Service manual

17
Service Information
NOTE
Processvalvesarenottobeleftonthetubingin
anyapplication,exceptthevalveonEMAService
drierpart#5303918288.
5.  Closehandshut-offvalvetovacuumpump.
Watchcompoundgaugeforseveralminutes.
Ifreadingrises,thereisaleakinthesystem,
gotostep6.Ifnoleakisindicated,stop
vacuumpump.Systemisnowreadyfor
charging.
6.  Ifaleakisindicated,stopvacuumpumpand
introduceasmallchargeofrefrigerantinto
systembycrackingvalveonbottomof
chargingcylinderuntilsystemispressurized
to40or50lbspsig.
7.  Leaktestlow-side.Closecompoundgauge.
Runcompressorforafewminutesandleak
testhigh-side.Whenleakisfound,recapture
refrigerantusingEPAapprovedrecovery
systemRepairandgobacktostep1.
CAUTION
Check the serial plate for the correct
refrigerant type. It is extremely important to
verify the type of refrigerant in the system
before starting any sealed system repairs.
After charging the system with liquid be
certain to wait at least 5 minutes before
starting the compressor to give the refrigerant
a chance to disperse throughout the system.
Otherwise the compressor could be damaged
by attempting to pump excessive quantities
of liquid.
Preparing The Charging Cylinder:
1.  Makecertainthathandshut-offvalveto
vacuumpumpisclosed.
2.  Closehigh-sidemanifoldgaugevalve.
3.  Setchargingcylinderscaletopressure
indicatedoncylinderpressuregauge.
4.  Observerefrigerantlevelinsightglass.
Subtractamounttobechargedintosystem
andnoteshutoffpoint.
5.  Openchargingcylindervalveslowlyand
allowproperchargetoentersystem.
6.  Assoonasrefrigerantinsightglasshas
gonedowntopredeterminedlevel,close
chargingcylindervalve.
7.  Allowsystemtositforveminutes.
8.  Turnonrefrigeratorcompressor.Run
compressorforafewminutesandmonitor
systempressures.
9.  Whensatisedthattheunitisoperating
correctly,clampthehigh-sideprocesstube
withthepinch-offtoolwhiletheunitisstill
running.
10. Slowlyopenthehigh-sidemanifoldgauge
valvetoallowthecompressortoremoveany
refrigeranttrappedinthehigh-sidehoseand
theprocesstting.
11. Closebothofthemanifoldgaugevalves.If
thehigh-sidegaugereadingrises,thepinch-
offmustbecorrectedbeforeproceeding.
12. Removethehigh-sideprocesstubeadaptor
andsoldertheprocesstubeclosed.
13. Clampthelow-sideprocesstubewiththe
pinch-offtoolwhiletheunitisrunning.
Removethelow-sideprocesstubeadaptor
andsoldertheprocesstubeclosed.
14. Checktheprocesstubesforrefrigerantleaks.
WARNING
Disconnect the charging cylinder heater at
this time to prevent the cylinder pressure from
exceeding its maximum limits.
Final Leak Test
1.  WiththerefrigeratorturnedOFFleaktestall
low-sidesystemcomponents.
2.  TurntheunitONandrununtilthecondenser
iswarm.Leaktestthehigh-sidesystem
components.
Charging The System