Hisense HCHM-N04X - Page 21

T
wo wrenches required to prevent
damaging the copper piping.
Apply Refrigerant Oil.
● CautionsforPipingConnectionWork
(a) Connecttheindoor/outdoorconnecting
pipes.Securethepipesanddonottouch
otherobjects,suchasceilingsforexample.
(Otherwise,abnormalsoundmaybeheard
duetothevibrationofthepiping.)
(b) Applyrefrigerantoilslightlyonthesheet
surfaceofthepipeandflare nutbeforethe
flaring work.Thentightentheflare nutwith
thespecified tighteningtorqueusingtwo
wrenches.Alwaysuseaback-upwrenchto
preventtwistingofthecopperpipingwithin
theunitassembly.Performtheflaring work
ontheliquidpipingsidebeforethegas
pipingside.Checkthegasleakageafterthe
flaring work.
NOTE:
Refrigerantoilisfield-supplied
[EtherealOilFVC50K,FVC68D(Idemitsu
KousanCo.Ltd.)]
(c) Whentemperatureandhumidityinsidethe
ceilingexceed27
o
C(80
o
F)/RH,relative
humidity,80%,applyadditionalinsulation
approximately20mm(13/16inch)thickness
totheaccessoryinsulation.Itprevents
condensationonthesurfaceoftheinsulation
(refrigerantpipeonly)andpossibledamage
toelectroniccomponents.
(d) Performtheair-tightleakagetest4.15MPa
(601psi)forthetestpressure.Refertothe
TechnicalManualfortheOutdoorUnitfor
moredetails.
(e) Performcoldinsulationworkbyinsulating
andtapingtheflareconnectionandreducer
connection.Alsoinsulatealltherefrigerant
pipes.
● Do not apply excessive force to the are
nut when tightening. Excessive force can
result in the are nut cracking and refrigerant
leakage may occur. Use the specied
tightening torque.
● For more details of the refrigerant piping
work, vacuum pumping and refrigerant
charge, refer to the Technical Manual for the
Outdoor Unit.
RequiredTighteningTorque
PipeSize TighteningTorque
6.35mm (ɸ1/4inch) 14to18 N
●
m (10.3to13.3 ft
.
lbs)
9.52mm
(ɸ3/8inch) 34to42 N
●
m (25.1to31.0 ft
.
lbs)
12.7mm
(ɸ1/2inch) 49to61 N
●
m (36.1to45.0 ft
.
lbs)
15.88mm
(ɸ5/8inch) 68to82 N
●
m (50.2to60.5 ft
.
lbs)
19.05mm
(ɸ3/4inch) 100to120 N
●
m (73.8to88.5 ft
.
lbs)
12