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7/26/2019 Air c 26 Final Project
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Project
Evaluation of Forced Air Fuel Gas Furnace
AIRC 26: Gas Heating Fundamentals
Instructor: Darrow SoaresStudent: Juan G. Ruiz
Sring 2!"6
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I. Furnace Specifications
Brand Trane XR90
at I! ondensin" Furnace
#i"$ Efficienc% 90&
9'.( AF)E *odel+ T)X0,09-,-
Serial+ /0,-#,1G
*anufactured+ '2'00/
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I. Furnace Specifications
apacit%23a4e Plate Specs Gas input ,05000 BT)2#R
Gas 6utput ,,,,,.1 BT)2#R
73ot on plate5 90& efficienc%8
Per4issile "as suppl% pressure (-.: in ;.. 4a< Per4issile "as suppl% pressure /.0 in ;.. 4in
*anifold pressure -./ in ;..
E
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II. Furnace ocation5 learances and Space
onfine4entsocation+ First floor closet
!ertical installation
*ini4u4 learance to o4ustile *aterials )pflo>
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II. Space onfine4ents
Confined Space Definition:
onfined spaces are defined as anarea >it$ less t$an /0 cuic feet per
(5000 BT)# input ratin" for natural
"as appliances. For t$is particular furnace t$e
calculation is "as input ,05000BT)2#R+
*at$ to verif% confined space+
? -000
loset volu4e+
#ei"$t X ;idt$ X ept$:/ in X ': in X -- ? 1 ft X ' ft X - ft
@'
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III. o4ustion Air Reuire4ents and Suppl%
T$is directCvent furnace does not
need a co4ustion air openin" to t$e
roo4 ecause it dra>s its co4ustion
air in t$rou"$ a P! pipe. Its
co4ustion process is sealed. T$is
furnace pipes air in and ventco4ustion products out. T$e
concentric vent allo>s ot$ vent pipe
and co4ustionCair pipe to pass
t$rou"$ a sin"le openin" in t$e roof or
side >all.
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III. o4ustion Air Reuire4ents and Suppl%
o4ustion Air and !ent Pipe
Ter4ination for t$is irect !ent 7'C
pipe8 furnace s%ste4. As 4entioned
efore t$is furnace use a concentric
vent. T$is allo>s ot$ vent pipes and
co4ustion air to ter4inate t$rou"$ asin"le eall.
T$ese concentric vents are 1 and /
inc$es apart fro4 eac$ ot$er. T$e% donot co4pl% >it$ t$e reuire4ent of
ein" at least -, inc$es apart fro4
eac$ ot$er. #o>ever 5 t$e% 4aintain
4ore t$an (' inc$es 4in. clearance
aove t$e $i"$est anticipated sno>
level.
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III. o4ustion Air Reuire4ents and Suppl%
T$ese pictures displa% 4easure4ents
taDen in t$e attic >it$ a te4perature
of (00 = F.
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I!. Air istriution
ocation+
Spiral suppl% air duct
uct >orD >it$ insulation
T$ere >ere not si"ns ofleaDa"e
uct >orD is sealed t$rou"$
t$e >all
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!. !entin" *et$od
T$is cate"or% I! furnace is a directC
vent furnace.
T$e air for co4ustion is derived
directl% fro4 t$e outside at4osp$ere
and all flue "ases are disc$ar"ed to
t$e outside at4osp$ere
Com$ustionair
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!I. Fuel Suppl%
T$e fuel suppl% for t$is furnace is
natural "as >$ic$ is a 4i
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!II. I"nition S%ste4 and Pilot Provin" evice
#ot surface "as fuel i"niter
T$e $ot surface "as fuel i"niter
"lo>s red efore t$e "as valve
opens
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!III. Electrical Seuence of 6peration >it$ E4p$asis on
Safet% ontrols
Seuence of operation
(. all for $eat
'. Induced raft
-. raft S>itc$ loses
@. I"nition
/. Gas !alve
,. Burners
1. Indoor Blo>er
E4p$asis on Safet% ontrols+
(.raft inducer is ener"ied. It runs
for -0C@/ sec. to prefor4 a
preCpur"e to vent an% accu4ulated
"as or co4ustion products
'.T$e draft s>itc$ looDs to see if t$ere
is a draft. After t$e draft s>itc$ closes5 t$e
$ot surface i"niter is ener"ied
for -0C,0 sec. to allo> it to $eat it up.
-. T$e "as valve is t$en ener"ied and t$e
fla4e sensor looDs to see if fla4e $as een
estalis$ed.
@. T%picall% i"nition trials last -C/ sec. If
fla4es are not sensed5 t$e "as valve is s$ut
off5 t$e draft lo>er continues and anot$er
i"nition trial occurs. *ost #IS controls locD
out
after -C/ unsuccessful atte4pts.
/. If fla4e is estalis$ed5 t$e "as valve re4ains
ener"ied and t$e lo>er is ener"ied after a
ti4e dela%.
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IX. Su44ar% of S%ste4 Efficienc%5 Safet% and
Installation
S%ste4 Efficienc%
90 percent efficienc% furnace
Since t$e flue "as is relativel% cool5
P! can e used as a vent
4aterial
T$is furnaces differ fro4 t$e :0&AF)E 4idCefficienc% furnaces in
t$at an es ot$
vent pipe and co4ustionCair pipe
to pass t$rou"$ a sin"le openin"in t$e roof or side >all.
T$is $ot surface s%ste4 does not
$ave a pilot li"$t5 it li"$ts t$e 4ain
urners.
#ot surface i"nition s%ste4s use
i"niters t$at $eat up instead of asparD.
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IX. Su44ar% of S%ste4 Efficienc%5 Safet% and
Installation
Installation and Safet%
Furnace installation 4eets code.
It co4plies >it$ 4ini4u4
clearances to co4ustion
4aterials upflo>
It $as provisions for pipin"co4ustion air to t$e furnace fro4
t$e outside5 t$is Deeps t$e furnace
fro4 dra>in" air out of t$e
apart4ent
Pipin" in outside co4ustion airalso Deeps $ouse$old c$e4icals
t$at are in t$e air inside t$e
apart4ent out of t$e furnace.
T$e furnace utilies a condensate
pu4p t$at taDes care of t$e
condensed >ater.
If t$e fla4es re not sensed5 t$e
"as valve is s$ut off. T$e furnace flas$es at different
intervals to indicate if so4et$in" is
>ron" >it$ t$e seuence of
operation.
T$e front panel still $ave t$e
electrical data reuired totroules$oot t$e s%ste4 in case of
failure.
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%lectrical Data