH/26
BL/WH/25
BL/WH/25
YL/WH/24
YL/WH/24
RD/WH/23
RD/WH/23
RD/WH/35
BK/28
BK/28
BL/57
BL/57
OR/WH/56
OR/WH/56
OR/WH/55
BL/42
BL/42
BK/30
BK/27
SEE
NOTE 4
LC LINE CHOKE
YL/46
YL/52
TIMINGS
PREPURGE: 0 SEC.
INTERPURGE: 60 SEC.
POST PURGE: 5 SEC.
IGN WARMUP: 20 SEC.
IAP: 3; TFI: 5 SEC.
RETRIES: 2 RECYCLES: 10
HEAT ON DELAY: UP TO 30 SEC.
COOL ON DELAY: 0 SEC.
AUTO RESTART: 60 MIN.
AUTO RESTART PURGE: 60 SEC.
1 Stage Inducer with CTM Blower Motor
D346340P01 REV H
HOd Heat Off Delay (sec)
IdL Idle
COF Blower Tap for Continuous Fan
Ht Heating
COP C1.Blower Tap for Compressor Mode
E04
tP Blower Tap Number
COF Continuous Fan
E05
CP1 Cooling/Heat Pump Mode
dft Defrost Mode
HtP H1.Blower Tap for Heating Mode
rUn
Orn Orientation
Err Active Alarm Menu
E01
L6F Last 6 Faults (To Clear,
Hold Option Button 5 sec)
E08 Flame current is low, but still
strong enough to allow operation
Cr Code Release Number
E11 (1) Gas valve not energized
(2) Gas valve relay stuck closed
COd Cooling Off Delay (sec)
E12 Open fuse
Open Pressure Switch
(1) Igniter relay fails
(2) Igniter open
Status Codes
Menu Options
Open Thermal Limit, Rollout Switch,
or Reverse Airflow Switch
Shorted Pressure Switch
Flame detected, should not be present
Voltage reversed polarity
Bad Grounding
Error Codes
Run Test Mode
Recycles exceeded (loss of
established flame or PS open x10)
Gas Valve not energized when it
should be exceeded after 10 times
Loss of IRQ or internal failures
Retry exceeded (Failed to est flame)
Gas valve is energized whenit should be off
WH/83
WH/83
BK/WH/84
BK/85
BK/85
YL/WH/86
BL/WH/87
RD/WH/88
OR/WH/89
BL/90
BL/90
GR/BK/91
ALTERNATE WIRING DIAGRAM - BLOWER MOTOR
BK/92
WH/93
BUTT SPLICE-WITH HEAT SHRINK
BUTT SPLICE-WITH HEAT SHRINK
85/LB
SEE NOTE 6
59/LY
YL/95
YL/96
YL/96
ALTERNATE
X
X
24v 120v
TNS
VENT
MOTOR
(INDUCER)
**
GAS
VALVE
MV C
RAF-1
IGN
PS
X
THERMAL_LIMIT
FLAME_ROLLOUT2
FLAME_ROLLOUT1
FLAME_PROBE
FP
HLI
MV
GND
TH
MVC
HLO
PS
TR
ILI (NOT USED)
IGN-N
IND-N
IND-H
IGN-H
IFC
LINE
NEUTRAL
WR G
B/C Y/Y1
THERMOSTAT
FP
MENU OPTION
TAP1
TAP2
TAP3
TAP4
TAP5
GND
LINE-N CIRC-N (blocked) TNS-N
TNS-H CIRC-H LINE-H
3 2 1 4 3 12
1
2
2
1
1
2
JUNCTION BOX
120v 60 Hz. 1 PH
POWER SUPPLY PER LOCAL CODE
H N
GND
X
RAF-2
10
9
8
7
6
5
4
3
2
1
1
2
3
4
121110987654321
123456789101112
6
5
4
3
2
1
123
1234
1
2
2
1
1
2
3
LINE CHOKE
REGAL -ENSITE
BLOWER
MOTOR
N
G
L
COM
®
1
2
3
4
5
6
1
2
3
121110987654321
1
2
3
4
5
1
2
3
4
BLOWER
MOTOR
C
L
G
N
S1
12
S2
12
E2.1
E2.2
E2.3
E3.1
E3.2
E6.1
E6.2
E6.3
E7.1
BLOWER
HOUSING
GND
BLOWER
HOUSING
GND
SEE NOTE 1
SEE NOTE 1
PROGRAMMING ONLY.
S8B1
BL
BL
RD
RD
YL
YL
YL
BK
WH
GR/YL
GR/YL
YL
GR
YL
YL
YL
BK
BK
WH
WH
BK
BK
BK
BK
BL
RD
BK
BK
WH
WH
YL
YL
OR
OR
BURNER
BOX GND
BK
PANEL LOOP
YL
WH
WH WH
RD/WHRD/WH
BL/WHBL/WH
BK/WHBK/WH
BK
BK
BLBL
OR/WHOR/WH
YL/WHYL/WH
BK
BK
WH
WH
DEFAULT BLOWER MOTOR TAP SELECTIONS
COF (CONSTANT FAN): TAP 1
COP (COOLING / HP): TAP 7
HT ( GAS HEAT): TAP 5
®
VENT
MOTOR
(INDUCER)
**
1
2
3
IGN
ILI
TR
PS
HLO
MVC
TH
GND
MV
HLI
FP
WRG B/C Y/Y1
THERMOSTAT
LINE-H
CIRC-H
TNS-H
TNS-N
CIRC-N
LINE-N
IGN-H
IND-H
IND-N
IGN-N
1
2
3
4
5
6
7
8
9
10
1
2
3
4
4
3
1
3
2
1
IFC
TAP1
TAP2
TAP3
TAP4
TAP5
GND
1
2
3
4
5
6
JUNCTION BOX
120v 60 Hz. 1 PH
POWER SUPPLY PER LOCAL CODE
H N
GND
24v 120v
TNS
GAS
VALVE
MV
C
FLAME_ROLLOUT1
FLAME_ROLLOUT2
RAF-1
THERMAL_LIMIT
REGAL
ENSITE
--------
BLOWER
MOTOR
N
4
3
2
1
G
L
5
COM
PS
FLAME PROBE
1
2
RAF-2
2
1
LINE CHOKE
ALTERNATE
-------
BLOWER
MOTOR
G
N
4
3
2
1
L
C
5
TO: IFC CIRC-N-3 WH
TO: LINE CHOKE BK
TO: IFC GND-6 BL
TO: IFC TAP1-1 RD/WH
TO: IFC TAP2-2 YL/WH
TO: IFC TAP3-3 BL/WH
TO: IFC TAP4-4 BK/WH
TO: IFC TAP5-5 OR/WH
GR/BK
BLOWER
HOUSING
GND
BLOWER
HOUSING
GND
S8B1

S8XB-SF-2B-EN 13
BK BLACK GR GREEN
WH WHITE BR BROWN
YL YELLOW RD RED
OR ORANGE BL BLUE
YL/44 YL/43
WH/40
WH/40
BK/WH/38
YL/46 YL/52
WH/17
WH/17
WH/21
WH/21
BK/22
BK/22
WH/20
BK/18
BL/2
BL/2
BL/5
BL/5
RD/6
RD/6
RD/9
RD/9
GR/8
WH/12
YL/50
YL/50
YL/49
YL/49
GR/YL/31
1
3
/LY/RG
YL/51
YL/51
YL/48
YL/48
BK/29
BK/29
OR/11
OR/11
YL/47
YL/47
BOX HARN
TO BURNER
BURNER BOX GND
NOTES:
1. IF ANY OF THE ORIGINAL WIRING AS SUPPLIED WITH THIS FURNACE MUST BE REPLACED, IT MUST BE WITH WIRE
HAVING A TEMPERATURE RATING OF AT LEAST 105°C. WIRES 12, 18, 20, 48, 49, 50, 51, 92, 93 MUST BE RATED TO 250°C.
2. COOLING / HEAT PUMP SYSTEMS - Y1 AND/OR Y2 MUST CONNECT FROM THE THERMOSTAT TO THE IFC LOW
VOLTAGE TERMINALS FOR PROPER AIRFLOW. SEE INSTALLER’S GUIDE FOR FIELD WIRING.
3. THE INDOOR BLOWER MOTOR AIRFLOW TABLES ARE LOCATED IN THE SERVICE FACTS.
TO CHANGE AIRFLOW USE THE MENU/OPTIONS BUTTONS.
4. LINE CHOKE AND WIRE BK/28 ONLY USED ON MODELS WITH 1 HP MOTORS.
5. FLAME SENSE TEST PADS: 1 VDC = 1 MICROAMP. FLAME CURRENT CAN VARY
DEPENDING ON THE VOM THAT IS USED AND THE VOLTAGE SUPPLIED TO
THE FURNACE. THE ACCEPTABLE RANGE IS 0.75-3 MICROAMPS.
S8X1
SEE NOTE 2
ELECTRICAL RATING
INPUT: 24VAC, 60 HZ.
TNS SEC. CURRENT: 450MA.
+ MV LOAD
MV OUTPUT: 1.5A @ 24 VAC
IND OUTPUT: 2.2 FLA, 3.5 LRA
@120 VAC
IGN OUTPUT: 2.0 A @ 120 VAC
CIRC. BLOWER OUTPUT:
14.5 FLA, 25 LRA @ 120 VAC
HUMIDIFIER & AIR CLEANER
(DRY CONTACTS)
MAX. LOAD: 1.0A @ 120VAC
24 VAC OR 120 VAC MAY BE
USED
FUSE: 5A
INTEGRATED FURNACE CONTROL
LINE
24 V
LINE
24 V
FIELD
WIRING
FACTORY
WIRING
RAF REVERSE
AIR FLOW
PS PRESSURE
SWITCH
FRS FLAME ROLLOUT
SWITCH
FP FLAME PROBE
IGN HOT SURFACE
IGNITER
** INTERNAL THERMAL PROTECTION
FUSE
GROUND
SEE NOTE 6
PANEL LOOP
H LINE
N NEUTRAL
GND GROUND
HLO HIGH LIMIT
OUTPUT
HLI HIGH LIMIT
INPUT
PS PRESSURE SWITCH
INPUT
IND INDUCER
IFC INTEGRATED
FURNACE
CONTROL
RAF REVERSE
AIR FLOW
TH 24VAC (HOT)
TR 24VAC (COMMON)
MVC MAIN VALVE
COMMON
MVC MAIN VALVE
TNS TRANSFORMER
ILI INDUCER LIMIT
INPUT
IGN IGNITER
FP FLAME PROBE
YL/45
YL/45
WH/15
WH/15
WH/16
WH/16
YL/3
YL/3
BK/39
BK/39
YL/WH/36
BL/WH/37
BK/14
BK/14
BK/13
BK/13
BK/WH/26
BK/WH/26
BL/WH/25
BL/WH/25
YL/WH/24
YL/WH/24
RD/WH/23
RD/WH/23
RD/WH/35
BK/28
BK/28
BL/57
BL/57
OR/WH/56
OR/WH/56
OR/WH/55
BL/42
BL/42
BK/30
BK/27
SEE NOTE 4
LC LINE CHOKE
YL/46
YL/52
TIMINGS
PREPURGE: 0 SEC.
INTERPURGE: 60 SEC.
POST PURGE: 5 SEC.
IGN WARMUP: 20 SEC.
IAP: 3; TFI: 5 SEC.
RETRIES: 2 RECYCLES: 10
HEAT ON DELAY: UP TO 30 SEC.
COOL ON DELAY: 0 SEC.
AUTO RESTART: 60 MIN.
AUTO RESTART PURGE: 60 SEC.
1 Stage Inducer with CTM Blower Motor
D345844P01 REV F
HOd Heat Off Delay (sec)
IdL Idle COF Blower Tap for Continuous Fan
Ht Heating COP Blower Tap for 1st
tP Blower Tap Number Stage Compressor Mode
COF Continuous Fan Blower Tap for 2nd E05
CP1 Cooling/Heat Pump Mode Stage Compressor Mode
dft Defrost Mode HtP Blower Tap for Heating Mode
nUr
Orn Orientation
Err Active Alarm Menu
L6F Last 6 Faults (To Clear, Flame current is low, but still
Hold Option Button 5 sec) strong enough to allow operation
Cr Code Release Number (1) Gas valve not energized
COd Cooling Off Delay (sec) (2) Gas valve relay stuck closed
OdU Outdoor Unit Open fuse
Open Pressure Switch
(1) Igniter relay fails
Status Codes
Menu Options
Open Thermal Limit, Rollout Switch,
or Reverse Airflow Switch
Shorted Pressure Switch
Flame detected, should not be present
Voltage reversed polarity
Bad Grounding
Error Codes
Run Test Mode
Recycles exceeded (loss of
established flame or PS open x10)
Gas Valve not energized when it
should be exceeded after 10 times
Loss of IRQ or internal failures
Retry exceeded (Failed to est flame)
(2) Igniter open
Gas valve is energized whenit should be off
BK/92
WH/93
BUTT SPLICE-WITH HEAT SHRINK
BUTT SPLICE-WITH HEAT SHRINK
X
X
24v 120v
TNS
VENT
MOTOR
(INDUCER)
**
GAS
VALVE
MV C
RAF-1
IGN
PS
X
THERMAL_LIMIT
FLAME_ROLLOUT2
FLAME_ROLLOUT1
FLAME_PROBE
FP
HLI
MV
GND
TH
MVC
HLO
PS
TR
ILI (NOT USED)
IGN-N
IND-N
IND-H
IGN-H
IFC
EAC
HUM
LINE
NEUTRAL
WR G
B/C Y/Y1
THERMOSTAT
FP
MENU OPTION
TAP1
TAP2
TAP3
TAP4
TAP5
GND
LINE-N CIRC-N (blocked) TNS-N
TNS-H CIRC-H LINE-H
3 2 1 4 3 12
Y2
24 / 120 VAC
MAY BE USED
1
2
2
1
1
2
JUNCTION BOX
120v 60 Hz. 1 PH
POWER SUPPLY PER LOCAL CODE
H N
GND
X
RAF-2
10
9
8
7
6
5
4
3
2
1
1
2
3
4
121110987654321
123456789101112
6
5
4
3
2
1
123
1234
1
2
2
1
1
2
3
LINE CHOKE
BLOWER
MOTOR
N
G
L
COM
1
2
3
4
5
6
1
2
3
S1
12
S2
12
BLOWER
HOUSING
GND
C1.
C2.
H1.
E2.1
E2.2
E2.3
E3.1
E3.2
E04
E6.1
E01
E6.2
E6.3
E7.1
E08
E12
E11
SEE NOTE 1
SEE NOTE 1
BL
BL
RD
RD
YL
YL
YL
BK
WH
GR/YL GR/YL
YL
GR
YL
YL
YL
BK
BK
WH
WH
BK
BK
BK
BK
BL
RD
BK
BK
WH
WH
YL
YL
OR
OR
BURNER
BOX GND
BK
PANEL LOOP
YL
WH
WH WH
RD/WHRD/WH
BL/WHBL/WH
BK/WHBK/WH
BK
BK
BLBL
OR/WHOR/WH
YL/WHYL/WH
BK
BK
WH
WH
DEFAULT BLOWER MOTOR TAP SELECTIONS
COF (CONSTANT FAN): TAP 1
CL1 (FIRST STAGE COOLING): TAP 3
CL2 (SECOND STAGE COOLING): TAP 7
HT1 (FIRST STAGE HEAT): TAP 5
VENT
MOTOR
(INDUCER)
**
1
2
3
IGN
ILI
TR
PS
HLO
MVC
TH
GND
MV
HLI
FP
WRG B/C Y/Y1
THERMOSTAT
LINE-H
CIRC-H
TNS-H
TNS-N
CIRC-N
LINE-N
IGN-H
IND-H
IND-N
IGN-N
1
2
3
4
5
6
7
8
9
10
1
2
3
4
4
3
1
3
2
1
IFC
TAP1
TAP2
TAP3
TAP4
TAP5
GND
1
2
3
4
5
6
Y2
JUNCTION BOX
120v 60 Hz. 1 PH
POWER SUPPLY PER LOCAL CODE
H N
GND
24v 120v
TNS
GAS
VALVE
MV
C
FLAME_ROLLOUT1
FLAME_ROLLOUT2
RAF-1
THERMAL_LIMIT
BLOWER
MOTOR
N
4
3
2
1
G
L
5
COM
PS
FLAME PROBE
1
2
RAF-2
2
1
LINE CHOKE
S8X1
WWiirriinngg DDiiaaggrraammss

14 S8XB-SF-2B-EN
BK BLACK
WH WHITE
YL YELLOW
OR ORANGE
GR GREEN
BR BROWN
RD RED
BL BLUE
YL/44 YL/43
WH/40
WH/40
BK/39
BK/39
BK/WH/38
YL/WH/36
OR/WH/55
BL/WH/37
YL/46
YL/46
YL/52
YL/52
WH/16
WH/16
BK/28
BK/28
BK/WH/26
BK/WH/26
YL/WH/24
YL/WH/24
RD/WH/23
RD/WH/23
BL/57
BL/57
BK/14
BK/14
WH/17
WH/17
WH/15
WH/15
WH/21
WH/21
BK/22
BK/22
WH/20
RD/19
BK/18
BL/2
BL/2
YL/3
YL/3
BL/5
BL/5
RD/6
RD/6
BR/7
BR/7
BR/53
BR/53
RD/9
RD/9
GR/8
BR/10
BR/10
WH/12
YL/50
YL/50
YL/49
YL/49
BK/13
BK/13
GR/YL/31
GR/YL/31
YL/51
YL/51
YL/48
YL/48
BK/29
BK/29
OR/11
OR/11
YL/47
YL/47
BOX HARN
TO BURNER
BK/30
BURNER BOX GND
NOTES:
1. IF ANY OF THE ORIGINAL WIRING AS SUPPLIED WITH THIS FURNACE MUST BE REPLACED, IT MUST BE WITH WIRE HAVING A TEMPERATURE RATING OF AT
LEAST 105°C. WIRES 12, 18, 48, 49, 50, 51, 92, 93, AND 94 REQUIRE A TEMPERATURE RATING OF AT LEAST 250°C.
2. FOR PROPER AIRFLOW IN COOLING/HEAT PUMP MODES, Y1AND/OR Y2 MUST CONNECT FROM THE THERMOSTAT TO THE IFC LOW VOLTAGE TERMINAL STRIP.
3. FOR COOLING ONLY SYSTEMS, LEAVE Y1-O JUMPER IN PLACE ON THE IFC FOR CORRECT LED READOUT.
4. FOR HEAT PUMP SYSTEMS, REMOVE THE Y1-O JUMPER, CONNECT "O" FROM THE THERMOSTAT TO "O" ON THE IFC LOW VOLTAGETERMINAL
STRIP FOR CORRECT LED READOUT.
5. IF USING A SINGLE STAGE HEATING THERMOSTAT, JUMPER W1 AND W2 TERMINALS AT THE LOW VOLTAGE TERMINAL STRIP. HT2 WILL
BE SHOWN ON THE SEVEN SEGMENT DISPLAY AT ALL TIMES. SECOND STAGE OPERATION WILL BEGIN AFTER THE INTERSTAGE DELAY HAS COMPLETED.
6. AIRFLOW TABLES ARE LOCATED IN THE SERVICE FACTS. TO CHANGE AIRFLOW, REFER TO THE NTEGRATED FURNACE CONTROL MENU AND OPTIONS
TO SET AIRFLOW AND BLOWER DELAYS.
7. LINE CHOKE AND WIRE BK/28 ONLY USED ON MODELS WITH 1 HP MOTORS.
8. WIRE YL/45 AND RAF-2 ARE NOT PRESENT ON DOWNFLOW MODELS.
9. FLAME SENSE TEST PADS: 1 VDC = 1 MICROAMP. FLAME CURRENT CAN VARY DEPENDING ON THE VOM THAT
IS USED AND THE VOLTAGE SUPPLIED TO THE FURNACE. THE ACCEPTABLE RANGE IS 0.75-3 MICROAMPS.
SEE NOTES 2, 3, 4, 5
BK/27
ELECTRICAL RATING
INPUT: 24 VAC, 60 HZ.
TNS SEC. CURRENT: 450 MA.
+ MV LOAD
MV OUTPUT: 1.5A @ 24 VAC
IND OUTPUT: 2.2 FLA, 3.5 LRA
@ 120 VAC
IGN OUTPUT: 2.0 A @ 120 VAC
CIRC. BLOWER OUTPUT: 14.5 FLA,
25 LRA @ 120 VAC
HUMIDIFIER @& AIR CLEANER
(DRY CONTACTS)
MAX. LOAD: 1.0 A @ 120 VAC
24 VAC OR 120 VAC MAY BE USED
FUSE: 5A
INTEGRATED FURNACE CONTROL
LINE
24 V
LINE
24 V
FIELD
WIRING
FACTORY
WIRING
RAF REVERSE
AIR FLOW
PS PRESSURE
SWITCH FRS FLAME
ROLLOUT SWITCH
FP FLAME PROBE
IGN HOT SURFACE
IGNITER
** INTERNAL THERMAL PROTECTION
FUSE
LC LINE CHOKE GROUND
SEE NOTE 9
PANEL LOOP
H LINE
N NEUTRAL
GND GROUND
HLO HIGH LIMIT OUTPUT
HLI HIGH LIMIT INPUT
PS1 1ST STAGE PRESSURE
INPUT
PS2 2ND STAGE PRESSURE
INPUT
IND INDUCER
IFC INTEGRATED FURNACE
CONTROL
RAF REVERSE AIR FLOW
TH 24VAC (HOT)
TR 24VAC (COMMON)
MVC VALVE COMMON
MVL VALVE LOW STAGE
MVH VALVE HIGH STAGE
TNS TRANSFORMER
ILI INDUCER LIMIT INPUT
IGN IGNITER
FP FLAME PROBE
HI SECOND STAGE
LO FIRST STAGE
YL/45
YL/45
SEE NOTE 7
BL/42
BL/42
RD/WH/35
BL/WH/25
BL/WH/25
OR/WH/56
OR/WH/56
TIMINGS
PREPURGE: 0 SEC.
INTERPURGE: 60 SEC.
POST PURGE: 5 SEC.
IGN WARMUP: 20 SEC.
IAP: 3; TFI: 5 SEC.
RETRIES: 2 RECYCLES: 10
HEAT ON DELAY: 30 SEC.
COOL ON DELAY: 0 SEC.
AUTO RESTART: 60 MIN.
AUTO RESTART PURGE: 60 SEC.
2 Stage Inducer with CTM Blower Motor
D345847P01 REV E
dOH
IdL Idle dsI
Ht1 1st Stage Heating POC
Ht2 2nd Stage Heating
tP Blower Tap Number
COF Continuous Fan
CL1 1st Stage Cooling HtP Blower Tap for 1st Stage Heating
CL2 2nd Stage Cooling Blower Tap for 2nd dtage Heating
HP1 1st Stage Heat Pump nUr
HP2 2nd Stage Heat Pump E09
dft Defrost Mode
Orn Orientation
Err Active Alarm Menu
L6F Last 6 Faults (To Clear,
Hold Option Button 5 sec)
Cr Code Release Number
COd Cooling Off Delay (sec) E12 Open fuse
OdU Outdoor Unit Type
Voltage reversed polarity
1st stage gas valve (MVL) is energized when it should be off
Flame current is low, but still strong enough to allow operation
Open Inducer Limit Switch or Condensate Switch
(5) 2nd stage gas valve not energized
when it should be
(4) 2nd stage gas valve energized
when it should not be
Error Codes
Heat Off Delay (sec)
Inter-Stage Delay
Loss of IRQ or internal failures
Recycles exceeded (loss of established
flame or PS open x10)
Open Thermal Limit, Rollout Switch, or Reverse Airflow Switch
(2) 1st stage gas valve relay stuck closed
Status Codes
Menu Options
Flame detected, should not be present
Open Pressure Switch, 2nd Stage
Bad Grounding
(1) Igniter relay fails
(2) Igniter open
(1) 1st stage gas valve not energized when it should be
Blower Tap for 1st Stage
Compressor Mode
Blower Tap for 2nd Stage
Compressor Mode
Retry exceeded (Failed to est flame)
Run Test Mode
Open Pressure Switch, 1st Stage
Shorted Pressure Switch, 1st Stage
(3) 2nd stage gas valve relay stuck closed
Shorted Pressure Switch, 2nd Stage
1st Stage Gas Valve not energized when it
should be exceeded after 10 times
BUTT SPLICE-WITH HEAT SHRINK
BUTT SPLICE-WITH HEAT SHRINK
BK/92
BLOWER
HOUSING
GND
X
X
24v 120v
TNS
VENT
MOTOR
(INDUCER)
**
GAS
VALVE
1 2 3
RAF-1
IGN
PS1
PS2
X
THERMAL_LIMIT
FLAME_ROLLOUT2
FLAME_ROLLOUT1
FLAME_PROBE
LINE CHOKE
FP
HLI
MVH
MVL
GND
PS2
TH
MVC
HLO
PS1
TR
ILI (NOT USED)
TNS-H CIRC-H LINE-H
LINE-N (blocked) CIRC-N TNS-N
IGN-N
IND-N
IND-LO
IND-HI
IGN-H
IFC
EAC
HUM
LINE
NEUTRAL
4
3
W2 W1 R G B/C Y2 Y1 O
THERMOSTAT
FP
1
21
2
3
MENU OPTION
TAP1
TAP2
TAP3
TAP4
TAP5
GND
24 / 120 VAC
MAY BE USED
1
2
3
12
11
10
9
8
7
6
5
4
3
2
1
1
2
3
4
51
2
2
1
1
2
JUNCTION BOX
120v 60 Hz. 1 PH
POWER SUPPLY PER LOCAL CODE
H N
GND
X
RAF-2
121110987654321
1 2 3 4 5 6 7 8 9 10 11 12
6
5
4
3
2
1
2
1
1
2
123
1234
123
BLOWER
MOTOR
N
G
L
COM
1
2
3
4
5
6
1
2
3
S1
12
S2
12
S3
12
C1
.2C
H1
.2H
E21
E2. 2
E01
E2. 3
E3.1
E3. 2
E3. 3
E3. 4
E04
E05
E6.1
E6. 2
E6. 3
E7.1
E08
E11
SEE NOTE 1
SEE NOTE 1
*SEE NOTE
8
.
S8X2
.
.
.
.
RD/WHRD/WH
YL/WH YL/WH
BK/WH BK/WH
BL/WHBL/WH
BR
BR
BL
BL
RDRD
YL
YL
YL
BK
RD
WH
GR/YL GR/YL
YL
GR
YL
YL
YL
WH WH
BK
BK
WH
WH
BK
BK
BK
BK BK
BK
BL
RD
BR
BR
BR
BR
BK
BK
WH
WH
YL
YL
OR
OR
WH
BURNER
BOX GND
BK
BK
BK
PANEL LOOP
YL
OR/WH OR/WH
BL BL
DEFAULT BLOWER MOTOR TAP SELECTIONS
COF (CONSTANT FAN): TAP 1
CL1 (FIRST STAGE COOLING): TAP 3
CL2 (SECOND STAGE COOLING): TAP 7
HT1 (FIRST STAGE HEAT): TAP 2
HT2 (SECOND STAGE HEAT): TAP 5
WH
WH
VENT
MOTOR
(INDUCER)
**
1
2
3
IGN
ILI
TR
PS1
HLO
MVC
TH
PS2
GND
MVL
MVH
HLI
FP
W2 W1 R G B/C Y2
Y1
O
THERMOSTAT
LINE-H
CIRC-H
TNS-H
TNS-N
CIRC-N
LINE-N
IGN-H
IND-HI
IND-LO
IND-N
IGN-N
TAP1
TAP2
TAP3
TAP4
TAP5
GND
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
1
2
3
4
5
4
3
1
3
2
1
IFC
JUNCTION BOX
120v 60 Hz. 1 PH
POWER SUPPLY PER LOCAL CODE
H N
GND
LINE CHOKE
24v 120v
TNS
GAS
VALVE
1
2
3
FLAME_ROLLOUT1
FLAME_ROLLOUT2
RAF-1
THERMAL_LIMIT
PS2
PS1
FLAME PROBE
1
2
RAF-2
BLOWER
MOTOR
N
4
3
2
1
G
L
5
COM
2
1
S8X2
WWiirriinngg DDiiaaggrraammss

S8XB-SF-2B-EN 15
Airflow Tables
Furnace Airflow (CFM) Vs. External Static Pressure (in. W.C.)
Model Tap 0.1 0.3 0.5 0.7 0.9
S8B1B080M4PSBA
S8X1B080M4PSBA
S8X2B080M4PSBA
1 633 297 — — —
2 957 800 719 428 213
3 1220 1080 940 800 660
4 1403 1298 1192 1087 981
5 1524 1428 1336 1248 1164
6 1684 1574 1544 1401 1337
7 1700 1625 1551 1476 1401
8 1858 1790 1723 1656 1589
9 1967 1898 1829 1760 1691
Furnace Airflow (CFM) Vs. External Static Pressure (in. W.C.)
Model Tap 0.1 0.3 0.5 0.7 0.9
S8B1D120M5PSBA
S8X1D120M5PSBA
S8X2D120M5PSBA
1 748 540 328 114 —
2 1192 1003 812 617 420
3 1559 1389 1217 1041 862
4 1944 1798 1649 1497 1342
5 2117 1984 1847 1708 1565
6 2234 2111 1985 1855 1723
7 2377 2267 2155 2040 1921
8 2516 2426 2332 2235 2135
9 2571 2490 2406 2319 2229

16 S8XB-SF-2B-EN
CFM Versus Temperature Rise
S8B1/S8X1 Furnaces have one stage heating
S8X2 Furnaces have two stage heating. First Stage is Low heating and Second Stage is High heating.
Table 1. S8B1/S8X1
Model
CFM Versus Temperature Rise
400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400
S8*1B080M4PSBA 59 54 49 46 42 40 37 35 33
S8*1D120M5PSBA 59 56 52 49 47 44 42 40 39 37
Table 2. S8X2 — Low Heat
Model
CFM Versus Temperature Rise — First Stage (Low) Heating
400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400
S8X2B080M4PSBA 55 48 43 39 35 32 30 28
S8X2D120M5PSBA 57 52 48 44 41 39 37 35 33 31
Table 3. S8X2 — High Heat
Model
CFM Versus Temperature Rise — Second Stage (High) Heating
400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400
S8X2B080M4PSBA 59 54 49 46 42 40 37 35 33
S8X2D120M5PSBA 59 56 52 49 47 44 42 40 39 37

S8XB-SF-2B-EN 17
Integrated Furnace Control Menu
IdL
STATUS MENU
Err
ACTIVE ERRORS
Ht tp5
Example
Gas Heat
Example
Tap 5
E3.1
Example
Pressure Switch Error
L6F
LAST 6 FAULTS E3.1 E04
Example
Pressure Switch Error
Example
Open Limit Switch Error
CR1
Control Release # CR
Example
So!ware Version #
COd
Cooing Off Delay 000 090 180
Example
seconds
ODU
Outdoor Stages 1-1 2-1
HOD
Heat Off Delay 100 060
Example
seconds
ISD
Inter-Stage Delay 600 000
Example
seconds
300 900
CFP
Con$nuous Fan Tap CF.1
Example
Tap #
COP
Compressor Opera$on
Speed Tap
Example
Tap #
Example
1
st
Stage Tap #
S8B1 - S8X1
Control System Menu Single Stage OD
140
CLEARING THE LAST6 FAULTS:
To clear the stored faults, scroll to the last 6 faults menu, enter the menu by scrolling to the right and hold the “Op$on” key for at least 5 seconds. Release and a set of 3 dashes will be seen 3 $mes. This confirms the faults have been cleared.
SETTING UP YOUR SYSTEM:
To change any factory default value, first remove any “call” from the furnace and allow all fan off delays to finish. (IDL should be seen on the display) Scroll to the selected Menu item by momentarily depressing the “MENU” key and then depress the “OPTION” key to the desired se&ng. Then momentarily depress the “MENU” key again to save the change.
180
C1.7 C1.1 C1.2 C1.3 C1.4
HtP
Hea$ng Speed Tap H1.5 H1.1
01
H1.2 H1.6H1.3
Example
Single Stage
Example
2 stage 1 compressor
SELECTING GAS HEAT FAN SPEEDS: Airflow can be adjusted while the unit is running. Scroll to the HTP menu and momentarily push the OPTION key. Tap #5 is the default se&ng for all models. When selec$on is made, momentarily push the MENU key to save. If the temperature rise is too high, increase airflow. If the temperature rise too low, decrease airflow. NOTE: Tap 9 is not available for gas hea$ng.
run
Run Test Mode
C1.5 C1.6 C1.8 C1.9
H1_7 H1.8H1.4
ORN
LED Orienta$on UP dn
Default Airflow Taps
Gas Heat = Tap 5 ODU Menu 1-1 Cooling / HP = Tap 7
SELECTING COOLING/HP FAN SPEEDS for 1-1 ODU: Airflow can be adjusted while the unit is running. Scroll to the COP menu and momentarily push the OPTION key. Tap 7 is the default se&ng for all models. When selec$on is made, momentarily push the MENU key to save.
Con$nuous Fan Con$nuous fan cannot be adjusted
Designated Gas Hea$ng Airflow Taps
S8*1B080M4PSBA (1-6) S8*1D120M5PSBA (1-8)

18 S8XB-SF-2B-EN
Example
Tap #
IdL
STATUS MENU
Err
ACTIVE ERRORS
Ht tp5
Example
Gas Heat
Example
Tap 5
E3.1
Example
Pressure Switch Error
L6F
LAST 6 FAULTS E3.1 E04
Example
Pressure Switch Error
Example
Open Limit Switch Error
CR1
Control Release # CR
Example
So!ware Version #
COd
Cooing Off Delay 000 090 180
Example
seconds
ODU
Outdoor Stages 1-1 2-1
HOD
Heat Off Delay 100 060
Example
seconds
ISD
Inter-Stage Delay 600 000
Example
seconds
300 900
CFP
Con$nuous Fan Tap CF.1
Example
Tap #
COP
Compressor Opera$on
Speed Tap
Example
Tap #
S8X1
Control System Menu Two Stage OD
140
CLEARING THE LAST6 FAULTS:
To clear the stored faults, scroll to the last 6 faults menu, enter the menu by scrolling to the right and hold the “Op$on” key for at least 5 seconds. Release and a set of 3 dashes will be seen 3 $mes. This confirms the faults have been cleared.
SETTING UP YOUR SYSTEM:
To change any factory default value, first remove any “call” from the furnace and allow all fan off delays to finish. (IDL should be seen on the display) Scroll to the selected Menu item by momentarily depressing the “MENU” key and then depress the “OPTION” key to the desired se&ng. Then momentarily depress the “MENU” key again to save the change.
180
C1.3 C1.1 C1.2
C2.7 C2.4
HtP
Hea$ng Speed Tap H1.5 H1.1
001
H1.2 H1.6
H1.3
Example
Single Stage
Example
2 stage 1 compressor
run
Run Test Mode
C2.5 C2.6 C2.8 C2.9
H1_7 H1.8H1.4
Default Airflow Taps
Gas Heat = Tap 5 ODU Menu 2-1 1
st
Stage Cooling / HP = Tap 3
2
nd
Stage Cooling / HP = Tap 7
ORN
LEDOrienta$on UP dn
SELECTING COOLING / HP FAN SPEEDS for 2-1 ODU: Airflow can be adjusted while the unit is running. 1st Stage Airflow: Scroll to the COP menu and momentarily push the OPTION key. Tap #3 is the default 1st stage se&ng for all models. When selec$on is made, momentarily push the MENU key to save.(change will not be applied un$l 2nd stage airflow tap is saved) 2nd Stage Airflow: A!er 1st stage airflow is selected, the default 2nd stage airflow tap will appear, C2_7. If this tap is desired, momentarily push the MENU key to save. Important: If a change is made to either 1st or 2nd stage airflow, both must be saved by pushing the MENU key. Neither selec$on will be saved if this is not done.
SELECTING GAS HEATING FAN SPEEDS: Airflow can be adjusted while the unit is running. Scroll to the HTP menu and momentarily push the OPTION key. Tap #5 is the default se&ng for all models. When selec$on is made, momentarily push the MENU key to save. If the temperature rise is too high, increase airflow. If the temperature rise too low, decrease airflow. NOTE: Tap 9 is not available for gas hea$ng.
Con$nuous Fan Con$nuous fan cannot be adjusted
Designated Gas Hea$ng Airflow Taps S8*1B080M4PSBA (1-6)
S8*1D120M5PSBA (1-8)
IInntteeggrraatteedd FFuurrnnaaccee CCoonnttrrooll MMeennuu

S8XB-SF-2B-EN 19
IdL
STATUS MENU
Err
ACTIVE ERRORS
Ht1 tp2
Example
1
st
stage Gas Heat
Example
Tap 2
E3.4
Example
2
nd
Stage Pressure Switch
Error
E3.1
Example
1st Stage Pressure Switch
Error
L6F
LAST 6 FAULTS E3.4 E3.1 E04
Example
2
nd
Stage Pressure Switch
Error
Example
1st Stage Pressure Switch
Error
Example
Open Limit Switch Error
CR1
Control Release # CR
Example
So!ware Version #
COd
Cooing Off Delay 000 090 180
Example
seconds
ODU
Outdoor Stages 1-1 2-1
HOD
Heat Off Delay 100 060
Example
seconds
ISD
Inter-Stage Delay 600 000
Example
seconds
300 900
CFP
Con$nuous Fan Tap CF.1
Example
Tap #
COP
Compressor Opera$on
Speed Tap
Example
Tap #
Example
1
st
Stage Tap #
S8X2
Control System Menu Single Stage OD
140
CLEARING THE LAST6 FAULTS:
To clear the stored faults, scroll to the last 6 faults menu, enter the menu by scrolling to the right and hold the “Op$on” key for at least 5 seconds. Release and a set of 3 dashes will be seen 3 $mes. This confirms the faults have been cleared.
SETTING UP YOUR SYSTEM:
To change any factory default value, first remove any “call” from the furnace and allow all fan off delays to finish. (IDL should be seen on the display) Scroll to the selected Menu item by momentarily depressing the “MENU” key and then depress the “OPTION” key to the desired se&ng. Then momentarily depress the “MENU” key again to save the change.
180
C1.7 C1.1 C1.2 C1.3 C1.4
HtP
Hea$ng Speed Tap H1.2 H1.1
001
H1.3
H2.6
H1.4
Example
Single Stage
Example
2 stage 1 compressor
run
Run Test Mode
C1.5 C1.6 C1.8 C1.9
H2_7 H2.8H2.5
Default Airflow Taps
1
st
Stage Gas Heat = Tap 2
2
nd
Stage Gas Heat = Tap 5
ODU Menu 1-1 Cooling / HP = Tap 7
ORN
LED Orienta$on UP dn
SELECTING COOLING/HP FAN SPEEDS for 1-1 ODU: Airflow can be adjusted while the unit is running. Scroll to the COP menu and momentarily push the OPTION key. Tap 7 is the default se&ng for all models. When selec$on is made, momentarily push the MENU key to save.
Con$nuous Fan Con$nuous fan cannot be adjusted
SELECTING GAS HEAT FAN SPEEDS: Airflow can be adjusted while the unit is running. 1st Stage Airflow: Scroll to the HTP menu and momentarily push the OPTION key. Tap #2 is the default 1st stage se&ng for all models. When selec$on is made, momentarily push the MENU key to save. (change will not be applied un$l 2nd stage airflow tap is saved) See designated 1st stage hea$ng taps available for each model. 2nd Stage Airflow: A!er 1st stage airflow is selected, the default 2nd stage airflow tap will appear, H2_5. If this tap is desired, momentarily push the MENU key to save. If the temperature rise is toohigh, increase airflow. If the temperature rise toolow, decrease airflow. NOTE: Tap 9 is not available for gas hea$ng. Important: If a change is made to either 1st or 2nd stage airflow, both must be saved by pushing the MENU key. Neither selec$on will be saved if this is not done.
Designated 1st Stage Gas Hea$ng Airflow Taps S8X2B080M4PSBA (1-6)
S8X2D120M5PSBA (1-5)
IInntteeggrraatteedd FFuurrnnaaccee CCoonnttrrooll MMeennuu

20 S8XB-SF-2B-EN
Example
1
st
Stage Tap #
IdL
STATUS MENU
Err
ACTIVE ERRORS
Ht1 tp2
Example
1
st
stage Gas Heat
Example
Tap 2
E3.4
Example
2
nd
Stage Pressure Switch
Error
E3.1
Example
1st Stage Pressure Switch
Error
L6F
LAST 6 FAULTS E3.4 E3.1 E04
Example
2
nd
Stage Pressure Switch
Error
Example
1st Stage Pressure Switch
Error
Example
Open Limit Switch Error
CR1
Control Release # CR
Example
So!ware Version#
COd
Cooing Off Delay 000 090 180
Example
seconds
ODU
Outdoor Stages 1-1 2-1
HOD
Heat Off Delay 100 060
Example
seconds
ISD
Inter-Stage Delay 600 000
Example
seconds
300 900
CFP
Con$nuous Fan Tap CF.1
Example
Tap #
COP
Compressor Opera$on
Speed Tap
Example
Tap #
S8X2
Control System Menu Two Stage OD
140
CLEARING THE LAST6 FAULTS:
To clear the stored faults, scroll to the last 6 faults menu, enter the menu by scrolling to the right and hold the “Op$on” key for at least 5 seconds. Release and a set of 3 dashes will be seen 3 $mes. This confirms the faults have been cleared.
SETTING UP YOUR SYSTEM:
To change any factory default value, first remove any “call” from the furnace and allow all fan off delays to finish. (IDL should be seen on the display) Scroll to the selected Menu item by momentarily depressing the “MENU” key and then depress the “OPTION” key to the desired se&ng. Then momentarily depress the “MENU” key again to save the change.
180
C1.3 C1.1 C1.2
C2.7 C2.4
HtP
Hea$ng Speed Tap H1.2 H1.1
001
H1.3
H2.6
H1.4
Example
Single Stage
Example
2 stage 1 compressor
run
Run Test Mode
C2.5 C2.6 C2.8 C2.9
H2_7 H2.8H2.5
Default Airflow Taps
1
st
Stage Gas Heat = Tap 2
2
nd
Stage Gas Heat = Tap 5
ODU Menu 2-1 1
st
Stage Cooling / HP = Tap 3
2
nd
Stage Cooling / HP = Tap 7
ORN
LEDOrienta$on UP dn
SELECTING COOLING / HP FAN SPEEDS for 2-1 ODU: Airflow can be adjusted while the unit is running. 1st Stage Airflow: Scroll to the COP menu and momentarily push the OPTION key. Tap #3 is the default 1st stage se&ng for all models. When selec$on is made, momentarily push the MENU key to save.(change will not be applied un$l 2nd stage airflow tap is saved) 2nd Stage Airflow: A!er 1st stage airflow is selected, the default 2nd stage airflow tap will appear, C2_7. If this tap is desired, momentarily push the MENU key to save. Important: If a change is made to either 1st or 2nd stage airflow, both must be saved by pushing the MENU key. Neither selec$on will be saved if this is not done.
Con$nuous Fan Con$nuous fan cannot be adjusted
SELECTING GAS HEAT FAN SPEEDS: Airflow can be adjusted while the unit is running. 1st Stage Airflow: Scroll to the HTP menu and momentarily push the OPTION key. Tap #2 is the default 1st stage se&ng for all models. When selec$on is made, momentarily push the MENU key to save. (change will not be applied un$l 2nd stage airflow tap is saved) See designated 1st stage hea$ng taps available for each model. 2nd Stage Airflow: A!er 1st stage airflow is selected, the default 2nd stage airflow tap will appear, H2_5. If this tap is desired, momentarily push the MENU key to save. If the temperature rise is too high, increase airflow. If the temperature rise too low, decrease airflow. NOTE: Tap 9 is not available for gas hea$ng. Important: If a change is made to either 1st or 2nd stage airflow, both must be saved by pushing the MENU key. Neither selec$on will be saved if this is not done.
Designated 1st Stage Gas Hea$ng Airflow Taps S8X2B080M4PSBA (1-6)
S8X2D120M5PSBA (1-5)
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