Hvac: Epa 608 Certification Study Guide

HVAC: EPA 608 CERTIFICATION STUDY
GUIDE



Areopthereopdrop-inopreplacementsopforopR-12opsystems?opWhyoporopwhyopnot?op-opans--
Noopbecauseoptheopnewoprefrigerantsopareopincompatibleopwithoptheopoilsopandoplubricantsop
usedopinopR-12opsystems.

WhatoptypeopofopoilopisopusedopinopR-134aopandopwhatopoilsopwillopitopmixopwith?op-opans--
Esteropbasedopoilsopandoptheyopdoopnotopmixopwithopotheropoils

WhatoptypeopofoplubricantopisopusedopwithopHCFCs?op-opans--Alkylbenzeneoplubricant

Whatopisopdifferenceopb/wopternaryopblendopaopazeotropicopblend?op-opans--
Ternaryopblendsopareopthree-
partopmixturesopwhereasopazeotropicopblendsopareopblendsopofoptwooporopmoreopcompound
sopthatopactoplikeopaopsingleopcompound.

Whatopisoptheoptraitopofopaophygroscopicoplubricant?op-opans--
Itopabsorbsop(takesopon)opmoisture

Whatopisoptemperatureopglideopandopwhatoptypeopofopblendopwon'tophaveopit?op-opans--
Temp.opblendopisoptheopdifferenceopbetweenoptheopdewoppointopandoptheopbubbleoppoint

DewopPointop-opans--
Occursopwhenopsaturationoptempopinopevaporatoropcausesoprefrigerantoptoopchangeopfromopl
iquidoptoopvapor

BubbleopPointop-opans--
Occursopwhenopsaturationoptempopinopcondenseropchangesoprefrigerantopfromopvaporoptoopli
quid

Willoptheopgasesopinopaopternaryopblendopleakopatoptheopsameoprate?opWhyoporopwhyopnot?op-
opans--
Noopbecauseopdifferentoprefrigerantsopinopblendophaveopdifferentopvaporoppressures,opcausi
ngopthemoptoopleakopatopunevenoprates

RefrigerationopProcessop-opans--transferopofopheatopfromoponeopplaceoptoopanother

, Evaporatorop-opans--
Absorbsopheatopintoopsystemopfromopspaceoptoopbeopcooled.opAbsorptionopofopheatopcauses
oprefrigerantoptoopboil.opUponopleaving,oprefrigerantopchangedoptooplowoppressure,oplowoptem
peratureopvapor

Compressorop-opans--
Takesoplowoppressure,oplowoptempopvaporopandopchangesopitoptoopaophigh-temp,ophigh-
pressure,opsuperheatedopvaporopandopdeliversopitoptooptheopcondenser

Condenserop-opans--Rejectsopheatopfromopsystemopandopchangesoprefrigerantopfromophigh-
temp,ophigh-pressureopvaporopintoophigh-pressure,ophigh-tempopliquid

MeteringopDeviceop-opans--reducesoppressureopofoprefrigerantopandopchangesoptheophigh-
pressure,ophigh-tempopliquidopintooplowoppressure,oplowoptempopliquid.

CompoundopGaugeop-opans--
Typicallyopblueopandopmeasuresoplowoppressureop(psig)opandopvacuumop(inHg).

HighopPressureopGaugeop-opans--
Redopandopmeasuresophighopsideop(discharge)oppressure.op0optoop500oppsi

Whatopdoesopaopcompressoropcompress?op-opans--Vapor

Whyopwilloprefrigerantopmigrateoptooptheopcrankcaseopinopaopcompressor?op-opans--
Becauseopofoptheopvaporoppressureopdifferenceopbetweenoprefrigerantopandopoil

Whatopcoloropisoptheophighoppressureopgauge?op-opans--Red

Whatopcoloropisoptheoplowoppressureopgauge?op-opans--Blue

Whatopneedsoptoophappenopifopoilophasopbeenopcontaminatedopbyopburnout?op-opans--
Tripleopevacuateopsystem,opinstalloppermanentopfilter-
drier,opconductopdeepopvacuumopbeforeoprecharging

WhatopareopthreeopRsopofoprefrigeration?op-opans--Recover,oprecycle,opreclaim

Recoverop-opans--
toopremoveopanyoprefrigerantopinopanyopconditionopfromopsystemopandopstoreopinopexternalop
containeropwithoutopnecessarilyoptestingoporopprocessingopinopanyopway

Recycleop-opans--
Toopcleanoprefrigerantopforopimmediateopreuseopbyopseparatingopoilopfromoprefrigerantopando
premovingopmoistureopandopacidityopfromoprefrigerantopbyopuseopofopproductsoplikeopfilteropdri
ers