Evacuation Procedures - Mitsubishi Electric SUH-1.6VR2 Technical & Service Manual

Remove the service port cap of the stop/ball valve.
(The stop/ball valve will not work in its initial state fresh out of the factory (totally closed with cap on).)
Connect the gauge manifold valve and the vacuum pump to the service port of the stop/ball valve .
Run the vacuum pump. (Vacuumize for more than 15 minutes.)
Check the vacuum with the gauge manifold valve, then close the gauge manifold valve, and stop the
vacuum pump.
Leave as it is for one or two minutes. Make sure the pointer of the gauge manifold valve remains in the
same position. Confirm that the pressure gauge show-0.1MPa(-79cmHg)
<SUH-1, 1.6, 2>
<SU-1, 1.6, 2, 2.5>
Open Close
Hexagonal
wrench
Stop valve
Gauge manifold valve
Connection
pipe
Remove the gauge manifold valve quickly from the service port of the stop/ball valve.
After refrigerant pipes are connected and evacuated, fully open all stop/ball
valves on gas and liquid pipe sides.
Operating without fully opening lowers the performance and causes trouble.

EVACUATION PROCEDURES

Connect the refrigerant pipes (both the liquid and gas
pipes) between the indoor and the outdoor units.
Liquid pipe
Stop valve
Hexagonal
wrench
Gas pipe
Caps
Stop valve
Service port
Vacuum pump
Pipe length :
7m maximum
No gas charge is
needed.
Tighten the cap to the service port to obtain the initial status.
<SUH-2.5>
Pipe length
exceeding 7m
Charge the prescribed
amount of gas.
Retighten the cap.
Leak test
27
Compound gauge Pressure gauge
-1.01 10 Pa
(-760mmHg)
Ball valve
(liquid side)
Valve knob Lo
Service port
Charge hose
Manifold
valve
Valve knob Hi
Vacuum
pump