ICU CONDENSING UNIT INSTALLATION MANUAL
September2003:E\Manuals\Others\Qualitair\ICC\0412118
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8. REFRIGERATION COMMISSIONING
Figure – 8.1 Evacuation and Charging Connections
8.1
Evacuation, Charging and Refrigerant Procedures
After completing the refrigerant connections the following steps should be followed with reference to
Figure 8.1 above.
1)
Service gauges - Connect the low pressure port (1) of a manifold gauge set to the suction line
outdoor unit shut off valve service port (2).
2)
Vacuum Pump - Connect the centre line port (3) of the manifold gauge set to the vacuum pump (4)
and operate the pump to ensure a vacuum of 200 microns.
Note: Ensure gauge low pressure port (5) is open and high pressure port (6) is closed.
3)
System Isolation - After achieving the specified system vacuum close the gauge low pressure port (5)
and switch off the vacuum pump. Leave the system for 1 hour and check that the vacuum is
maintained. If not, check for leaks, rectify and repeat the pumping down to 200 microns.
4)
Refrigerant Charging - Open both the outside unit shut off valves (7 & 8). Weigh in the appropriate
charge using a charging station.
5)
Disconnect the vacuum pump and connect the gauge high pressure port (9) to the discharge line of
the outdoor unit shut-off valve (10), ensuring that the gauge central port (3) is closed. Run the
system, allow pressures to stabilise and ensure correct operation. After final commissioning remove
the gauge set, fit all valve caps and carry out a final refrigerant leak test.
This being a stand-alone condensing unit, the match to the indoor unit and appropriate
charge are the responsibility of the installer.
