Hitachi UTOPIA IVX STANDARD Series User Manual

Use two spanners here
for pipe connection
Do not work with two
spanners here.
Refrigerant leakage
shall occur
! CAUTION
• Atthetestrun,fullyopenthespindleandballstopvalve.
• Ifnotfullyopened,thedeviceswillbedamaged.
• Donotattempttoturnservicevalverodbeyonditsstop.
• Donotloosenthestopring.Ifthestopringisloosened,itisdangerous
sincethespindlewillhopout.
• Anexcessorashortageofrefrigerantisthemaincauseoftrouble
totheunits.Chargethecorrectrefrigerantquantityaccordingtothe
descriptionoflabelattheinsideofservicecover.
• Checkforrefrigerantleakageindetail.Ifalargerefrigerantleakage
occurs,itwillcausedifcultywithbreathingorharmfulgaseswould
occurifarewasbeingusedintheroom.
8.3 BRAZING WORK
! CAUTION
• Usenitrogengasforblowingduringpipebrazing.Ifoxygen,acetylene
oruorocarbongasisused,itwillcauseanexplosionorpoisonous
gas.
• A lot of oxidation lm will occur inside of tubes if no nitrogen gas
blowingis performed duringbrazingwork. This lmwill be ecked
offafteroperationandwillcirculateinthecycle,resultinginclogged
expansionvalves,etc.Thiswillcausebadinuencetothecompressor.
• Useareducervalvewhennitrogengasblowingisperformedduring
brazing.Thegaspressureshouldbemaintainedwithin0.03to0.05
MPa.Ifaexcessivelyhighpressureisappliedtoapipe,itwillcause
anexplosion.
8.4 REFRIGERANT CHARGE
! CAUTION
• Do not charge OXYGEN, ACETYLENE, or other ammable and
poisonousgasesintotherefrigerantbecauseanexplosioncanoccur.
Itisrecommended thatoxygenfree nitrogen bechargedfor these
typesoftestscyclewhenperformingaleakagetestoranairtighttest.
Thesetypesofgasesareextremelydangerous,
• Insulate the unions and are-nuts at the piping connection part
completely.
• Insulate the liquid piping completely to avoid a decrease of
performance;ifnot,itwillcausesweatingonthesurfaceofthepipe.
• Charge refrigerant correctly. Overcharging or insufcient charging
couldcauseacompressorfailure.
• Checkforrefrigerantleakageindetail.Ifalargerefrigerantleakage
occurred, it would cause difculty with breathing or harmful gases
wouldoccurifarewerebeingusedintheroom.
• Ifthearenutistigthenedtoohard,thearenutmaycrackaftera
longtimeandcauserefrigerantleakage.
8.5 CAUTION OF THE PRESSURE BY CHECK JOINT
When the pressure is measured, use the check joint of gas stop
valve (A), and use the check joint of liquid piping (B) in the gure
below.
At that time, connect the pressure gauge according to the
following table because of high pressure side and low pressure
side changes by operation mode.
Cooling
Operation
Heating
Operation
Check Joint for Gas Stop Valve “A” Low Pressure High Pressure
Check Joint for Piping “B” High Pressure Low Pressure
Check Joint for Liquid Stop Valve “C”
Exclussive for Vacuum Pump
and Refrigerant Charge
? NOTE
Becarefulthatrefrigerantandoildonotsplashtotheelectricalpartsat
removingthechargehoses.
C
B
A
There may be gas
trapped at the “O-ring
screw” part, which may
produce a sound when
released upon removal
of the cap.
However, this is not a
gas leakage.
REFRIGERANT PIPING & REFRIGERANT CHARGE
PMML0395B rev.0 - 11/2015
12

Hitachi UTOPIA IVX STANDARD Series Specifications

General

Brand	Hitachi
Model	UTOPIA IVX STANDARD Series
Category	Air Conditioner
Language	English