Installation Guide

En-5
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 refrigerant
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 insula
-
tion
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.
B
Flare nut
Die
Copper
pipe
Clutch type
Flaring tool
Wing nut type
Copper
pipe
Pipe diameter
[inch (mm)]
B
[inch (mm)]
A [inch (mm)] Tightening torque
Clutch type tool for R410A Clutch type tool for R22 Wing nut type tool for R22 ft-Ib N•m kgf•cm
1
/4 (ø6.35) 21/32 (17)
0 to 0.02
(0 to 0.5)
0.04 to 0.06
(1.0 to 1.5)
0.06 to 0.08
(1.5 to 2.0)
10 to 13 13.7 to 17.7 140 to 180
3/8 (ø9.52) 7/8 (22) 25 to 30 34.3 to 41.2 350 to 420
1/2 (ø12.7) 1-1/32 (26)
0.08 to 1.0
(2.0 to 2.5)
36 to 42 49.0 to 56.4 500 to 575
5/8 (ø15.88) 1-5/32 (29) 54 to 58 73.5 to 78.4 750 to 800
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 inch (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 side of the outdoor unit gas pipe.
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-14.7psi
[Gauge] (-0.101 MPa).
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
Gauge manifold
valve
(for R410A)
Compound pressure
gauge (for R410A)
Handle High
Charge hose
(for R410A)
Pressure gauge
(for R410A)
-14.7 psi
(-0.101 MPa)
Handle Low
Vacuum pump
(for R410A)
Stopvalvecap
(Torque 15 to
20 ft-lb, 21.5 to
27.5 N•m, 220
to 280 kgf•cm)
*Close
*Open
Hexagonal wrench
*4 to 5 turns
Serviceportcap
(Torque 7 to 9 ft-lb,
10 to 12 N•m, 100
to 120 kgf•cm)
Stopvalvecap
(Torque 18 to
22 ft-lb, 24.4 to
30.4 N•m, 250
to 310 kgf•cm)
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.
BH79A088H01_en.indd 5 2014/08/05 13:34:48