INDICE
Pág.
Historia…………………………………………………………………………………...…4 Capítul o 1: Refrigera Capítulo Refrigeración. ción. Conceptos. Calor………………………………………………………… 5 Transmisión ión de calor. Frío: concepto………………………………………………...….6 Capítulo 2: Transmis Capítulo 3: Temperatura: concepto…………………………………………………………….……..7 Capítulo 4: resión atmos!"rica # manom"trica……………………………………………….…….$ Capítulo 5: %e!ri&eración. Componentes mec'nicos……………………………………….……….$ Capítulo 6: Compresor de e(uipo )lindado o *erm"tico +,-/…………………………….………..,, Capítulo 7: Compresor de e(uipo )lindado +-/……………………………………………………., Condensador.. Función en re!ri&eración +,-/…………………………………………..,0 Capítulo 8: Condensador Condensador.. Función en re!ri&eración +-/…………………………………………..,6 Capítulo 9: Condensador Capítulo 1: E1aporador: inundado2 seco……………………..………………………………………,7 E1aporador.. Estado del re!ri&erante………………………………………………...….., Capítulo 11: E1aporador ………………………………………………..…………………, Capítulo 12: %estrictor. Tu)o capilar ………………………………………………..…………………, Capítulo 13: Filtro secador. Función en el sistema de re!ri&eración………………………..……… Capítulo 14: %e!ri&erantes. Eliminar el calor……………………………………………………..……3 Capítulo 15: Componentes el"ctricos. otor el"ctrico…………………………………………….…
4 Dis#untor o re1elador de corriente. Interruptor t"rmico…………………. Capítulo 16: %ela#. Dis#untor …….0 Termostato +,-/……………………………………………....6 Capítulo 17: Control de temperatura. Termostato Termostato +-/……………………………………………....7 Capítulo 18: Control de temperatura. Termostato Capítulo 19: 5u interior. Electricidad. Coneiones # alimentación……………………………….… 8 Capítulo 2: E(uipos # *erramientas. 9om)a de 1acío.
anómetro……………………………….$ Capítulo 21: oldador. ina 1oltiamperim"trica……………………………………………………… $ ;)ocardadores……………………………………………3< Capítulo 22: Tu)ería de co)re: do)lador. ;)ocardadores……………………………………………3< Capítulo 23: Corta tu)os. =so en re!ri&eración dom"stica. Fu&as de r e!ri&erantes: detectores… 3, Capítulo 24: ane>o de tu)ería. Corte de tu)o de co)re………………………………….………… 3 Capítulo 25: Tu)o de co)re. Do)lado. ;)ocardado. %e!ri&eración………………………………….33 Capítulo 26: %e!ri&eración. Forma de a)ocardar……………………………………………………… 34 Capítulo 27: oldadura sua1e para tu)ería de co)re………………………………………………….30 Capítulo 28: %eparación de a1erías. Compresor…………………………………………………….. 36 Capítulo 29: Fallas en el compresor. El re!ri&erador no en!ría. Fu&as……………….…………….. 37 1
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Capítulo 3: istema de re!ri&eración. Humedad. Car&a de &as re!ri&erante……………..
……….38 Capítulo 31: %e!ri&erador. oco !río o demasiado !río……………………………………………. …..3$ Con&elación del tu)o de succión. 5u interior no enciende……….. Capítulo 32: %e!ri&erador. Con&elación ….4<
INDICE
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%e!ri&eración %e!ri&eració n dom"stica. %eparación +-/…………………….…...4, +-/ …………………….…...4, des*idratador.. %eemplao………………………………………………..4, %eemplao ………………………………………………..4, Capítulo 1: Filtro des*idratador repuesto ………………………………………………………4 Capítulo 2: Instalar el !iltro de repuesto………………………………………………………4 sistema ……………………………………………44 Capítulo 3: %e!ri&eración. 5impiea del sistema……………………………………………44 compresora………………………………………..…46 ………………………………………..…46 Capítulo 4: %eemplao de la unidad compresora Capítulo 5: Instalar el compresor nue1o de reemplao …………………………………….48 Capítulo 6: %eparación de un e1aporador da?ado. Cómo utiliar los compuestos ……..4$ de!ectuoso …………………………………………...0, Capítulo 7: %eparar un condensador de!ectuoso…………………………………………...0, *umedad ……………..…………03 Capítulo 8: %eparación de un sistema contaminado de *umedad……………..…………03 de!ectuoso ……………………………………………………..…….04 Capítulo 9: Termostato de!ectuoso……………………………………………………..…….04 de!ectuoso……………………………………………….06 Capítulo 1: %etirar un e1aporador de!ectuoso……………………………………………….06 Capítulo 11: Determinar presiones de un sistema de re!ri&eración …………...……………08 normal ……………………………..…….6< Capítulo 12: Compresor. Determinar el ampera>e normal……………………………..…….6< sistema ………………………………………………6, Capítulo 13: Falta de re!ri&erante en el sistema………………………………………………6, sistema ………………………………………………6 Capítulo 14: Falta de re!ri&erante en el sistema………………………………………………6 o)struido …………………………………………………………….63 Capítulo 15: Tu)o capilar o)struido…………………………………………………………….63 Capítulo 16: o)recar&a de re!ri&erante. rue)a para determinar la !alla …………………60 Capítulo ,7: Determinación de un termostato de!ectuoso de!ectuoso………………………………..….66 ………………………………..….66
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HISTORIA
El re!ri&erador es un in1ento (ue data aproimadamente del si&lo @AIII2 sin em)ar&o2 no !ue sino *asta el a?o ,784 (ue !ue creada la primera m'(uina para en!riar2 su in1entor !ue Billiam Cullen. ste aparato utilia)a un lí(uido re!ri&erante2 el "ter nitroso2 un lí(uido de e1aporación 1ol'til. i )ien esta m'(uina lo&ra) lo&ra)a a en!ri en!riar ar para para retard retardar ar la desco descompo mposic sición ión de los los alime alimento ntoss pereci pereci)l )les2 es2 el primer primer re!ri re!ri&e &erad rador or dom"stico se creó en el a?o ,$7. ;l comieno solo las !amilias mu#2 pero mu# ricas podían costear uno de estos aparatos2 # con el tiempo se con1irtió en una necesidad # en el est'ndar moderno de un *o&ar. El re!ri&erador !unciona a )ase de un sistema o circuito cerrado de procesos2 (ue opera &racias a un &as re!ri&erante. Este circuito2 a &randes ras&os2 consta de dos procesos2 uno de compresión # otro de descompresión del &as2 (ue lo *acen pasar de estado &aseoso a lí(uido # 1ice1ersa. or medio de estos dos procesos2 el re!ri&erador es capa de &enerar !río para su interior # li)erar el calor a tra1"s de la re>illa con (ue cuenta en la parte posterior2 (ue tam)i"n se denomina condensador. ara poder controlar estos procesos2 los re!ri&eradores cuentan con un sistema de termostato para re&ular el !río de su interior2 (ue controla el proceso de compresión del &as re!ri&erante. ara comprender cómo !unciona un re!ri&erador es necesario sa)er (ue2 naturalmente2 el calor !lu#e de un sistema de alta temperatura a uno de menor temperatura. or lo tanto2 lo (ue de)e *acer un re!ri&erador es )astante comple>o2 #a (ue su !unción es realiar el proceso opuesto. ara realiar el proceso de en!riado2 por medio de la ener&ía el"ctrica2 el lí(uido re!ri&erante re!ri&erante retira ener&ía de calor (ue se encuentra dentro del re!ri&erador # del con&elador2 la (ue se encuentra alrededor de los 7 # los ,<C de temperatura. sta sale al eterior por medio de la re>illa entre unos 0 # 3<C. Es posi)le sacar la ener&ía de calor de)ido a (ue el lí(uido re!ri&erante es mu# 1ol'til2 es decir2 puede pasar de estado lí(uido a &aseoso a temperaturas mu# )a>as. De este modo2 el lí(uido re!ri&erante (ue a*ora se encuentra en estado &aseoso se diri&e al compresor. ;llí2 el &as es licuado de)ido a la presión e>ercida # se calienta2 pasando2 nue1amente2 a estado lí(uido. 5ue&o2 el lí(uido re!ri&erante de)e pasar por la llamada 1'l1ula de epansión2 donde una parte se en!ría # la otra se e1apora. De esta manera2 se constitu#e un ciclo2 el lí(uido 1uel1e para tomar ener&ía de calor2
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Capítulo 1: Refrigeración. Conceptos. Calor -MANUAL PRÁCTICO DEL TALLER DE REFRIGERACIÓN DOMÉSTICA
INTRODUCCIÓN Este manual se *a realiado pensando en las personas (ue desean in&resar en el campo de la re!ri&eración2 re!ri&eración2 adem's de constituirse en una *erramienta pr'ctica para los t"cnicos de re!ri&eración re!ri&eración dom"stica. 5os conceptos )'sicos relacionados en el capítulo inicial son indispensa)les para tener una idea clara so)re aspectos !undamentales de re!ri&eración. re!ri&eración. 5os capítulos posteriores tratan la re!ri&eración dom"stica de una manera mu# pr'ctica teniendo en cuenta la necesidad de (ue el lector pueda entender las condiciones # procesos para realiar tra)a>os relacionados relacionados con el !uncionamiento2 mantenimiento # reparación de re!ri&eradores dom"sticos. 5a )ase para la ela)oración ela)oración de este manual2 adem's de la su!iciente documentación # !undamentación *a sido la eperiencia con estudiantes en este campo. !"#$RR%&&% '(#)%R(C% !"& $C%*!(C(%*$+("*)% !"& $(R"
No o)stante (ue la re!ri&eración2 como la conocemos actualmente2 data de unos sesenta a?os2 al&unos de sus principios !ueron conocidos *ace tanto como ,< <<< a?os antes de Cristo. =no de los &randes &randes sistemas para sistemas para suprimir el calor sin duda !ue el de los e&ipcios. Este se utilia)a principalmente en el palacio del !araón. 5as paredes esta)an construidas de enormes )lo(ues de piedra2 con peso superior de ,<<< Toneladas # de un lado pulido # el otro 'spero. Durante la noc*e2 3<<< escla1os desmantela)an las paredes # acarrea)an las piedras al Desierto del '*ara. Como la temperatura el temperatura el en el desierto disminu#e nota)lemente a ni1eles mu# )a>os durante el transcurso de la noc*e2 las piedras se en!ria)an # >ustamente antes de (ue amaneciera los escla1os acarrea)an de re&reso las piedras al sitio donde el palacio # 1ol1ían a colocarlas al sitio donde estas se encontra)an. e supone (ue el !araón dis!ruta)a de temperaturas alrededor de los 6.7C2 mientras (ue a!uera estas se encontra) encontra)an an *asta en los 04C o mas. Como se menciono menciono se necesita)an necesita)an 3<<< escla1os escla1os para poder e!ectuar esta la)or de acondicionamiento2 acondicionamiento2 lo (ue actualmente se e!ectGa !'cilmente. El acondicionador de aire o clima toma clima toma aire del interior de una recamara pasando por tu)os (ue est'n a
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;)anico. Compresor. Termómetro. 5í(uido en!riador. anel o condensador. I - CONCEPTOS BÁSICOS REFRIGERACIÓN 5a re!ri&eración se puede de!inir como el proceso de )a>ar la temperatura a un cuerpo o espacio determinado2 determinado2 (uit'ndole calorías de una !orma controlada2 con el !in2 por e>emplo2 de en!riar alimentos2 alimentos2 conser1ar determinadas sustancias o conse&uir un am)iente a&rada)le. El almacenamiento re!ri&erado de alimentos perecederos2 pieles2 productos pieles2 productos !armac"uticos !armac"uticos # otros se conoce como almacenamiento en !río. 5a re!ri&eración e1ita el crecimiento de )acterias e )acterias e impide al&unas reacciones (uímicas no (uímicas no deseadas (ue pueden tener lu&ar a temperatura am)iente. El uso de *ielo de ori&en natural o arti!icial como re!ri&erante esta)a mu# etendido *asta poco antes de la I uerra undial2 undial 2 cuando aparecieron los re!ri&eradores re!ri&eradores mec'nicos # el"ctricos. 5a e!icacia del e!icacia del *ielo como re!ri&erante es de)ida a (ue tiene una temperatura de !usión de !usión de < C # para !undirse tiene (ue a)sor)er una cantidad de calor e(ui1alente e(ui1alente a 3332, J-&. 5a presencia de una sal en el *ielo reduce en 1arios &rados el punto de !usión del mismo. 5os alimentos (ue se mantienen a esta temperatura o li&eramente por encima de ella pueden conser1arse durante m's tiempo. tiempo. El dióido de car)ono de car)ono sólido2 conocido como *ielo seco o nie1e car)ónica2 tam)i"n se usa como re!ri&erante. El acondicionamiento del aire es aire es el proceso el proceso (ue (ue en!ría2 limpia # circula el aire2 controlando2 controlando2 adem's2 su contenido de *umedad. En condiciones condiciones ideales lo&ra todo esto de manera simult'nea. 5as aplicaciones de la re!ri&eración son mGltiples2 entre las m's importantes tenemos la conser1ación conser1ación de alimentos # el acondicionamiento acondicionamiento de aire. El o)>eti1o )'sico de la re!ri&eración re!ri&eración es trans!erir parte del calor de un cuerpo o un espacio *acia un lu&ar donde ese calor no produca nin&Gn e!ecto ne&ati1o. De esta manera se lo&ra esta)lecer una temperatura deseada en ese cuerpo o espacio. PRINCIPIOS BASICOS DE REFRIGERACION TERMODINAMICA: 5a TERMODINAMICA: 5a Termodin'mica es Termodin'mica es una rama de la ciencia (ue ciencia (ue trata so)re la acción mec'nica del mec'nica del calor. Ha# ciertos principios !undamentales de la naturalea2 naturalea 2 llamados 5e#es Termodin'micas2 5e#es Termodin'micas2 (ue ri&en nuestra eistencia a(uí en la tierra2 tierra2 1arios de los cuales son )'sicos para el estudio de la re!ri&eración. re!ri&eración. 5a primera # la m's importante de estas le#es dice: 5a ener&ía no puede ser creada ni destruida2 sólo puede trans!ormarse de un tipo de ener&ía en otro. CALOR: El CALOR: El calor es una de las !ormas de ener&ía (ue se produce por la 1i)ración de las mol"culas de los cuerposK cuerposK por e>emplo2 e>emplo2 la ener&ía ener&ía mec'nica (ue opera una rueda causa !ricción # crea calor. Calor es !recuentem !recuentemente ente de!inido de!inido como ener&ía en tr'nsito2 tr'nsito2 por(ue nunca nunca se mantien mantiene e est'tica2 est'tica2 #a (ue siempre est' transmiti"ndose de los cuerpos c'lidos a los cuerpos !ríos. 5a ma#or parte del calor en la tierra se deri1a de las radiaciones del sol. 5a unidad de medida del calor es la caloría. =na cuc*ara sumer&ida en a&ua *elada a&ua *elada pierde su calor # se en!ríaK una cuc*ara sumer&ida en ca!" caliente ca!" caliente a)sor)e el calor del ca!" # se calienta. in em)ar&o2 las pala)ras Lm's calienteL # Lm's !ríoL2 son sólo t"rminos comparati1os. Eiste calor a cual(uier temperatura arri)a de cero a)soluto2 incluso en cantidades etremadamente pe(ue?as. Cero a)soluto es el t"rmino usado por los cientí!icos para descri)ir la temperatura m's )a>a (ue teóricamente es posi)le lo&rar2 en la cual no eiste calor2 # (ue es de 73
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5a se&unda le# importante le# importante de la termodin'mica es a(uella se&Gn la cual el calor siempre 1ia>a del cuerpo m's c'lido al cuerpo m's !río. El &rado de transmisión es directamente proporcional proporcional a la di!erencia de temperatura entre am)os cuerpos. El calor puede 1ia>ar en tres di!erentes !ormas: %adiación2 %adiación 2 Conducción # Con1ección. Con1ección. RADIACIÓN: Es la trans!erencia de calor (ue se da sin la necesidad de un cuerpo o a&ente conductor2 el calor se transmite por medio de ondas o ra#os (ue son capaces de atra1esar espacios 1acíos # el alcance de ellos depende de la potencia de la !uente calorí!ica. CONDUCCIÓN: Es la transmisión de calor desde un punto con una determinada temperatura temperatura *asta otro de menor temperatura2 (ue puede ser dentro de un mismo cuerpo o de un cuerpo a otro. 5a 1elocidad de conducción de calor depende del material utiliado como conductor2 los metales son )uenos conductores de calor # uno de los me>ores # m's utiliados es el co)re. Mtros materiales materiales tales como el poliuretano2 la lana de 1idrio2 el corc*o son utiliados como aislantes t"rmicos. El aca)ado # el color de la super!icie de los materiales es de suma importancia para los e!ectos de la radiación2 si la super!icie es lisa # el color es claro o me>or aGn es re!lecti1o2 los ra#os de calor al i&ual (ue los de lu son re!le>ados. i la super!icie tiene ru&osidades # es de color oscuro so)re todo ne&ro2 los ra#os calorí!icos son a)sor)idos. a)sor)idos. CONVECCIÓN: 5a CONVECCIÓN: 5a trans!erencia de calor por con1ección se da por la di!erencia de densidad (ue su!ren los &ases # los lí(uidos. Cuando un &as o un lí(uido se calienta pierde densidad por lo tanto tiende a su)ir # cuando un &as o lí(uido se en!ría o pierde calor su)e su densidad o peso especí!ico # tiende a )a>ar2 esto *ace (ue se !orme un ciclo permanente (ue su)e el &as o lí(uido mientras est" cerca de una !uente de calor # )a>ar cuando se ale>a de ella. En el momento (ue la !uente calorí!ica se suspenda2 se i&ualan sus temperaturas2 sus densidades # desaparece el ciclo mencionado. FRÍO. El !río es simplemente la ausencia de calor parcial o total2 la ausencia de calor produce !río así como la ausencia de lu produce som)ra. or lo tanto el !río no es ener&ía es ausencia de ener&ía calorí!ica. El !río se produce cuando se (uita el calor a un cuerpo o espacio. AISLAMIENTO. Hasta AISLAMIENTO. Hasta el momento no eiste un material aislante de calor per!ecto2 los materiales (ue se utilian para aislar el calor2 lo (ue *acen es reducir la 1elocidad de trans!erencia de calor de tal !orma (ue el sistema de re!ri&eración sa(ue el calor con ma#or rapide rapide de lo (ue le toma a este entrarse nue1amente. =n aislante de calor ideal de)e e1itar la trans!erencia de calor en sus tres !ormas (ue son la conducción2 la radiación # la con1ección. i este material eistiera la re!ri&eración !uera muc*o m's !'cil. ara aislar la conducción del calor se utilian materiales con un !actor de conducti1idad lo m's )a>o posi)le. ara aislar el calor por radiación radiación se de)e utiliar super!icies planas # de colores claros # )rillantes (ue re!le>en las ondas de ener&ía radiante. ientras m's re!le>e el material menos calor a)sor)e. En cuanto al aislamiento contra la con1ección se utilian materiales materiales (ue tienen t ienen atrapadas celdas pe(ue?as de aire e1itando la circulación del mismo )uscando en lo posi)le (ue se produca el menor mo1imiento.
Capítulo 3: )e )e,peratura: ,peratura: concepto
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el sistema in&les se utilia la escala LFa*ren*eitL. LFa*ren*eitL. Estas escalas se )asan en los puntos de !usión del *ielo # de e)ullición del a&ua2 en la escala Centí&rada el punto de !usión del *ielo es el &rado cero # el punto de e)ullición del a&ua es el &rado cien o sea ,<<C. 5as temperaturas t emperaturas por encima del punto de !usión del *ielo son positi1as # las in!eriores a este punto son ne&ati1as. En la escala Fa*ren*eit el punto de !usión del *ielo se marca como 3F # el de e)ullición del a&ua como ,F2 por lo tanto entre estos dos puntos *a# ,8< di1isiones i&uales. El Gnico punto de coincidencia entre las dos escalas es el &rado 4<. ara con1ertir &rados Centí&rados a &rados Fa*ren*eit o 1ice1ersa se parte de las di1isiones (ue eisten entre los puntos de !usión del *ielo # de e)ullición e)ullición del a&ua. a)emos (ue en la escala Fa*ren*eit eisten ,8< # en la escala Centí&rada ,<< por lo tanto se puede deducir (ue cada &rado en la escala Fa*ren*eit e(ui1ale e(ui1ale a ,<<-,8< o sea 0-$ de la escala Centí&rada por lo tanto ,F e(ui1ale a0-$ de ,C # ,C e(ui1ale a $-0 de ,F. ;dem's de esto de)emos tener en cuenta (ue la escala Centí&rada parte de < # la Fa*ren*eit de 3 2 por lo tanto para con1ertir &rados Centí&rados a Fa*ren*eit se multiplican multiplican los &rados Centí&rados por $-0 # a este resultado se le suma 3 e>emplo: Con1ertir 4< C a Fa*ren*eit 4< $-0 3 O 7 3 O ,<4F. ara con1ertir &rados Fa*ren*eit a Centí&rados se resta 3 al nGmero de &rados Fa*ren*eit # este resultado se multiplica por 0-$ E>emplo: Con1ertir 8<F a Centí&rados 8< 3 0-$ O 48 0-$ O 626 C 5as escalas a)solutas son la escala Pel1in # la escala %anine. e les denomina a)solutas por(ue ellas parten del cero a)soluto2 donde se dice (ue *a# ausencia total de calor2 inmo1ilidad molecular # una presión nula. 5a escala Pel1in corresponde al sistema m"trico donde el punto de !usión del *ielo se marca con 73P # el punto de e)ullición del a&ua con 373P # el cero a)soluto es i&ual a73C. ara con1ertir &rados Pel1in a &rados centí&rados2 cuando son temperaturas positi1as simplemente se suma a los &rados Centí&rados 73. +PO C 73/ # para temperaturas ne&ati1as se le resta a 73 los &rados Centí&rados. +P O 73 C/. 5a escala %anine corresponde al sistema in&les donde el punto de !usión del *ielo es de 4$% # el punto de e)ullición del a&ua es de 67%2 el cero a)soluto es i&ual a 46<F. ara con1ertir &rados Fa*ren*eit a %anine cuando es superior a cero &rados Fa*ren*eit se suma 46< a la lectura. +% O F 46
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Figura .
Capítulo 4: /resión at,osf0rica ,ano,0trica PRESIÓN: e PRESIÓN: e puede de!inir como la !uera e>ercida uni!ormemente so)re una super!icie2 por tanto se calcula di1idiendo di1idiendo la !uera total aplicada so)re la super!icie total en la cual actGa. En el sistema m"trico se epresa en Pilo&ramos so)re Centímetro cuadrado cuadrado se a)re1ia P& - cm # en el sistema in&l"s 5i)ras so)re pul&ada cuadrada (ue se ;)re1ia 5) - l&. PRESIÓN ATMOSFÉRICA: Es ATMOSFÉRICA: Es la presión (ue e>erce el aire o la atmós!era so)re la super!icie terrestre. terrestre. El aire es una mecla de di!erentes &ases meclados !ísicamente2 mas no (uímicamente
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En re!ri&eración los manómetros m's utiliados son los de t u)o de L9ourdonL el cual es un tu)o met'lico aplanado2 aplanado2 cur1ado # cerrado por un etremo. El tu)o tiende a enderearse al aumento proporcional proporcional de la presión en su interior2 en tanto (ue con el 1acío tiende a cur1arse m's. Este mo1imiento es transmitido a una a&u>a indicadora so)re una car'tula de)idamente demarcada por li)ras de presión por pul&ada cuadrada +I/ o por Pilo&ramos por centímetro cuadrado.
Capítulo 5: Refrigeración. Co,ponentes ,ecnicos
igura 2.1
II - COMPONENTES MECÁNICOS En En re!ri&eración dom"stica pueden ser empleados e(uipos (ue !uncionen tanto por el sistema de compresión como por el sistema de a)sorción2 los (ue di!ieren !undamentalmente !undamentalmente en sus procesos de !uncionamiento. !uncionamiento. En este manual nos ocuparemos Gnicamente del sistema de compresión. CONCEPCIONES GENERALES SOBRE COMPRESORES. Enciclopedia icroso!t+%/ Encarta+%/ $8. +c/ ,$$3,$$7 icroso!t Corporation. +,,/ El Compresor de aire2 tam)i"n llamado )om)a de aire2 m'(uina (ue disminu#e el 1olumen de una determinada cantidad de aire # aumenta su presión por procedimientos mec'nicos. El aire comprimido posee una &ran ener&ía potencial2 #a (ue si eliminamos la presión eterior2 se epandiría r'pidamente. El control de esta !uera epansi1a proporciona proporciona la !uera motri de muc*as m'(uinas # *erramientas2 como martillos neum'ticos2
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ara e1itar este calentamiento *a# (ue en!riar el aire con a&ua o aire !río antes de lle1arlo al depósito. 5a producción de aire comprimido a alta presión si&ue 1arias etapas de compresiónK en cada cilindro se 1a comprimiendo comprimiendo m's el aire # se en!ría entre etapa # etapa. El compresor tiene dos !unciones en el ciclo de re!ri&eración: en primer lu&ar succiona el 1apor re!ri&erante # reduce la presión en el e1aporador a un punto en el (ue puede ser mantenida la temperatura de e1aporación deseada. En se&undo lu&ar2 el compresor ele1a la presión del 1apor re!ri&erante a un ni1el lo su!icientemente alto2 de modo (ue la temperatura de saturación sea superior a la temperatura del medio en!riante disponi)le para la condensación condensación del 1apor re!ri&erante. 5os compresores centrí!u&os son utiliados ampliamente en &randes sistemas centrales de acondicionamiento acondicionamiento de aire # los compresores &iratorios se utilian en el campo de los re!ri&eradores dom"sticos. in em)ar&o2 la ma#oría de compresores utiliados en tama?os de menor ca)alla>e para las aplicaciones aplicaciones comerciales2 dom"sticas e industriales son reciprocantes. reciprocantes. C&*+r#'&r#' R#)i+r&)a$"#'. El dise?o de este tipo de compresores es similar a un motor de automó1il moderno2 con un pistón accionado por un ci&Re?al (ue realia carreras alternas de succión # compresión en un cilindro pro1isto con 1'l1ulas de succión # descar&a. De)ido a (ue el compresor reciprocante es una )om)a de desplaamiento desplaamiento positi1o2 resulta apropiado para 1olGmenes de desplaamiento reducido2 # es mu# e!ica a presiones de condensación ele1ada # en altas relaciones de compresión. Ventajas:
;dapta)ilidad a di!erentes re!ri&erantes Facilidad con (ue (ue permite el desplaamiento desplaamiento de lí(uido a tra1"s tra1"s de tu)erías dada dada la alta presión presión creada por el compresor. Dura)ilidad encille de su dise?o - Costo relativamente bajo
C&*+r#'&r#' ,# "i+& ai#r"&: 5os primeros modelos de compresores de re!ri&eración !ueron de este tipo. Con los pistones # cilindros sellados en el interior de un C'rter # un ci&Re?al etendi"ndose a tra1"s del cuerpo *acia a!uera para ser accionado por al&una !uera eterna. Tiene un sello en torno del ci&Re?al (ue e1ita la p"rdida de re!ri&erante # aceite del compresor. Desventajas:
a#or peso Costo superior
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compresor2 con todas sus partes2 tanto del motor como del compresor2 *erm"ticamente selladas en el interior de una cu)ierta comGn. e eliminan los trastornos del sello2 los motores pueden calcularse especí!icamente especí!icamente para la car&a (ue *an de accionar2 # el dise?o resultante es compacto2 económico2 e!iciente # )'sicamente no re(uiere mantenimiento. mantenimiento. 5as ca)eas cu)iertas del estator2 placas del !ondo # cu)iertas de Carter son desmonta)les desmonta)les permitiendo el acceso para sencillas reparaciones en el caso de (ue se deteriore el compresor.
Capítulo 6: Co,presor -e euipo lin-a-o o er,0tico 12 M&"&-)&*+r#'&r /#r*0"i)&: Este !ue desarrollado en un es!uero para lo&rar una disminución de tama?o # costo # es ampliamente utiliado en e(uipo unitario de escasa potencia. Como en el caso del motocompresor semi*erm"tico2 semi*erm"tico2 el motor el"ctrico se encuentra montado directamente en el ci&Re?al del compresor2 pero el cuerpo es una carcaa met'lica sellada con soldadura. En este ti tipo de compresores no pueden lle1arse aca)o reparaciones interiores puesto (ue la Gnica manera de a)rirlos es cortar la carcaa del compresor.
igura 2.3
El mo1imiento de rotación del motor se transmite al compresor en !orma directa2 raón por la cual se denomina de L;coplamiento directoL2 pues (uedan eliminados los ór&anos de transmisión2 tales como poleas # correas2 (ue resultan ine1ita)les en los e(uipos de tipo a)ierto. En el e(uipo )lindado se utilia como restrictor un tu)o de co)re de di'metro mu# pe(ue?o al (ue se le da el nom)re de tu)o capilar2 tu)o (ue constitu#e al mismo tiempo la línea lí(uida. El tu)o capilar cumple la !unción de mantener la correcta di!erencia de presiones entre el lado de alta # el lado de )a>a del sistema como se puede o)ser1ar en la Fi&ura . ermitiendo ad(uirir al mismo tiempo el e1aporador2 la cantidad eactamente necesaria de lí(uido re!ri&erante.
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Figura 1.1
Capítulo 7: Co,presor -e euipo lin-a-o 22 e elimina la necesidad de prensaestopas2 pues el e>e no so)resale !uera del )linda>e2 constitu#endo constitu#endo una de las principales 1enta>as de este tipo de e(uipos.
igura 2.4
5a ec"ntrica (ue por medio de la )iela transmite el mo1imiento alternati1o o de 1ai1"n al "m)olo o pistón2 se *alla montada directamente so)re el e>e del motor. eneralmente el e>e se *alla instalado 1erticalmente2 1erticalmente2 raón por la cual el "m)olo se desplaa *oriontalmente *oriontalmente en el interior del cilindro. Como el motor # el compresor se *allan acoplados directamente2 el compresor tra)a>a a la misma 1elocidad del motor o sea a ,.4< %... (ue es una 1elocidad ele1ada2 por lo tanto el di'metro como el recorrido del "m)olo se *acen relati1amente pe(ue?os. 5a unidad compresora se *alla soportada por medio de resortes # toda la carcasa de acero (ue encierra la unidad2 est' cuidadosamente )alanceada2 )alanceada2 para e1itar la 1i)ración al &a)inete. En lo (ue se re!iere a la lu)ricación permanente de todas las partes mó1iles del compresor2 se ase&ura su
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5a creciente demanda de e(uipo de acondicionamiento de aire mas compacto # menor peso *a !orado el desarrollo de motocompresores motocompresores *erm"ticos con motores de dos polos (ue !uncionan a 30<< rpm +$<< rpm en 0< ciclos/. 5as aplicaciones especialiadas especialiadas para acondicionamiento acondicionamiento de aire en a1iones2 automó1iles # e(uipo militar2 utilian compresores de ma#or 1elocidad2 aun(ue para la aplicación comercial normal # dom"stica el suministro de ener&ía el"ctrica eistente de 6< ciclos limita &eneralmente la 1elocidad de los compresores a la actualmente disponi)le de ,70< # 30<< rpm. 5as 1elocidades superiores superiores producen pro)lemas de lu)ricación # duración. S estos !actores2 así como el costo2 tama?o # peso de)en ser considerados en el dise?o # aplicación del compresor. Fu$)i&$a*i#$"& B2'i)& Cuando el pistón se mue1e *acia a)a>o en la carrera de succión se reduce la presión en el cilindro. S cuando la presión del cilindro es menor (ue el de la línea de succión del compresor la di!erencia de presión moti1a la apertura de las 1'l1ulas de succión # !uera al 1apor re!ri&erante a (ue !lu#a al interior del cilindro. Cuando el pistón alcana el !in de su carrera de succión e inicia la su)ida +carrera de compresión/2 se crea una presión en el cilindro !orando el cierre de la 1'l1ulas de succión. 5a presión en el cilindro continua ele1'ndose a medida (ue el cilindro se desplaa *acia arri)a comprimiendo el 1apor atrapado en el cilindro. =na 1e (ue la presión en el cilindro es ma#or a la presión eistente en la línea de descar&a del compresor2 las 1'l1ulas de descar&a se a)ren # el &as comprimido !lu#e *acia la tu)ería de descar&a # al condensador. Cuando el pistón inicia su carrera *acia a)a>o la reducción de la presión permite (ue se cierren la 1'l1ulas de descar&a2 dada la ele1ada presión del condensador # del conducto de descar&a2 # se repite el ciclo. Durante cada re1olución del ci&Re?al se produce una carrera de succión # otra de compresión de cada pistón. De modo (ue en los motocompresores de ,70< rpm tienen lu&ar a ,70< ciclos completos de succión # compresión en cada cilindro durante cada minuto. En los compresores de 30<< rpm se tiene
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CHO metros cG)icos por *ora CO metros cG)icos por minuto Cm3-%e1 O centímetros cG)icos por re1olución D O di'metro del cilindro +cm/ 5 O 5ar&o carrera +cm/ N O nGmero de cilindros % O %e1oluciones por minuto ,<<
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5os compresores en!riados por aire re(uieren un !lu>o adecuado de aire so)re el cuerpo del compresor para para e1itar e1itar su recale recalenta ntamie miento nto.. El !lu>o !lu>o de aire aire proced procedent ente e del del 1entil 1entilad ador or de)e de)e de ser desca descar&a r&ado do directamente so)re el motocompresor. 5os compresores en!riados por a&ua est'n e(uipados con una camisa por la (ue circula el a&ua o est'n en1ueltos con un serpentín de co)re. El a&ua de)e de !luir a tra1"s del circuito de en!riamiento cuando el compresor est' en operación. 5os motocompresores en!riados en!riados por re!ri&erante se dise?an de modo (ue el &as de succión !lu#a en torno # a tra1"s del motor para su en!riamiento. ; temperatura de e1aporación por de)a>o de ,8C o <F es necesario un en!riamiento adicional mediante !lu>o de aire puesto (ue la densidad decreciente del &as re!ri&erante reduce su propiedad de en!riamiento. Ca+a)i,a, ,#! )&*+r#'&r 5os datos de capacidad los !acilita el !a)ricante de cada modelo de compresor para los re!ri&erantes con los (ue puede ser utiliado. Estos datos pueden o!recerse en !orma de cur1as o ta)las2 (ue indica la capacidad en Pcal- *ora2 a di1ersas temperaturas temperaturas de succión # de descar&a. Compresores de dos etapas e *an desarrollado los compresores de dos etapas para aumentar la e!iciencia cuando las temperaturas de e1aporación se encuentran en la &ama de 30C a 6C. Estos compresores se di1iden internamente en )a>a o alta. 5os motores de tres cilindros tienen dos cilindros en la primera etapa # uno en la se&unda2 mientras (ue los modelos de seis cilindros tienen cuatro en la primera # dos en la se&unda.
Capítulo 8: Con-ensa-or. unción en refrigeración 12
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Figura 1.5 El a&ente re!ri&erante en estado &aseoso # a temperaturas superiores a la del am)iente2 lle&a al condensador condensador desde la descar&a del compresor. ;l producirse el contacto del &as re!ri&erante con las paredes del condensador (ue se *alla a una temperatura mu# in!erior a la del &as2 comiena este a perder calor (ue pasa al am)iente pro1oc'ndose la condensación del &as. En realidad el !enómeno o proceso de condensación no se realia en !orma uni!orme a todo lo lar&o del condensador condensador ni !inalia eactamente eactamente a la salida de este.
Capítulo 9: Con-ensa-or. unción en refrigeración 22 Durante el proceso2 tal como se 1er' en la Fi&ura .6 eiste 1apor caliente a alta presión en una parte del condensador # lí(uido caliente a alta presión en la otra.
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cual al ele1arse el aire calentado por la etracción del calor del condensador ser' sustituido por aire m's !río2 proceso (ue se&uir' produci"ndose en !orma in interrumpida durante todo el tiempo en (ue en el condensador condensador *a#a una temperatura superior superior a la del am)iente.
Capítulo 1: ";apora-or: inun-a-o< seco EVAPORADOR : e conoce conoce por e1aporador al intercam)iador intercam)iador de calor (ue (ue &enera la trans!erencia de ener&ía t"rmica contenida en el medio am)iente *acia un &as re!ri&erante a re!ri&erante a )a>a temperatura # temperatura # en proceso de e1aporación. e1aporación . Este medio puede ser aire o a&ua. Estos intercam)iadores de calor se encuentran al interior de ne1eras2 re!ri&eradores re!ri&eradores dom"sticos2 c'maras de re!ri&eración re!ri&eración industrial2 1itrinas comerciales para alimentos # un sin!ín de aplicaciones en procesos para la industria de alimentos2 así como en procesos (uímicos. (uímicos . De i&ual manera2 tam)i"n se encuentran al interior una di1ersa &ama de e(uipos de aire acondicionado. acondicionado . Fi&ura .7
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ocupado por re!ri&erante en estado &aseoso2 #a sea en estado de 1apor *Gmedo o de 1apor saturado2 sin (ue *a#a en su interior !luido re!ri&erante en estado lí(uido. ara lo&rar esto se emplea una 1'l1ula de epansión instalada en la entrada de lí(uido al e1aporador2 lo (ue al pro1ocar la epansión produce una r'pida e1aporación del re!ri&erante (ue penetra en el e1aporador en estado &aseoso2 despu"s de lo cual completa su 1aporiación 1aporiación total en el interior de los tu)os (ue componen el e1aporado.
Ti+&' ,# #%a+&ra,&r Es!ema "e eva#ora"or "e e$#ansi%n "ire&ta
Es(uema de e1aporador inundado
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";apora-or -e tuo -escuierto -e core para enfria,iento -e agua #eg=n tipo -e construcción:
- Tu& ,#')ui#r"& 5os e1aporadores de tu)o descu)ierto se constru#en por lo &eneral en tu)erías de tu)erías de co)re o co)re o )ien en tu)ería de acero. El tu)o de acero se utilia en &randes e1aporadores # cuando el re!ri&erante a utiliar sea
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de aire acondicion acondicionado. ado. 5as aletas aletas sir1en sir1en como super!icie super!icie secundaria secundaria a)sor)ed a)sor)edora ora de calor # tiene por e!ecto aumentar el 'rea super!icial 'rea super!icial eterna del intercam)iador intercam)iador de calor2 me>or'ndose me>or'ndose por tanto la e!iciencia para en!riar aire u otros &ases. El tama?o # espaciamiento de las aletas depende del tipo de aplicación para el cual est' dise?ado el serpentín. Tu)os pe(ue?os re(uieren aletas pe(ue?as # 1ice1ersa. El espaciamiento de la aletas 1aría entre entre , *asta *asta ,4 aletas aletas por pul&ada2 pul&ada 2 dependiendo principalmente de la temperatura de operación del serpentín. ; menor temperatura2 ma#or espaciamiento entre aletasK esta distancia entre las aletas es de elemental rele1ancia rele1ancia !rente la !ormación de escarc*a de)ido a (ue esta puede o)struir parcial o totalmente la circulación de aire # disminuir el rendimiento del e1aporador.
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En la Fi&ura .8 e muestran los distintos estados en (ue el re!ri&erante puede encontrarse en el interior del e1aporador.
Figura 1.= Tal como se *a estudiado anteriormente2 el lí(uido (ue se *alla en el interior del condensador2 est' sometido a la presión de compresión2 compresión2 siendo necesario mantener esta presión para el !uncionamiento !uncionamiento del sistema. En consecuencia entre la línea de lí(uida # la entrada del e1aporador se *ace necesario intercalar un dispositi1o mediante el cual sea posi)le re&ular la entrada del lí(uido2 separando los lados de alta # de )a>a presión eactamente a la entrada del e1aporador. ara lo&rar esto se recurre a un sistema o dispositi1o (ue re&ula simult'neamente simult'neamente la cantidad de
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restrictor pro1ocando la !alla del sistema. El restrictor une a su simplicidad de construcción # )a>o costo2 la 1enta>a de no poseer dispositi1os mó1iles2 lo (ue simpli!ica su !uncionamiento # elimina posi)ilidades de !allas. ; las 1enta>as antes mencionadas mencionadas de)e a&re&arse otra no menos importante de)ido al *ec*o de (ue el restrictor permite i&ualar las presiones entre el lado de alta # el de )a>a del sistema cuando el compresor se detiene2 lo (ue se realia es lo si&uiente: ;l ;l detenerse un e(uipo de re!ri&eración2 comiena a circular a tra1"s del restrictor una cierta cantidad adicional de lí(uido re!ri&erante *asta lo&rar el e(uili)rio de presiones entre el lado de alta # el lado de )a>a. Esto constitu#e una 1enta>a. or cuanto al reducir la presión (ue eiste en el lado de alta2 el compresor arrancara con una car&a muc*o menor2 lo (ue representa un menor consumo de ener&ía por parte del motor (ue acciona al compresor. Este proceso no ocurre cuando la presión eistente en el lado de alta presión del sistema se mantiene en sus 1alores de r"&imen durante los periodos de inacti1idad del e(uipo.
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restricción o caída de presión del re!ri&erante.
Figura 1.>
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reemplaar el compresor2 el !iltro secador # el capilar por elementos compati)les con el ,34 ;. ;dem's antes de car&ar el ,34 ; es necesario eliminar el aceite mineral residual presente en el circuito !ri&orí!ico.
Capítulo 15: Co,ponentes el0ctricos. +otor el0ctrico III - COMPONENTES ELÉCTRICOS En la si&uiente ilustración se pueden o)ser1ar todos los componentes el"ctricos # su coneión. coneión. osteriormente se ir' analiando uno a uno de acuerdo a su !unción en el sistema.
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Figura ?.1
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Figura ?.
Capítulo 17:Control 17:Control -e te,peratura. te,peratu ra. )er,ostato )er,ostato 12
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re&ulación (ue son de LparadaL o desconectado2 1arias posiciones (ue permiten el a>uste desde !río mínimo *asta la m'ima Lcon&elarL # tam)i"n la posición correspondiente correspondiente a Ldescon&elarL. Ldescon&elarL.
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Capítulo 19: &u? interior. "lectrici-a-. Cone@iones ali,entación
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Capítulo 2: "uipos erra,ientas. Ao,a -e ;acío. +anó,etro IV - EUIPOS @ ERRAMIENTAS
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Capítulo 14:
alta -e refrigerante en el siste,a alta -e refrigerante en el siste,a #ínto,as
El &a)inete re!ri&eradoK mu# caliente. ";apora-or: No escarc*a toda la super!icie2 o carece de ella. Co,presorD !unciona por lar&os periodos de tiempo2 en ciertos casos !unciona continuamente. Con-ensa-or: 5as tu)erías del serpentín li&eramente ti)ias. )uería -e -escarga: li&eramente caliente. "l a,peraBe: Durante el !uncionamiento del compresor es menor. /ruea para -eter,inar la falla
Instale # conecte el analiador de presiones o manómetro. Con el compresor !uncionando2 !uncionando2 el analiador de presiones mostrar: Y 9a>a presión de succión o de)a>o de < I. Y resión de descar&a menos de lo normal. Y Cuando el compresor es desconectado las presiones tienden a i&ualarse r'pidamente. Y El ampera>e durante el !uncionamiento del compresor es menor. $cción )o,e las acciones -el caso para proce-er a reparar
Car&ue re!ri&erante al sistema para crear determinada presión +< 3< I/. %ealice las prue)as con1enientes para localiar !u&as. i no *a# !u&as car&ue re!ri&erante al sistema para una operación normal. i *a# !u&as rep'relas con1enientemente. Cam)ien el !iltro secador. Ha&a 1acío al sistema. Car&ueK prue)e !u&as en todas las uniones # puntos de soldadura e!ectuadas. Cuando est" se&uro (ue la unidad est' en!riando correctamente correctamente # el termostato o control de temperatura conecta # desconecta apropiadamente puede concluir la reparación. "l co,presor no co,pri,e
En ocasiones ocurre (ue el compresor de un sistema de re!ri&eración comprime d")ilmente o de>a de comprimir por de!ecto de 1'l1ulas2 #a sea por la !ormación de car)ón rotura de 1'l1ulas o incon1enientes mec'nicos. En estos casos el motor el"ctrico (ue acciona al compresor de la unidad sellada !unciona2 pero la unidad
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re!ri&erante normal.
'u,e-a- en el siste,a
1'l1ulas de ser1icioK instale los manómetros. Cerciórese (ue la o)strucción no es por *umedad. i la o)strucción es total tendr' (ue reemplaar el tu)o capilar por otro del mismo di'metro # lon&itud. Capítulo 15:
)uo capilar ostrui-o )uo capilar ostrui-o
Esta !alla se presenta en casos (ue la unidad ten&a presencia de suciedad internamente. internamente. eneralmente ocurre en unidades (ue *an sido reparadas de!icientemente. #ínto,as
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Con-ensa-or: 5a temperatura en el primer tramo de tu)ería se siente li&eramente ti)ia. )uería -e -escarga: 5i&eramente caliente. "l a,peraBe: Durante el !uncionamiento del compresor es ma#or. /ruea para -eter,inar la falla
Con el compresor !uncionando el analiador de presiones mostrar'K resión de succión menor de la normal o de)a>o de < I. resión de descar&a menor de lo normal. Cuando se desconecta el compresor las presiones se i&ualan lentamente2 o no2 de)ido a una o)strucción total. $cción: realice las operaciones (ue usted conoce en la !orma m's con1eniente.
Descar&ue re!ri&erante del sistema. Cam)ie el tu)o capilar # !iltro des*idratador. Ha&a 1acío # car&ue re!ri&erante al sistema. rue)e !u&asK de *a)er2 corrí>alas. Terminado el proceso de tra)a>o # compro)ado (ue la unidad opera adecuadamente2 si&a las acciones para !inaliar # de>ar la unidad en condiciones de ser1ir e!icamente.
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Capítulo 16:
#orecarga -e refrigerante. /ruea para -eter,inar la falla #orecarga -e refrigerante
Este incon1eniente se mani!iesta en las unidades (ue al ser reparadas se *an ecedido en la car&a re(uerida de re!ri&erante. Cada operación operación de car&a de)e ser considerada para e1itar estos pro)lemas (ue pueden causar da?os a la unidad compresora del sistema !ri&orí!ico. #ínto,as Eainete refrigera-o: Demasiado !río. ";apora-or: Ecesi1a !ormación de escarc*a. Co,presor: uper!icie próima a la coneión de la tu)ería t u)ería de succión se escarc*a &eneralmente al
arrancar.
Con-ensa-or: Calienta demasiado toda la super!icie. )uería -e succión: e !orma condensación en su super!icieK en al&unos casos se !orma escarc*a en la
línea *asta el compresor.
Durante el !uncionamiento el ampera>e del compresor ser' ma#or (ue el normal. /ruea para -eter,inar la falla
Cuando la unidad est' !uncionando !uncionando el analiador analiador mostrar' altas presiones en los manómetros. $cción
%etire la man&uera !lei)le de la coneión central del analiador de presiones (ue le sir1e de protección. ;)ra li&eramente la 1'l1ula del manómetro de )a>a +aul/ del analiador. ermita (ue el re!ri&erante sal&a por el etremo de la man&uera de ser1icio +amarilla/ lentamente. Con el sistema en !uncionamiento2 repita la operación inter1alos de tiempo *asta (ue la presión de )a>a sea in!erior a ,0 I. Despu"s de ,< minutos re1ise las presiones # ase&Grese (ue las mismas no ecedan de ,0 I en )a>a # ,8< I en alta. Determine usted la presión m's con1eniente con1eniente para el tra)a>o adecuado del sistema +de <.0 a ,3 I/.
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#orecarga -e refrigerante
;)re lentamente lentamente la 1'l1ula )a>a )a>a del manómetro manómetro para de>ar salir salir re!ri&erante re!ri&erante del sistema.
i la presión del manómetro de )a>a +aul/ indica mas de ,0 I2 de>e salir el re!ri&erante lentamente. 5as presiones recomendadas para una re!ri&eradora son de 0 a ,3 I. 5a temperatura am)iente in!lu#e en las presiones de condensaci condensación ón del re!ri&erante. 9us(ue untes la presión del tra)a>o adecuado del sistema2 para permitir un escarc*ado uni!orme en el e1aporador. Capítulo 17:
!eter,inación -e un ter,ostato -efectuoso !eter,inación -e un ter,ostato -efectuoso
El termostato o control de temperatura de)e ser reemplaado cuando se *a compro)ado su inoperati1idad. #ínto,as
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/ruea para -eter,inar las fallas
Cuando se *a o)ser1ado el mal !uncionamiento !uncionamiento del sistema o acusa de!ecto similar a los mencionados2 mencionados2 es necesario 1eri!icar el estado del termostato. $cción
Desconecte la unidad de la !uente de alimentación el"ctrica. M)ser1e la u)icación del termostatoK los !a)ricantes optan por 1ariadas !ormas de instalarlo. %etire la perilla de control. i est' !i>ado con tornillos2 a!lo>e # retírelos. En al&unos casos 1iene a>ustado con unos &anc*os presores. En cual(uiera de los casos *a# (ue retirar el cuerpo del termostato con cuidado para no da?ar el tu)o capilar. Cuando ten&a el cuerpo del termostato li)re2 desconecte los terminales de coneión el"ctrica. i la unidad no !unciona)a por(ue los contactos del termostato (uedaron a)iertos2 una los dos terminales el"ctricos # la re!ri&eradora de)e !uncionar. i la unidad (uedo !uncionando !uncionando permanentemente2 al desconectar los terminales #a no !uncionar'. e recomienda realiar la unión # desconeión desconeión de los terminales en prue)a para 1eri!icar el !uncionamiento # parada del compresor. Ten&a precaución al manipular los contactos.
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