22 Air Evacuation
7.
Air Evacuation
7.1.
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.
Vacuum the system should be performed upon initial installation and
when unit is relocated.
7.1.1.
Before performing Evacuation
•
Check to make sure that both high-pressure and low-pressure pipes
between the indoor and outdoor units are connected properly in
accordance with the Refrigerant Piping Connection section of this
manual.
•
Check to make sure all wiring is connected properly.
7.2.
Evacuation Instructions
Before using the manifold gauge and vacuum pump, read their operation
manuals to familiarise yourself with how to use them properly.
Figure
7-1
1
Connect the charge hose of the manifold gauge to service port on
the outdoor unit's low pressure valve.
2
Connect another charge hose from the manifold gauge to the
vacuum pump.
3
Open the Low Pressure side of the manifold gauge. Keep the High
Pressure side closed.
4
Turn on the vacuum pump to evacuate the system.
5
Run the vacuum for at least 15 minutes, or until the Compound
Meter reads -76cmHG (-105Pa). 1.5 Torr.
6
Close the Low Pressure side of the manifold gauge, and turn off the
vacuum pump.
7
Wait for 5 minutes, then check that there has been no change in
system pressure. Disconnect Vacuum Machine before opening
service valves.
Manifold Gauge
Pressure gauge
High pressure valve
Charge hose
Vacuum pump
Compound gauge
-76cmHg
Low pressure valve
Pressure hose /Charge hose
Low pressure valve
Bosch Climate 5000
6 720 866 139 (2016/07)
