Mitsubishi Electronics MXZ-2A20NA Air Conditioner User Manual


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7
4-1.PURGINGPROCEDURESANDLEAKTEST
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)
*Close
*Open
Hexagonal wrench
*4 to 5 turns
Stop valve
for LIQUID
4. PURGINGPROCEDURES,LEAKTEST,ANDTESTRUN
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.
4-2.GASCHARGE
Perform gas charge to unit.
1 Connectgascylindertotheserviceportofstopvalve.
2 Performairpurgeofthepipe(orhose)comingfromrefrigerantgas
cylinder.
3 Replenishspeciedamountoftherefrigerant,whileoperatingtheair
conditioner for cooling.
Note:
Incaseofaddingrefrigerant,complywiththequantityspeciedforthe
refrigeratingcycle.
CAUTION:
Whenchargingtherefrigerantsystemwithadditionalrefrigerant,besure
touseliquidrefrigerant.Addinggasrefrigerantmaychangethecomposi
-
tionoftherefrigerantinthesystemandaffectnormaloperationoftheair
conditioner.Also,chargethesystemslowly,otherwisethecompressor
will be locked.
Tomaintainthehighpressureofthegascylinder,warmthegascylinder
withwarmwater[under40°C(140°F)]duringcoldseason.Butneveruse
nakedreorsteam.
Union
Stop valve
Liquid pipe
Union
Union
Union
Indoor
unit
Stop valve with
service port
Gas pipe
Refrigerant gas
cylinder
operating valve
(forR410A)
Gauge manifold
valve(forR410A)
Chargehose(forR410A)
Refrigerantgascylinder
for R410A with siphon
Electronic scale for
refrigerant charging
Refrigerant(liquid)
Outdoor
unit
1)Removeserviceportcapofstopvalveonthesideoftheoutdoorunit
gas pipe. (The stop valve will not work in its initial state fresh out of
thefactory,totallyclosedwithcapon.)
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pointergaugemani
-
fold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)Afterrefrigerantpipesareconnectedandevacuated,fullyopenall
stop valves on both sides of gas pipe and liquid pipe. Operating with
-
outfullyopeninglowerstheperformanceandthiscausestrouble.
8)Referto1-4.,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af
-
fect 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)
Charge hose
(forR410A)
JG79A039H01_En.indd 7 5/9/2008 2:23:44 PM
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