Publicité
6 Air evacuation
6�1 Preparations and precautions
Air and foreign matter in the refrigerant
circuit can cause abnormal rises in
pressure, which can damage the air
conditioner, reduce its efficiency, and
cause injury. Use a vacuum pump
and manifold gauge to evacuate the
refrigerant circuit, removing any non-
condensable gas and moisture from the
system.
Evacuation should be performed upon
initial installation and when unit is
relocated.
6�1�1 Before performing evacuation
• Check to make sure the connective
pipes between the indoor and outdoor
units are connected properly.
• Check to make sure all wiring is
connected properly.
6�1�2 Evacuation instructions
Before using a manifold gauge and a
vacuum pump, read their operation
manuals to make sure you know how to
use them properly.
Manifold Gauge
Compound gauge
-76cmHg
Low pressure valve
Pressure hose/Charge
hose
Low pressure valve
1. Connect the manifold gauge's charge
hose to the service port on the outdoor
unit's low pressure valve.
Multi Split Type Air Conditioner / User Manual
2. Connect the manifold gauge's charge
3. Open the Low Pressure side of the
4. Turn on the vacuum pump to evacuate
5. Run the vacuum for at least 15
6. Close the manifold gauge's Low
7. Wait for 5 minutes, then check that
8. Insert hexagonal wrench into the
Pressure gauge
High pressure valve
Charge hose
Vacuum pump
hose from the to the vacuum pump.
manifold
gauge.
Pressure side closed.
the system.
minutes, or until the Compound Meter
reads -76cmHG (-1x105Pa).
Pressure valve and turn off the vacuum
pump.
there has been no change in system
pressure.
If there is no change in
system pressure, unscrew
C
the cap from the packed
valve (high pressure
valve). If there is a change
in system pressure, there
may be a gas leak.
packed valve (high pressure valve) and
open the valve by turning the wrench
1/4 counterclockwise. Listen for gas
to exit the system, then close the valve
after 5 seconds.
Flare nut
Flare nut
valve body
Valve body
valve stem
Valve stem
Keep
the
High
Cap
Cap
51 / EN
Publicité
