Mitsubishi Electronics MXZ-3B24NA Air Conditioner User Manual


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3-2.PIPECONNECTION
1)Applyathincoatofrefrigerationoil(G)tothearedendsofthepipesand
the pipe connections of the outdoor unit.
2)Alignthecenterofthepipewiththatofthepipeconnectionsoftheoutdoor
unit,thenhandtightenthearenut3to4turns.
3)Tightenthearenutwithatorquewrenchasspeciedinthetable.
•Over-tighteningmaycausedamagetothearenut,resultinginrefriger
-
antleakage.
• Be sure to wrap insulation around the piping. Direct contact with the bare
piping may result in burns or frostbite.
3-3.INSULATIONANDTAPING
1)Coverpipingjointswithpipecover.
2)Foroutdoorunitside,surelyinsulateeverypipingincludingvalves.
3)Usingpipingtape(E),applytapingstartingfromtheentryofoutdoorunit.
•Stoptheendofpipingtape(E)withtape(withadhesiveagentattached).
•Whenpipinghavetobearrangedthroughaboveceiling,closetorwhere
the temperature and humidity are high, wind additional commercially sold
insulationtopreventcondensation.
WARNING
When installing the unit, securely
connect the refrigerant pipes before
starting the compressor.
CAUTION
When there are the ports which are
not used, make sure their nuts are
tightened securely.
Fig. 1 Fig. 2 Fig.3
Fig. 4 Fig. 5 Fig. 6
TiltedUnevenBurred
Good
No good
Burr
Copper pipe
Spare reamer
Pipe cutter
Smooth all
around
Evenlength
all around
Inside is shin
-
ing without any
scratches.
Flare nut
Die
Copper pipe
Clutch type
Flaring tool
Wing nut type
Copper
pipe
Pipe diameter
[mm(inch)]
Nut
(mm)
A[mm(inch)] Tightening torque
Clutch type tool for R410A Clutch type tool for R22 Wing nut type tool for R22
N•m kgf•cm ft•Ib
ø6.35(1/4) 17
0 to 0.5
(0to0.02)
1.0 to 1.5
(0.04to0.06)
1.5 to 2.0
(0.06to0.08)
13.7to17.7 140 to 180 10to13
ø9.52(3/8)
22 34.3to41.2 350to420 25to30
ø12.7(1/2)
26
2.0 to 2.5
(0.08to1.0)
49.0 to 56.4 500 to 575 36to42
ø15.88(5/8)
29 73.5to78.4 750 to 800 54 to 58
3. FLARINGWORKANDPIPECONNECTION
3-1.FLARINGWORK
1)Cutthecopperpipecorrectlywithpipecutter.(Fig.1,2)
2)Completelyremoveallburrsfromthecutcrosssection
ofpipe.(Fig.3)
•Aimthecopperpipedownwardwhileremovingburrs
topreventburrsfromdroppinginthepipe.
3)Removearenutsattachedtoindoorandoutdoorunits,
thenputthemonpipehavingcompletedburrremoval.
(Notpossibletoputthemonafteraringwork.)
4)Flaringwork(Fig.4,5).Firmlyholdcopperpipeinthe
dimension shown in the table. Select A mm from the
table according to the tool selected.
5)Check
•ComparethearedworkwithFig.6.
•Ifareisnotedtobedefective,cutoffthearedsec
-
tionanddoaringworkagain.
4-1.PURGINGPROCEDURESANDLEAKTEST
4. PURGINGPROCEDURES,LEAKTEST,ANDTESTRUN
1)Removeserviceportcapofstopvalveonthesideoftheoutdoorunitgas
pipe.(Thestopvalvesarefullyclosedandcoveredincapsintheirinitial
state.)
2)Connectgaugemanifoldvalveandvacuumpumptoserviceportofstop
valveonthegaspipesideoftheoutdoorunit.
3)Runthevacuumpump.(Vacuumizeformorethan15minutes.)
4)Checkthevacuumwithgaugemanifoldvalve,thenclosegaugemanifold
valve,andstopthevacuumpump.
5)Leaveasitisforoneortwominutes.Makesurethepointerofgauge
manifoldvalveremainsinthesameposition.Conrmthatpressuregauge
shows
–
0.101MPa[Gauge](
–
760mmHg)(
–
30in.Hg).
6)Removegaugemanifoldvalvequicklyfromserviceportofstopvalve.
7)Fullyopenallstopvalvesonthegaspipeandtheliquidpipe.Operating
without fully opening lowers the performance and this causes trouble.
8)Referto1-2.,andchargetheprescribedamountofrefrigerantifneeded.
Be sure to charge slowly with liquid refrigerant. Otherwise, composition of
the refrigerant in the system may be changed and affect performance of
the air conditioner.
9)Tightencapofserviceporttoobtaintheinitialstatus.
10
)Leaktest
Serviceportcap
(Torque13.7to
17.7 N•m, 140 to
180kgf
•cm, 10 to
13
ft•lb)
Stopvalve
for GAS
Stopvalvecap
(Torque 19.6 to 29.4 N•m,
200to300kgf•cm,15to
22ft•lb)
Gauge manifold
valve(forR410A)
Compound pressure
gauge(forR410A)
–0.101MPa
[–760 mmHg
(–30in.Hg)]
Handle
Low
Handle High
Vacuumpump
(forR410A)
Charge hose
(forR410A)
*Close
*Open
Hexagonal wrench
*4 to 5 turns
Stopvalve
for LIQUID
Pressure gauge
(forR410A)
Precautions when using
thecontrolvalve
Whenattachingthecontrolvalveto
theserviceport,valvecoremayde-
form or loosen if excess pressure is
applied.Thismaycausegasleak.
Serviceport
Charge hose
(forR410A)
Body
Close
Open
Control
valve
A
Whenattachingthecontrolvalveto
theserviceport,makesurethatthe
valvecoreisinclosedposition,and
then tighten part A. Do not tighten
partAorturnthebodywhenvalve
core is in open position.
JG79A417H01_en.indd 5 10/12/2010 9:19:46 AM
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