Toshiba RAS-10J2AVG-EE - Evacuating

Evacuating
Afterthepipinghasbeenconnectedtotheindoorunit,youcanperformthe
airpurgetogetheratonce.
AIR PURGE
Evacuatetheairintheconnectingpipesandintheindoorunitusinga
vacuumpump.Donotusetherefrigerantintheoutdoorunit.Fordetails,
seethemanualofthevacuumpump.
Using a vacuum pump
Besuretouseavacuumpumpwithcounter-flowpreventionfunctionsothat
insideoilofthepumpdoesnotflowbackwardintopipesoftheairconditioner
whenthepumpstops.
(Ifoilinsideofthevacuumpumpenterstheairconditioner,whichuseR32,
refrigerationcycletroublemayresult.)
1.Connectthechargehosefromthemanifoldvalvetotheserviceportofthe
packedvalveatgasside.
2.Connectthechargehosetotheportofthevacuumpump.
3.Openfullythelowpressuresidehandleofthegaugemanifoldvalve.
4.Operatethevacuumpumptostartevacuating.Performevacuatingfor
about15minutesifthepipinglengthis20meters.(15minutesfor20meters)
(assumingapumpcapacityof27litersperminute)Thenconfirmthatthe
compoundpressuregaugereadingis–101kPa(–76cmHg).
5.Closethelowpressuresidevalvehandleofthegaugemanifoldvalve.
6.Openfullythevalvestemofthepackedvalves(bothgasandliquidsides).
7.Removethecharginghosefromtheserviceport.
8.Securelytightenthecapsonthepackedvalves.
Compound pressure gauge Pressure gauge
–101 kPa
(–76 cmHg)
Handle Lo
Charge hose
Connecting pipe
Manifold valve
Handle Hi
(Keep full closed)
Charge hose
Vacuum pump adapter for
counter-flow prevention
Packed valve at gas side
Service port (Valve core (Setting pin))
Packed valve at liquid side
Vacuum
pump
CAUTION
• KEEP IMPORTANT 6 POINTS FOR PIPING WORK.
(1)Takeawaydustandmoisture(insideoftheconnectingpipes).
(2)Tightentheconnections(betweenpipesandunit).
(3)EvacuatetheairintheconnectingpipesusingaVACUUMPUMP.
(4)Checkgasleak(connectedpoints).
(5)Besuretofullyopenthepackedvalvesbeforeoperation.
(6)Reusablemechanicalconnectorsandflaredjointsarenotallowed
indoors.Whenmechanicalconnectorsarereusedindoors,sealing
partsshallberenewed.Whenflaredjointsarereusedindoors,the
flarepartshallberefabricated.
Packed valve handling precautions
•Openthevalvestemallthewayout,butdonottrytoopenitbeyondthe
stopper.
Pipe size of Packed Valve Size of Hexagon wrench
12.70mmandsmallers A=4mm
15.88mm A=5mm
•Securelytightenthevalvecapwithtorqueinthefollowingtable:
Cap Cap Size (H) Torque
ValveRodCap
H17–H19
14~18N·m
(1.4to1.8kgf·m)
H22–H30
33~42N·m
(3.3to4.2kgf·m)
ServicePortCap
H14
8~12N·m
(0.8to1.2kgf·m)
H17
14~18N·m
(1.4to1.8kgf·m)
Hexagon wrench
is required.
Service Port Cap
Valve Rod Cap
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