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GENERAL STARTUP INSTRUCTIONS
Evacuation
To avoid inclusion of air or moisture in the refrigerant circuit, be
sure to execute vacuum drying of the entire circuit before charging
refrigerant by using a vacuum pump. Execute evacuation after
securely carrying out airtight/pressure testing.
> When performing vacuum drying, make sure that valve EC1
and EC3 are fully open, please refer to pages 26-27.
Refrigerant Charging
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Calculate the refrigerant charge prior to charging, the system design allows to a
maximum of 3,8L of refrigerant.
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Execute refrigerant charging immediately after evacuation.
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Charge refrigerant R744 (CO2 refrigerant).
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Do not mix with other refrigerant.
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Always use refrigerant grade CO2, moisture content must be below 10 ppm.
Method of Charging
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Use Manifold Gauges and charging hoses for CO2 only.
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Use only refrigeration quality CO2.
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Use a refrigerant scale to measure correct quantity charged into the system from the
CO2 cylinders.
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Close the vacuum pump and break the vacuum with vapor CO2 until 7-10Bar to
avoid dry ice formation. Dry ice may block hoses and pipes and charging will be
impossible. Charge vapor in both suction and liquid line. Control that the expansion
valve at the evaporator(s) is active. Control both electronic pressure transmitters and
manifold Gauges for correct pressure readings.
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As vapor is drawn from the CO2 cylinders, pressure and temperature inside the
cylinder will decrease. Frosting on the bottom exterior of the cylinder is evidence
that some CO2 liquid evaporated inside. The reduction in pressure also causes a
slower flow rate of vapor into the system. Once the flow from the cylinder has
slowed to a low level, the cold cylinder should be disconnected and allowed to
warm. After the cylinder warms, additional CO2 can be removed. In the meantime,
another warm tank can be connected to the system to continue the charging process.
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Add liquid CO2 only into the liquid line.
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Do not charge liquid on compressor suction line. Only Gas.
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Max CO2 charge is 3.8kg. Overfilling the system may cause malfunction and
compressor damage.
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Sight glass does not indicate correct CO2 level if 100% full. Control superheat
management is inside min-max superheat settings.
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Simulate transcritical conditions when charging in low ambient conditions by
blocking the air flow into the condenser/gas cooler in order to control correct
charging level.
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Run the unite and simulate thermostat cut off, defrosting cycle or manual pump
down in order to control correct operation and CO2 charge.
¾ level in the sight glass is ok.
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