HTW IX90S-R32C Manual De Usuario E Instalacion página 46

Installation of outdoor unit
Step 6: Neaten the pipes
1. The pipes should be placed along the wall, bent
reasonably and hidden possibly. Min.semidiameter of
bending the pipe is 10cm.
2. If the outdoor unit is higher than the wall hole, you
must set a U-shaped curve in the pipe before pipe
goes into the room, in order to prevent rain from
getting into the room.
Step 7: Vacuum pumping
Use vacuum pump
1. Remove the valve caps on the liquid valve
and gas valve and the nut of refrigerant
charging vent.
2. Connect the charging hose of piezometer
to the refrigerant charging vent of gas
valve and then connect the other charging
hose to the vacuum pump.
3. Open the piezometer completely and ope-
rate for 10-15min to check if the pressure
of piezometer remains in -0.1MPa.
4. Close the vacuum pump and maintain this
status for 1-2min to check if the pressure
of piezometer remains in -0.1MPa. If the
pressure decreases, there may be leakage.
5. Remove the piezometer, open the valve core of liquid valve and gas valve completely
with inner hexagon spanner.
6. Tighten the screw caps of valve and refrigerant charging vent.
7. Reinstall the handle.
Step 8: 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. If
there are air bubbles coming out of this position, there's a leakage.
liquid valve
gas valve
refrigerant
charging vent
nut of refrigerant
charging vent
44
U-shaped curve
drain hose
piezometer
Lo
valve cap
vacuum pump
inner hexagon
spanner
close
open
wall
Hi