Vacuum Pumping; Leakage Detection - Friedrich FSHSW36A3A Installation And Operation Manual

Vacuum pumping

Use vacuum pump
1. Remove the valve caps on
the liquid valve and gas
valve and the nut of refri-
gerant charging vent.
2. Connect the charging hose
0DQLIROG *DXJH to the refri-
gerant charging SRUW of gas
valve and then connect the
other charging hose to the
vacuum pump.
3. Open the 0DQLIROG *DXJH com-
pletely and operate for
10-15min to check if the
pressure of 0DQLIROG *DXJH re-
mains in -0.1MPa.
4. Close the vacuum pump
and maintain for 1-2min to
check if the pres-
sure of 0DQLIROG *DXJH remains
in -0.1MPa. If the pressure decreases, there may be leakage.
5. Remove the 0DQLIROG *DXJH, open the valve core of liquid valve and gas
valve completely with $OOHQ ZUHQFK
6. Tighten the screw caps of valves and refrigerant charging SRUW.
7. Reinstall the handle.

Leakage detection

1. With leakage detector:
Check if there is leakage with leakage detector.
2. With soap water:
If leakage detector is not available, please use soap water for leakage detection.
Apply soap water at the suspected position and keep the soap water for more
than 3min. ,I EXEEOHV DUH SUHVHQW DW IODUH MRLQWV UHWRUTXH IODUH QXWV
liquid valve
gas valve
refrigerant
charging SRUW
nut of refrigerant
charging SRUW

0DQLIROG *DXJH
Lo
valve cap
vacuum pump
$OOHQ ZUHQFK
close
open
Hi