7.Air
Purgingof
theConnecting
Pipesand
theIndoor
Unit
33
Indoor unit
Liquid side
Outdoor unit
OPEN
CLOSE
Vaccum pump
Gas side
Closed
Closed
2-way v
alve/
3-way v
alve
3-wa
y
valv
e
Theair
whichcontains
moistureremaining
inthe
refrigerationcycle
maycause
amalfunction
onthe
compressor.
1.Confirm
thatboth
theliquid
sidevalve
andthe
gasside
valveare
setto
theclosed
position.
2.After
connectingthe
piping,check
thejoints
forgas
leakagewith
gasleak
detector.
3.Remove
theservice
portnut,
andconnect
thegauge
manifoldand
thevacuum
pumpto
the
serviceport
bythe
chargehose.
4.V
acuumthe
indoorunit
andthe
connectingpipes
untilthe
pressurein
themlowers
tobelow
-
76cmHg.
5.Remove
thevalve
stemnuts,
andfully
openthe
stemsof
the2-way
and3-way
valveswith
a
hexagonwrench.
6.T
ightenthe
valvestem
nutsof
the2-way
valveand
3-wayvalve.
7.Disconnect
thecharge
hoseand
fitthe
nutto
theservice
port.
(Tightening
torque:1.8kg.m)