Air c 26 Final Project

7/26/2019 Air c 26 Final Project

1/16

Project

Evaluation of Forced Air Fuel Gas Furnace

AIRC 26: Gas Heating Fundamentals

Instructor: Darrow SoaresStudent: Juan G. Ruiz

Sring 2!"6


2/16

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/


3/16

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


4/16

II. Furnace ocation5 learances and Space

onfine4entsocation+ First floor closet

!ertical installation

*ini4u4 learance to o4ustile *aterials )pflo>


5/16

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

@'


6/16

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.


7/16


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.


8/16


T$ese pictures displa% 4easure4ents

taDen in t$e attic >it$ a te4perature

of (00 = F.


9/16

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


10/16

!. !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


11/16

!I. Fuel Suppl%

T$e fuel suppl% for t$is furnace is

natural "as >$ic$ is a 4i


12/16

!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


13/16

!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%.


14/16

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.


15/16

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.


16/16

%lectrical Data

Documents

Air c 26 Final Project