icetro ISI-163TT, User Manual

Page: 32 / 40

32
Refrigerant circuit
Charging Refrigerant
L.P
H.P
N2
Vacuum
Pump
R404A
Scales
MANIFOLD
E.P.R
Service Port
1
2
3
Mi x ta nk
Capillary
Dryer
Su ction pipe
For keeping in
the refrigerator
Au to ma tic Expans ion Valve
Freezer
Co ndenser
Compressor
Fan
H. P S/W
Di scharge pipe
Th er mostat
Fi
lt
er
Dr
ye
r
Mote r
Th er mostat
Compersso r
For keeping
in the freeze
Suction pipe
①
Leak Test
When the refrigeration system is opened to repair or service the refrigerant system,
conduct leak test before vacuum work, at the expanded and welded tube joints .
1) Connect the manifold gauge to the low-pressure service port, and connect nitrogen
gas tank to the manifold gauge
2) When the manifold gauge indicates 300 PSIG, close the valve.
3) Perform leak test with the entire refrigerant system .
4) If there is no leakage, close the manifold and disconnect the nitrogen gas tank.
②
Vacuum
Remove the moisture and air from the refrigerant system before charging refrigerant .
1) Connect vacuum pump with the manifold gauge, and start the vacuum pump.
2) The vacuum time shall be at least 30 minutes and the manifold pressure shall be
maintained at 740~750mmHg.
3) When full vacuum state is reached, close the manifold gauge and disconnect the
vacuum pump.
③
Charging Refrigerant
1) Connect refrigerant container to the manifold .
2) Open the refrigerant container valve slightly and purge the air from the manifold hose.
3) Measure the gross weight of the refrigerant container using a balance.
4) Place the refrigerant container upside down, with the valve at the bottom. W ait until
the refrigerant stabilizes. Open the valve to charge the refrigerant .
5) When the refrigerant has been fully charged, disconnect the manifold .