77
source valve
7st side 8nd side
hand
648RUa
Yhe refrigerant pipe should be clean4 Yhe nitrogen should flow under the pressure of about
648Rpa and when charging the nitrogen2 stop up the end of the pipe by hand to enhance the
pressure in the pipe2 then loose the hand .meanwhile stop up the other end/4
\hen weldingthe valve and the pipes2 use the wet cloth to cool down the valve and the
pipes4
\hen connectingthe pipes2 close the valves fully4
{s
-95>5;9 F9EF
74 Yhe outdoor unit has been executed the leakage test in the factory4 Ffter connecting the
distributingpipe2 execute the leakage test from the outdoor check valve and the indoor4
Gesides2 while testing2 the valves should be close4
84 Wefer to the below figure to charge the nitrogen into the unit to take a test4 Sever use the
chlorin2 oxygen2 flammable gas in the leakage test4 Fpply pressure both on the gas pipe and the
liquid pipe4
94 Fpply the pressure step by step to the target pressure4
a4 Fpply the pressure to 64;RUa for more than ; minutes2 confirm if pressure goes down4
b4 Fpply the pressure to 74;RUa for more than ; minutes2 confirm if pressure goes down4
c4 Fpply the pressure to the target pressure .:46RUa/2 record the temp4 and the pressure4
d4 Qeave it at :46RUa for over 7 day2 if pressure does not go down2 the test is passed4
Reanwhile2 when the temp4 changes for 7degree2 pressure will change 6467RUa as well4
Horrect the pressure4
e4 Ffter confirmation of a{d2 if pressure goes down2 there is leakage4 Hheck the brazing
position2 flared position by layingon the soap4 modify the leakage point and take another
leakage test4
:4 Ffter leakage test2 must execute the evacuation4
gauge manifold
Qo
Mi
Qo handle
Mi handle
nitrogen
to indoor
outdoor
gas pipe
check valve
gas pipe
check hole
Nnstallation procedure
Summary of Contents for MRVII-S AU282FHERA
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