Starting Up & Operation; Evacuation; Charging Procedure; Refrigerant Charging Procedure - Emerson Copeland Eazycool OMTE-90D-TFD Application Manuallines

4 Starting up & operation
Before commissioning, ensure that all valves on the condensing unit are fully opened. Only qualified
personal and certified companies are allowed to do installation, commissioning, service and
maintenance work.
4.1

Evacuation

CAUTION
System pressure below atmospheric pressure! Compressor damage!
Never energize the unit/controller without minimum refrigerant system charge.
There is a risk of malfunction of the controller in deep vacuum operation which
can cause compressor damage.
IMPORTANT
The evacuation procedure is based upon achieving an actual system vacuum
standard and is NOT TIME DEPENDENT! The installation has to be evacuated
with a vacuum pump before commissioning. Proper evacuation reduces
residual moisture to 50 ppm. The installation of adequately sized access valves
at the furthest point from the compressor in the suction and liquid lines is
advisable. The system must be evacuated down to less than 3 mbar. If required
break the vacuum with dry nitrogen. Pressure must be measured using a
vacuum pressure gauge on the access valves and not on the vacuum pump.
This serves to avoid incorrect measurements resulting from the pressure
gradient along the connecting lines to the pump.
IMPORTANT
Care must be taken that all components (solenoids, expansion devices,
regulators, shut off valves, etc...) in the refrigeration cycle, which separate a
part of the installation when de-energized, are manually opened to guarantee
successful evacuation in the whole piping system.
4.2

Charging procedure

4.2.1

Refrigerant charging procedure

IMPORTANT
Inadequate charge! Overheating! The Scroll compressor design requires
system charging as quickly as possible with liquid refrigerant into the liquid line.
This will avoid running the compressor under conditions whereby insufficient
suction gas is available to cool not only the motor but also the scrolls.
Temperature builds up very quickly in the scrolls if this is not done.
Service valve closed! Compressor damage! Do not charge the unit with
vapour (gas). The suction service valve must not be fully closed at any time
when the compressor is running. To do so would cause damage to the
compressor in the same manner as explained above. This valve is provided for
ease of connection and for the fitting of service gauges without removing the
unit panel.
Pre-charging must be done with liquid refrigerant through the service valve on the liquid line. It is
advisable to pre-fill the suction side with a partial charge to avoid vacuum operation. Further charging
can be carried out by carefully filling refrigerant through the suction line while simultaneously
checking the sight glass.
NOTE: In order to meet the requirements of the Ecodesign Directive 2009/125/EC with regard
to efficient system operation, ensure the refrigerant charge is sufficient.
32 C6.1.9/0219/E