A SERVICE OF

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8
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.
ABCD
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
(MXZ-4A36NA)
Service port cap
(Torque 13.7 to
17.7 N•m, 140 to
180 kgf•cm, 10
to
13 ft•lb)
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 mm
Hg
(–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
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.
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mani
-
fold 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mmHg(–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
SG79Y871H02.indb 8 9/7/2007 1:09:42 PM